JP2002201387A - Ink-jet ink composition for color filter, method for producing ink composition, and method for producing color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink-jet ink composition for color filters hard to thicken on the tip of an ink-jet head, and accurately and evenly adherable to only an ink layer-forming area when the area is formed by partially varying the wettability of the surface of a substrate. SOLUTION: This ink-jet ink composition is characterized by containing >=90 wt.%, based on the total solvent, of a solvent component as the main solvent 180-260 deg.C in boiling point and <=0.5 mmHg in vapor pressure at normal temperatures; wherein the above main solvent gives a contact angle of >=25 deg. for a test piece with a critical surface tension of 30 mN/m and <=10 deg. for a test piece with a critical surface tension of 70 mN/m. Thus, this ink-jet ink composition is allowed to adhere accurately and evenly to an area where the ink affinity of a wettability-variable layer is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink-jet ink composition used for forming a cured layer having a predetermined pattern such as a pixel portion (colored layer) on a color filter substrate, and the ink-jet ink composition. The present invention relates to a method for producing a product and a method for producing a color filter using the ink composition for inkjet.

[0002]

2. Description of the Related Art In recent years, with the development of personal computers, especially portable personal computers, the demand for liquid crystal displays, especially color liquid crystal displays, has been increasing. However, since the color liquid crystal display is expensive, there is an increasing demand for cost reduction, and in particular, there is a high demand for cost reduction for color filters having high specific gravity.

Such a color filter usually has three primary color patterns of red (R), green (G), and blue (B), and has electrodes corresponding to respective pixels of R, G, and B. Is turned on and off, the liquid crystal operates as a shutter, and light passes through each pixel of R, G, and B to perform color display.

A conventional color filter manufacturing method includes, for example, a dyeing method. In this dyeing method, first, a water-soluble polymer material, which is a material for dyeing, is formed on a glass substrate, and this is patterned into a desired shape by a photolithography process, and the obtained pattern is immersed in a dyeing bath. To obtain a colored pattern. This is repeated three times to form R, G, and B color filter layers.

Another method is a pigment dispersion method. In this method, first, a photosensitive resin layer in which a pigment is dispersed is formed on a substrate, and a monochromatic pattern is obtained by patterning the photosensitive resin layer. This process is further repeated three times to form R, G, and B color filter layers.

Still other methods include an electrodeposition method and a method of dispersing a pigment in a thermosetting resin, performing R, G, and B printing three times, and then thermosetting the resin. it can.

[0007] However, in each method, R, G,
In order to color the three colors B and B, it is necessary to repeat the same process three times, resulting in a problem that the cost is increased and a problem that the yield is reduced by repeating the same process.

As a method of manufacturing a color filter which solves these problems, there has been proposed a method of forming a colored layer (pixel portion) by spraying ink on a substrate surface by an ink jet method (Japanese Patent Laid-Open No. 59-75205). Gazette).

In order to form pixels by spraying ink in an accurate pattern in an ink jet system, straightness and stability when discharging from a discharge head are required. However, if the ink evaporation speed is too fast, the viscosity of the ink increases sharply at the nozzle tip of the discharge head, causing a flight deflection of the ink droplet, or clogging when the ink is intermittently discharged after a certain time. Re-discharge may not be possible.

Furthermore, the orifice surface 14 of the head 14
If the ink spreads over the area a, the ink droplets 15 ejected in the front direction Vx are pulled in the ink spreading direction Vy as shown in FIG.
Therefore, the spread of the ink on the surface of the orifice further deteriorates the straightness of the ejection.

In addition, when the colored ink is sprayed on the substrate by the ink jet method, if the drying speed is too high, the surface of the ink layer is solidified in a wavy or inclined state immediately after ejection, resulting in insufficient leveling. On the other hand, if the drying rate is too slow, it is difficult to dry completely by the heating process, or even if the drying is possible, the efficiency is poor. Therefore, in consideration of the ejection performance alone, it is sufficient to use ink that is difficult to dry, but in order to completely dry the ink layer, appropriate drying properties are also required.

A pigment is often used as a colorant for a color filter. However, if the color filter ink has poor pigment dispersibility, clogging of pigment particles causes clogging at a nozzle portion of a discharge head. Therefore, when a pigment is used as the colorant, the dispersibility of the pigment also affects the ink ejection performance.

JP-A-11-202144 discloses a filter ink containing a solvent having a boiling point of 150 ° C. to 250 ° C. in a proportion of 60% by weight or more and containing one or more of glycerin, diethylene glycol or ethylene glycol as a wetting agent. Have been. Since the ink disclosed in this publication contains a wetting agent, it is difficult for the ink to dry at the nozzle end of the discharge head and to cause clogging.

JP-A-2000-310706 discloses a resin composition for an ink-jet type color filter containing a colorant, a binder resin, and a solvent having a boiling point of 250 ° C. or more at normal pressure. Since the resin composition for an ink jet type color filter disclosed in this publication uses a solvent having a high boiling point, the ink hardly dries at the nozzle tip of the discharge head and does not easily become clogged.

However, after the inks disclosed in these publications are ejected onto a substrate, in the process of drying the ink layer, a humectant or a high-boiling-point solvent that is difficult to dry remains until the end, so that the ink layer may be completely dried. It will be difficult.

[0016]

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the above circumstances, and a first object of the invention is to provide an ink-jet ink composition for a color filter which is excellent in straightness and stability when discharged from a head. To provide things.

A second object of the present invention is to provide an ink-jet ink for a color filter which can be deposited in a pattern by utilizing the difference in wettability with respect to the substrate surface and is excellent in straightness and stability at the time of ejection. It is to provide a composition.

Further, a third object of the present invention is to provide a method for producing a color filter using an ink composition which achieves the above object.

[0019]

The ink-jet ink composition for a color filter according to the present invention comprises at least a binder component, a pigment, and a solvent, and has a boiling point of 180 to 260 ° C. as a main solvent at room temperature. Pressure is 0.
A solvent component of 5 mmHg or less is contained in a proportion of 90% by weight or more based on the total amount of the solvent.

The boiling point is 180 ° C. to 260 ° C. and the vapor pressure at room temperature (particularly in the range of 18 ° C. to 25 ° C.) is 0.5 mmHg.
The following solvent components have appropriate drying and evaporating properties. Therefore, if a solvent containing such a solvent component in a high blending ratio is used, the ink does not dry rapidly at the nozzle tip of the discharge head, so that the viscosity of the ink does not suddenly increase and clogging does not occur. Excellent quantity stability.

Accordingly, by using the ink composition of the present invention and discharging the ink composition according to a predetermined pattern onto the substrate surface by an ink-jet method, a colored cured layer such as a pixel portion or a light-shielding portion can be formed accurately and uniformly. .

The ink-jet ink composition for a color filter according to the present invention does not dry rapidly at the nozzle tip of the ink-jet head, but has an appropriate drying property. Therefore, after being discharged onto the substrate, it can be completely dried in a relatively short time by natural drying or a general heating method after it has been applied to the substrate surface and sufficiently leveled. Therefore, a highly uniform pattern can be obtained and drying can be performed efficiently.

