JP2007298971A - Method for manufacturing color filter, and color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a color filter by means of an ink jet system, wherein the color filter ensures color characteristics and luminance equivalent to or nearly equivalent to those of a color filter obtained by a spin coat method and having a pixel from which sufficient color characteristics can be obtained with the average film thickness. <P>SOLUTION: The method for manufacturing the color filter includes a step (A) of preparing an ink jet ink, which is for a specific color filter and includes a pigment, a pigment dispersant, a binder forming system and a solvent; a step (B) of forming each of an R ink layer, a G in layer and a B ink layer by an ink jet system; and a step (C) of forming an R pixel, a G pixel and a B pixel, which have an average film thickness within a range of 1.5-2.5 μm, a film thickness distribution within a range of 1.0-3.0 μm, and a rate of the total area of regions where the film thickness in one pixel is 1.5 μm or less but not less than 2.5 μm is 5% or less, by hardening the ink layers. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a color filter manufacturing method for forming pixels of a predetermined pattern on a substrate by an ink jet method, and a color filter having pixels of a predetermined pattern formed on a substrate.
More specifically, the present invention relates to a color filter formed by a spin coating method and having a pixel with an average film thickness capable of obtaining sufficient color characteristics, and a color filter having the same or similar color characteristics and brightness. The present invention relates to a method for producing a color filter by an ink jet method, and a color filter.

  Examples of the color filter include a color filter used for an image output device such as a liquid crystal display device, a color filter used for an image input device such as a solid-state imaging device, and the like. As an example, a typical example of a color filter structure used in a liquid crystal display device will be described with reference to FIG.

  In general, as shown in FIG. 1A, a color liquid crystal display device (101) is provided with a gap portion 3 of about 1 to 10 μm with a color filter 1 and an electrode substrate 2 such as a TFT substrate facing each other. 3 is filled with a liquid crystal compound L, and the periphery thereof is sealed with a sealing material 4. The color filter 1 is formed on a transparent substrate 5 with a black matrix (hereinafter sometimes referred to as BM) layer 6 formed in a predetermined pattern in order to shield the boundary between pixels and each pixel. A plurality of colors (usually, three primary colors of R (red), G (green), and B (blue)) arranged in a predetermined order, a protective film 8, and a transparent electrode film 9, It has a structure in which layers are stacked in this order from the side close to the transparent substrate. An alignment film 10 is provided on the inner surface side of the color filter 1 and the electrode substrate 2 facing the color filter 1. Furthermore, a spacer is provided in the gap portion 3 in order to maintain a constant and uniform cell gap between the color filter 1 and the electrode substrate 2. As the spacer, pearls 11 having a fixed particle diameter are dispersed, or columnar spacers 12 having a height corresponding to the cell gap as shown in FIG. It forms in the area | region which overlaps with the position in which the layer 6 is formed. A color image is obtained by controlling the light transmittance of each of the pixels colored in each color or the liquid crystal layer behind the color filter.

  As a conventional method for forming pixels of a color filter or the like with a predetermined pattern shape, for example, a staining method can be mentioned. In this dyeing method, first, a water-soluble polymer material, which is a dyeing material, is formed on a glass substrate, patterned into a desired shape by a photolithography process, and then the obtained pattern is immersed in a dyeing bath. To get a colored pattern. By repeating this three times, R, G, and B pixels are formed. Another method is a pigment dispersion method. In this method, first, a coating liquid (pigment dispersion) containing a pigment as a colorant and an alkali-soluble photocurable resin is applied onto a substrate to form a photosensitive resin layer. By patterning this into a desired shape by a photolithography process, a monochromatic pattern is obtained. Further, by repeating this process three times, R, G, and B pixels are formed. Still other methods include an electrodeposition method, a printing method in which a pigment is dispersed in a thermosetting resin, R, G, and B are printed three times, and then the resin is thermoset.

However, in any method, in order to color three colors of R, G, and B, it is necessary to repeat the same process three times, which causes a problem of high cost, and the yield decreases because the same process is repeated. There is a problem of doing.
As a method of manufacturing a color filter that solves these problems, Patent Document 1 proposes a method of forming pixels by spraying ink onto a substrate surface by an ink jet method.

  When pixels are formed by the inkjet method in the area surrounded by the black matrix layer on the transparent substrate, the relationship between the affinity between the ink and the surface of the black matrix layer, the height of the black matrix layer, the amount of ink ejected, etc. Thus, the shape of the pixel in the opening surrounded by the black matrix layer has a portion with a small thickness along the outer edge of the pixel or in the vicinity thereof, and the thickness is closer to the center of the pixel than the portion with the small thickness. Or a portion having a large thickness along the outer edge of the pixel or in the vicinity thereof, and having a minimum thickness closer to the center of the pixel than the thick portion. It is easy to form non-uniform pixels, such as having a shape having a portion, and having a rugged surface.

JP 59-75205 A

A pixel having a non-uniform shape, such as a pixel formed by an inkjet method, is compared with a flat pixel having the same average film thickness and the same material composition ratio, for example, a pixel formed by a spin coating method. The brightness tends to decrease. Therefore, when forming a pixel by an inkjet method, a pixel having a uniform shape as much as possible is required.
Although it is possible to improve the luminance by reducing the average film thickness of the pixel, changing the blending ratio of the material in the pixel, or changing the material, such a method can be obtained by a spin coating method or the like. It is difficult to realize a color filter having a color characteristic equivalent to or close to that of a color filter having flat pixels.

The present invention has been accomplished in view of the above circumstances, and a color filter having a flat pixel, which is formed by a spin coating method, and having a color characteristic and brightness similar to or equivalent to those of a flat pixel is formed by an ink jet method. An object of the present invention is to provide a method for producing a color filter.
It is another object of the present invention to provide a color filter having a color characteristic and luminance that are equal to or similar to those of a color filter having flat pixels formed by a spin coating method.

  The method for producing a color filter according to the present invention includes a pigment, a pigment dispersant, a binder forming system, and a solvent, and the solvent has a boiling point of 180 ° C. to 260 ° C. as a main solvent and a vapor pressure at room temperature of 0. A solvent component of 5 mmHg or less is contained in a proportion of 60% by weight or more with respect to the total amount of the solvent, and the ratio of the weight of the pigment to the sum of the weight of the pigment dispersant and the binder forming system (P / V ratio) is R pixel. 0.5 to 1.0 when forming the G pixel, 0.5 to 1.2 when forming the G pixel, and 0.3 to 0.5 when forming the B pixel. A step (A) of preparing an inkjet ink for a color filter having a solid content concentration of 15% by weight to 25% by weight with respect to the weight, and an R pixel forming ink obtained in the step (A) by an inkjet method, a G pixel Forming ink and B pixel formation A step (B) of forming an R ink layer, a G ink layer, and a B ink layer by selectively adhering ink to a predetermined region on the transparent substrate, and curing each ink layer to obtain an average film thickness Is in the range of 1.5 μm to 2.5 μm, the film thickness distribution is in the range of 1.0 μm to 3.0 μm, and the total area of the regions in which the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more And a step (C) of forming R pixels, G pixels, and B pixels each having a ratio of 5% or less.

According to the manufacturing method of the color filter, the same average film thickness formed by using the spin coating method, the same material composition ratio, and the same or similar color compared to the color filter having flat pixels. A color filter having characteristics and brightness can be manufactured. In addition, since the inkjet method is used, productivity is high, and cost reduction and yield improvement can be realized.
Further, in the method for producing a color filter according to the present invention, the inclusion of a polyethylimine derivative or a polyallylamine derivative in the pigment dispersant can suppress a drop during BM in a cross-sectional shape of a color filter pixel. preferable.

Moreover, in the method for manufacturing a color filter according to the present invention, it is preferable that each pixel has a film thickness distribution in the range of 1.5 μm to 2.5 μm, particularly from the viewpoint of suppressing the decrease in luminance. .
In addition, the method for producing a color filter according to the present invention has a black matrix layer having a height of 2.0 μm to 3.0 μm on the transparent substrate, thereby obtaining a pixel having a shape unique to the present invention. Is preferable from the viewpoint of easy.
In the method for producing a color filter according to the present invention, it is preferable that the inkjet ink for a color filter contains a leveling agent from the viewpoint of reducing the end bulge when a film is formed. The leveling agent is usually added after the pigment dispersion step.

The color filter according to the present invention includes at least a transparent substrate and pixels containing a pigment, a pigment dispersant, and a binder formed on the transparent substrate, and each pixel has an average film thickness of 1. 5 μm to 2.5 μm, the film thickness distribution is in the range of 1.0 μm to 3.0 μm, and the total ratio of the area of the region where the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more is 5 % Or less.
Even when using a manufacturing method such as an inkjet method that tends to make the pixel shape non-uniform due to restrictions on the method, such a color filter has a flat pixel shape with the same average film thickness and the same material composition ratio. Compared with a color filter having

In the color filter of the present invention, it is preferable that each pixel has a film thickness distribution in the range of 1.5 μm to 2.5 μm, particularly from the viewpoint of suppressing the above-described decrease in luminance.
Further, the color filter of the present invention has a black matrix layer having a height of 2.0 μm to 3.0 μm on the transparent substrate, which makes it easy to obtain a pixel having a shape unique to the present invention. To preferred.
In the color filter of the present invention, the pixel may contain a leveling agent. Such a color filter is preferable from the viewpoint that the edge bulge of the pixel is reduced.

According to the color filter manufacturing method of the present invention, it is possible to form a color filter having pixels with high flatness even though it is an inkjet method, and the obtained color filter has the same average film thickness and material configuration. In comparison, it has sufficient luminance as compared with a color filter having pixels formed by a spin coating method.
In addition, the color filter according to the present invention is equivalent to a color filter having pixels having a flat shape with the same average film thickness and material composition ratio even though the pixels have non-uniform shapes. Or it has sufficient brightness and color characteristics that are close to or equivalent to each other. Conventionally, the manufacturing method of a pixel has been severely restricted in order to form a pixel with high flatness, but the color filter according to the present invention has a very high degree of freedom in selecting a manufacturing method.

  The method for producing a color filter according to the present invention includes a pigment, a pigment dispersant, a binder forming system, and a solvent, and the solvent has a boiling point of 180 ° C. to 260 ° C. as a main solvent and a vapor pressure at room temperature of 0. A solvent component of 5 mmHg or less is contained in a proportion of 60% by weight or more with respect to the total amount of the solvent, and the ratio of the weight of the pigment to the sum of the weight of the pigment dispersant and the binder forming system (P / V ratio) is R pixel. 0.5 to 1.0 when forming the G pixel, 0.5 to 1.2 when forming the G pixel, and 0.3 to 0.5 when forming the B pixel. A step (A) of preparing an inkjet ink for a color filter having a solid content concentration of 15% by weight to 25% by weight with respect to the weight, and an R pixel forming ink obtained in the step (A) by an inkjet method, a G pixel Forming ink and B pixel formation A step (B) of forming an R ink layer, a G ink layer, and a B ink layer by selectively adhering ink to a predetermined region on the transparent substrate, and curing each ink layer to obtain an average film thickness Is in the range of 1.5 μm to 2.5 μm, the film thickness distribution is in the range of 1.0 μm to 3.0 μm, and the total area of the regions in which the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more And a step (C) of forming R pixels, G pixels, and B pixels each having a ratio of 5% or less.

  According to the manufacturing method of the color filter, the same average film thickness formed by using the spin coating method, the same material composition ratio, and the same or similar color compared to the color filter having flat pixels. A color filter having characteristics and brightness can be manufactured. In addition, since the inkjet method is used, productivity is high, and cost reduction and yield improvement can be realized.

1. Step of preparing ink-jet ink (A)
Hereinafter, the step (A) of preparing the inkjet ink in the method for producing a color filter according to the present invention will be described.
The ink-jet ink used in the present invention contains a pigment, a pigment dispersant, a binder forming system, a solvent, and, if necessary, a surfactant.

(Pigment)
As the colorant in the ink-jet ink used in the present invention, any one of known organic colorants and inorganic colorants can be selected and used. As the organic colorant, for example, dyes, organic pigments, natural pigments, and the like can be used. Moreover, as an inorganic coloring agent, an inorganic pigment, an extender pigment, etc. can be used, for example. Among these, organic pigments are preferably used because they have high color developability and high heat resistance. As organic pigments, for example, compounds classified as Pigments in the Color Index (CI; published by The Society of Dyers and Colorists), specifically, the following Color Index (CI) numbers are attached. You can list what you have.

  CI Pigment Yellow 1, CI Pigment Yellow 3, CI Pigment Yellow 12, CI Pigment Yellow 13, CI Pigment Yellow 14, CI Pigment Yellow 15, CI Pigment Yellow 16, CI Pigment Yellow 17, CI Pigment Yellow 20, CI Pigment Yellow 24, CI Pigment Yellow 31, CI Pigment Yellow 55, CI Pigment Yellow 60, CI Pigment Yellow 61, CI Pigment Yellow 65, CI Pigment Yellow 71, CI Pigment Yellow 73, CI Pigment Yellow 74, CI Pigment Yellow 81, CI Pigment Yellow 83, CI Pigment Yellow 93, CI Pigment Yellow 95, CI Pigment Yellow 97, CI Pigment Yellow 98, CI Pigment Yellow 100, CI CI Pigment Yellow 101, CI Pigment Yellow 104, CI Pigment Yellow 106, CI Pigment Yellow 108, CI Pigment Yellow 109, CI Pigment Yellow 110, CI Pigment Yellow 113, CI Pigment Yellow 114, CI Pigment Yellow 116, CI Pigment Yellow 117, CI Pigment Yellow 119, CI Pigment Yellow 120, CI Pigment Yellow 126, CI Pigment Yellow 127, CI Pigment Yellow 128, CI Pigment Yellow 129, CI Pigment Yellow 138, CI Pigment Yellow 139, CI Pigment Yellow 150, CI Pigment Yellow 151, CI Pigment Yellow 152, CI Pigment Yellow 153, CI Pigment Yellow 154, CI Pigment .... DOO Yellow 155, C.I Pigment Yellow 156, C.I Pigment Yellow 166, C.I Pigment Yellow 168, C.I Pigment Yellow 175;

  CI Pigment Orange 1, CI Pigment Orange 5, CI Pigment Orange 13, CI Pigment Orange 14, CI Pigment Orange 16, CI Pigment Orange 17, CI Pigment Orange 24, CI Pigment Orange 34, CI Pigment Orange 36, CI Pigment Orange 38, CI Pigment Orange 40, CI Pigment Orange 43, CI Pigment Orange 46, CI Pigment Orange 49, CI Pigment Orange 51, CI Pigment Orange 61, CI Pigment Orange 63, CI Pigment Orange 64, CI Pigment Orange 71, CI Pigment Orange 73; CI Pigment Violet 1, CI Pigment Violet 19, CI Pigment Violet 23, CI Pigment Violet 29, CI Pigment Buy Olet 32, C.I. pigment violet 36, C.I. pigment violet 38;

  CI Pigment Red 1, CI Pigment Red 2, CI Pigment Red 3, CI Pigment Red 4, CI Pigment Red 5, CI Pigment Red 6, CI Pigment Red 7, CI Pigment Red 8, CI Pigment Red 9, CI Pigment Red 10, CI Pigment Red 11, CI Pigment Red 12, CI Pigment Red 14, CI Pigment Red 15, CI Pigment Red 16, CI Pigment Red 17, CI Pigment Red 18, CI Pigment Red 19, CI Pigment Red 21, CI Pigment Red 22, CI Pigment Red 23, CI Pigment Red 30, CI Pigment Red 31, CI Pigment Red 32, CI Pigment Red 37, CI Pigment Red 38, CI Pigment Red 40, CI Pigment Red 41, CI Pigment Red 42, CI Pigment Red 48: 1, CI Pigment Red 48: 2, CI Pigment Red 48: 3, CI Pigment Red 48: 4, CI Pigment Red 49: 1, CI Pigment Red 49: 2, CI CI Pigment Red 50: 1, CI Pigment Red 52: 1, CI Pigment Red 53: 1, CI Pigment Red 57, CI Pigment Red 57: 1, CI Pigment Red 57: 2, CI Pigment Red 58: 2, CI Pigment Red 58 : 4, CI Pigment Red 60: 1, CI Pigment Red 63: 1, CI Pigment Red 63: 2, CI Pigment Red 64: 1, CI Pigment Red 81: 1, CI Pigment Red 83, CI Pigment Red 88, CI Pigment Red 90: 1, CI pigmentless 97, CI Pigment Red 101, CI Pigment Red 102, CI Pigment Red 104, CI Pigment Red 105, CI Pigment Red 106, CI Pigment Red 108, CI Pigment Red 112, CI Pigment Red 113, CI Pigment Red 114, CI Pigment Red 122, CI Pigment Red 123, CI Pigment Red 144, CI Pigment Red 146, CI Pigment Red 149, CI Pigment Red 150, CI Pigment Red 151, CI Pigment Red 166, CI Pigment Red 168, CI Pigment Red 170, CI Pigment Red 171, CI Pigment Red 172, CI Pigment Red 174, CI Pigment Red 175, CI Pigment Red 176, CI Pigment Red 77, CI Pigment Red 178, CI Pigment Red 179, CI Pigment Red 180, CI Pigment Red 185, CI Pigment Red 187, CI Pigment Red 188, CI Pigment Red 190, CI Pigment Red 193, CI Pigment Red 194, CI Pigment Red 202, CI Pigment Red 206, CI Pigment Red 207, CI Pigment Red 208, CI Pigment Red 209, CI Pigment Red 215, CI Pigment Red 216, CI Pigment Red 220, CI Pigment Red 224, CI Pigment Red 226, CI Pigment Red 242, CI Pigment Red 243, CI Pigment Red 245, CI Pigment Red 254, CI Pigment Red 255, CI Pigment Red . 64, C.I Pigment Red 265;

  CI Pigment Blue 15, CI Pigment Blue 15: 3, CI Pigment Blue 15: 4, CI Pigment Blue 15: 6, CI Pigment Blue 60; CI Pigment Green 7, CI Pigment Green 36; CI Pigment Brown 23, CI Pigment Brown 25 CI pigment black 1, pigment black 7.