Further, by selectively changing the wettability in a predetermined area of the substrate surface, an ink layer forming area having greater ink affinity than the surrounding area is formed, and the ink composition according to the present invention is ink-jetted there. When sprayed by the method, a certain amount of ink droplets are ejected at the correct position, and the landed ink droplets spread to every corner of the ink layer formation area without staying at the landing position, and the surrounding ink repellency The ink drops swell without protruding from the boundary with the area. Therefore, a thick colored hardened layer can be accurately formed, and, for example, a pixel portion with no color loss and high transmission density can be obtained.

In particular, a wettability variable layer that changes the wettability in a direction in which the ink affinity increases by the action of the photocatalyst is provided on the substrate, and the wettability variable layer is exposed in a predetermined pattern to form the ink affinity. When the ink layer forming region is formed, 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 from the contact of the droplet is measured. And the critical surface tension determined by the graph of the Zisman plot is 30 mN.
/ M shows a contact angle of 25 ° or more with the surface of the test piece, and the critical surface tension obtained by the same measurement method is 70 °.
It is preferable to use an ink composition prepared using an ink composition having a contact angle of 10 ° or less with respect to the surface of a test piece of mN / m, and accurate and uniform pattern efficiency can be obtained.

According to the ink composition and the method for producing a color filter according to the present invention, a color filter having good performance can be produced. Can be formed.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The inkjet ink composition for a color filter according to the present invention comprises at least a binder component, a pigment, and a solvent, and has a boiling point of 180 ° C to 26 ° C as a main solvent.
It contains a solvent component having a vapor pressure of 0.5 mmHg or less at 0 ° C. and ordinary temperature (particularly in the range of 18 ° C. to 25 ° C.) in a proportion of 90% by weight or more based on the total amount of the solvent.

(Binder system) As the binder system,
It is also possible to use a binder system which is simply dried and solidified, which is composed of only a resin having no polymerization reactivity. However, in order to impart sufficient strength, durability, and adhesion to the coating film, after forming a pattern of the ink layer (coating film) on the substrate by an inkjet method, the ink layer is cured by a polymerization reaction. It is preferable to use a binder system that can be used, for example, a visible light beam, an ultraviolet ray, a photocurable or ionizing radiation curable binder system that can be polymerized and cured by an electron beam, or the like, and can be polymerized and cured by heating. Polymerizable and curable binder systems, such as thermosetting binder systems, can be used.

(1) Ionizing radiation-curable binder system When using an ionizing radiation-curable binder system which can be polymerized and cured by ultraviolet rays, electron beams, etc., a resin having no polymerization reactivity per se is used as a binder component. Any of resins having polymerization reactivity per se may be used, and two or more kinds of binders may be used in combination. Then, the binder component is mainly used, and if necessary, a polyfunctional monomer or oligomer, a monofunctional monomer or oligomer, a photopolymerization initiator activated by ionizing radiation, and a sensitizer are blended, and ionization is performed. Constructs a radiation curable binder system.

When a resin having no polymerization reactivity is used as a binder component, a polyfunctional polymerizable component such as a bifunctional or higher polyfunctional monomer or oligomer is blended with the binder system. In this case, in the binder system, the polyfunctional polymerizable component itself polymerizes spontaneously by irradiation with ionizing radiation, or the action of another component such as a photopolymerization initiator activated by irradiation with ionizing radiation. To form a network structure in the coating film, and components such as a binder component and a pigment are wrapped in the network structure and cured.

[0030] Such non-polymerizable binders include:
For example, copolymers of two or more of the following monomers can be used: acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, Styrene, polystyrene macromonomer, and polymethyl methacrylate 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 / Examples thereof include a styrene macromonomer copolymer.

The resin itself having polymerization reactivity is an oligomer obtained by introducing a polymerizable functional group into a molecule of a non-polymerizable binder, or a polymer having a molecular weight larger than that of the oligomer, which is irradiated with ionizing radiation. In addition, it is possible to use a substance which itself produces a polymerization reaction or induces a polymerization reaction by the action of another component such as a photopolymerization initiator activated by irradiation with ionizing radiation.

Various ethylenic double bond-containing compounds include:
It itself has polymerization reactivity and can be used as a polymerizable binder component. Conventionally, a prepolymer blended in a UV-curable resin composition used in various fields such as inks, paints and adhesives can be used as a binder component in the present invention. Conventionally known prepolymers include radical polymerization type prepolymers, cationic polymerization type prepolymers, and thiol-ene addition type prepolymers, and any of them may be used.

Among them, the radical polymerization type prepolymers are most easily available on the market, for example, ester acrylates, ether acrylates, urethane acrylates, epoxy acrylates, amino resin acrylates, acrylic resin acrylates, Examples thereof include unsaturated polyesters.

The molecular weight of the ethylenic double bond-containing compound used as the binder component is determined by the weight average molecular weight so that the viscosity of the ink composition according to the present invention is not so high as to adversely affect the dischargeability from the discharge head. 25,000
It is preferably 0 or less.

The binder component is usually blended at a ratio of 1 to 50% by weight based on the total solid content of the ink composition. Here, the solid content of the ink composition for specifying the blending ratio includes all components except for the solvent, and the liquid polymerizable monomer and the like are also included in the solid content.

Even when a binder component capable of polymerizing and curing itself is used, a polyfunctional polymerizable component such as a polyfunctional monomer or oligomer is blended in order to improve the strength of the coating film and the adhesion to the substrate. Is preferred. The molecules of the polymerizable binder component not only polymerize with each other but also polymerize with other polymerizable components such as a polyfunctional monomer to form a network and cure.

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 ionizing radiation-curable resin, usually, a monomer or oligomer having four or more functional groups is used. However, when a multifunctional polymerizable component having a large number of functional groups is blended into the ink composition and sprayed onto the substrate by an inkjet method, the ink dries at the tip of the inkjet head during the spraying operation and the viscosity gradually increases. As the size increases, the ink discharge performance deteriorates.

Therefore, as the polymerizable component other than the binder component, it is preferable to use a difunctional or trifunctional monomer or oligomer having a relatively small number of functional groups, particularly a monomer as a main component, and to have a viscosity of 2 to 3 having a viscosity of 100 cps or less.
It is particularly preferred to use a functional monomer.

Examples of the bifunctional or trifunctional monomer include 1,6-hexanediol diacrylate, ethylene glycol dimethacrylate, 1,4-butanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, Examples include polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, and 3-butylene glycol dimethacrylate.

The use of the bifunctional or trifunctional monomer makes it difficult for the viscosity at the tip of the head to increase during the spraying operation of the ink jet system, and does not cause clogging of the head, thereby improving the ink discharge property during the operation. Stabilize. Therefore, the ejection amount and the ejection direction of the ink are stabilized, and the ink can be accurately and uniformly adhered to the substrate in a predetermined pattern.

The proportion of the difunctional or trifunctional monomer is usually 20 to 70% by weight based on the total solid content of the ink composition.