Specific examples of the inorganic pigment or extender pigment include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red rose (red iron (III) oxide), cadmium red, amber, etc. Can be mentioned. In the present invention, other pigments can be used alone or in admixture of two or more.
In the inkjet ink used in the present invention, the pigment is usually blended in a proportion of 1 to 60% by weight, preferably 15 to 40% by weight, based on the total solid content of the inkjet ink.

(Pigment dispersant)
The pigment dispersant is blended in the inkjet ink in order to disperse the pigment satisfactorily. Examples of the pigment dispersant that can be used include cationic, anionic, nonionic, amphoteric, and silicone surfactants. Further, a dispersion auxiliary resin such as a special acrylic polymer may be further used. In the production method of the present invention, the inclusion of a polyethylimine derivative or a polyallylamine derivative in the pigment dispersant tends to narrow the range of the film thickness distribution of the ink layer deposited and cured by the ink jet method. It is preferable from the point.
Here, the polyethylimine derivative includes 6-hydroxyhexanoic acid, ricinoleic acid, 12-hydroxystearic acid, 12-hydroxydodecanoic acid, 5-hydroxydodecanoic acid, 5-hydroxydecanoic acid and 4-hydroxydecanoic acid. Having a plurality of poly (carbonylalkyleneoxy) chains each containing a plurality of repeating units derivable from at least one other hydroxycarboxylic acid selected and derived from 6-hydroxyhexanoic acid A dispersing agent comprising a polyethyleneimine group in which the weight ratio of the unit to the unit derivable from other hydroxycarboxylic acid (s) is in the range of 90:10 to 10:90, or a salt thereof. is there.
Preferably, the weight ratio of units derivable from 6-hydroxyhexanoic acid to units derivable from other hydroxycarboxylic acid (s) is in the range of 20:80 to 80:20, in particular It is in the range of 20:80 to 50:50.

The polyethyleneimine (hereinafter referred to as “PEI”) group may be branched or straight chain and typically has a weight of at least 500, preferably at least 1,000, in particular at least 10,000. It has an average molecular weight. The average molecular weight is preferably less than 600,000, more preferably less than 200,000, in particular less than 50,000.
The poly (carbonylalkyleneoxy) chain (hereinafter referred to as “PCAO chain” in the present specification) is a polyester chain that can be derived by polymerization of the hydroxycarboxylic acid (or the corresponding lactone if appropriate). The chain blocks a plurality of carbonylalkyleneoxy (hereinafter referred to as “CAO”) repeat units that may be derived from 6-hydroxyhexanoic acid and at least one of the other hydroxycarboxylic acids described above. Or it is a copolyester chain included in random arrangement. PCAO chains typically contain, on average, 2 to 100, preferably 3 to 40, more preferably 4 to 15 of the above CAO groups, and a chain-stopping terminal group, For example, it may have an oxy terminus such as an optionally substituted alkylcarbonyl, in particular an alkylcarbonyl group containing 12 or more carbon atoms.

The PCAO chain may be attached to the PEI group by a covalent amide and / or ionic salt bond formed between the PEI group and the hydroxycarboxylic acid of the PCAO chain. The acid will be referred to as PCAO acid hereinafter. Such an amide bond may be formed by reaction of a terminal carboxylate group of PCAO acid with a primary or secondary amino group in PEI, while a salt bond is formed with a terminal carboxylate group of PCAO acid. It forms between the positively charged nitrogen atoms of the substituted ammonium groups in PEI.
The weight ratio of PCAO chain to PEI groups is typically 2: 1 to 30: 1, preferably 3: 1 to 20: 1, more preferably 8: 1 to 20: 1, and especially 10: 1. To 15: 1.

Polyethylimine derivatives are in the form of polyamines in which the nitrogen atom in the PEI group that is not bound to the PCAO chain is present as a free amino group, or the nitrogen atom can be derived from organic and / or inorganic acids It may be in the form of a salt that exists as a substituted ammonium group associated with a counter ion, or an intermediate form that contains a free amino group and a substituted ammonium group.
Polyethylimine derivatives can be prepared by reacting PEI with PCAO acid (s) or precursors thereof.

  In addition, the polyallylamine derivative means that the amino group of the polyallylamine side chain is modified with any of polyester, polyamide, and a co-condensate of polyester and polyamide (polyesteramide), so that the resin to which the pigment is to be dispersed is used. It is a polyallylamine derivative represented by the following general formula (I) having a wide compatibility range and excellent pigment dispersibility.

(Wherein X and Y are each independently hydrogen, a polymerization initiator residue or a chain transfer catalyst residue, R ¹ is a free amino group, represented by the following general formula (II) or (III) Wherein n represents an integer of 2 to 1,000, provided that at least one of n R ^{1 s} represents a group represented by formula (III).

In the formula, R ² represents a residue obtained by removing a carboxyl group from any of a polyester having a free carboxylic acid, a polyamide having a free carboxylic acid, or a polyester amide having a free carboxylic acid. )

  The polyallylamine derivative of the present invention is, for example, one or more compounds selected from the three compounds of polyallylamine and polyester having a free carboxyl group, polyamide, or a co-condensate of ester and amide (polyesteramide). It is obtained by reacting.

  This polyallylamine derivative is, for example, a polyallylamine having a polymerization degree of 2 to 1,000, a polyester having a free carboxyl group, represented by the following general formula (IV) or (V), and the following general formula (VI) or One kind of polyamide represented by (VII) can be prepared as a raw material alone or in combination of two or more kinds.

（式中Ｒ^３は、炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基を、そしてａは２〜１００の整数を示す。）

(Wherein R ³ represents a linear or branched alkylene group having 2 to 20 carbon atoms, and a represents an integer of 2 to 100.)

（式中Ｒ^４は、炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基、Ｃ₆Ｈ₄またはＣＨ＝ＣＨを、Ｒ^５は炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基、ポリアルキレングリコールから２つの水酸基を除いた残基を、そしてｂは２〜１００の整数を示す。また、前記鎖中にエーテル結合を有することもある。）

(Wherein R ⁴ is a linear or branched alkylene group having 2 to 20 carbon atoms, C ₆ H ₄ or CH═CH, and R ⁵ is a linear or branched alkylene group having 2 to 20 carbon atoms. A group, a residue obtained by removing two hydroxyl groups from polyalkylene glycol, and b represents an integer of 2 to 100. The chain may also have an ether bond.)

（式中Ｒ^６は、炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基を、そしてｃは２〜１００の整数を示す。）

(In the formula, R ⁶ represents a linear or branched alkylene group having 2 to 20 carbon atoms, and c represents an integer of 2 to 100.)

（式中Ｒ^４は、炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基、Ｃ₆Ｈ₄またはＣＨ＝ＣＨを、Ｒ^７は炭素原子数２〜２０の直鎖状もしくは分岐のアルキレン基を、そしてｄは２〜１００の整数を示す。）

(Wherein R ⁴ is a linear or branched alkylene group having 2 to 20 carbon atoms, C ₆ H ₄ or CH═CH, and R ⁷ is a linear or branched alkylene group having 2 to 20 carbon atoms. A group, and d represents an integer of 2 to 100.)

  In addition, the polyallylamine derivative suitably used as a pigment dispersant in the present invention is a polyester in which repeating components of general formula (IV) and general formula (V) are randomly polymerized to polyallylamine, general formula (VI) and general A polyamide in which the repeating component of the formula (VII) is randomly polymerized, and further a polyesteramide in which the repeating components of the general formula (IV) and / or (V) and the general formula (VI) and / or (VII) are randomly polymerized. It can also be produced by reacting.

  As the above-mentioned pigment dispersant, commercially available products such as Azisper Pb821 (manufactured by Ajinomoto Fine Techno Co., Ltd.) and Solsperse 33000 (manufactured by Avecia) as the polyethyleneimine derivative can be used.

In addition to the above polyethylimine derivatives and polyallylamine derivatives, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether; polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl Polyoxyethylene alkyl phenyl ethers such as ethers; Polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; Sorbitan fatty acid esters; Fatty acid-modified polyesters; Polymer surfactants such as tertiary amine-modified polyurethanes Can be used.
The content of the pigment dispersant is preferably 5 to 50% by weight based on the entire solid content, and more preferably 10 to 30% by weight based on the entire solid content.
It is preferable that the glass transition temperature (Tg) of the pigment dispersant is 200 ° C. or lower, preferably 150 ° C. or lower, from the viewpoint of further suppressing BM drop in the cross-sectional shape of the pixel of the color filter. The glass transition temperature here is based on differential scanning calorimetry (DSC). For example, it can be measured using a thermochemical reaction calorimeter (manufactured by Seiko Instruments Inc.) under conditions of a temperature range of 25 to 280 ° C. and a heating rate of 7.5 ° C./min.

(Binder forming system)
The inkjet ink used in the present invention contains a binder forming system in order to impart film formability and adhesion to the surface to be coated. In the present invention, the binder forming system is a liquid mixture that is contained in the ink and is included for attaching and fixing the pixels at a predetermined position. In addition to the curable compound having reactivity in the subsequent curing process, It includes compounds that are not themselves reactive.

  Since the ink used in the present invention is an ink used in an ink jet system, in order to form a predetermined pattern, it can be formed by selectively adhering the ink only to a predetermined pattern formation region and solidifying it, It is not necessary to form a pattern by performing exposure and development. Therefore, as the binder forming system, it is not always necessary to use a photocurable binder forming system capable of exposure and development, and a non-curable thermoplastic resin composition may be used, but a binder containing a curable resin. It is preferable to use a forming system in order to impart sufficient hardness to the cured film.

  Examples of the curable binder forming system include a thermosetting binder forming system including a thermosetting resin that can be polymerized and cured by heating, and a photocurable resin that can be polymerized and cured by visible light, ultraviolet light, electron beam, and the like. A photocurable binder-forming system containing a resin, and further one containing both a thermosetting binder and a photocurable binder can be used. In the ink-jet ink according to the present invention, even when the P / V ratio is increased, the binder forming system is a heat treatment because it makes the film physical properties of the pixel such as solvent resistance, adhesion, and ITO resistance better. A curable binder forming system is preferred. In addition, ITO tolerance here is tolerance with respect to the malfunction at the time of ITO circuit formation or alignment film formation, and specifically, the heat resistance in 230-250 degreeC after ITO circuit formation is mentioned. In addition, when a thermosetting binder is used, there is an advantage that a special incidental equipment such as a light irradiation device is not necessary and productivity is high.

(1) Thermosetting binder forming system As the thermosetting binder forming system, a combination of a compound having two or more thermosetting functional groups in one molecule and a curing agent is usually used, and further the thermosetting reaction is accelerated. A possible catalyst may be added. An epoxy group is preferably used as the thermosetting functional group. Further, these may further contain a polymer which is not polymerized by itself.

  As a compound having two or more thermosetting functional groups in one molecule, from the viewpoint of film ejection properties of ink jet and film physical properties such as solvent resistance, adhesion and ITO resistance of pixels formed by the ink jet ink, 1 Epoxy compounds having two or more epoxy groups in the molecule are preferably used. An epoxy compound having two or more epoxy groups in one molecule is an epoxy compound having two or more, preferably 2 to 50, more preferably 2 to 20 epoxy groups in one molecule (referred to as an epoxy resin). Is included). The epoxy group should just be a structure which has an oxirane ring structure, for example, can show a glycidyl group, an oxyethylene group, an epoxycyclohexyl group, etc. Examples of the epoxy compound include known polyvalent epoxy compounds that can be cured by carboxylic acid. Examples of such an epoxy compound include “Epoxy resin handbook” edited by Masaki Shinbo, published by Nikkan Kogyo Shimbun (Showa 62). These can be used widely.

  As an epoxy compound, in order to impart solvent resistance and heat resistance to the cured film, to increase the crosslink density of the polymer with a relatively high molecular weight and the cured film, or to improve the inkjet ejection performance by lowering the viscosity In addition, it is preferable to use a compound having a relatively low molecular weight in combination.

i) A compound having two or more thermosetting functional groups in one molecule. An epoxy compound which is a polymer having a relatively high molecular weight, which is usually used as a binder-forming component (hereinafter sometimes referred to as “binder epoxy compound”). As the polymer, a polymer composed of at least a structural unit represented by the following formula (1) and a structural unit represented by the following formula (2) and having two or more glycidyl groups can be used.

（式（１）において、Ｒ¹は水素原子または炭素数１〜３のアルキル基であり、Ｒ²は炭素数１〜１２の炭化水素基である。）

(In formula (1), R ¹ is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, R ² is a hydrocarbon group having 1 to 12 carbon atoms.)

（式（２）において、Ｒ³は水素原子又は炭素数１〜１０のアルキル基である。）
式（１）で表される構成単位は、下記式（３）で表されるモノマーから誘導される。

(In formula (2), R ³ is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.)
The structural unit represented by the formula (1) is derived from a monomer represented by the following formula (3).

（式（３）において、Ｒ¹およびＲ²は式（１）と同じである。）

(In Formula (3), R ¹ and R ² are the same as in Formula (1).)

By using the monomer represented by the formula (3) as a constituent unit of the binder epoxy compound, sufficient hardness and transparency can be imparted to the cured coating film formed from the inkjet ink of the present invention. In the formula (3), R ² is a hydrocarbon group having 1 to 12 carbon atoms, and may be any of a linear aliphatic, alicyclic, and aromatic hydrocarbon group, and an additional structure, For example, it may contain a double bond, a side chain of a hydrocarbon group, a side chain of a spiro ring, an intra-ring bridged hydrocarbon group, or the like.

  Specific examples of the monomer represented by the formula (3) include methyl (meth) acrylate, ethyl (meth) acrylate, i-propyl (meth) acrylate, n-propyl (meth) acrylate, and i-butyl (meth). Acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate, Examples thereof include para-t-butylcyclohexyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and phenyl (meth) acrylate.

In formula (3), R ¹ is preferably hydrogen or a methyl group, and R ² is preferably an alkyl group having 1 to 12 carbon atoms. Among them, a methyl group and a cyclohexyl group are particularly preferable. Preferable examples of the monomer represented by the above formula (3) include methyl methacrylate (MMA) and cyclohexyl methacrylate (CHMA).
The structural unit represented by the formula (2) in the polymer is derived from a monomer represented by the following formula (4).

（式（４）において、Ｒ³は式（２）と同じである。）

(In Formula (4), R ³ is the same as Formula (2).)

  The monomer represented by the formula (4) is used for introducing an epoxy group (epoxy reaction point) into the polymer. The ink-jet ink containing the polymer is excellent in storage stability and hardly increases in viscosity during storage and discharge operations. One of the reasons is the epoxy group in formula (2) or formula (4). Is presumed to be because of glycidyl group. When an alicyclic epoxy acrylate is used instead of the monomer represented by the formula (4), the viscosity of the inkjet ink is likely to increase.

In the formula (4), R ³ is preferably hydrogen or a methyl group. Specific examples of the monomer represented by the formula (4) include glycidyl (meth) acrylate, and glycidyl methacrylate (GMA) is particularly preferable.

  The polymer may be a random copolymer or a block copolymer. Further, the polymer may contain main chain constituent units other than those of formula (1) or formula (2) as long as performance required for each detail of the color filter, such as hardness and transparency, can be ensured. Good. Specific examples of such a monomer include acrylonitrile and styrene.

  The content of the structural unit of formula (1) and the structural unit of formula (2) in the binder epoxy compound is derived from the monomer that derives the structural unit of formula (1) and the structural unit of formula (2). The weight ratio with the monomer to be charged (monomer that derives formula (1): monomer that derives formula (2)) is in the range of 10:90 to 90:10. preferable.

  When the amount of the structural unit of the formula (1) is more than the above ratio of 10:90, there is a possibility that the reaction point of curing decreases and the crosslinking density is lowered, whereas the structural unit of the formula (2) If the amount is more than the above ratio 90:10, the bulky skeleton may be reduced and curing shrinkage may be increased.

  The weight average molecular weight of the binder epoxy compound is preferably 3,000 or more, particularly 4,000 or more, when expressed in terms of polystyrene-converted weight average molecular weight. This is because if the molecular weight of the binder epoxy compound is less than 3,000, physical properties such as strength and solvent resistance required for the cured layer as the details of the color filter are likely to be insufficient. On the other hand, the weight average molecular weight of the binder epoxy compound is preferably 20,000 or less, more preferably 15,000 or less, when expressed in terms of polystyrene-converted weight average molecular weight. If the molecular weight is more than 20,000, the viscosity is likely to increase, and the stability of the ejection amount and the straightness of the ejection direction when ejecting from the ejection head by the inkjet method may be deteriorated, and the stability of long-term storage It is because there is a possibility that it may become worse.

  As the binder epoxy compound, a polystyrene-reduced weight average molecular weight (Mw) is in the above range, and a GMA / MMA copolymer polymerized using at least glycidyl methacrylate (GMA) and methyl methacrylate (MMA) is used. Is particularly preferred. The GMA / MMA copolymer may be polymerized by containing other monomer components as long as the object of the present invention can be achieved.

  As a synthesis example of the binder epoxy compound, for example, a solvent containing no hydroxyl group is charged into a four-necked flask equipped with a thermometer, a reflux condenser, a stirrer, and a dropping funnel, and the temperature is raised to 120 ° C. while stirring. . The reason for using a solvent that does not contain a hydroxyl group is to avoid the decomposition of the epoxy group during the synthesis reaction. Next, a mixture of the monomer represented by the above formula (3), the monomer represented by the above formula (4), and a composition obtained by combining other monomers as necessary with a polymerization initiator (dropping component) is 2 Drop at a constant rate from the dropping funnel over time. After completion of the dropping, the temperature is lowered to 120 ° C., a catalyst is added, the reaction is performed for 3 hours, and the reaction is terminated when the temperature is raised to 130 ° C. and kept for 2 hours, whereby the binder epoxy compound is obtained.

  The thermosetting binder forming system used in the present invention is an epoxy compound having two or more epoxy groups in one molecule (hereinafter sometimes referred to as “polyfunctional epoxy compound”), and the binder epoxy compound. Those having a smaller molecular weight may be used. Especially, it is preferable to use the said binder epoxy compound and the said polyfunctional epoxy compound together as mentioned above. In this case, the polystyrene equivalent weight average molecular weight of the polyfunctional epoxy compound is preferably 4,000 or less, and particularly preferably 3,000 or less, on condition that it is smaller than the binder epoxy compound combined therewith.

  Since the epoxy group (glycidyl group) is introduced into the binder epoxy compound by the structural unit represented by the formula (2), there is a limit to the amount of epoxy that can be introduced into the molecule of the copolymer. When a polyfunctional epoxy compound having a relatively small molecular weight is added to the ink-jet ink, the epoxy group is replenished in the ink-jet ink, the reaction point concentration of the epoxy is increased, and the crosslinking density can be increased.

  Among polyfunctional epoxy compounds, it is preferable to use an epoxy compound having four or more epoxy groups in one molecule in order to increase the crosslink density of the acid-epoxy reaction. In particular, when the weight average molecular weight of the binder epoxy compound is set to 10,000 or less in order to improve the discharge performance from the inkjet discharge head, the strength and hardness of the cured layer are likely to decrease. It is preferable to add a tetrafunctional or higher polyfunctional epoxy compound to the inkjet ink to sufficiently increase the crosslinking density.

  The polyfunctional epoxy compound is not particularly limited as long as it contains two or more epoxy groups in one molecule. For example, bisphenol A type epoxy resin, bisphenol F type epoxy resin, brominated bisphenol A type epoxy resin, Bisphenol S type epoxy resin, diphenyl ether type epoxy resin, hydroquinone type epoxy resin, naphthalene type epoxy resin, biphenyl type epoxy resin, fluorene type epoxy resin, phenol novolac type epoxy resin, orthocresol novolak type epoxy resin, trishydroxyphenylmethane type epoxy Resin, trifunctional epoxy resin, tetraphenylolethane type epoxy resin, dicyclopentadienephenol type epoxy resin, hydrogenated bisphenol A type epoxy resin, bisphenol A included Polyol type epoxy resins, polypropylene glycol type epoxy resins, glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, glyoxal type epoxy resins, alicyclic epoxy resins, and the like heterocyclic epoxy resin.

  More specifically, bisphenol A type epoxy resins such as trade name Epicoat 828 (manufactured by Japan Epoxy Resin Co., Ltd.), bisphenol F type epoxy resins such as trade name YDF-175S (manufactured by Tohto Kasei Co., Ltd.), trade name YDB-715 ( Hydroquinone such as brominated bisphenol A type epoxy resin such as Toto Kasei Co., Ltd., bisphenol S type epoxy resin such as EPICLON EXA1514 (Dainippon Ink Chemical Co., Ltd.) and trade name YDC-1312 (made by Toto Kasei Co., Ltd.) Type epoxy resin, naphthalene type epoxy resin such as trade name EPICLON EXA4032 (manufactured by Dainippon Ink and Chemicals), biphenyl type epoxy resin such as trade name Epicoat YX4000H (made by Japan Epoxy Resin), trade name Epicoat 157S70 (Japan Epoch) Bisphenol A type novolak epoxy resin such as Xylidine), trade name Epicoat 154 (made by Japan Epoxy Resin), phenol novolac type epoxy resin such as YDPN-638 (made by Tohto Kasei), trade name YDCN-701 Cresol novolak type epoxy resin (made by Toto Kasei Co., Ltd.), dicyclopentadiene phenol type epoxy resin such as EPICLON HP-7200 (made by Dainippon Ink & Chemicals, Inc.), trade name Epicoat 1032H60 (made by Japan Epoxy Resin Co., Ltd.) Such as trishydroxyphenylmethane type epoxy resin, trifunctional epoxy resin such as trade name VG3101M80 (manufactured by Mitsui Chemicals), and tetraphenylolethane type such as trade name Epicoat 1031S (made by Japan Epoxy Resin Co., Ltd.) Xi resin, tetrafunctional epoxy resin such as trade name Denacol EX-411 (manufactured by Nagase Kasei Kogyo Co., Ltd.), hydrogenated bisphenol A type epoxy resin such as trade name ST-3000 (manufactured by Toto Kasei Co., Ltd.), trade name Epicoat 190P ( Glycidyl ester type epoxy resin such as Japan Epoxy Resin Co., Ltd., glycidyl amine type epoxy resin such as YY-434 (manufactured by Tohto Kasei Co., Ltd.) Examples include alicyclic polyfunctional epoxy compounds such as trade name Eporide GT-401 (manufactured by Daicel Chemical Industries), and heterocyclic epoxy resins such as triglycidyl isocyanate (TGIC). Further, if necessary, a trade name Neotote E (manufactured by Toto Kasei Co., Ltd.) can be mixed as an epoxy reactive diluent.

  Among these polyfunctional epoxy compounds, bisphenol A type novolac epoxy resins such as trade name Epicoat 157S70 (manufactured by Japan Epoxy Resin Co., Ltd.) and cresol novolac type epoxy resins such as trade name YDCN-701 (manufactured by Tohto Kasei Co., Ltd.) Is particularly preferred.

<Blending ratio of epoxy compound>
The blending ratio of the binder epoxy compound and the polyfunctional epoxy compound blended as necessary is 10 to 80 parts by weight of the binder epoxy compound and 10 to 60 parts by weight of the polyfunctional epoxy compound in weight ratio. It is preferable to mix, and it is more preferable to mix 20-60 parts by weight of the binder epoxy compound and 20-50 parts by weight of the polyfunctional epoxy compound, and 30-40 parts by weight of the binder epoxy compound is multifunctional. It is particularly preferable to blend the epoxy compound in a proportion of 25 to 35 parts by weight.

ii) Curing Agent The thermosetting binder forming system used in the present invention is usually combined with a curing agent. As the curing agent, for example, a polyvalent carboxylic acid anhydride or a polyvalent carboxylic acid is used.
Specific examples of the polyvalent carboxylic acid anhydride include phthalic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, dodecenyl succinic anhydride, tricarballylic anhydride, maleic anhydride, hexahydrophthalic anhydride, dimethyltetrahydro anhydride Aliphatic or alicyclic dicarboxylic anhydrides such as phthalic acid, hymic anhydride, and nadic anhydride; fats such as 1,2,3,4-butanetetracarboxylic dianhydride and cyclopentanetetracarboxylic dianhydride Aromatic polycarboxylic dianhydrides; aromatic polycarboxylic anhydrides such as pyromellitic anhydride, trimellitic anhydride, and benzophenone tetracarboxylic anhydride; ester groups such as ethylene glycol bistrimellitate and glycerin tristrimitate Containing acid anhydrides, particularly preferably aromatic poly It may be mentioned carboxylic acid anhydrides. Moreover, the epoxy resin hardening | curing agent which consists of a commercially available carboxylic acid anhydride can also be used suitably.

  Specific examples of the polyvalent carboxylic acid used in the present invention include aliphatic polyvalent carboxylic acids such as succinic acid, glutaric acid, adipic acid, butanetetracarboxylic acid, maleic acid, and itaconic acid; hexahydrophthalic acid, Aliphatic polycarboxylic acids such as 1,2-cyclohexanedicarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, cyclopentanetetracarboxylic acid, and phthalic acid, isophthalic acid, terephthalic acid, pyromellitic acid, trimellitic acid, Aromatic polyvalent carboxylic acids such as 1,4,5,8-naphthalenetetracarboxylic acid and benzophenonetetracarboxylic acid can be mentioned, and aromatic polyvalent carboxylic acids can be mentioned preferably.

  These curing agents can be used singly or in combination of two or more. The amount of the curing agent used in the present invention is usually in the range of 1 to 100 parts by weight, preferably 5 to 100 parts by weight per 100 parts by weight of the epoxy group-containing component (binder epoxy compound and polyfunctional epoxy compound). 50 parts by weight. If the blending amount of the curing agent is less than 1 part by weight, curing may be insufficient and a tough coating film may not be formed. Moreover, when the compounding quantity of a hardening | curing agent exceeds 100 weight part, there exists a possibility that the adhesiveness with respect to the board | substrate of a coating film may be inferior.

iii) Catalyst In order to improve the hardness and heat resistance of the cured layer, a catalyst capable of promoting an acid-epoxy thermosetting reaction may be added to the thermosetting binder forming system used in the present invention. As such a catalyst, a thermal latent catalyst that exhibits activity during heat curing can be used.
The heat-latent catalyst exhibits catalytic activity when heated, accelerates the curing reaction and gives good properties to the cured product, and is added as necessary. The thermal latent catalyst is preferably one that exhibits acid catalytic activity at a temperature of 60 ° C. or higher. As such, a compound obtained by neutralizing a protonic acid with a Lewis base, a compound obtained by neutralizing a Lewis acid with a Lewis base, Lewis Examples thereof include a mixture of an acid and a trialkyl phosphate, sulfonic acid esters, onium compounds and the like, and various compounds described in JP-A-4-218561 can be used. Specifically, (i) compounds obtained by neutralizing halogenocarboxylic acids, sulfonic acids, phosphoric acid mono- and diesters with various amines such as ammonia, monomethylamine, triethylamine, pyridine, ethanolamine, or trialkylphosphine (B) compounds obtained by neutralizing Lewis acids such as BF ₃ , FeCl ₃ , SnCl ₄ , AlCl ₃ , ZnCl ₂ with the aforementioned Lewis base, (c) methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, etc. Examples include primary alcohols, ester compounds with secondary alcohols, (d) primary alcohols, secondary monoalcohol phosphate monoester compounds, and phosphate diester compounds. Examples of the onium compound include an ammonium compound [R ₃ NR ′] ⁺ X ⁻ , a sulfonium compound [R ₃ SR ′] ⁺ X ⁻ , and an oxonium compound [R ₃ OR ′] ⁺ X ⁻ . Here, R and R ′ are alkyl, alkenyl, aryl, alkoxy and the like.
The thermal latent catalyst is usually blended at a ratio of about 0.01 to 10.0 parts by weight with respect to a total of 100 parts by weight of the compound having two or more thermosetting functional groups in one molecule and the curing agent. .

(2) Photocurable binder-forming system i) Polymer In a binder-forming system containing a photocurable resin that can be polymerized and cured by light such as ultraviolet rays and electron beams, film formability and adhesion to the surface to be coated are exhibited. For the purpose of imparting, it is preferable to include a polymer having a relatively high molecular weight. Here, the relatively high molecular weight means that the molecular weight is higher than that of so-called monomers and oligomers, and the weight average molecular weight can be 5,000 or more. As a polymer having a relatively high molecular weight, any of a polymer having no polymerization reactivity per se and a polymer having a polymerization reactivity per se may be used, and a combination of two or more types may be used. May be. It is mainly composed of a polymer having a relatively high molecular weight, and if necessary, a polyfunctional monomer or oligomer, a monofunctional monomer or oligomer, a photopolymerization initiator activated by light, and a sensitizer. Thus, a photocurable binder forming system is constituted.

  In the case where a polymer having no polymerization reactivity per se is used as a polymer having a relatively high molecular weight, a polyfunctional polymerizable component such as a bifunctional or higher polyfunctional monomer or oligomer is blended in the binder forming system. In this case, in the binder formation system, the polyfunctional polymerizable component is polymerized spontaneously by light irradiation or polymerized by the action of other components such as a photopolymerization initiator activated by light irradiation. Thus, a network structure is formed in the coating film, and a component such as a resin or a pigment having no polymerization reactivity is wrapped in the network structure and cured.

As such a polymer having no polymerization reactivity, for example, a copolymer composed of two or more of the following monomers can be used: (meth) acrylic acid (hereinafter, this expression is expressed by acrylic acid and methacrylic acid). Both are collectively referred to)), methyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, benzyl (meth) acrylate, styrene, polystyrene macromonomer, and polymethylmethacrylate macromonomer.
More specifically, methacrylic acid / benzyl methacrylate copolymer, methacrylic acid / benzyl methacrylate / styrene copolymer, benzyl methacrylate / styrene copolymer, benzyl methacrylate macromonomer / styrene copolymer, benzyl methacrylate / styrene macromonomer A copolymer etc. can be illustrated.

As a polymer having a polymerization reactivity per se, it is an oligomer obtained by introducing a polymerizable functional group into a polymer molecule having no polymerization reactivity or a polymer having a higher molecular weight than an oligomer, and is subjected to light irradiation. Those that cause a polymerization reaction themselves or that induce a polymerization reaction by the action of other components such as a photopolymerization initiator activated by irradiation with light can be used.
Various ethylenic double bond-containing compounds themselves have polymerization reactivity and can be used as photocurable resins. Conventionally, prepolymers blended in UV inkjet inks used in various fields such as inks, paints and adhesives can be used as a polymer having a relatively high molecular weight in the present invention. Conventionally known prepolymers include radical polymerization type prepolymers, cationic polymerization type prepolymers, thiol / ene addition type prepolymers, and any of them may be used.

  Among these, radical polymerization type prepolymers are most easily available on the market, such as ester acrylates, ether acrylates, urethane acrylates, epoxy acrylates, amino resin acrylates, acrylic resin acrylates, unsaturated polyesters. Examples can be given.

Especially, the following graft polymers are mentioned as a comparatively high molecular weight polymer which can be used suitably in this invention.
The graft polymer suitably used in the present invention has a weight average molecular weight of 5,000 or more, and one of the main chain and the graft portion is composed of a styrenic polymer chain containing a styrenic monomer unit, and the other Is a graft polymer composed of methacrylate polymer chains containing methacrylate monomer units.

  The graft polymer may have a structure in which a main chain (trunk) is constituted by a styrene polymer chain and a graft part is constituted by a methacrylate polymer chain, and conversely, the main chain is constituted by a methacrylate polymer chain. And a structure in which a graft portion is constituted by a styrenic polymer chain. Among the above, those having a structure in which a main chain is constituted by a styrene polymer chain and a graft part is constituted by a methacrylate polymer chain are preferred.

  The styrenic polymer chain is a polymer chain mainly composed of a styrenic monomer, and may be a homopolymer of only one kind of styrenic monomer or a copolymer of two or more kinds of styrenic monomers. It may be a copolymer of a styrene monomer and another monomer.

In addition to styrene, the styrenic monomer includes styrene monomers with substituents such as alkyl-substituted styrene (methyl styrene, ethyl styrene, trimethyl styrene, octyl styrene, etc.), methoxy styrene, α-methyl styrene, and the like.
Examples of the monomer that can be copolymerized with the styrene monomer include various (meth) acrylate monomers, acrylonitrile, amide monomers, and the like.

In the inkjet ink used in the present invention, from the viewpoint of pigment dispersibility, the styrenic polymer chain preferably contains styrene monomer units in a proportion of 50% by weight or more, and more preferably in a proportion of 60% by weight or more. Is particularly preferred.
The methacrylate polymer chain is a polymer chain mainly composed of methacrylate and may be a homopolymer of only one type of methacrylate or a copolymer of two or more types of methacrylate, or methacrylate. And a copolymer of other monomers.

  As methacrylate monomers, alkyl methacrylate (methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, tert-butyl methacrylate, hexyl methacrylate, octyl methacrylate, lauryl methacrylate, etc.), benzyl methacrylate, phenoxyethyl methacrylate, tetrahydrophthalimide Examples include ethyl methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, tetrahydrofurfuryl methacrylate, methoxypolyethylene glycol methacrylate, and butoxyethyl methacrylate. It is preferable to select and use a methacrylate monomer so that a graft polymer having a Tg of 30 ° C. or higher can be obtained. A graft polymer having a Tg of less than 30 ° C. is not preferable because the film hardness after curing decreases.

Moreover, as a monomer to be copolymerized with methacrylate, alkyl acrylate, hydroxyalkyl acrylate, amide monomer, imide group-containing monomer, alkylene glycol (meth) acrylate, Daicel Chemical's brand name Plexel FM series, or the like can be used.
The methacrylate polymer has a relatively high Tg and is excellent in hardness and dispersibility because it causes microphase separation from styrene. From this point of view, the methacrylate polymer chain preferably contains a methacrylate monomer unit in a proportion of 50% by weight or more, more preferably 70% by weight or more.

  The graft polymer may have a photopolymerizable functional group such as an ethylenically unsaturated bond or an epoxy group. Photocurability can be imparted by introducing a photopolymerizable functional group into the graft polymer. The graft polymer into which the photopolymerizable functional group has been introduced can be suitably used as a photocurable resin having a relatively high molecular weight in the present invention since the crosslinking point is improved and the surface hardness is improved. When the polymerizable functional group of the graft polymer is an ethylenically unsaturated bond, it can be cured by a photoradical polymerization reaction, and when the polymerizable functional group is an epoxy group, photocationic polymerization is possible. . In particular, a graft polymer having an ethylenically unsaturated bond is used in combination with an ethylenically unsaturated bond-containing monomer such as a (meth) acrylic monomer and / or an oligomer to obtain an inkjet ink having excellent curing reactivity. Can do. The photopolymerizable functional group may be introduced into one or both of the styrenic polymer chain or the methacrylate polymer chain, or may be introduced into one or both of the main chain and the graft portion.

  Among them, the graft polymer has an ethylenically unsaturated bond in an ethylenically unsaturated bond equivalent of 1200 g / eq or less, and one of the main chain and the graft portion contains a styrene monomer unit. A preferred graft polymer is a graft polymer composed of a styrene methacrylate polymer chain and the other composed of a benzyl methacrylate polymer chain containing a monomer unit derived from benzyl methacrylate. Among the methacrylate monomers, benzyl methacrylate is particularly excellent in pigment dispersibility, and is therefore preferably used for an ink-jet ink for a color filter for forming pixels and the like.

The graft polymer may have a structure in which a main chain (trunk) is constituted by a styrene polymer chain and a graft part is constituted by a benzyl methacrylate polymer chain, and conversely, by a benzyl methacrylate polymer chain. It may have a structure in which the main chain is constituted and the graft portion is constituted by a styrene polymer chain. Among the above, those having a structure in which a main chain is constituted by a styrene polymer chain and a graft part is constituted by a benzyl methacrylate polymer chain are preferred.
The benzyl methacrylate polymer chain of the graft polymer is a polymer chain mainly composed of benzyl methacrylate, and may be a homopolymer of benzyl methacrylate, or a copolymer of benzyl methacrylate and other monomers as described above. It may be a coalescence.
The benzyl methacrylate-based polymer chain preferably contains benzyl methacrylate monomer units in a proportion of 30% by weight or more, particularly preferably 50% by weight or more.