If the proportion of the bifunctional or trifunctional monomer is less than 20% by weight of the total solids, the ink composition is not sufficiently diluted by the monomer and the viscosity of the ink is high from the beginning or It becomes high after the evaporation of the solvent,
The nozzles of the inkjet head may be clogged. When the blending ratio of the bifunctional or trifunctional monomer exceeds 70% by weight of the total solids, the crosslink density of the coating film is low, and the solvent resistance, adhesion, and hardness of the coating film are poor, and the coating film is insufficient. Characteristics may not be obtained.

However, when the polyfunctional monomers contained in the ink composition are all difunctional or trifunctional monomers, the viscosity of the ink hardly increases due to drying of the ink. ,On the other hand,
In some cases, the cured layer obtained by curing the ink layer has insufficient film strength, adhesion to a substrate, and solvent resistance. Accordingly, by adding an appropriate amount of a polyfunctional monomer or oligomer having 4 or more functional groups together with the above-described bifunctional or trifunctional monomer, the crosslink density can be increased, and sufficient film strength and adhesion can be imparted to the pattern of the cured layer. .

As the tetrafunctional monomer or oligomer,
For example, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexamethacrylate and the like can be exemplified.

The polyfunctional component having four or more functional groups is usually blended at a ratio of 1 to 30% by weight based on the total solid content of the ink composition. Further, in order to balance the stabilization of the ejection property by the di- or tri-functional monomer and the improvement of the strength and the adhesion by the poly-functional component having four or more functional groups, the tetra-functional monomer is used in 100 parts by weight. The compounding ratio of the above polyfunctional component is usually 1 to 50 parts by weight, preferably the lower limit of the compounding ratio is 2 parts by weight or more, and / or the upper limit of the compounding ratio is 35 parts by weight or less.

Here, when the compounding ratio of the polyfunctional component having four or more functional groups is less than 1 part by weight based on 100 parts by weight of the difunctional or trifunctional monomer, the hardness after curing of the ink, Properties such as solvent resistance may not be sufficiently obtained. When the proportion of the polyfunctional component having four or more functional groups is more than 50 parts by weight, the curing speed of the ink may be low, and the process speed may be low.

The ionizing radiation-curable binder system may optionally contain a monofunctional monomer or oligomer.

Monofunctional monomers and oligomers include:
For example, vinyl monomers such as styrene and vinyl acetate,
Monofunctional acrylic monomers such as n-hexyl acrylate and phenoxyethyl acrylate can be exemplified.

The ionizing radiation-curable binder system usually contains 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 mode of the binder and the polyfunctional monomer (for example, radical polymerization and cationic polymerization) and the type of each material. For example, 1-hydroxycyclohexyl-phenyl ketone is used. 2,2-dimethoxy-1,2-diphenylethan-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, bisacylphosphine 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-dimethylaminobenzoic acid ethyl ester, p-dimethylaminobenzoic acid isoamyles 1,3,5-triacroylhexahydro-s-triazine, 2- [2- (5-methylfuran-2-yl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, Photopolymerization of 2- [2- (furan-2-yl) ethenyl] -4,6-bis (trichloromethyl) -s-triazine, methylbenzoylformate, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc. Initiators can be used.

(2) Thermosetting Binder System In the case of using a thermosetting binder system in the present invention, as a binder component, a resin having no thermopolymerizable functional group itself, and a thermopolymer binder itself are used. Any of resins having a functional functional group may be used, or two or more kinds of binders may be used in combination. Then, a thermosetting binder system is formed by blending a polyfunctional thermopolymerizable monomer or oligomer, a monofunctional thermopolymerizable monomer or oligomer, a curing agent, and the like, as needed, mainly with a binder component.

When a resin having no thermopolymerizable functional group is used as a binder component, a polyfunctional thermopolymerizable component such as a difunctional or higher functional thermopolymerizable monomer or oligomer is blended with the binder system. As the polyfunctional thermopolymerizable component, a polyfunctional epoxy compound is suitably used. In this case, in the binder system, the polyfunctional thermopolymerizable component is activated by heating, and the thermopolymerizable components polymerize to form a network structure in the coating film. Is wrapped and cured.

Examples of the resin having no thermopolymerizable functional group include:
For example, copolymers of two or more of the following monomers can be used: acrylic acid, methacrylic acid, methyl acrylate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, benzyl acrylate, benzyl methacrylate, Styrene, polystyrene macromonomer, and polymethyl methacrylate 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 / Examples thereof include a styrene macromonomer copolymer.

On the other hand, a resin having a thermopolymerizable functional group is used as a binder component, for example, a polymer obtained by polymerizing one or more monomers having an ethylenically unsaturated bond and an epoxy group as shown below. Polymers or copolymers can be used: glycidyl acrylate, glycidyl methacrylate, α-ethyl glycidyl acrylate, α
Glycidyl n-propyl acrylate, glycidyl α-n-butyl acrylate, 3,4-epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, 4,5-epoxypentyl methacrylate, acrylic acid-
(Meth) acrylates such as 6,7-epoxyheptyl, 6,7-epoxyheptyl methacrylate, and 6,7-epoxyheptyl α-ethylacrylate; o-vinylphenyl glycidyl ether, m-vinylphenyl glycidyl ether Vinyl glycidyl ethers such as p-vinylphenyl glycidyl ether, o-vinylbenzyl glycidyl ether, m-vinylbenzyl glycidyl ether and p-vinylbenzyl glycidyl ether; 2,3-diglycidyloxystyrene, 3,4-diglycidyl Oxystyrene, 2,4-diglycidyloxystyrene, 3,5-diglycidyloxystyrene,
2,6-diglycidyloxystyrene, 5-vinylpyrogallol triglycidyl ether, 4-vinylpyrogallol triglycidyl ether, vinylphloroglysinol triglycidyl ether, 2,3-dihydroxymethylstyrene diglycidyl ether, 3,4-dihydroxymethyl Styrene diglycidyl ether, 2,4-dihydroxymethylstyrene diglycidyl ether, 3,5
-Dihydroxymethylstyrene diglycidyl ether,
2,6-dihydroxymethylstyrene diglycidyl ether, 2,3,4-trihydroxymethylstyrene triglycidyl ether, and 1,3,5-trihydroxymethylstyrene triglycidyl ether.

Even when a resin having a thermopolymerizable functional group is used, it is preferable to add a polyfunctional thermopolymerizable component in order to improve the strength of the coating film and the adhesion to the substrate. The molecules of the thermopolymerizable binder component not only polymerize with each other but also thermally polymerize with other components such as a polyfunctional epoxy monomer to form a network and cure.

The binder component of the thermosetting binder is also usually 1 to 5 with respect to the total solid content of the ink composition.
It is blended at a ratio of 0% by weight. Here, the solid content of the ink composition for specifying the blending ratio includes all components except for the solvent, and the liquid polymerizable monomer and the like are also included in the solid content.

As the polyfunctional thermopolymerizable component forming the network structure of the coating film, a bifunctional or higher functional epoxy monomer or epoxy oligomer is preferably used. In particular,
By using a bifunctional or trifunctional epoxy group-containing monomer, the viscosity of the head at the tip of the head hardly increases during the spraying operation of the ink jet method, and the head is not clogged. Becomes stable. Therefore, the ejection amount and the ejection direction of the ink are kept constant, and the ink can be accurately and uniformly adhered to the substrate in a predetermined pattern.

Examples of difunctional or trifunctional epoxy group-containing monomers include polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether,
Trimethylolpropane polyglycidyl ether, 2,
3-diglycidyloxystyrene, 3,4-diglycidyloxystyrene, 2,4-diglycidyloxystyrene, 3,5-diglycidyloxystyrene, 2,6-diglycidyloxystyrene, 5-vinylpyrogallol triglycidyl ether 4-vinylpyrogallol triglycidyl ether, vinylphloroglysinol triglycidyl ether, 2,3-dihydroxymethylstyrene diglycidyl ether, 3,4-dihydroxymethylstyrene diglycidyl ether, 2,4-dihydroxymethylstyrene diglycidyl ether, 3,5-dihydroxymethylstyrene diglycidyl ether, 2,6-dihydroxymethylstyrene diglycidyl ether, 2,
Examples thereof include 3,4-trihydroxymethylstyrene triglycidyl ether and 1,3,5-trihydroxymethylstyrene triglycidyl ether. One of these can be used alone, or two or more can be used in combination. it can.

The mixing ratio of the bifunctional or trifunctional epoxy group-containing monomer is based on the total solid content of the ink composition.
Usually, it is blended at a ratio of 20 to 70% by weight.

Here, the mixing ratio of the difunctional or trifunctional epoxy group-containing monomer is determined by the total solid content (all components other than the solvent).
If less than 20% by weight of the ink composition, the ink composition is not sufficiently diluted with the monomer, and the viscosity of the ink is high from the beginning or increases after the solvent evaporates, which may cause clogging of the ink jet head. . Also, 2
When the compounding ratio of the functional to trifunctional epoxy group-containing monomer exceeds 70% by weight of the total solids, the crosslink density of the coating film becomes low, and the solvent resistance, adhesion and hardness of the coating film are poor,
Sufficient characteristics may not be obtained.

However, when the polyfunctional monomers to be incorporated in the ink composition are all bifunctional or trifunctional epoxy monomers, the viscosity of the ink hardly increases due to drying of the ink, so that the ejection property of the ink jet head is stable. On the other hand, the cured layer obtained by curing the ink layer may have insufficient film strength, adhesion to a substrate, solvent resistance, and the like. Therefore, by adding an appropriate amount of a polyfunctional epoxy monomer having 4 or more functional groups or a polyfunctional epoxy oligomer together with the above-described bifunctional or trifunctional epoxy monomer, the crosslink density is increased, and sufficient film strength and adhesiveness are obtained for the pattern of the cured layer. Can be provided.

Examples of the compound having four or more functional epoxy groups include novolak resins such as phenol novolak epoxy and cresol novolak epoxy; glycidylamine resins such as tetraglycidyl diaminodiphenylmethane and tetraglycidyl metaxylene diamine;
Glycidyl ether resins such as tetraphenyl glycidyl ether ethane and triphenyl glycidyl ether methane can be used.

The epoxy group-containing compound having four or more functional groups is usually blended at a ratio of 1 to 30% by weight based on the total solid content of the ink composition. Also, in order to balance the stabilization of the ejection property by the difunctional or trifunctional epoxy group-containing monomer and the improvement of the strength and adhesion by the tetrafunctional or more functional epoxy group-containing compound, 100 parts by weight of the bifunctional or trifunctional epoxy monomer is used. The compounding ratio of the epoxy group-containing compound having four or more functional groups is usually 1 to 50 parts by weight, preferably the lower limit of the compounding ratio is 2 parts by weight or more, and / or the upper limit of the compounding ratio is 35 parts by weight. Parts or less.

Here, the compounding ratio of the epoxy group-containing compound having four or more functional groups is the same as that of the bifunctional or trifunctional epoxy monomer 10
If the amount is less than 1 part by weight with respect to 0 part by weight, properties such as hardness and solvent resistance after curing of the ink may not be sufficiently obtained. Further, when the compounding ratio of the epoxy group-containing compound having four or more functional groups exceeds 50 parts by weight, the curing speed of the ink may be reduced, and the process speed may be reduced.

The thermosetting binder system may contain a monofunctional thermopolymerizable compound, if necessary.
As the monofunctional thermopolymerizable compound, a monofunctional epoxy group-containing monomer can be used. Examples of the monofunctional epoxy group-containing monomer include, for example, methyl glycidyl ether, butyl glycidyl ether, phenyl glycidyl ether, butyl phenyl glycidyl ether,
Examples include ethylhexyl glycidyl ether, decyl glycidyl ether, stearyl glycidyl ether, allyl glycidyl ether, polypropylene glycol glycidyl ether, and butoxy polyethylene glycol monoglycidyl ether. Examples of the thermosetting component other than the epoxy group-containing monomer include a melamine resin, a urea resin, an alkyd resin, a phenol resin, and a cyclopentadiene resin.

The thermosetting binder system usually contains a curing agent. As the curing agent, for example, a polycarboxylic anhydride or a polycarboxylic acid is used.

Specific examples of the polycarboxylic acid anhydride include:
Phthalic anhydride, itaconic anhydride, succinic anhydride, citraconic anhydride, dodecenyl succinic anhydride, tricarballylic anhydride, maleic anhydride, hexahydrophthalic anhydride,
Aliphatic or alicyclic dicarboxylic anhydrides such as dimethyltetrahydrophthalic anhydride, hymic anhydride and nadic anhydride; 1,2,3,4-butanetetracarboxylic dianhydride and cyclopentanetetracarboxylic dianhydride Aliphatic polycarboxylic acid dianhydrides; aromatic polycarboxylic acid anhydrides such as pyromellitic anhydride, trimellitic anhydride, benzophenone tetracarboxylic anhydride; ethylene glycol bis trimellitate, glycerin tristrimellitate, etc. And particularly preferably an aromatic polycarboxylic acid anhydride. Also, a commercially available epoxy resin curing agent composed of a carboxylic anhydride can be suitably used.

Specific examples of the polycarboxylic acid used in the present invention include aliphatic polycarboxylic acids such as succinic acid, glutaric acid, adipic acid, butanetetracarboxylic acid, maleic acid and itaconic acid; Phthalic 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, Examples thereof include aromatic polycarboxylic acids such as 1,4,5,8-naphthalenetetracarboxylic acid and benzophenonetetracarboxylic acid, and preferably include aromatic polycarboxylic acids.

These polycarboxylic anhydrides and polycarboxylic acids can be used alone 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 50 parts by weight, per 100 parts by weight of the component (monomer and resin) containing an epoxy group. If the amount of the curing agent is less than 1 part by weight, curing will be insufficient and a tough coating film cannot be formed. When the compounding amount of the curing agent is 100
If the amount is more than 10 parts by weight, the adhesion of the coating film to the substrate is poor, and a uniform and smooth coating film cannot be formed.