  The graft polymer has at least one of the main chain or graft portion having an ethylenically unsaturated bond, and can be cured by light or thermal radical polymerization reaction. The ethylenically unsaturated bond equivalent of the graft polymer needs to be 1200 g / eq or less, and preferably 700 g / eq or less. Here, the ethylenically unsaturated bond equivalent is a value obtained by dividing the weight average molecular weight of the graft polymer by the number of ethylenically unsaturated bonds contained in one molecule. This is because when the ethylenically unsaturated bond equivalent of the graft polymer exceeds 1200 g / eq, the film hardness after curing and the solvent resistance may be insufficient. On the other hand, a graft polymer having an ethylenically unsaturated bond equivalent of 1200 g / eq or less is excellent in various physical properties such as solvent resistance, hardness, strength, and adhesion because there are many ethylenically unsaturated bonds contained in one molecule. is there. Even in the case where a graft polymer having a relatively low molecular weight is used in order to improve the ejection property, it can be sufficiently cured if the ethylenically unsaturated bond equivalent is 1200 g / eq or less, so that the ink has excellent ejection properties. This is because a cured film having excellent physical properties can be formed.

The weight ratio of the graft (branch) portion / main chain (trunk) portion of the graft polymer is preferably 20/80 to 80/20, and more preferably 30/70 to 70/30. If the weight ratio of the graft portion is less than 20%, the solubility, viscosity, fluidity, dischargeability and the like are deteriorated. On the other hand, when the weight ratio of the main chain portion is less than 20%, the pigment dispersibility is deteriorated.
Furthermore, by changing the acid value and amine value of the above graft polymer, various physical properties such as ink solvent solubility, film solvent resistance, pigment dispersion stability, dyeability, film hardness, and film strength can be adjusted. it can.

  The method for producing the graft polymer includes (1) a method in which a monomer is polymerized under a peroxide catalyst and grafted by hydrogen abstraction, and (2) a polymer having a functional group at one end and other functional groups. Although a method of adding the attached polymer and (3) a method of copolymerizing a polymerizable polymer (macromonomer) and a monomer can be used, the macromonomer method is preferred because the purity of the product is high. As a procedure for synthesizing the graft polymer, reference can be made to specific examples of paragraph numbers 0094 to 0105 of JP-A-2002-201387.

In addition, since the ink used in the present invention is an ink used in an ink jet system, the molecular weight of a polymer having a relatively high molecular weight is set so that the viscosity of the ink is too high to adversely affect the discharge performance from the discharge head. The weight average molecular weight is preferably 25,000 or less.
The polymer having a relatively high molecular weight is preferably blended at a ratio of 1 to 50% by weight with respect to the total solid content of the inkjet ink.

ii) Polyfunctional polymerizable component In order to improve the strength of the coating film and the adhesion to the substrate even in the case of using a polymer having a relatively high molecular weight that can be polymerized and cured, a polyfunctional monomer It is preferable to blend a polyfunctional polymerizable component such as olefin or oligomer. Polymer molecules with relatively high molecular weight that are polymerizable not only polymerize with polymers with relatively high molecular weight, but also polymerize with other polymerizable components such as polyfunctional monomers to form a network and cure. To do.
As the polyfunctional polymerizable component forming the network structure of the coating film, a bifunctional or higher functional monomer or oligomer can be used. In order to impart sufficient film strength and adhesion to the photocurable resin, a tetrafunctional or higher functional monomer or oligomer is usually used.

  However, in particular, since the ink used in the present invention is used as an ink jet ink, the polymerizable component other than the polymer having a relatively high molecular weight is a bifunctional to trifunctional monomer or oligomer or monomer having a relatively small number of functional groups. Is preferably used as a main component, and it is particularly preferable to use a bi- or trifunctional monomer having a viscosity of 100 cps or less. During ink jet spraying, it is difficult for the viscosity to increase at the tip of the head, clogging of the head does not occur, and ink ejection during operation is stable, so the amount and direction of ink ejection is stable. This is because the ink can be accurately and uniformly deposited on the substrate in a predetermined pattern.

  Examples of the bifunctional to trifunctional monomers include 1,6-hexanediol diacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, and polyethylene glycol diester. Examples thereof include acrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, and 3-butylene glycol dimethacrylate.

In the ink-jet ink used in the present invention, the blending ratio of the bi- to tri-functional monomer is preferably 20 to 70% by weight with respect to the total solid content of the ink-jet ink.
If the blending ratio of the bi- or trifunctional monomer is less than 20% by weight of the total solid content, the ink-jet ink is not sufficiently diluted with the monomer, and the viscosity of the ink is high from the beginning or becomes high after volatilization of the solvent. There is a risk of clogging the nozzles of the inkjet head. In addition, when the blending ratio of the bi- or trifunctional monomer exceeds 70% by weight of the total solid content, the cross-linking density of the coating film becomes low, and the solvent resistance, adhesion, and hardness of the coating film are inferior and sufficient. This is because the characteristics may not be obtained.

However, when all the polyfunctional monomers blended in the ink-jet ink are di- or tri-functional monomers, the viscosity increase due to drying of the ink is unlikely to occur, so that the ejection performance of the ink-jet head is stable. The cured layer obtained by curing the ink layer may have insufficient film strength, adhesion to the substrate, solvent resistance, and the like. Therefore, by adding an appropriate amount of a tetrafunctional or higher polyfunctional monomer or oligomer together with the above bifunctional to trifunctional monomers, the crosslinking density can be increased, and sufficient film strength and adhesion can be imparted to the pattern of the cured layer. .
Examples of tetrafunctional or higher polyfunctional monomers and oligomers include pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate, and the like.

The polyfunctional component having 4 or more functional groups is usually preferably blended at a ratio of 1 to 30% by weight with respect to the total solid content of the inkjet ink. The ink jet ink according to the present invention is 100 parts by weight of 2 to 3 functional monomers in order to balance discharge stability with 2 to 3 functional monomers and strength and adhesion improvement with 4 or more functional components. On the other hand, the blending ratio of the tetrafunctional or higher polyfunctional component is usually 1 to 50 parts by weight, desirably the lower limit of the blending ratio is 2 parts by weight or more, and / or the upper limit of the blending ratio is 35. It is preferable to be not more than parts by weight.
When the blending ratio of the tetrafunctional or higher polyfunctional component is less than 1 part by weight with respect to 100 parts by weight of the bi- to tri-functional monomer, characteristics such as hardness and solvent resistance after the ink is cured May not be sufficiently obtained. Moreover, when the said mixture ratio of the polyfunctional component more than tetrafunctional exceeds 50 weight part, there exists a possibility that the cure rate of an ink may become slow and process speed may become slow.

iii) Monofunctional polymerizable component In addition, a monofunctional monomer or oligomer may be blended in the photocurable binder forming system, if necessary.
Examples of monofunctional monomers and oligomers include vinyl monomers such as styrene and vinyl acetate, and monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate.

iv) Photopolymerization initiator The photocurable binder-forming system is usually blended with a photopolymerization initiator having activity with respect to the wavelength of the light source used. The photopolymerization initiator is appropriately selected in consideration of the difference in the reaction format of the resin or polyfunctional monomer (for example, radical polymerization or cationic polymerization) and the type of each material. For example, 1-hydroxycyclohexyl-phenyl ketone 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-monforinopropan-1-one, 2-benzyl-2- Dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, 1- [4- (2-hydroxyethoxy) phenyl] 2-hydroxy-2-methyl-1-propan-1-one, 2,4,6-trimethylbenzoyldiphenyl-phosphine oxide, bisacyl phosphite Oxide, benzoin ethyl ether, benzoin isobutyl ether, benzoin isopropyl ether, 2-isopropylthioxanthone, 2,4-diethylthioxanthone, 2- (3-dimethylamino-2-hydroxypropoxy) -3,4-dimethyl-9H-thioxanthone- 9-one mesochloride, benzophenone, methyl o-benzoylbenzoate, 4-benzoyl-4′-methyl-diphenyl sulfide, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl), p-dimethyl Aminobenzoic acid ethyl ester, p-dimethylaminobenzoic acid isoamyl ester, 1,3,5-triacroylhexahydro-s-triazine, 2- [2- (5-methylfuran-2-yl) ethenyl] -4 , 6-Bis (trichloromethyl) ) -S-triazine, 2- [2- (furan-2-yl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, methylbenzoylformate, 2,4,6-trimethylbenzoyldiphenylphos A photopolymerization initiator such as fin oxide can be used.

In addition, it is preferable that content of a photoinitiator is 0.1 to 5 weight% with respect to the whole solid content, and also 0.5 to 2 weight% with respect to the whole solid content.
Further, in order to impart sufficient adhesion, strength, and hardness to the cured ink layer, the total proportion of the binder-forming components in the total solid content of the ink including pigments and other components is 25% by weight or more. It is preferable to do this.

  In the inkjet ink according to the color filter manufacturing method of the present invention, the ratio of the weight of the pigment and the sum of the weight of the pigment dispersant and the binder forming system (P / V ratio) is 0.5 to 1.0, preferably 0.5 to 0.9, 0.5 to 1.2 when forming a G pixel, preferably 0.7 to 1.0, 0.3 to 0. 6, preferably 0.3 to 0.5. Such an ink is preferable from the viewpoints of ink ejection performance, prevention of ink breakage, and balance of film properties obtained. If the P / V ratio is too low, in order to obtain sufficient coloring power, it is necessary to increase the amount of ink droplets that adhere to the pixel formation region, which causes problems such as ink breaking from the pixel formation region. There is a case. On the other hand, if the P / V ratio is too high, there may be a problem that the ejection performance such as clogging or flight bending occurs in the ejection head or the film surface becomes rough.

  The solid concentration with respect to the total weight of the color filter ink-jet ink is 15 to 25% by weight, preferably 18 to 22% by weight. If the solid content concentration is too low, it is necessary to increase the amount of ink applied to the pixels, which causes problems such as breakage during patterning. On the other hand, if the solid content concentration is too high, there may be a problem such as a decrease in discharge performance such as clogging or flight bending at the discharge head.

(solvent)
The ink-jet ink used in the present invention is mixed with a solvent in order to prepare the ink as a high-concentration liquid for storage or to be immediately ejected from the head.
The ink-jet ink used in the present invention has a boiling point of 180 ° C. to 260 ° C., preferably 210 ° C. to 260 ° C. as a main solvent, and a vapor pressure at room temperature (particularly in the range of 18 ° C. to 25 ° C.) of 0.5 mmHg or less, preferably Uses a solvent component of 0.1 mmHg or less as a main solvent, and such a main solvent is blended in a proportion of 60% by weight or more based on the total amount of the solvent.

A solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less has an appropriate drying property and evaporation property. For this reason, if a single solvent or mixed solvent containing such a solvent component in a high blending ratio is used, the inkjet ink does not dry rapidly at the nozzle tip of the discharge head, causing a sudden increase in viscosity or clogging of the ink. Does not adversely affect the straightness and stability of discharge. Therefore, it is possible to accurately control the position of the pixel for which the definition is required and to uniformly control the average film thickness.
In addition, since the drying proceeds at an appropriate speed after spraying on the surface to be ejected, the ink is familiar with the surface to be coated, and the surface of the coating film becomes more horizontal and smooth. Can quickly and completely dry the ink, and can be controlled within the range of the pixel shape of the present invention. Furthermore, compared with the case where a wetting agent or a solvent having a very high boiling point is used, there is less possibility that the solvent remains in the coating film after the drying step.

If necessary, the organic solvent may contain a small amount of a solvent component other than the main solvent. However, even in that case, the main solvent having the above boiling point and vapor pressure is used in a proportion of 60% by weight or more based on the total amount of the solvent. When the ratio of the main solvent is less than 60% by weight of the total amount of the solvent, there are cases where it is not possible to reliably obtain the drying property and the evaporation property suitable for the ink jet method.
The main solvent is desirably used in the highest possible blending ratio, specifically at least 60% by weight or more, preferably 80% by weight or more, more preferably 90% or more, and preferably 100% by weight.

  By forming a wettability variable layer on the surface of the substrate and exposing it, an ink-philic region is formed on a portion of the substrate where the ink layer is to be formed, and the inkjet ink of the present invention is selectively applied to the ink-philic region by the inkjet method. When adhering to the liquid, the standard solution shown in the wettability test specified in JIS K6768 is used as the main solvent, and the contact angle (θ) after 30 seconds is measured after contact with the liquid droplets. A test in which the contact angle with respect to the surface of a test piece having a critical surface tension of 30 mN / m determined by the graph of 25 ° or more, preferably 30 ° or more, and the critical surface tension determined by the same measurement method is 70 mN / m. You may select and use what the contact angle with respect to the surface of a piece shows 10 degrees or less.

  When an ink is prepared using a solvent that exhibits the above behavior with respect to wettability, the ink exhibits a large repellent property with respect to the surface of the wettability variable layer before changing the wettability of the wettability variable layer described later. After changing the wettability of the wettability variable layer to increase the hydrophilicity, the wettability variable layer shows a great affinity for the surface of the wettability variable layer. Therefore, the difference between the wettability of the ink with respect to the ink-philic region formed by selectively exposing a part of the surface of the wettability variable layer and the wettability of the ink repellent region with respect to the surrounding region can be increased. As a result, the ink sprayed onto the ink-philic area by the ink jet method spreads evenly to every corner of the ink-philic area. As a result, a fine and precise ink layer pattern can be formed by the inkjet method.

  Here, the test piece having the above characteristics with respect to the critical surface tension may be formed of any material. Examples of test pieces having a critical surface tension of 30 mN / m include, for example, polymethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate having a smooth surface, and the polymer or surface modifier applied on a smooth glass surface. The above test can be actually performed from among those, and the corresponding one can be selected. Moreover, as a test piece which shows critical surface tension 70mN / m, the said test is actually performed from what apply | coated nylon, the glass surface which hydrophilized, etc., and the applicable thing can be selected.

  The main solvent can be selected from the following solvents: ethylene glycol monoethyl ether, glycol ethers such as diethylene glycol diethyl ether; glycol ether esters such as ethylene glycol monomethyl ether acetate; diethylene glycol Glycol oligomer ethers such as monomethyl ether; glycol oligomer ether esters such as diethylene glycol monomethyl ether acetate; aliphatic or aromatic esters such as ethyl acetate, propyl benzoate; dicarboxylic acid diesters such as diethyl carbonate; Alkoxycarboxylates such as methyl 3-methoxypropionate; ketocarboxylates such as ethyl acetoacetate; ethanol Alcohols or phenols such as isopropanol and phenol; aliphatic or aromatic ethers such as diethyl ether and anisole; alkoxy alcohols such as 2-ethoxyethanol and 1-methoxy-2-propanol; diethylene glycol and tripropylene Glycol oligomers such as glycol; alkoxy alcohol esters such as 2-ethoxyethyl acetate; ketones such as acetone and methyl isobutyl ketone.

  In addition, since the ink for a color filter used in the present invention contains a pigment, it is particularly preferable to use a main solvent that does not contain a hydroxyl group as the main solvent occupying most of the solvent. By using such a main solvent, an ink having dispersibility and dispersion stability of the pigment can be obtained. Moreover, when using a thermosetting binder formation system, the problem that an epoxy group decomposes | disassembles during a synthetic reaction as mentioned above can be avoided.

  Preferred solvents include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, diethyl malonate, succinate Examples thereof include dimethyl acid and diethyl succinate. These solvents are preferable not only because they satisfy the requirements of a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less, but also have no hydroxyl group in the molecule. Furthermore, these solvents are mixed with or without mixing with highly dispersible solvents conventionally used for preparing pigment dispersions such as 3-methoxybutyl acetate and propylene glycol monomethyl ether acetate (PGMEA). It can be used as a solvent to prepare a pigment dispersion.

  The above-mentioned solvent exemplified as a preferable example uses a standard solution shown in the wettability test specified in JIS K6768, measures the contact angle (θ) 30 seconds after contacting a droplet, The contact angle with respect to the surface of the test piece having a critical surface tension of 30 mN / m determined by the above is 25 ° or more, and the contact angle with respect to the surface of the test piece having a critical surface tension of 70 mN / m determined by the same measurement method is 10 Also meets the requirement to show below. Therefore, these solvents are mainly used when a wettability variable layer is provided on the surface of a substrate for exposure, and ink jet ink is selectively attached using a difference in wettability between an exposed portion and an unexposed portion. It can be suitably used as a solvent.

  Further, when water is mixed in the solvent, the hydroxyl group of the water molecule is present in the solvent, so that the same problem as in the case of using the solvent having a hydroxyl group may be caused. Therefore, it is preferable to prepare an inkjet ink using an organic solvent having low miscibility with water. From this viewpoint, the solubility of the solvent for preparing the ink-jet ink in water is preferably 20 parts by weight or less with respect to 100 parts by weight of water having a liquid temperature of 20 ° C.

  Among the main solvents mentioned as specific examples, diethylene glycol monobutyl ether acetate does not have a hydroxyl group, and the solubility in 100 parts by weight of water at a liquid temperature of 20 ° C. is low at 6.5 parts by weight. It is particularly preferable since it exhibits the property.

  The solvent is usually used at a ratio of 75 to 85% by weight with respect to the total amount of the ink-jet ink containing the solvent to prepare the ink-jet ink. When the amount of the solvent is too small, the viscosity of the inkjet ink is high, and in the case of the inkjet ink, it becomes difficult to discharge from the inkjet head. If there is too much solvent, the ink film deposited on the wettability change site will be broken before the ink deposit amount (ink deposition amount) for the predetermined wettability change site (ink layer formation site) is not sufficient, It protrudes to the surrounding unexposed area and further spreads to the adjacent wettability change site (ink layer forming site). In other words, the amount of ink that can be deposited without protruding from the wettability change site (ink layer forming site) to which the ink is to be deposited becomes insufficient, the film thickness after drying is too thin, The transmission density cannot be obtained.

  In the present invention, in particular, when a blending ratio of a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less as a main solvent is used by 90% by weight or more of the whole solvent, pigment dispersion In preparing the liquid, there may be a case where a sufficient amount of a conventionally used dispersion solvent such as 3-methoxybutyl acetate or propylene glycol monomethyl ether acetate (PGMEA) cannot be used. In that case, select a solvent with relatively good dispersibility and dispersion stability from among the solvents that can be used as the main solvent, and use a solvent mixed with the conventionally used dispersion solvent as the dispersion solvent. Alternatively, the main solvent is used as a dispersion solvent as it is.

(Leveling agent)
The inkjet ink used in the present invention can contain a leveling agent as necessary. As the leveling agent, for example, the following acrylic surfactants, fluorine surfactants, silicone surfactants, vinyl ether surfactants and the like are preferably used.

When the leveling agent is contained in the ink, the leveling agent diffuses over the entire surface of the film, the surface tension is made uniform over the entire pixel portion, and the evaporation of the solvent from the surface is made uniform, resulting in a difference in level of viscosity. Therefore, it is presumed that the solute flow in the drying process is eliminated or alleviated, and as a result, the edge bulge when the film is formed is reduced. In addition, in the inkjet ink for a color filter according to the present invention, when an acrylic surfactant is used, there is no problem in electrical characteristics and recoatability that makes it easy to repel an overcoat layer formed on a pixel. Has the advantage. The fluorosurfactant also has an effect of making it difficult to form a thick film portion at the pixel end, but when a fluorosurfactant is used, it is included within a range where the recoatability is not deteriorated.
When a leveling agent is added, it is usually added after the pigment dispersion step.

[Acrylic surfactant]
Here, the acrylic surfactant refers to a surfactant containing a polymer obtained from an acrylic monomer. Among them, a polymer obtained by using at least an alkyl acrylate monomer is preferable, and a polymer obtained by using an alkyl acrylate monomer having at least 2 to 9 carbon atoms in the alkyl group. It is preferable that it is a coalescence because it is difficult to form a thick film portion at the end.
Examples of acrylic acid alkyl ester monomers having 2 to 9 carbon atoms in the alkyl group include, for example, acrylic acid ethyl ester, acrylic acid normal propyl ester, acrylic acid isopropyl ester, acrylic acid normal butyl ester, acrylic acid isobutyl ester, and acrylic acid. Examples include acid tertiary butyl ester, acrylic acid normal octyl ester, acrylic acid 2-ethylhexyl ester, and acrylic acid isononyl ester.

  The acrylic surfactant used in the present invention is a copolymer or terpolymer comprising at least the above-mentioned alkyl acrylate monomer and further comprising two or more types of monomers using another monomer having an ethylenic double bond. However, among them, a homopolymer of the above-mentioned alkyl acrylate ester monomer, or a copolymer or terpolymer obtained by selecting two or more of the above-mentioned alkyl acrylate ester monomers. It is preferable that it is a copolymer. In these copolymers, when all the comonomers are acrylic acid alkyl ester comonomers having an alkyl group having 2 to 9 carbon atoms, the ratio is not particularly limited.

Examples of the method for synthesizing the alkyl acrylate polymer or copolymer used in the present invention include an emulsion polymerization method, a suspension polymerization method, a solution polymerization method, a bulk polymerization method, and the like, and an initiator for carrying out the polymerization. As such, generally used azo polymerization initiators and peroxides are used.
In addition, the weight average molecular weight of the acrylic surfactant is preferably 1000 to 100,000, and more preferably 1000 to 60000 from the viewpoint of the effect of making it difficult to form a thick film portion at the end. In addition, the weight average molecular weight in this invention is calculated | required by polystyrene conversion in GPC measurement.

  Further, the SP value of the acrylic surfactant is preferably 8 to 9, and more preferably 8 to 8.5 from the viewpoint of the effect of making it difficult to form a thick film portion at the end. Further, the SP value of the acrylic surfactant is preferably 1 to 1.5 different from the SP value of the binder-forming system used, and the SP value of the acrylic surfactant is the binder used. It is preferably 1 to 1.5 lower than the SP value of the forming system. When the SP value of the acrylic surfactant has a value in the above range, the acrylic surfactant is compatible with the binder forming system in the coated ink during drying and heating. Therefore, it is presumed that the surfactant is easily collected near the surface, the surfactant is diffused over the entire surface of the coating film, the surface tension of the entire coating film surface is increased, and drying from the coating film surface is easily uniformized. On the other hand, when the SP value is smaller than the above range, the effect as a leveling agent may not be sufficiently exhibited. Further, when the SP value is larger than the above range, it becomes difficult to spread evenly on the substrate, and surface roughness may occur in the cured coating film.

Here, the SP value is an index indicating the compatibility and incompatibility between substances. If the difference in SP value between the two substances to be mixed is small, the compatibility and solubility are large, and the solubility becomes easy. On the other hand, if the difference is large, the compatibility and solubility are small, and it becomes hardly soluble or insoluble.
There are several methods for measuring and calculating the SP value. In the present invention, "Specific Interactions and the Miscibility of" written by Michael M. Coleman, John F. Graf, Paul C. Painter (Pennsylvania State Univ.) Is used. The calculation method described in Polymer Blends "(1991), Technomic Publishing Co. is used. However, since the -COOH group and -OH group are not described, the values described in Polymer Engineering and Science, 14 (2), 147 (1974) written by RF Fedors are used.

The acrylic surfactant used in the present invention is obtained from an acrylic monomer even if other components are added, as long as a polymer obtained from the acrylic monomer is contained as a main component. The resulting polymer may be chemically modified.
Commercially available products of acrylic surfactants include those manufactured by Enomoto Kasei Co., Ltd., trade names: L-1983-50, 230, L-1982-50, L-1984-50, LHP-95, and the like. .

  The content of the acrylic surfactant is 0.001 to 5% by weight with respect to the whole solid content, 0.001 to 2% by weight with respect to the whole solid content, and particularly 0 with respect to the whole solid content. It is preferable that the content is 0.01 to 1.5% by weight from the point of making it difficult to form a thick film portion at the end. If the amount is less than 0.001% by weight, an appropriate effect may not be exhibited, and the end may become a thick film. On the other hand, if the amount exceeds 5% by weight, the end of the coating film becomes too low and the end of the pixel ends. There is a risk of white spots. Here, the solid content of the inkjet ink for specifying the blending ratio includes all components except for the solvent, and liquid polymerizable monomers and the like are also included in the solid content. The content of the acrylic surfactant is expressed as the solid content of the acrylic surfactant.

[Fluorosurfactant]
In the present invention, the fluorosurfactant refers to a surfactant containing fluorine. The fluorinated surfactant is usually one obtained by substituting all or part of the hydrogen atoms of the hydrophobic group of the hydrocarbon surfactant with fluorine atoms.

  As the fluorosurfactant used in the present invention, at least a monomer (A) containing a fluorinated alkyl group and an ethylenic double bond and a monomer (B) containing a silicone chain and an ethylenic double bond are used. A polymerized fluorine-based copolymer is preferable from the viewpoint that a thick film portion hardly occurs at the end.

  As the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond, known ones can be used. Specifically, a compound represented by the following general formula (a1), or Examples include compounds having a plurality of perfluoroalkyl groups in one molecule such as the compound represented by the general formula (a2).

（式中、Ｒ^f は炭素原子数１〜２０のパ−フロロアルキル基又は部分フッ素化アルキル基を表し、これらのアルキル基は直鎖状又は分岐状であっても良く、また、主鎖中に酸素原子が介入したもの（例えば、−（ＯＣＦＣＦ₂）₂ＣＦ（ＣＦ_３）₂ 等）であっても良く、Ｒ^１ はＨ、ＣＨ₃、Ｃｌ又はＦを表し、Ｘは２価の連結基を表し、ａは０又は１を表す。）

(In the formula, R ^f represents a perfluoroalkyl group having 1 to 20 carbon atoms or a partially fluorinated alkyl group, and these alkyl groups may be linear or branched, and in the main chain. It may be an oxygen atom intervening (for example, — (OCFCF ₂ ) ₂ CF (CF ₃ ) ₂ etc.), R ¹ represents H, CH ₃ , Cl or F, and X is a divalent linkage. Represents a group, and a represents 0 or 1.)

（式中、ｊは１〜１４の整数を表す。）
一般式（ａ１）におけるＸは、具体的には、下記式で表される連結鎖が挙げられる。

(Wherein j represents an integer of 1 to 14)
Specific examples of X in the general formula (a1) include a connecting chain represented by the following formula.

（式中、ｎは１〜１０の整数を表し、Ｒ² はＨ又は炭素原子数１〜６のアルキル基を表す。）

(In the formula, n represents an integer of 1 to 10, and R ² represents H or an alkyl group having 1 to 6 carbon atoms.)

フッ素化アルキル基とエチレン性二重結合を含有するモノマー（Ａ）中のパ−フロロアルキル基又は部分フッ素化アルキル基の炭素原子数は、３以上が好ましく、６以上が特に好ましい。フッ素化アルキル基とエチレン性二重結合を含有するモノマー（Ａ）の具体例としては、以下の式（ａ−１）〜（ａ−５６）で表される化合物が挙げられる。

The number of carbon atoms of the perfluoroalkyl group or partially fluorinated alkyl group in the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond is preferably 3 or more, and particularly preferably 6 or more. Specific examples of the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond include compounds represented by the following formulas (a-1) to (a-56).

  As the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond, a single compound may be used, or two or more kinds of compounds may be used in combination.

  On the other hand, the monomer (B) containing a silicone chain and an ethylenic double bond can also be a known one, and a polysiloxane chain has one or both ends via a divalent linking group, A group in which a functional group having an ethylenic double bond such as a vinyl group, an acryloyl group, or a methacryloyl group is linked is preferable. The monomer (B) containing a silicone chain and an ethylenic double bond preferably has a (meth) acryloyl group from the viewpoint of polymerization reactivity.

  Specific examples of the monomer (B) containing a silicone chain and an ethylenic double bond include, for example, a compound represented by the general formula (b-1) or a compound represented by the general formula (b-2). Can be mentioned.

［式中、Ｒ³及びＲ⁴は、各々独立的に、炭素原子数１〜２０のアルキル基又はフェニル基を表し、また、シロキシ単位毎に同一でも異なっていてもよい。ｐは３〜５２０の整数を表し、ｑは０又は１を表し、Ｘ² は２価の連結基であって、具体的には、一般式 −ＣＨ₂ＣＨ（ＯＨ）ＣＨ₂ＯＣＯ−、−（ＣＨ₂）_ｎ１ＮＨＣＨ₂ＣＨ（ＯＨ）ＣＨ₂ＯＣＯ−、−（ＣＨ₂）_ｎ１ＯＣＯ−、−（ＣＨ₂）_ｎ１−Ｏ−（ＣＨ₂）_ｍ１ＯＣＯ− 又は −ＯＣＨ₂ＣＨ（ＯＨ）ＣＨ₂ ＯＣＯ−（式中、ｎ¹及びｍ¹は、それぞれ独立的に、２〜６の整数を表す。）で表される連結鎖を表す。Ｒ¹ は前記一般式（ａ１）において定義したものと同じものを表し、Ｚ¹はメチル基、フェニル基又は一般式 ＣＨ₂＝Ｃ（Ｒ¹）−（Ｘ²）_q−で表される基を表す。］

[Wherein, R ³ and R ⁴ each independently represents an alkyl group having 1 to 20 carbon atoms or a phenyl group, and may be the same or different for each siloxy unit. p represents an integer of 3 to 520, q represents 0 or 1, X ² represents a divalent linking group, specifically, a general formula —CH ₂ CH (OH) CH ₂ OCO—, — _{(CH 2) n1 NHCH 2 CH} (OH) CH 2 OCO -, - (CH 2) n1 OCO -, - (CH 2) n1 -O- (CH 2) m1 OCO- or -OCH ₂ CH (OH) CH ₂ represents a connecting chain represented by OCO- (wherein n ¹ and m ¹ each independently represents an integer of 2 to 6). R ¹ represents the same as defined in the general formula (a1), Z ¹ represents a methyl group, a phenyl group, or a group represented by the general formula CH ₂ ═C (R ¹ ) — (X ² ) _q —. Represents. ]

（式中、Ｒ⁵、Ｒ⁵'、Ｒ⁵''、Ｒ⁶、Ｒ⁶'、Ｒ⁶''、Ｒ⁷、Ｒ⁷'及びＲ⁷''は、各々独立的に、炭素原子数１〜２０のアルキル基又はフェニル基を表す。ｒ、ｓ及びｔは、各々独立的に、０又は１〜２００の整数を表す。Ｘ²、ｑ及びＲ¹は、一般式（ｂ−１）において定義したものと同じものを表す。）

(Wherein R ⁵ , R ⁵ ′, R ⁵ ″, R ⁶ , R ⁶ ′, R ⁶ ″, R ⁷ , R ⁷ ′ and R ⁷ ″ each independently represent 1 carbon atom) Represents an alkyl group or a phenyl group of ˜20, r, s and t each independently represent 0 or an integer of 1 to 200. X ² , q and R ¹ are represented by the general formula (b-1) Represents the same as defined.)

  The molecular weight of the silicone chain portion of the monomer (B) containing a silicone chain and an ethylenic double bond is preferably 5,000 or less, and particularly preferably 1,000 or less. Further, the structure of the silicon chain portion is preferably a branched type as represented by the general formula (b-2), and among them, in the general formula (b-2), r, s and Those having t = 0 are particularly preferred.

  Specific examples of the monomer (B) containing a silicone chain and an ethylenic double bond include compounds represented by the following formulas (b-1-1) to (b-3-7).

  As the monomer (B) containing a silicone chain and an ethylenic double bond, a single compound may be used, or two or more kinds of compounds may be used in combination.

  As the fluorosurfactant used in the present invention, in particular, a monomer represented by (a-1) as a monomer (A) containing a fluorinated alkyl group and an ethylenic double bond, a silicone chain and an ethylenic dimer The fluorine-containing copolymer polymerized using at least the monomer represented by (b-3-1) as the monomer (B) containing a heavy bond, or contains a fluorinated alkyl group and an ethylenic double bond Polymerized using at least the monomer represented by (a-56) as the monomer (A) and the monomer represented by (b-2-1) as the monomer (B) containing a silicone chain and an ethylenic double bond. The fluorinated copolymer is preferable from the viewpoint that a thick film portion is hardly formed at the end.

  Moreover, the fluorine-type surfactant used for this invention is a monomer (A) containing the said fluorinated alkyl group and an ethylenic double bond as a constituent monomer, and a monomer containing a silicone chain and an ethylenic double bond ( In addition to B), a monomer containing a non-fluorine and non-silicone ethylenic double bond may be used in combination.

  Non-fluorine and non-silicone ethylenic double bond monomers include, for example, styrene, nucleus-substituted styrene, acrylonitrile, vinyl chloride, vinylidene chloride, vinyl pyridine, N-vinyl pyrrolidone, vinyl sulfonic acid, acetic acid Fatty acid vinyl such as vinyl; α, β-ethylenically unsaturated carboxylic acid such as mono- or divalent carboxylic acid such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid; (meth) acrylic acid (Meth) acrylic acid alkyl ester having 1 to 18 carbon atoms in the alkyl group such as methyl, ethyl, propyl, butyl, octyl, 2-ethylhexyl, decyl, dodecyl, stearyl ester; 2-hydroxyethyl ester, hydroxy Like propyl ester, hydroxybutyl ester (me 1) Hydroxyalkyl ester of 1 to 18 carbon atoms of acrylic acid; aminoalkyl ester of 1 to 18 carbon atoms of (meth) acrylic acid such as dimethylaminoethyl ester, diethylaminoethyl ester, diethylaminopropyl ester; methoxyethyl C3-C18 ether oxygen-containing alkyl esters of (meth) acrylic acid such as esters, ethoxyethyl esters, methoxypropyl esters, methyl carbyl esters, ethyl carbyl esters, butyl carbyl esters;

  Dicyclopentanyloxylethyl (meth) acrylate, isobornyloxylethyl (meth) acrylate, isobornyl (meth) acrylate, adamantyl (meth) acrylate, dimethyladamantyl (meth) acrylate, dicyclopentanyl (meth) acrylate, di Mono (meth) acrylic ester of polyalkylene glycol such as cyclopentenyl (meth) acrylate, polyethylene glycol having a polymerization degree of 1 to 100, polypropylene glycol, copolymer of ethylene oxide and propylene oxide, or the like Di (meth) acrylic acid esters, or polyethylene glycols having a degree of polymerization of 1 to 100, capped with alkyl groups having 1 to 6 carbon atoms, polypropylene glycol, and ethylene oxide and propylene. Polyalkylene glycol having a copolymer of N'okishido - Le mono (meth) acrylic acid ester,

  Alkyl vinyl ethers having 1 to 18 alkyl carbon atoms such as methyl vinyl ether, propyl vinyl ether, dodecyl vinyl ether; glycidyl ester of (meth) acrylic acid such as glycidyl methacrylate and glycidyl acrylate; styrene macromonomer 4500 manufactured by Sartomer, new Macromonomer such as NK ester M-230G manufactured by Nakamura Chemical Co., Ltd .; 2- (meth) acryloyloxyethyl succinic acid, 2-acrylamido-2-methylpropanesulfonic acid, partially sulfonated styrene, mono (acryloyloxy) And ethyl) acid phosphate and mono (methacryloxyethyl) acid phosphate.

  Among these non-fluorine and non-silicone ethylenic double bond monomers, polyalkylenes such as polyethylene glycol, polypropylene glycol and copolymers of ethylene oxide and propylene oxide in the side chain Poly (ethylene glycol) or polypropylene glycol having a degree of polymerization of 1 to 100, which is capped with a mono (meth) acrylate or di (meth) acrylate of glycol or an alkyl group having 1 to 6 carbon atoms at the end And a (meth) acrylate monomer having a polyoxyalkylene group in the side chain, such as a mono (meth) acrylate ester of polyalkylene glycol such as a copolymer of ethylene oxide and propylene oxide; carbon atom (Meth) acrylic acid having an alkyl group of at least 6 In a side chain an alkyl group having 6 or more carbon atoms as ether (meth) acrylate monomers are preferred.

  A monomer (A) containing a fluorinated alkyl group and an ethylenic double bond and a monomer (B) containing a silicone chain and an ethylenic double bond, and if necessary, non-fluorine and non-silicone There is no limitation on the production method of the fluorine-based polymer that is copolymerized with a monomer containing an ethylenic double bond, and a known method, that is, a polymerization mechanism such as a radical polymerization method, a cation polymerization method, or an anion polymerization method is used. Based on this, it can be produced by a solution polymerization method, a bulk polymerization method, an emulsion polymerization method or the like, but a radical polymerization method is particularly convenient and industrially preferable.