(Pigment) The ink composition according to the present invention comprises:
It is used to form a colored pattern such as a pixel portion or a light-shielding layer by spraying onto a substrate of a color filter by an ink jet method, and contains a pigment as a coloring agent. Pigments as colorants include R, G,
Any one of an organic colorant and an inorganic colorant can be selected and used in accordance with the required color such as B. As the organic colorant, for example, a dye, an organic pigment, a natural pigment, or the like can be used. Also, as the inorganic colorant,
For example, inorganic pigments, extender pigments and the like can be used.
Among these, the organic pigments are preferably used because they have high coloring properties and high heat resistance. Organic pigments include, for example, Color Index (CI; The Society of Dyers and
Compounds classified as Pigment in Colorists (published by Colourists, Inc.), specifically those having the following color index (CI) numbers.

CI Pigment Yellow 1, CI Pigment Yellow 3, CI Pigment Yellow 12, CI Pigment Yellow 13, CI Pigment Yellow 14, C.I.
I. Pigment Yellow 15 and CI Pigment Yellow 1
6, 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 9
7, CI Pigment Yellow 98, CI Pigment Yellow 100, CI Pigment Yellow 101, CI Pigment Yellow 104, CI Pigment Yellow 10
6, CI Pigment Yellow 108, CI Pigment Yellow 109, CI Pigment Yellow 110, CI Pigment Yellow 113, CI Pigment Yellow 11
4, CI Pigment Yellow 116, CI Pigment Yellow 117, CI Pigment Yellow 119, CI Pigment Yellow 120, CI Pigment Yellow 12
6, CI Pigment Yellow 127, CI Pigment Yellow 128, CI Pigment Yellow 129, CI Pigment Yellow 138, CI Pigment Yellow 13
9, CI Pigment Yellow 150, CI Pigment Yellow 151, CI Pigment Yellow 152, CI Pigment Yellow 153, CI Pigment Yellow 15
4, CI Pigment Yellow 155, CI Pigment Yellow 156, CI Pigment Yellow 166, CI Pigment Yellow 168, CI Pigment Yellow 17
5; 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 3
6, 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 Violet 32, CI Pigment Violet 3
6, CI 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, C.I.
I. Pigment Red 42 and 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 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 Pigment Red 97, C.I.
I. Pigment Red 101, CI Pigment Red 10
2, 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 1
23, 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 16
8, 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 177,
CI Pigment Red 178, CI Pigment Red 1
79, 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 19
4, 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 2
24, 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 26
4, CI Pigment Red 265; CI Pigment Blue 15, CI Pigment Blue 15: 3, CI Pigment Blue 15: 4, CI Pigment Blue 15: 6, C.I.
I. 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 or extender pigments include titanium oxide, barium sulfate, calcium carbonate, zinc white, lead sulfate, yellow lead, zinc yellow, red iron oxide (red iron (III) oxide) and cadmium red. , Ultramarine blue, navy blue, chromium oxide green, cobalt green, amber, titanium black, synthetic iron black, carbon black and the like. In the present invention, the pigments can be used alone or in combination of two or more.

When a pattern of a light-shielding layer is formed on the substrate of a color filter using the ink composition of the present invention, a black pigment having a high light-shielding property is mixed into the ink composition. As the black pigment having a high light-shielding property, for example, an inorganic colorant such as carbon black or iron tetroxide, or an organic colorant such as cyanine black can be used.

An ink layer formed of an ink composition containing a pigment having a high light-shielding property has difficulty in reaching light or ionizing radiation to the inside thereof. It is preferred to use a thermosetting binder system. However, it is possible to cure with light or ionizing radiation by adjusting the curing method such as increasing the thickness of the ink layer or the exposure time.

When the pixel portion is formed, the pigment is usually added in an amount of 1 to 60% by weight based on the total solid content of the ink composition.
Preferably, it is blended at a ratio of 15 to 40% by weight. If the amount of the pigment is too small, the ink composition is coated at a predetermined film thickness (usually, 0.1 to 0.5%).
(1 to 2.0 μm) may not have a sufficient transmission density. On the other hand, if the amount of the pigment is too large, the properties as a coating film such as the adhesion to the substrate and the hardness of the coating film when the ink composition is applied onto the substrate and cured may be insufficient.

(Dispersant) The dispersant is added to the ink composition as required to disperse the pigment well.
As the dispersing agent, for example, a cationic, anionic, nonionic, amphoteric, silicone, or fluorine-based surfactant can be used. Among the surfactants, polymer surfactants (polymer dispersants) as exemplified below are preferable.

That is, polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether and polyoxyethylene oleyl ether; polyoxyethylene alkyl such as polyoxyethylene octyl phenyl ether and polyoxyethylene nonyl phenyl ether Polymer surfactants such as phenyl ethers; polyethylene glycol diesters such as polyethylene glycol dilaurate and polyethylene glycol distearate; sorbitan fatty acid esters; fatty acid-modified polyesters; and tertiary amine-modified polyurethanes are preferably used.

(Solvent) The inkjet ink for a color filter according to the present invention has a boiling point of 180 ° C. to 260 ° C.
Preferably at 210 ° C. to 260 ° C. and normal temperature (particularly 18 ° C.
A solvent component having a vapor pressure of 0.5 mmHg or less, preferably 0.1 mmHg or less, as the main solvent, and such a main solvent is used in an amount of 90% by weight or more, preferably 90% by weight, based on the total amount of the solvent. It is blended in a proportion of 95% by weight or more.
Further, the surface tension of the main solvent is preferably 29 dyn / cm or more.

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 appropriate drying and evaporating properties. Therefore, when a single solvent or a mixed solvent containing such a solvent component in a high blending ratio is used, the ink does not rapidly dry at the nozzle tip of the discharge head, so that a sharp increase in viscosity and clogging of the ink do not occur, The straightness and stability of the ejection are not adversely affected. At the same time, since the drying proceeds at an appropriate speed after spraying on the surface to be ejected, the ink is adapted to the surface to be applied, and the surface of the coating film becomes horizontal and smooth. Thus, the ink can be dried quickly and completely. Compared with the case where a wetting agent or a solvent having an extremely high boiling point is used, there is less possibility that the solvent remains in the coating film after the drying step.

Since the ink composition of the present invention uses a pigment as a colorant, the pigment is previously mixed with a dispersant in a part of the total amount of the solvent to impart dispersibility, and the resulting pigment dispersion ( That is, in many cases, a high-concentration pigment dispersion) is added to the remaining solvent together with other components, and mixed to form an ink composition. In order to prepare a pigment dispersion, it is necessary to use a solvent that easily disperses the pigment, such as 3-methoxybutyl acetate or propylene glycol monomethyl ether acetate (PGMEA).