In this case, known polymerization initiators can be used, for example, peroxides such as benzoyl peroxide and diacyl peroxide, azo compounds such as azobisisobutyronitrile and phenylazotriphenylmethane, Examples include metal chelate compounds such as triacetylacetonate manganese. In the polymerization reaction, if necessary, a coupling group such as lauryl mercaptan, 2-mercaptoethanol, ethylthioglycolic acid, octylthioglycolic acid, γ-mercaptopropyltrimethoxysilane, etc. A chain transfer agent such as a thiol compound having a polymerization initiator can be used in combination with the polymerization initiator.
The fluorine-based random or block copolymer according to the present invention can also be obtained by photopolymerization in the presence of a photosensitizer or photoinitiator or by polymerization using radiation or heat as an energy source.

  The polymerization can be carried out in the presence or absence of a solvent, but it is preferably carried out in the presence of a solvent from the viewpoint of workability. Examples of the solvent include alcohols such as ethanol, isopropyl alcohol, n-butanol, iso-butanol and tert-butanol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; methyl acetate, ethyl acetate and acetic acid. Esters such as butyl; polar solvents such as dimethylformamide and dimethyl sulfoxide; halogenated solvents such as 1,1,1-trichloroethane and chloroform; ethers such as tetrahydrofuran and dioxane; benzene, toluene and xylene Aromatics such as perfluorooctane and perfluorotri-n-butylamine.

  The copolymerization ratio of the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond to the monomer (B) containing a silicone chain and an ethylenic double bond is 100: 1 to 1: A range of 100 is preferred, and a range of 40: 1 to 1:40 is particularly preferred. Further, a monomer (A) containing a fluorinated alkyl group and an ethylenic double bond, and a monomer (B) containing a silicone chain and an ethylenic double bond are combined with a non-fluorine and non-silicone ethylenic double bond. When introducing a monomer containing a bond, relative to the total weight of the monomer (A) containing a fluorinated alkyl group and an ethylenic double bond and the monomer (B) containing a silicone chain and an ethylenic double bond, 1,000 times or less are preferable, and 100 times or less are particularly preferable.

  The molecular weight of the fluoropolymer used in the present invention is a number average molecular weight (Mn), preferably in the range of 1,000 to 2,000,000, particularly preferably in the range of 1,000 to 500,000.

  Among the commercially available fluorosurfactants, Megafac R-08MH, Megafac F482, Megafac F470, Megafac F471, Megafac F472SF, HAS-36, etc. manufactured by Dainippon Ink and Chemicals, Inc. are preferable. Used for.

  The content of the fluorosurfactant is 0.0001 to 1% by weight based on the entire solid content, more preferably 0.0001 to 0.6% by weight based on the entire solid content, and particularly based on the entire solid content. 0.001 to 0.3% by weight is preferable from the viewpoint of making it difficult to form a thick film portion at the end. If the amount is less than 0.0001% by weight, an appropriate effect may not appear, and the end may be thick. On the other hand, if the amount exceeds 1% by weight, the end of the coating film becomes too low and the end of the pixel is not covered. There is a possibility that white spots may occur and recoatability may be inferior. Moreover, content of the said fluorosurfactant is represented as solid content of fluorosurfactant. In the present invention, recoatability means that repelling occurs when a coating liquid for forming a layer such as an overcoat layer is applied onto a coating film formed using the inkjet ink according to the present invention. A property that can be applied uniformly. When the recoating property is deteriorated, it means that repelling occurs when a coating liquid for layer formation such as an overcoat layer is applied on the coating film formed using the inkjet ink according to the present invention, Specifically, it refers to a state in which the film thickness of the coating liquid for forming a layer such as an overcoat layer is thin and non-uniform around a minute protrusion as a nucleus.

[Silicone surfactant]
In the present invention, a silicone surfactant containing a polyether and / or polyester-modified polydimethylsiloxane structure may further be contained in an amount of 0.001 to 2.5% by weight based on the entire solid content. This is because the silicone surfactant also has an effect of making it difficult to form a thick film portion at the end. However, when the silicone-based surfactant exceeds 2.5% by weight based on the entire solid content, the electrical characteristics and recoatability may be deteriorated.
Among the above, the silicone-based surfactant is preferably a silicone-based surfactant having a phenyl group in view of the effect of making it difficult to form a thick film portion at the end. Moreover, as a weight average molecular weight of a silicone type surfactant, it is preferable that it is 500-10000, and it is more preferable that it is 1000-3000.

As a commercial item of a silicone type surfactant, Big Chemie Japan Co., Ltd. make, brand name: BYK-307, BYK-300, BYK-302, BYK-306, BYK-330, BYK-331, BYK-344, BYK-silclean 3700; manufactured by Shin-Etsu Chemical Co., Ltd., trade names KP-321 and KP-324 are preferably used.
The content of the silicone surfactant is 0.001 to 2.5% by weight with respect to the whole solid content, more preferably 0.001 to 1.25% by weight with respect to the whole solid content, and particularly the whole solid content. It is preferable that it is 0.01-0.75 weight% with respect to the point which makes it difficult to produce a thick film part at an edge part. If the amount is less than 0.001% by weight, an appropriate effect may not be exhibited, and the end may become a thick film. On the other hand, if the amount exceeds 2.5% by weight, the end of the coating film becomes too low and the pixel end There is a possibility that white spots may occur in a part, a volume resistance value may increase and a problem may occur in electrical characteristics, and recoatability may be inferior. Moreover, content of the said silicone type surfactant is represented as content of the solid content of the said silicone type surfactant.

[Vinyl ether surfactant]
The ink-jet ink used in the present invention may contain a vinyl ether surfactant. Here, the vinyl ether surfactant is a surfactant made of a polymer obtained using a vinyl ether monomer.
The vinyl ether monomer used for the vinyl ether surfactant is preferably an alkyl vinyl ether represented by the formula (5).

（式中のＲ^８は１〜８の直鎖状又は分岐鎖状の炭化水素である。）
式（５）中のＲ^８は、炭素数が１〜８の直鎖状又は分岐鎖状の炭化水素である。好ましくは炭素数が３〜４、より好ましくは炭素数が４の直鎖状又は分岐鎖状の炭化水素である。炭素数が８を上回ると重合体の溶剤等への溶解性が低下するおそれがある。アルキルビニルエーテルとしては、メチルビニルエーテル、エチルビニルエーテル、ｎ−プロピルビニルエーテル、イソプロピルビニルエーテル、ｎ−ブチルビニルエーテル、イソブチルビニルエーテル、ｔ−ブチルビニルエーテル、ペンチルビニルエーテル、ヘキシルビニルエーテル、２−エチルヘキシルビニルエーテルなどが挙げられるが、中でも、ビニルエーテルモノマーとしてイソブチルビニルエーテルを用いたビニルエーテル系界面活性剤が、端部に厚膜部分を生じ難くする点から好ましい。

(R ⁸ in the formula is 1 to 8 linear or branched hydrocarbons.)
R ⁸ in the formula (5) is a linear or branched hydrocarbon having 1 to 8 carbon atoms. Preferably, it is a linear or branched hydrocarbon having 3 to 4 carbon atoms, more preferably 4 carbon atoms. If the number of carbon atoms exceeds 8, the solubility of the polymer in a solvent or the like may decrease. Examples of the alkyl vinyl ether include methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, t-butyl vinyl ether, pentyl vinyl ether, hexyl vinyl ether, 2-ethylhexyl vinyl ether, among others. A vinyl ether surfactant using isobutyl vinyl ether as the vinyl ether monomer is preferred from the viewpoint of making it difficult to form a thick film portion at the end.

  In the vinyl ether surfactant, the vinyl ether monomer and another monomer may be used for copolymerization. As copolymerizable monomers, nitrogen-containing vinyl ethers such as diethylaminoethyl vinyl ether, dimethylaminoethyl vinyl ether and morpholine ethyl vinyl ether; vinyl esters such as vinyl acetate; allyl ethers such as allyl phenyl ether; allyl esters such as allyl acetate , Maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; fumaric acid diesters such as diisopropyl fumarate and dicyclohexyl fumarate; maleic anhydride; itaconic anhydride and the like. As the polymerization method, a polymerization method such as radical polymerization or ionic polymerization can be employed. The alkyl vinyl ether represented by the formula (5) is preferably contained in an amount of 70 to 100% by weight, more preferably 80 to 100% by weight, based on the whole monomer to be polymerized. When the amount is less than 70 parts by weight, an appropriate effect does not appear, and the end portion may be thick.

  The vinyl ether surfactant preferably has a weight average molecular weight of 1,000 to 10,000, more preferably 1,500 to 5,000, from the viewpoint of the effect of making it difficult to form a thick film portion at the end. In addition, the weight average molecular weight in this invention is calculated | required by polystyrene conversion in GPC measurement.

Further, the SP value of the vinyl ether surfactant is preferably 8 to 9, and more preferably 8 to 8.5 from the viewpoint of the effect of making it difficult to form a thick film portion at the end. In the case of the inkjet ink for a color filter according to the present invention, since the carboxyl group is latent, it is excellent in solubility with the above vinyl ether surfactant, and further the vinyl ether surfactant is bound by deblocking when heated. It becomes easy to collect in the vicinity of the surface without being incompatible in the forming system, the surfactant is diffused over the entire surface of the coating film, the surface tension of the entire coating film surface is set to an appropriate level, and the drying from the coating film surface is uniform. It is presumed that it is easy to be made.
For example, in the case of polyvinyl isobutyl ether, the SP value is 8.35, and in the case of polyvinyl isopropyl ether, the SP value is 8.31.

Further, the content of the vinyl ether surfactant is 0.05 to 1.25% by weight with respect to the entire solid content, and further 0.10 to 1.00% by weight with respect to the entire solid content. This is preferable from the point of making it difficult to form a thick film portion at the end. If the amount is less than 0.05% by weight, an appropriate effect may not appear, and the end may become a thick film. On the other hand, if the amount exceeds 1.25% by weight, the end of the coating becomes too low and the pixel end There is a possibility that white spots may occur in a part, a volume resistance value may increase, and a problem may occur in electrical characteristics, and recoatability may be inferior. In addition, content of the said vinyl ether type surfactant is represented as content of the solid content of a vinyl ether type surfactant.
As a commercially available product of vinyl ether surfactant, Enomoto Kasei Co., Ltd., trade name: LHP-90 and the like are preferably used.
In addition to the above surfactants, fatty acid ester surfactants, special acrylic polymers, and the like can be used.

(Other ingredients)
Furthermore, the ink for ink for color filters used for this invention can mix | blend 1 type (s) or 2 or more types of other additives as needed. The following can be illustrated as such an additive.
a) Filler: For example, glass, alumina and the like.
b) Adhesion promoter: for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane.
c) Ultraviolet absorber: For example, 2- (3-t-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, alkoxybenzophenone and the like.
d) Anti-aggregation agent: for example, sodium polyacrylate.

(Ink production method)
The ink-jet ink used in the present invention may be produced by introducing each component into a single solvent or a solvent that is a mixed solvent and mixing them, and dissolving or dispersing the solid components.
However, when the pigment is directly put into the whole solvent together with other components such as a binder forming system and mixed with stirring, the pigment is often not sufficiently dispersed in the solvent. Therefore, usually, a solvent having good dispersibility and dispersion stability of the pigment is prepared, and the pigment is added thereto together with the dispersant, and sufficiently stirred with a dissolver or the like to prepare a pigment dispersion. Then, the obtained pigment dispersion, together with the components other than the pigment, is put into a solvent consisting essentially of the main solvent or only of the main solvent, and sufficiently stirred and mixed by a dissolver or the like, whereby the ink jet according to the present invention Ink can be used.

  As the remaining solvent into which the pigment dispersion is charged, an inkjet ink having a composition obtained by subtracting the amount of the solvent used for preparing the pigment dispersion from the final composition of the entire solvent is diluted to the final concentration. May be completed. Alternatively, a high-concentration inkjet ink may be prepared by introducing the pigment dispersion into a relatively small amount of the main solvent. The high-concentration ink-jet ink can be stored as it is and diluted to the final concentration just before use and used in the ink-jet method.

2. Step (B) of forming an ink layer
Next, the inkjet ink prepared in the step (A) is selectively attached to a predetermined region on the transparent substrate by an inkjet method to form an ink layer. Since the ink jet method is used, productivity is higher than conventional photolithography methods and the like, and cost reduction and yield improvement can be realized.

Hereinafter, the step (B) of forming the ink layer will be described with reference to FIG.
First, a transparent substrate for a color filter is prepared as shown in FIG.
The transparent substrate 5 is not particularly limited as long as it is conventionally used for a color filter. For example, the transparent substrate 5 is not transparent, such as quartz glass, Pyrex (registered trademark) glass, or synthetic quartz plate. A transparent material having flexibility such as a rigid material, a transparent resin film, an optical resin plate, or the like can be used. Among them, Corning 7059 glass is a material having a small coefficient of thermal expansion, excellent dimensional stability and workability in high-temperature heat treatment, and is an alkali-free glass containing no alkali component in the active matrix. Suitable for color filters for color liquid crystal display devices. In the present invention, a transparent substrate is usually used, but a reflective substrate or a white colored substrate can also be used. Moreover, you may use the board | substrate which surface-treated for the purpose of alkali elution prevention, gas-barrier provision, and other purposes as needed.

Next, as shown in FIG. 2B, a black matrix layer 6 is formed in a region serving as a boundary between pixel portions on one surface side of the transparent substrate 5.
The black matrix layer 6 is a partition for adhering ink to a predetermined region, and is provided so as to surround the pixels 7R, 7G, and 7B and the outside of the pixel formation region, thereby improving the contrast of the display image. Can do.

  The black matrix layer 6 has a height of 2.0 μm to 3.0 μm, more preferably 2.0 μm to 2.5 μm, and in particular, when manufacturing using an inkjet method, the color filter according to the present invention can be easily obtained. It is preferable because it can be used. If the height of the black matrix layer exceeds 3.0 μm, the strength and pattern accuracy of the black matrix layer may be insufficient. In addition, the obtained pixel has a shape in which the vicinity of the central portion is greatly depressed, and this shape is a particularly significant factor in improving the decrease in luminance. On the other hand, when the thickness is less than 2.0 μm, the ink layer is easily broken, and the obtained pixel has a shape in which the film thickness in the vicinity of the end of the black matrix is greatly reduced and the central portion is greatly raised. This also causes a decrease in luminance.

When a metal thin film is formed as the black matrix layer 6, it can be formed by patterning the thin film. As the patterning method, a normal patterning method such as a sputtering method or a vacuum deposition method can be used.
Moreover, when forming a layer containing light-shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments in a resin binder as the black matrix layer 6, a patterning method is a photolithography method. A generally used method such as a printing method can be used. Or you may form using an inkjet system similarly to the pixel 7 mentioned later.
From the viewpoint of easy formation of the black matrix layer having the above height, it is preferable to use a black matrix layer containing light-shielding particles in a resin binder.

  Next, as shown in FIG. 2C, an ink-repellent partition wall 20 having a width smaller than that of the black matrix layer is formed in the center in the width direction of the pattern of the black matrix layer as necessary. The composition of such an ink repellent partition is not particularly limited as long as it is a resin composition having ink repellent properties. Moreover, it does not need to be transparent in particular and may be colored. For example, a material that is used for the black matrix layer and does not include a black material can be used. Specifically, a composition in which one or more aqueous resins such as polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose are mixed, or an O / W emulsion type resin composition, for example, reactive silicone emulsion And the like. For reasons such as easy handling and curing, a photocurable resin is preferably used. Further, since the ink-repellent partition wall is more preferable as the ink repellency is stronger, the surface thereof may be treated with an ink-repellent treatment agent such as a silicone compound or a fluorine-containing compound.

  The patterning of the ink repellent partition wall can be performed by printing using a coating liquid of the ink repellent resin composition or photolithography using a photocurable coating liquid. The height of the ink repellent partition wall is preferably high to some extent because it is provided to prevent ink from being mixed when colored by the ink jet method as described above. Specifically, although it varies depending on the amount of ink deposited, it is usually preferably in the range of 0.1 μm to 2.0 μm.

Next, the ink-jet inks used in the present invention, in which red (R), green (G), and blue (B) pigments are blended, are prepared. Then, as shown in FIG. 2D, the pixel forming ink jets corresponding to the respective color pixel forming regions 21R, 21G, and 21B defined by the pattern of the black matrix layer 6 on the surface of the transparent substrate 5. Ink is selectively deposited by an ink jet method to form an ink layer. The ink layer is formed so that a red pattern, a green pattern, and a blue pattern are arranged in a desired form such as a mosaic type, a stripe type, a triangle type, or a four-pixel arrangement type. In this ink spraying process, it is difficult for the ink-jet ink to increase in viscosity at the tip of the head 22 and to maintain good ejection properties. In this case, the ink of the corresponding color can be adhered accurately and uniformly in the predetermined pixel formation region, and a pixel portion without color unevenness or color loss can be formed with an accurate pattern. In addition, since the inkjet ink for pixel formation of each color can be simultaneously sprayed onto the substrate using a plurality of heads, the working efficiency is improved as compared with the case where the pixel portion is formed for each color by a method such as printing. Can do.
The amount of ink to be attached varies depending on the composition of the ink, but the amount of ink necessary to obtain the pixel shape described later is attached to the pixel formation region.

3. Step of forming pixels (C)
Next, the ink layer obtained in the step (B) is cured to form a pixel having a shape unique to the present invention. As shown in FIG. 2E, the ink layers 23R, 23G, and 23B of the respective colors are dried and pre-baked as necessary, and then cured by being appropriately exposed and / or heated. When the ink layer is appropriately exposed and / or heated, the crosslinking element of the curable resin contained in the inkjet ink causes a crosslinking reaction, and the ink layer is cured to form pixels.

  The pixel of the color filter obtained by the present invention is characterized in that the thickness is non-uniform within the pixel region due to restrictions on the manufacturing method. As described above, the shape of the pixel according to the present invention has a portion with a small thickness along the outer edge portion of the pixel or the vicinity thereof, and the maximum thickness portion on the center side of the pixel with respect to the thin portion. Or a portion having a large thickness along the outer edge of the pixel or in the vicinity thereof, and having a minimum portion on the center side of the pixel from the thick portion. In addition, the surface may be uneven. Here, the outer edge portion of the pixel is an edge portion that defines the planar shape of the pixel. Further, “along the outer edge portion of the pixel or the vicinity thereof” means that it is only necessary to have a portion having a small thickness along at least a part of the outer edge portion or the vicinity thereof. The pixel thickness refers to the height from the reference surface (surface having an average height) of the substrate. In the following description, the case of a shape having a portion having a small thickness along the outer edge portion of the pixel or the vicinity thereof and having a maximum thickness portion closer to the center of the pixel than the portion having the small thickness is mainly described. explain.

3A and 3B are cross-sectional views of an example of the pixel of the color filter according to the present invention in the direction perpendicular to the transparent substrate. 3A and 3B, the pixel 31 has a portion 34 having a small thickness at the outer edge portion 32 of the pixel or its vicinity 33, and is closer to the center of the pixel than the portion 34 having the small thickness. The shape has a maximum thickness portion 35.
A pixel having a non-uniform thickness, such as a pixel having a cross-sectional shape in which the vicinity of the central portion is raised, can be obtained when formed using, for example, an inkjet method. In the case of using the ink jet method, pixels can be formed with high definition, and there is an advantage that cost reduction and yield improvement can be realized. Note that a pixel with a non-uniform thickness, such as a pixel having a cross-sectional shape in which the vicinity of the central portion is raised, may be formed by a method other than the inkjet method.

  A pixel having a cross-sectional shape in which the vicinity of the central portion is raised as described above is significantly different from the shape of a pixel formed by using a spin coating method. As shown in FIG. 4A, a pixel formed by using the spin coating method has a substantially constant thickness. When there is a portion where the thickness is not constant, the pixel is usually near the center of the pixel. There is no swell, and there is a swell in the portion of the end of the pixel that has ridden on the black matrix as shown in FIG.

  In each pixel constituting the color filter obtained by the present invention, the average film thickness is 1.5 μm to 2.5 μm, the film thickness distribution is in the range of 1.0 μm to 3.0 μm, and the film thickness in one pixel. Is 1.5% or less and the total area ratio of the regions of 2.5 μm or more is 5% or less. A color filter having such pixels is a color having pixels obtained by a spin coating method having an average film thickness with sufficient color characteristics and a substantially uniform thickness, although the shape of the pixels is slightly non-uniform. Compared with a filter, there is a merit that a decrease in luminance is small and color characteristics are equal or close.

The average thickness of the pixels, the thickness distribution, and the ratio of the total area of the regions where the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more are, for example, three-dimensional non-contact surface shape measurement by an optical interference method It can be measured using an apparatus (product name Micromap 557N, manufactured by US Micromap). The average film thickness (μm) of pixels is obtained by calculating the film thickness of all areas of the pixel formation region every 1 μm and calculating the average of them. The film thickness distribution (μm) of the pixel means the film thickness distribution of the pixel formation region. As the film thickness distribution becomes wider, the flatness of the pixel tends to be worse. Further, the flatness tends to be worse as the ratio of the total area of the regions having a film thickness of 1.5 μm or less and 2.5 μm or more in one pixel is larger.
Here, the ratio of the total area of the regions having a film thickness of 1.5 μm or less and 2.5 μm or more in one pixel is defined by the following equation.

R (%) = (n ₁ + n ₂ ) / n ₀ × 100
(However, R is the total ratio (%) of the area of the region where the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more, n ₁ is the number of measurement points where the film thickness is 1.5 μm or less, (n ₂ represents the number of measurement points having a film thickness of 2.5 μm or more, and n ₀ represents the number of measurement points in all areas of the pixel formation region.)

  The average film thickness of the pixels obtained by the present invention is 1.5 μm to 2.5 μm. When the average film thickness of the pixels is within the above range, the obtained color filter is equivalent to or equivalent to a color filter formed by a spin coat method and having pixels with an average film thickness capable of obtaining sufficient color characteristics. Has close color characteristics.

The G pixel usually has less coloring power than the R pixel and B pixel, so that the P / V ratio is increased or the average film thickness is increased to increase the display with other pixels. However, if the P / V ratio is too high, the average film thickness of the G pixel is 1.6 μm or more, and preferably 1.8 μm or more because the solvent resistance of the pixel is poor. For this reason, in order to eliminate the film thickness difference of RGB, it is necessary to make the average film thickness of all RGB into 1.5 micrometers or more.
On the other hand, when a pixel having an average film thickness of 2.5 μm or more is manufactured by the inkjet method, the height of the black matrix layer is limited as described above, and therefore the amount of ink to be sprayed in the step of forming the ink layer is small. If the height of the black matrix layer becomes too large, ink breakage may occur, and color mixing may occur in the obtained pixels. Therefore, the average film thickness of the pixels needs to be 2.5 μm or less, preferably 2.2 μm or less.
If it is within the range of the average film thickness of the above-mentioned pixels, for example, the red pixel 7R is the thinnest, and the thickness of each color pixel is changed so that the green pixel 7G and the blue pixel 7B become thicker in this order. You may set to thickness.

The film thickness distribution of the pixels having the above average film thickness is in the range of 1.0 μm to 3.0 μm. In addition, when the film thickness distribution exceeds 3.0 μm, the luminance may decrease as described above.
Moreover, the ratio of the total area of the area | region where the film thickness in 1 pixel of the pixel which has the said average film thickness and film thickness distribution is 1.5 micrometers or less and 2.5 micrometers or more is 5% or less.

  The average film thickness in each pixel constituting the color filter obtained by the present invention is 1.7 μm to 2.4 μm, the film thickness distribution is 1.5 μm to 2.5 μm, and the film thickness in one pixel is 1. The ratio of the total area of the regions of 5 μm or less and 2.5 μm or more is more preferably 3% or less.

  The pixels of the color filter are usually formed with three colors of red (R), green (G), and blue (B). The coloring pattern shape in the pixel can be a known arrangement such as a stripe type, a mosaic type, a triangle type, or a four-pixel arrangement type, and the coloring area can be arbitrarily set.

In the present invention, the luminance loss ΔY (%) is used as an index that mainly represents a decrease in luminance derived from the shape of the pixel. The luminance loss ΔY is obtained from the following formula.
ΔY (%) = (Y ₂ −Y ₁ ) / Y ₂ × 100
(However, Y ₁ means the luminance of the color filter to be measured, and Y ₂ means the luminance of the color filter obtained by the spin coating method.)
Here, the spin coating method is a method of forming pixels by applying ink for inkjet onto a transparent substrate by spin coating and curing.

Evaluation of luminance loss can be performed as follows.
First, using an inkjet method, a color filter to be measured is prepared by arranging pixels of the same color with a desired shape as shown in the cross-sectional view of FIG. Next, substantially flat pixels are arranged as shown in the cross-sectional view of FIG. 6B with the same chromaticity as the color filter to be measured (x, G in the case of R, and y in the case of B). A color filter obtained by spin coating is prepared.

Next, out of the prepared pixel region of the color filter, using a wide-area spectroscopic device (trade name “Shimadzu Autograph Spectrophotometer UV-3100PC”, manufactured by Shimadzu Corporation), the sample detection area is 4 mm wide and 11 mm high. Y ₁ and Y ₂ are calculated from the result of spectral transmission spectrum measurement in the visible wavelength region, and the luminance loss ΔY is obtained from the equation (1).
The color filter obtained by the present invention preferably satisfies ΔY (%) ≦ 5. When the luminance loss is within the above range, the luminance is comparable to that of a color filter having a pixel thickness obtained by a photolithography method having an average film thickness that can provide sufficient color characteristics and a substantially uniform thickness.
Note that microspectrophotometry, which is usually used as a method for measuring the luminance of a color filter, is a panel in which the evaluation result is an actual usage mode when luminance is evaluated for pixels having a non-uniform thickness characteristic of an inkjet color filter. Therefore, it cannot be used for the luminance measurement of the present invention.

Next, as shown in FIG. 2F, the protective film 8 is formed on the side of the transparent substrate on which the pixels 24R, 24G, and 24B are formed.
The protective film 8 is provided to flatten the surface of the color filter and prevent the components contained in the pixels 7 from eluting into the liquid crystal layer. The protective film 8 covers the black matrix layer 6 and the pixels 7 by a known negative photocurable transparent resin composition or thermosetting transparent resin composition by a method such as spin coater, roll coater, spray, printing, etc. And can be formed by curing with light or heat.
The thickness of the protective film 8 can be set in consideration of the light transmittance of the material used, the surface state of the color filter, and the like, and can be set, for example, in the range of 0.1 μm to 2.0 μm.
In others, it can manufacture using the method similar to the method of forming a normal color filter.

4). Color Filter The color filter according to the present invention includes at least a transparent substrate and pixels containing a pigment, a pigment dispersant, and a binder formed on the transparent substrate, and each pixel has an average film thickness of 1. 5 μm to 2.5 μm, the film thickness distribution is in the range of 1.0 μm to 3.0 μm, and the total ratio of the area of the region where the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more is 5 % Or less. Even when using a forming method that tends to make the pixel shape non-uniform due to restrictions such as the inkjet method, such a color filter has a flat pixel shape with the same average film thickness and the same material composition ratio. Compared with a color filter having
As a method for forming a color filter according to the present invention, a known method such as a dyeing method, a printing method, and an electrodeposition method may be used in addition to the inkjet method.

  FIG. 5 is a longitudinal sectional view showing an example (color filter 103) of the color filter according to the present invention. The color filter 103 covers a black matrix 6 formed in a predetermined pattern on the transparent substrate 5, pixels 7 (7R, 7G, 7B) formed in a predetermined pattern on the black matrix, and covers the pixels. The formed protective film 8 is provided. A transparent electrode film 9 for driving liquid crystal is formed on the protective film 8. An alignment film 10 is formed on the innermost surface of the color filter 103, in this case on the transparent electrode.

The columnar spacer 12 is a shape of a convex spacer, and is formed at a plurality of predetermined locations (four locations in FIG. 5) on the transparent electrode 9 in accordance with the region (non-display region) where the black matrix layer 6 is formed. ing. The columnar spacer 12 is formed on the transparent electrode 9, the pixel 7, or the protective film 8. In the color filter 102, columnar spacers are formed in a sea-island shape on the protective film 8 via the transparent electrode film 9, but the protective film 8 and the columnar spacer 12 are integrally formed and covered thereover. A transparent electrode film 9 may be formed. When the color filter does not include a black matrix layer, columnar spacers can be formed in regions where pixels are not formed.
Hereinafter, each component will be described.

(Transparent substrate)
The transparent substrate constituting the color filter of the present invention is the same as that described in the above manufacturing method.

(Pixel)
The pixel constituting the color filter of the present invention preferably contains a pigment, a pigment dispersant, and a binder, and further contains a leveling agent as necessary.
Among the components of the binder forming system described in the description of the binder forming system, the binder includes a reaction product of a component having reactivity in the step of curing the ink layer, and has no reactivity. For a component, that component is included.
The details are the same as those described in the manufacturing method.

(Black matrix layer)
The black matrix layer is provided in order to improve the contrast of the display image. However, when a color filter by an inkjet method is created, it also serves as a partition for partitioning each pixel.
When the black matrix layer is provided, the height is 2.0 μm to 3.0 μm, and further 2.0 μm to 2.5 μm. It is preferable because a filter can be easily obtained. The details are the same as those described in the manufacturing method.

(Protective film)
The protective film is the same as that described in the manufacturing method.

(spacer)
A plurality of convex spacers are provided in a non-display area on the substrate in order to maintain a cell gap when the color filter 103 is bonded to a liquid crystal driving side substrate such as a TFT array substrate. The shape and size of the convex spacer are not particularly limited as long as it can be selectively provided in a non-display region on the substrate and can maintain a predetermined cell gap over the entire substrate. When the columnar spacer 12 as shown in the figure is formed as a convex spacer, it has a certain height in the range of about 2 μm to 10 μm, and the protruding height (pattern thickness) is required for the liquid crystal layer. It can set suitably from thickness etc. Moreover, the thickness of the columnar spacer 12 can be appropriately set within a range of about 5 μm to 20 μm. Further, the formation density (density) of the columnar spacers 12 can be appropriately set in consideration of the thickness unevenness of the liquid crystal layer, the aperture ratio, the shape and material of the columnar spacers, for example, red, green and blue Necessary and sufficient spacer function is expressed at a ratio of one for each pixel. The shape of such a columnar spacer may be a columnar shape, and may be, for example, a columnar shape, a prismatic shape, a truncated cone shape, or the like.

  The convex spacer is, for example, applied by applying a coating solution of the curable resin composition directly on the transparent substrate by a method such as spin coater, roll coater, spray, printing, or through another layer such as a transparent electrode. And dried to form a curable resin layer. The rotational speed of the spin coater may be set within a range of 500 to 1500 revolutions / minute, as in the case of forming the protective film. Usually, a photocurable ink-jet ink is preferably used as the ink-jet ink for forming the spacer. Next, the resin layer is exposed through a photomask for a convex spacer, and then a developer such as an alkaline liquid is used. Development is performed to form a predetermined convex pattern, and this convex pattern is heat-treated (post-baked) in a clean oven or the like as necessary to form a convex spacer.

  The convex spacer can be provided directly on the color filter or indirectly through another layer. For example, a transparent electrode such as ITO or a protective film may be formed on the color filter, and a convex spacer may be formed thereon, or a protective film and a transparent electrode may be formed on the color filter in this order, and the transparent electrode A convex spacer may be formed on the top.

(Transparent electrode)
The transparent electrode 9 can be formed using indium tin oxide (ITO), zinc oxide (ZnO), tin oxide (SnO), or an alloy thereof. The thickness of the transparent electrode can be about 20 to 500 nm, preferably about 100 to 300 nm.

(Other layers)
Other members usually formed on the color filter may be further included. The alignment film and other members can be formed by a usual method using those usually used for color filters.

  Hereinafter, the present invention will be described more specifically with reference to examples. These descriptions do not limit the present invention. In the examples, parts represent parts by weight unless otherwise specified.

(Production Example 1: Synthesis of binder epoxy compound)
In a four-necked flask equipped with a thermometer, reflux condenser, stirrer, and dropping funnel, the solvent diethylene glycol monobutyl ether acetate (also called butyl carbitol acetate, hereinafter referred to as BCA) does not contain a hydroxyl group according to the blending ratio shown in Table 1. 40.7 parts by weight were charged and heated with stirring to 140 ° C. Next, 54.7 parts by weight of a mixture (dropping component) of a monomer having a composition described in Table 1 and a polymerization initiator at 140 ° C. was dropped at a constant rate from a dropping funnel over 2 hours. After completion of the dropwise addition, the temperature was lowered to 110 ° C., 4.6 parts by weight of a mixture of polymerization initiator and solvent-free diethylene glycol monobutyl ether acetate (BCA) (additional catalyst component) was added, and the temperature at 110 ° C. was maintained for 2 hours. By the way, by terminating the reaction, a binder epoxy compound having the characteristics shown in Table 1 was obtained.

＊１）表中の略号は以下の通りである。
ＧＭＡ：グリシジルメタクリレート
ＭＭＡ：メチルメタクリレート
パーブチルＯ：ｔ−ブチルパーオキシ２−エチルヘキサノエート（日本油脂（株）製商品名）
＊２）重量平均分子量：ゲル浸透クロマトグラフィーによるポリスチレン換算の値である。

* 1) Abbreviations in the table are as follows.
GMA: Glycidyl methacrylate MMA: Methyl methacrylate Perbutyl O: t-Butylperoxy 2-ethylhexanoate (trade name, manufactured by NOF Corporation)
* 2) Weight average molecular weight: A value in terms of polystyrene by gel permeation chromatography.

Example 1
(1) Preparation of red pigment dispersion A pigment, a pigment dispersant, and an organic solvent are mixed in the following ratio, and 500 parts by weight of zirconia beads having a diameter of 0.3 mm are added, and a paint shaker (manufactured by Asada Tekko) is used. After dispersion for 4 hours, PR254 (CI Pigment Red 254) pigment dispersion and PR177 (CI Pigment Red 177) pigment dispersion were prepared, respectively.

[Composition of pigment dispersion]
Pigment: 10 parts by weight Pigment dispersant (Ajisper Pb821 (manufactured by Ajinomoto Fine Techno Co., Ltd.) (solid content in organic solvent 30% by weight)): 20 parts by weight BCA (diethylene glycol monobutyl ether acetate): 50 parts by weight The glass transition temperature of the pigment dispersant Azisper Pb821 is as follows: using a thermochemical reaction calorimeter (manufactured by Seiko Instruments Inc.) under the conditions of a temperature range of 25 to 280 ° C. and a heating rate of 7.5 ° C./min. It was 57 degreeC when measured.

(2) Preparation of binder A rotor coated with Teflon (registered trademark) was placed in a sample bottle and placed on a magnetic stirrer. In this sample bottle, add the binder-type epoxy compound, polyfunctional epoxy resin, etc. described in Preparation Example 1 according to the following proportions, dissolve with sufficient stirring at room temperature, and then add a diluent solvent to adjust the viscosity. After stirring and dissolving, this was filtered to obtain a binder composition.

[Binder composition]
-Binder epoxy compound of Production Example 1 (solid content 30% by weight in solvent BCA): 10 parts by weight-Multifunctional epoxy resin (trade name Epicoat 154, manufactured by Japan Epoxy Resin): 2 parts by weight-Neopentyl glycol glycidyl ether : 1 part by weight-trimellitic acid: 2 parts by weight-BCA (diethylene glycol monobutyl ether acetate): 1 part by weight

(3) Preparation of inkjet ink In the blending ratio shown in Table 2, the prepared PR254 pigment dispersion, PR177 pigment dispersion, and binder composition were sufficiently mixed to prepare an inkjet ink.

(4) Formation of coating film (a) Formation of coating film by spin coating method A curable resin composition for black matrix is used on a glass substrate (manufactured by Asahi Glass Co., Ltd.) having a thickness of 0.7 mm and 10 cm × 10 cm. A black matrix pattern having a line width of 20 μm and a film thickness of 2.2 μm was formed by photolithography.
An ink jet ink was applied to the entire surface of the black matrix pattern by a spin coating method to form a red coating film in which x coincides with the color plate substrate prepared by the ink jet.
The film thickness after drying of the coating film obtained by the spin coating method was measured by a contact-type film thickness measuring device (trade name “Dectak-3030ST” manufactured by Nippon Vacuum Technology Co., Ltd.).

(B) Formation of coating film by inkjet method On a 10 cm × 10 cm glass substrate (manufactured by Asahi Glass Co., Ltd.) having a thickness of 0.7 mm, a line width of 20 μm by a photolithography method using a curable resin composition for black matrix, A black matrix pattern having a thickness of 2.2 μm was formed.
The inkjet ink was adhered to the pixel forming portion partitioned by the black matrix of the substrate by an inkjet method.