The solvent of the ink composition may contain a small amount of a solvent component other than the main solvent, if necessary, such as a dispersion solvent used for preparing a pigment dispersion. However, even in this case, it is necessary to use the main solvent having the above-mentioned boiling point and vapor pressure in a proportion of 90% by weight or more based on the total amount of the solvent. If the proportion of the main solvent is less than 90% by weight of the total amount of the solvent, it is impossible to reliably obtain the drying property and the evaporation property suitable for the ink jet system.

It is desirable that the main solvent be used in a proportion as high as possible, specifically, at least 90% by weight or more, preferably 95% by weight or more.
It is desirable that the content be% by weight. Therefore, it is preferable to select the main solvent appropriately and mix it with the dispersing solvent at the time of preparing the pigment dispersion, or use the main solvent as it is as the dispersing solvent.

By forming a variable wettability layer on the surface of the substrate and exposing it, an ink-philic region is formed on a portion of the substrate where an ink layer is to be formed, and the ink composition of the present invention is formed on the ink-philic region by an inkjet method. When a substance is selectively adhered, a standard solution shown in a wettability test specified in JIS K6768 is used as a main solvent, and a contact angle (θ) after 30 seconds from contacting the droplet is measured. The critical surface tension determined from the graph of the Zisman plot is 30.
a contact angle with respect to the surface of the mN / m test piece of 25 ° or more;
Preferably, a test piece having a contact angle with respect to the surface of a test piece having a surface angle of preferably 30 ° or more and having a critical surface tension of 70 mN / m determined by the same measurement method may be selected and used.

When the ink composition is prepared using a solvent exhibiting the above behavior with respect to wettability, the ink composition is applied to the surface of the variable wettability layer before changing the wettability of the variable wettability layer described later. It shows large repulsion, and after changing the wettability of the variable wettability layer so as to increase the hydrophilicity, shows a large affinity for the surface of the variable wettability layer. Therefore, the difference between the wettability of the ink composition 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 the surrounding region is increased. Will be able to
The ink composition sprayed onto the ink-philic region by an ink jet method uniformly spreads to all corners of the ink-philic region. As a result, a fine and precise pattern of the ink layer can be formed by the ink jet method.

Here, the test piece having the above-mentioned characteristics with respect to the critical surface tension may be made of any material. Examples of the test piece having a critical surface tension of 30 mN / m include, for example, polymethyl methacrylate having a smooth surface,
From the polyvinyl chloride, polyvinylidene chloride, polyethylene terephthalate, and the smooth glass surface coated with the polymer or the surface modifier, the above test is actually performed, and the applicable one can be selected. In addition, as the test piece having a critical surface tension of 70 mN / m, for example, a test piece which is actually subjected to the above test and selected from those coated with nylon or a glass surface which has been subjected to hydrophilization can be selected.

The main solvent can be selected from the following solvents and used: glycol ethers such as ethylene glycol monoethyl ether; glycol ether esters such as ethylene glycol monomethyl ether acetate; diethylene glycol monomethyl Glycol oligomer ethers such as ethers; glycol oligomer ether esters such as diethylene glycol monomethyl ether acetate;
Aliphatic carboxylic acids such as acetic acid, 2-ethylhexanoic acid and acetic anhydride or acid anhydrides thereof; aliphatic or aromatic esters such as ethyl acetate and propyl benzoate; dicarboxylic acid diesters such as diethyl carbonate; Alkoxycarboxylic esters such as methyl 3-methoxypropionate; Ketocarboxylic esters such as ethyl acetoacetate; Halogenated carboxylic acids such as chloroacetic acid and dichloroacetic acid; Alcohols such as ethanol, isopropanol and phenol; Phenols; aliphatic or aromatic ethers such as diethyl ether and anisole; 2-ethoxyethanol, 1-methoxy-2-
Alkoxy alcohols such as propanol; glycol oligomers such as diethylene glycol and tripropylene glycol; amino alcohols such as 2-diethylaminoethanol and triethanolamine; alkoxy alcohol esters such as 2-ethoxyethyl acetate; acetone; Ketones such as methyl isobutyl ketone; morpholines such as N-ethylmorpholine and phenylmorpholine; pentylamine;
Aliphatic or aromatic amines such as tripentylamine and aniline;

Specific examples of the solvent that can be used as the main solvent include ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, and malonic acid. Examples thereof include diethyl, dimethyl succinate, and diethyl succinate. These solvents are
The boiling point is 180 ° C. to 260 ° C. and the vapor pressure at room temperature is 0.
In addition to satisfying the requirement of 5 mmHg or less, the dispersibility and dispersion stability of the pigment are relatively good, and a conventional pigment dispersion such as 3-methoxybutyl acetate or propylene glycol monomethyl ether acetate (PGMEA) is used. A pigment dispersion can be prepared by mixing it with the solvent used in the preparation or using it as a dispersion solvent without mixing.

Further, for these solvents mentioned as specific examples, the standard solution shown in the wetting test specified in JIS K6768 was used, and the contact angle (θ) was measured 30 seconds after the droplet was brought into contact with the solvent. Of a test piece having a critical surface tension of 30 mN / m and a contact angle with respect to the surface of the test piece of 25 mN / m or more, and a critical surface tension of 70 mN / m obtained by the same measurement method. It also satisfies the requirement that the contact angle with the surface be less than 10 °. Therefore, these solvents are provided with a wettability variable layer on the substrate surface and exposed to light, and even when the ink composition is selectively adhered using the difference in wettability between exposed and unexposed portions, It can be suitably used as a main solvent.

As described above, the solvent of the ink composition according to the present invention contains the main solvent in a proportion of 90% by weight or more,
If necessary, another solvent component such as a dispersion solvent is blended. Such a solvent is usually added in an amount of 40 to 95% by weight based on the total amount of the ink composition containing the solvent.
To prepare a coating liquid of the ink composition. If the amount of the solvent is too small, the viscosity of the ink is high, and it becomes difficult to discharge the ink from the inkjet head. On the other hand, if the amount of the solvent is too large, the ink filling amount (ink deposition amount) with respect to the predetermined wettability change portion (ink layer forming portion) is not sufficient,
The ink film deposited on the wettability change site is broken,
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 formation site) where ink is to be adhered becomes insufficient, and the film thickness after drying is too thin. The transmission density cannot be obtained.

(Other Components) In the ink-jet ink composition for a color filter of the present invention, one or more other additives can be blended, if necessary. The following can be illustrated as such additives.

A) Sensitizers: for example, 4-diethylaminoacetophenone, 4-dimethylaminopropiophenone, ethyl-4-dimethylaminobenzoate, 2-ethylhexyl-1,4-dimethylaminobenzoate and the like.

B) Curing accelerator (chain transfer agent):
2-mercaptobenzimidazole, 2-mercaptobenzothiazole, 2-mercaptobenzoxazole,
2,5-dimercapto-1,3,4-thiadiazole, etc. c) Photocrosslinking agent or photosensitizer composed of a polymer compound: The polymer photocrosslinking / sensitizing agent is used as a photocrosslinking agent or a photosensitizer. A polymer compound having a functional group capable of functioning in the main chain and / or side chain, such as a condensate of 4-azidobenzaldehyde and polyvinyl alcohol,
Examples thereof include a condensate of azidobenzaldehyde and a phenol novolak resin, a (co) polymer of 4- (meth) acryloylphenylcinnamoyl ester, 1,4-polybutadiene, and 1,2-polybutadiene.

D) Dispersing aid: for example, blue pigment derivatives such as copper phthalocyanine derivatives and yellow pigment derivatives.

E) Filler: for example, glass, alumina and the like.

F) Adhesion promoter: for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane and the like.

G) Antioxidants: for example, 2,2-thiobis (4-methyl-6-t-butylphenol), 2,6
-Di-t-butylphenol and the like.

H) UV absorber: for example, 2- (3-t)
-Butyl-5-methyl-2-hydroxyphenyl) -5
-Chlorobenzotriazole, alkoxybenzophenone and the like.

I) Anticoagulant: For example, sodium polyacrylate or various surfactants.

(Production Method of Ink Composition) The ink jet ink composition for a color filter of the present invention comprises a binder component and a pigment, which are essential components, together with other components if necessary, and the above-mentioned main solvent. It may be manufactured by adding and mixing in a single solvent or a mixed solvent containing 90% by weight or more to dissolve or disperse a solid component.

However, when the pigment is directly introduced into the entire solvent together with the other components such as a binder component and mixed with stirring, the pigment cannot often be 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 a dispersant and sufficiently stirred by a dissolver or the like to prepare a pigment dispersion. Then, the obtained pigment dispersion, together with components other than the pigment, is put into a solvent substantially consisting of the main solvent or only the main solvent, and sufficiently stirred and mixed with a dissolver or the like to thereby form the ink according to the present invention. It can be a composition.

As the remaining solvent to be charged with the pigment dispersion, a solvent having a composition obtained by subtracting the solvent used in the preparation of the pigment dispersion from the final composition of the entire solvent was used, and diluted to the final concentration. To complete the ink composition. Alternatively, the pigment dispersion may be charged into a relatively small amount of the main solvent to prepare a high-concentration ink composition. The high-concentration ink composition can be stored as it is, diluted to the final concentration immediately before use, and used in an ink jet method.

In the present invention, in particular, the main solvent has a boiling point of 180 ° C. to 260 ° C. and a vapor pressure of 0.5 at room temperature.
Since the blending ratio of the solvent component of not more than mmHg needs to be 90% by weight or more of the entire solvent, it is conventionally used in preparing a pigment dispersion such as 3-methoxybutyl acetate or propylene glycol monomethyl ether acetate (PGMEA). In some cases, a sufficient amount of the used dispersing solvent cannot be used. In such a case, a solvent having relatively good dispersibility and dispersion stability of the pigment is selected from the solvents that can be used as the main solvent, and a mixture of the pigment and a conventionally used dispersant is used as the dispersant. Or the main solvent is used as it is as a dispersion solvent.

(Method for Producing a Color Filter) (1) First Method A desired pigment such as R, G, B or black is blended with the ink jet ink composition for a color filter according to the present invention, and a transparent substrate for the color filter is prepared. A colored cured layer such as a pixel portion or a light-shielding layer can be formed by selectively adhering and curing the upper predetermined region by an inkjet method.

An example of a method for manufacturing a color filter including such steps will be described below. First, FIG. 1 (A)
A transparent substrate 1 of a color filter is prepared as shown in FIG. The transparent substrate is not particularly limited as long as it has been conventionally used for a color filter. For example, transparent substrates having no flexibility such as quartz glass, Pyrex (registered trademark) glass, and synthetic quartz plates are used. A rigid material or a transparent flexible material having flexibility such as a transparent resin film or an optical resin plate can be used. Of these, Corning 7059 glass is a material having a low 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 glass. It is suitable for a color filter for a color liquid crystal display device according to the method. In the present invention, a transparent substrate is usually used, but a reflective substrate or a white colored substrate can also be used. Further, the substrate may be subjected to a surface treatment for the purpose of preventing alkali elution, imparting gas barrier properties, and the like, if necessary.

Next, as shown in FIG. 1B, a light-shielding portion 2 is formed in a region which is a boundary between pixel portions on one surface of the transparent substrate 1. The light-shielding portion 2 can be formed by forming a metal thin film of chromium or the like having a thickness of about 1000 to 2000 ° by a sputtering method, a vacuum evaporation method, or the like, and patterning the thin film. As this patterning method, an ordinary patterning method such as sputtering can be used.

The light-shielding portion 2 may be a layer in which light-shielding particles such as fine carbon particles, metal oxides, inorganic pigments, and organic pigments are contained in a resin binder. Examples of the resin binder used include one or a mixture of two or more resins such as polyimide resin, acrylic resin, epoxy resin, polyacrylamide, polyvinyl alcohol, gelatin, casein, and cellulose; photosensitive resin; A W emulsion type resin composition, for example, one obtained by emulsifying a reactive silicone can be used. As the thickness of such a resin light shielding portion,
It can be set within the range of 0.5 to 10 μm. As a method of patterning such a resin light shielding portion,
A commonly used method such as a photolithography method and a printing method can be used.

Next, as shown in FIG. 1C, an ink-repellent convex portion having a width smaller than that of the light shielding portion is formed at the center of the pattern of the light shielding portion in the width direction as necessary. The composition of such ink-repellent projections is not particularly limited as long as it is a resin composition having ink-repellency. It is not necessary to be particularly transparent, and it may be colored. For example, a material that is used for the light-shielding portion and does not include a black material can be used. Specifically, polyacrylamide, polyvinyl alcohol, gelatin,
Examples thereof include a composition in which one or more aqueous resins such as casein and cellulose are mixed, and a resin composition of an O / W emulsion type, for example, an emulsion of a reactive silicone. In the present invention, a photocurable resin is preferably used for reasons such as easy handling and easy curing. Further, since the ink repellent projections are preferably as strong as the ink repellency, the surface thereof may be treated with an ink repellent such as a silicone compound or a fluorine-containing compound.

The patterning of the ink-repellent convex portions 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 convex portion is preferably provided to some extent because it is provided to prevent the ink from being mixed when colored by the inkjet method as described above. In consideration of the overall flatness of the case, the thickness is preferably close to the thickness of the pixel portion. Specifically, it is preferably within a range of 0.1 to 2.0 μm, though it varies depending on the amount of ink to be sprayed.

Next, an ink composition for forming a pixel portion of each color according to the present invention is prepared. Then, as shown in FIG. 1 (D), on the surface of the transparent substrate 1, the pixel portion forming regions 4R, 4G, and 4B of the respective colors defined by the pattern of the light-shielding layer 2 are formed. The ink is sprayed by an inkjet method to form an ink layer. In the ink spraying step, the pixel portion forming ink hardly causes an increase in viscosity at the tip of the head 5 and can maintain good ejection properties. Therefore, the ink of the corresponding color can be accurately and uniformly adhered in the predetermined pixel portion forming region, and a pixel portion having a correct pattern without color unevenness or color omission can be formed. Further, since the ink for forming the pixel portion of each color can be simultaneously sprayed onto the substrate using a plurality of heads, the working efficiency can be improved as compared with the case where the pixel portion is formed for each color.