  Then, it dried under reduced pressure at 10 Torr for 120 seconds, and also pre-baked for 10 minutes on an 80 degreeC hotplate. Thereafter, the substrate was post-baked by heating at 200 ° C. for 30 minutes in a clean oven, and further post-baked by heating at 240 ° C. for 30 minutes to form a pixel pattern on the substrate. The total ratio of the average film thickness after drying, the film thickness distribution, the area of 1.5 μm or less and the area of 2.5 μm or more of the coating film obtained by the ink jet method is an optical interference type three-dimensional non-contact surface shape measuring device (Product name Micromap 557N, manufactured by US Micromap).

(Example 2)
(1) Preparation of Green Pigment Dispersion A pigment, a pigment dispersant, and an organic solvent are mixed in the following ratio, 500 parts by weight of zirconia beads having a diameter of 0.3 mm are added, and a paint shaker (manufactured by Asada Tekko) is used. After dispersion for 4 hours, PG36 (CI Pigment Green 36) pigment dispersion and PY150 (CI Pigment Yellow 150) pigment dispersion were prepared.

[Composition of pigment dispersion]
Pigment: 10 parts by weight Pigment dispersant (Ajisper Pb821 (manufactured by Ajinomoto Fine Techno Co., Ltd.) (solid content 30% by weight in organic solvent)): 20 parts by weight BCA (diethylene glycol monobutyl ether acetate): 50 parts by weight

(2) Preparation of binder A binder composition was prepared in the same manner as in Example 1.

(3) Preparation of inkjet ink In the blending ratio shown in Table 2, the prepared PG36 pigment dispersion, PY150 pigment dispersion, and binder composition were sufficiently mixed to prepare an inkjet ink.

(4) Formation of coating film Formation of the coating film by the spin coat method and formation of the coating film by the inkjet method were performed in the same manner as in Example 1.

(Example 3)
(1) Preparation of blue pigment dispersion A pigment, a pigment dispersant, and an organic solvent are mixed in the following ratio, 500 parts by weight of zirconia beads having a diameter of 0.3 mm are added, and a paint shaker (manufactured by Asada Tekko) is used. After dispersion for 4 hours, PB15: 6 (CI Pigment Blue 15: 6) pigment dispersion and PV23 (CI Pigment Violet 23) pigment dispersion were prepared.

[Composition of pigment dispersion]
Pigment: 10 parts by weight Pigment dispersant (Solsperse 33000 (Avecia) (solid content 30% by weight in organic solvent)): 20 parts by weight BCA (diethylene glycol monobutyl ether acetate): 50 parts by weight The agent Solsperse 33000 is liquid at 23 ° C.

(2) Preparation of binder A binder composition was prepared in the same manner as in Example 1.

(3) Preparation of inkjet ink In the mixing ratio shown in Table 2, the prepared PB15: 6 pigment dispersion, PV23 pigment dispersion, and binder composition were sufficiently mixed to prepare an inkjet ink.

(4) Formation of coating film Formation of the coating film by the spin coat method and formation of the coating film by the inkjet method were performed in the same manner as in Example 1.

Example 4
In the preparation process of Example 1 (3) inkjet ink, after sufficiently mixing the above-prepared PR254 pigment dispersion, PR177 pigment dispersion, and binder composition at the blending ratio shown in Table 2, 0.5% by weight of vinyl ether surfactant (trade name “LHP-90”, manufactured by Enomoto Kasei Co., Ltd.) as a leveling agent based on the total weight of the mixed PR254 pigment dispersion, PR177 pigment dispersion, and binder composition. Except for adding and mixing, a coating film was formed by a spin coating method and a coating film was formed by an ink jet method in the same manner as in Example 1.
(Comparative Examples 1-12)
(1) Preparation of red pigment dispersion For Comparative Examples 1 to 6, red pigment dispersions were prepared in the same manner as in Example 1. In Comparative Example 7, Example 1 was used except that Disperbyk161 (manufactured by Big Chemie Japan) (solid content 30% by weight in an organic solvent) having a main chain structure in which isocyanates were polymerized was used as a pigment dispersant. Prepared in the same manner. Comparative Example 8 is the same as in Example 1 except that Disperbyk 2000 ((BIC Chemie Japan) (solid content 30 wt% in organic solvent)), which is a modified acrylic block copolymer, was used as the pigment dispersant. Prepared similarly. Comparative Example 9 was prepared in the same manner as in Example 2 except that Disperbyk161 (manufactured by Big Chemie Japan) (solid content of 30% by weight in an organic solvent) was used as the pigment dispersant. Comparative Example 10 was prepared in the same manner as Example 2 except that Disperbyk 2000 ((BIC Chemie Japan) (solid content 30 wt% in organic solvent)) was used as the pigment dispersant. Comparative Example 11 was prepared in the same manner as in Example 3 except that Disperbyk161 (manufactured by Big Chemie Japan) (solid content of 30% by weight in an organic solvent) was used as the pigment dispersant. Comparative Example 12 was prepared in the same manner as in Example 3 except that Disperbyk 2000 (manufactured by Big Chemie Japan) (solid content of 30% by weight in an organic solvent) was used as the pigment dispersant.
In addition, the glass transition temperature of the pigment dispersant Disperbyk161 was 261 ° C. when measured in the same manner as Azisper Pb821. Further, the glass transition temperature of the pigment dispersant Disperbyk 2000 was 194 ° C. when measured in the same manner as that of Azisper Pb821.

(2) Preparation of binder A binder composition was prepared in the same manner as in Example 1.

(3) Preparation of inkjet ink The above-prepared PR254 pigment dispersion, PR177 pigment dispersion, PG36 pigment dispersion, PY150 pigment dispersion, PB15: 6 pigment dispersion, PV23 pigment dispersion with the blending ratio shown in Table 2 And the binder composition were mixed thoroughly to prepare an inkjet ink.
(4) Formation of coating film In Comparative Examples 1 to 4 and Comparative Examples 7 to 12, the formation of the coating film by the spin coating method and the formation of the coating film by the ink jet method were performed in the same manner as in Example 1. In Comparative Example 5, a coating film was formed by a spin coating method and a coating film was formed by an inkjet method in the same manner as in Example 1 except that the film thickness of the black matrix was 1.2 μm. Further, in Comparative Example 6, a coating film was formed by a spin coating method and a coating film was formed by an inkjet method in the same manner as in Example 1 except that the thickness of the black matrix was 3.2 μm.

[Evaluation]
The following evaluation was performed about the obtained color filter. The evaluation results are also shown in Table 2.
1. Average ratio of pixel thickness, thickness distribution, and ratio of total area of 1.5 μm or less and 2.5 μm or more Pixel average film thickness, film thickness distribution, and film thickness in one pixel are 1.5 μm or less and 2 The ratio of the total area of the region of 5 μm or more was measured using, for example, an optical interference type three-dimensional non-contact surface shape measuring device (product name Micromap 557N, manufactured by Micromap, USA).
As the average film thickness (μm) of the pixels, the film thickness of all areas of the pixel formation region was obtained every 1 μm, and the average of them was obtained. As the film thickness distribution (μm) of the pixel, the film thickness distribution of the pixel formation region was obtained.

The total ratio R of the areas of the regions having a film thickness of 1.5 μm or less and 2.5 μm or more in one pixel was obtained from the following formula.
R (%) = (n ₁ + n ₂ ) / n ₀ × 100
(Where n ₁ is the number of measurement points with a film thickness of 1.5 μm or less, n ₂ is the number of measurement points with a film thickness of 2.5 μm or more, and n ₀ is the number of measurement points in the entire area of the pixel formation region. Means number.)

Incidentally, the film thickness the ratio R ₁ of the area of the following areas 1.5μm was obtained by the following equation during one pixel.
R ₁ (%) = n ₁ / n ₀ × 100
(However, n ₁ is the number of measurement points equal to or less than the thickness of 1.5 [mu] m, n ₀ denotes the number of measurement points of all the areas of the pixel forming region.)
Further, the area ratio R ₂ of the region having a film thickness of 2.5 μm or more in one pixel was obtained from the following formula.
R ₂ (%) = n ₂ / n ₀ × 100
(However, n ₂ means the number of measurement points with a film thickness of 2.5 μm or more, and n ₀ means the number of measurement points in all areas of the pixel formation region.)

2. Chromaticity (x, y), luminance Y, luminance loss Of the pixel region of the color filter obtained in the example, a wide-area spectroscopic device (trade name “Shimadzu”) is used for a range of 1600 μm in the line direction and 200 μm in the direction perpendicular to the line. From the result of spectral transmission spectrum measurement in the visible wavelength region (400 to 700 nm) with a sample detection area width of 4 mm and height of 11 mm using a self-recording spectrophotometer UV-3100PC (manufactured by Shimadzu Corporation), an inkjet method The chromaticity (x ₁ , y ₁ ) of the measurement target color filter (IJ-CF) obtained by the above, the luminance Y _1, and the chromaticity (x _{2 of} the color filter (SPIN-CF) obtained by the spin coating method) , Y ₂ ) and luminance Y ₂ were calculated.
Further, the luminance loss ΔY (%) was obtained from the following formula.
ΔY (%) = (Y ₂ −Y ₁ ) / Y ₂ × 100
When ΔY (%) ≦ 5, the luminance is comparable to that of a color filter having a pixel thickness obtained by a photolithography method having an average film thickness that provides sufficient color characteristics and a substantially uniform thickness. Judged.

3. Film properties (solvent resistance (chemical resistance))
The color difference ΔEab before and after the obtained color filter was immersed in N-methylpyrrolidone (NMP) at a liquid temperature of 40 ° C. for 1 hour was measured. The color difference was determined by the ΔEab color difference formula established in 1976 by the CIE (International Commission on Illumination). Actual measurement was performed with a microspectrophotometer (OSP-SP100, manufactured by Olympus Optical Co., Ltd.).
Further, the color difference ΔEab before and after the obtained color filter was immersed in isopropyl alcohol (IPA) at a liquid temperature of 60 ° C. for 1 hour was measured to obtain the color difference ΔEab.
A film with good film properties was marked with ◯, and a film with insufficient properties was marked with x. Judgment criteria are as follows.
<Criteria>
When ΔEab before and after immersion in IPA and NMP is 3 or less: ○
When one or both of IPA and ΔEab before and after immersion in NMP exceed 3, ×

4). Patterning For color filters with pixels, check the color mixture of adjacent pixels with a microscope. Those with good patterning properties were marked with ◯, and those with insufficient patterning were marked with ×. Judgment criteria are as follows.
<Criteria>
When a breakdown occurs: ×
If no breakdown occurred: ○

<Summary of results>

The color filter by the inkjet method according to the present invention obtained in Examples 1 to 4 has a film thickness distribution and a ratio of the total area of the regions having a film thickness of 1.5 μm or less and 2.5 μm or more. Therefore, the pixel shape is almost flat and the luminance loss is small, so that it has an average film thickness that can provide sufficient color characteristics and can be obtained by a spin coating method with a substantially uniform thickness. The decrease in luminance is small compared to a color filter having pixels. Furthermore, film physical properties and patterning properties are also good.
The inkjet color filter of Example 4 using an inkjet ink to which a leveling agent was further added to the inkjet ink of Example 1 was excellent in that the luminance loss of Example 1 was smaller.

On the other hand, the P / V ratio of the ink is smaller than the range of the present invention, and the average film thickness exceeds the range of the present invention. The red color filter by the ink jet method obtained in Comparative Examples 1 and 2 has a film thickness distribution. Is distributed in a region larger than 3.0 μm, and the ratio of the total area of the regions where the film thickness in one pixel is 1.5 μm or less and 2.5 μm or more is high, and the flatness of the pixel is poor. In addition, the brightness was significantly reduced as compared with the color filter formed by the spin coating method. Further, in Comparative Example 1, the breakdown occurred when attempting to pattern a desired color density.
The red color filter according to the inkjet method obtained in Comparative Examples 3 and 4 in which the P / V ratio of the ink is larger than the range of the present invention has a distribution in a region where the film thickness distribution is less than 1.0 μm, and is in one pixel. The ratio of the total area of the regions having a film thickness of 1.5 μm or less and 2.5 μm or more was high, and the flatness of the pixels was poor. In addition, the brightness was significantly reduced as compared with the color filter formed by the spin coating method. Further, in Comparative Example 4, the film physical properties were also poor.

The ink used and the average film thickness were the same as those in Example 1, but the red color filter by the inkjet method obtained in Comparative Example 5 in which the height of the black matrix layer was less than 2.0 μm had a film thickness distribution of 1. It has a distribution in the region of less than 0 μm and more than 3.0 μm, the film thickness near the edge of the pixel is greatly reduced, and the central part is raised, and the brightness is reduced compared to the color filter by spin coating method. It was extremely authoritative.
The ink used and the average film thickness were the same as in Example 1, but the red color filter by the inkjet method obtained in Comparative Example 6 in which the height of the black matrix layer exceeded 3.0 μm had a film thickness of 1.5 μm. The total ratio of the area of the region below and 2.5 μm or higher was high, and the flatness of the pixel was poor. In addition, a decrease in luminance was observed compared to a color filter formed by spin coating.

Ink used in Comparative Examples 7 and 8 where the ink used, the average film thickness and the height of the black matrix layer were the same as in Example 1, but the lower limit of the range of the film thickness distribution was smaller than the range of the present invention. In the red color filter, the total ratio of the areas of the film thicknesses of 1.5 μm or less and 2.5 μm or more was high, and the flatness of the pixels was poor. In addition, a decrease in luminance was observed compared to a color filter formed by spin coating.
Ink used in Comparative Examples 9 and 10 in which the ink used, the average film thickness and the height of the black matrix layer were the same as in Example 2, but the lower limit of the film thickness distribution range was smaller than the range of the present invention In the green color filter, the total ratio of the areas of the film thicknesses of 1.5 μm or less and 2.5 μm or more was high, and the flatness of the pixels was poor. In addition, a decrease in luminance was observed compared to a color filter formed by spin coating.
Ink used in Comparative Examples 11 and 12 where the ink used, the average film thickness and the height of the black matrix layer are the same as in Example 3, but the lower limit of the range of film thickness distribution is smaller than the range of the present invention In the green color filter, the total ratio of the areas of the film thicknesses of 1.5 μm or less and 2.5 μm or more was high, and the flatness of the pixels was poor. In addition, a decrease in luminance was observed compared to a color filter formed by spin coating.

It is typical sectional drawing about an example of a liquid crystal panel. It is typical sectional drawing about another example of a liquid crystal panel. It is a figure explaining the process of forming an ink layer and the process of forming a pixel by an inkjet system among the manufacturing methods of the color filter of this invention. It is a figure explaining an example of the method of manufacturing a color filter using the inkjet ink of this invention. It is a typical longitudinal cross-sectional view of an example of the pixel of the color filter of this invention. It is a typical longitudinal section showing an example of a color filter concerning the present invention. It is a typical longitudinal section showing an example of the color filter for evaluation concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color filter 2 Electrode substrate 3 Gap part 4 Sealing material 5 Transparent substrate 6 Black matrix layer 7 (7R, 7G, 7B) Pixel 8 Protective film 9 Transparent electrode film 10 Orientation film 11 Pearl 12 Columnar spacer 20 Ink repellent partition 21 Pixel Formation area 22 Inkjet head 23 Ink layer 24 Pixel portion 31 Pixel 32 Outer edge portion 33 Near outer edge portion 34 Small thickness portion 35 Maximum thickness portion 36 Black matrix 101, 102 Color liquid crystal display device 103, 104 Color filter

Claims (10)

It contains a pigment, a pigment dispersant, a binder forming system, and a solvent. The solvent has a solvent component having a boiling point of 180 ° C. to 260 ° C. and a vapor pressure at room temperature of 0.5 mmHg or less as a main solvent with respect to the total amount of the solvent. When the R pixel is formed, the ratio (P / V ratio) of the pigment weight and the sum of the weight of the pigment dispersant and the binder forming system is 0.5 to 1 in a ratio of 60% by weight or more. 0.0, 0.5 to 1.2 when the G pixel is formed, 0.3 to 0.5 when the B pixel is formed, and the solid concentration with respect to the total weight of the ink is 15% by weight to 25%. A step (A) of preparing an ink-jet ink for a color filter, which is% by weight;
The R pixel forming ink, the G pixel forming ink, and the B pixel forming ink obtained in the step (A) are selectively attached to a predetermined region on the transparent substrate by the inkjet method, and the R ink layer, G A step (B) of forming an ink layer and a B ink layer, and
Each ink layer is cured to have an average film thickness of 1.5 μm to 2.5 μm, a film thickness distribution in the range of 1.0 μm to 3.0 μm, and a film thickness in one pixel of 1.5 μm or less. And a step (C) of forming an R pixel, a G pixel, and a B pixel each having a total area ratio of 5% or less in a region of 2.5 μm or more
A method for producing a color filter, comprising:   The method for producing a color filter according to claim 1, wherein the pigment dispersant contains a polyethylimine derivative or a polyallylamine derivative.   The color filter manufacturing method according to claim 1, wherein each of the pixels has a film thickness distribution in a range of 1.5 μm to 2.5 μm.   The manufacturing method of the color filter in any one of Claims 1 thru | or 3 which has a black matrix layer whose height is 2.0 micrometers-3.0 micrometers on the said transparent substrate.   The method for producing a color filter according to claim 1, wherein the inkjet ink for a color filter contains a leveling agent.   The method for producing a color filter according to claim 5, wherein the leveling agent is added after the pigment dispersion step.   It includes at least a transparent substrate and pixels containing a pigment, a pigment dispersant, and a binder formed on the transparent substrate, and each pixel has an average film thickness of 1.5 μm to 2.5 μm and a film thickness distribution. A color filter having a range of 1.0 μm to 3.0 μm and a total area ratio of a region having a film thickness of 1.5 μm or less and 2.5 μm or more in one pixel of 5% or less.   The color filter according to claim 7, wherein each of the pixels has a film thickness distribution in a range of 1.5 μm to 2.5 μm.   The color filter of Claim 7 or 8 which has a black matrix layer whose height is 2.0 micrometers-3.0 micrometers on the said transparent substrate.   The color filter according to claim 7, wherein the pixel contains a leveling agent.

Images