Next, as shown in FIG. 1E, the ink layers 6R, 6G and 6B of each color are cured. To cure the ink layer, ionizing radiation 7 depending on the type of binder system is used.
Irradiation or heating of some kind of energy ray such as.
After curing the ink layer, the ink layer is baked as necessary to form a pixel portion. The thickness of the pixel portion is usually 0.1 to 2.0 μm in consideration of optical characteristics and the like.
Degree.

Next, as shown in FIG. 1F, a protective layer 9 is formed on the side of the transparent substrate on which the pixel portions 8R, 8G, 8B are formed. The protective layer is provided to planarize the color filter and prevent components contained in the pixel portion and the like from being eluted into the liquid crystal layer of the liquid crystal display device. The thickness of the protective layer can be set in consideration of the light transmittance of the material used, the surface condition of the color filter, and the like.
It can be set in the range of 0.1 to 2.0 μm. The protective layer can be formed using, for example, a known transparent photosensitive resin, a two-component curable transparent resin, or the like having a light transmittance required for the transparent protective layer.

Thus, the color filter 101A is manufactured using the ink jet ink composition for a color filter according to the present invention. In this example, the pixel portion is formed by using the ink composition of the present invention. However, according to the inkjet method using the inkjet ink for a color filter according to the present invention, the light-shielding portion 2 and the like other than the pixel portion are desired. It can be formed in a pattern.

When the light-shielding portion 2 is desired to be formed, an ink for forming a light-shielding portion, which is an ink-jet ink composition for a color filter of the present invention and is blended with a light-shielding colorant such as a black pigment, is prepared. The ink for forming a part is selectively adhered to a predetermined area on the surface of the transparent substrate 1 by an ink jet method to form an ink layer in a predetermined pattern, and the ink layer is cured by a method such as irradiation with ionizing radiation. The light shielding portion can be formed by baking according to the above.

(2) Second Method By selectively changing the wettability in a predetermined area of the substrate surface of the color filter, an ink layer forming area having greater ink affinity than the surrounding area is formed. Forming a colored cured layer such as a pixel portion or a light-shielding portion by a method in which an ink composition according to the present invention is selectively adhered to a formation region by an inkjet method to form an ink layer, and the ink layer is cured. Can be.

Particularly, on the transparent substrate of the color filter,
Form a wettability variable layer that changes the wettability in the direction in which the ink affinity increases by the action of the photocatalyst, selectively change the wettability in a predetermined region on the surface of the wettability variable layer by exposure, and It is possible to form an ink layer formation region having greater ink affinity, and to selectively adhere the ink composition according to the present invention to the ink layer formation region by an inkjet method to form an ink layer. .

When such a variable wettability layer is provided on a substrate, a standard solution shown in a wettability test specified in JIS K6768 is used as a main solvent, and a contact is made after 30 seconds of contact with a droplet. The angle (θ) was measured, and the critical surface tension determined by the graph of the Zisman plot was 30 mN / m.
Shows a contact angle of 25 ° or more with the surface of the test piece, and the critical surface tension obtained by the same measurement method is 70 mN /
It is preferable to use an ink composition prepared using an ink composition having a contact angle of 10 ° or less with the surface of the test piece of m.

An example of the second method for producing a color filter will be described below. First, as shown in FIG.
A light-shielding portion 2 is formed in a region of a color filter which is a boundary between pixel portions on one surface side of a transparent substrate 1. Depending on the pattern of the light shielding portion, the pixel portion forming regions 4R, 4G, 4B
Is defined. As the transparent substrate 1, the same substrate as that used in the above-described first method can be used, and the same light shielding portion 2 as that in the first method can be provided.

Next, as shown in FIG. 2B, at least a part of the surface of the transparent substrate 1, particularly, in this example, a region including a pixel portion forming region, contains a photocatalyst containing a variable wettability layer. The layer 10 is formed in a solid pattern (solid pattern).

Next, as shown in FIG. 2C, the photocatalyst-containing layer 10 is exposed to light 13 through a photomask 11 to expose the photocatalyst-containing layer 10 to the ink-philic property of the pixel portion forming regions 4R, 4G, and 4B. Increase.

When the wettability of the pixel portion forming region of the variable wettability layer such as the photocatalyst-containing layer 10 is selectively changed to increase the ink affinity, the ink composition of the present invention is applied to the pixel portion forming region. It adheres easily and spreads uniformly, while it is strongly repelled and removed in the area around the pixel area, so that it is selectively and evenly adhered to the pixel area, resulting in accurate color A pixel portion without unevenness or color loss can be formed.

For the wettability variable layer used in the second method, the contact angle (θ) was measured 30 seconds after the droplet was brought into contact with the standard solution shown in the wetting test specified in JIS K6768. The critical surface tension obtained from the graph of the Zisman plot shows 20 to 50 mN / m before changing the wettability and 40 to 80 mN / m after changing the wettability. Is preferred.

When a wettability variable layer capable of changing the critical surface tension in this manner is used, the ink composition can be used in a pattern formation region such as a pixel formation region in which the wettability is changed to increase the ink affinity. And a very small contact angle, while showing a very large contact angle around the pattern forming region, so that the difference in wettability can be made very large.

In the case of performing exposure using the photomask 11, the width of the exposed portion 12 is made larger than the width of the pixel portion forming region 4 while securing an unexposed portion at the boundary between adjacent pixel portion forming regions. It is preferable to make it wider. By doing so, the corners of the pixel portion formation region 4 are sufficiently exposed, and the ink affinity increases, so that inconveniences such as color omission of the pixel portion do not occur. The photocatalyst containing layer 10 may be exposed in a predetermined pattern by another method such as photolithography by scanning with a laser beam without using a photomask. Also, the back side of the transparent substrate (the photocatalyst containing layer 1)
When exposure is performed from the side opposite to where 0 is provided),
Since the light shielding portion 2 functions as a photomask, a photomask is not required.

The light applied to the photocatalyst containing layer 10 may be a visible light or an invisible light as long as the light can activate the photocatalyst. Usually, light including ultraviolet light is used. As a light source containing such ultraviolet light,
For example, a mercury lamp, a metal halide lamp, a xenon lamp, and the like can be given. The wavelength of light used for this exposure can be set within a range of 400 nm or less, preferably 380 nm or less. The amount of light irradiation at the time of exposure increases the hydrophilicity of the exposed portion by the action of a photocatalyst. Irradiation amount necessary for the irradiation.

Examples of the wettability variable layer capable of changing the wettability in the direction in which the ink affinity increases include, for example,
a) a layer containing a photocatalyst such as the illustrated variable wettability layer 10 and the hydrophilicity of the variable wettability layer itself being increased by the action of the photocatalyst; and b) a layer below the variable wettability layer (transparent substrate side). A photocatalyst-containing layer, wherein the hydrophilicity of the wettability variable layer is increased by the action of a photocatalyst present in the photocatalyst-containing layer; c) a decomposable wettability variable layer comprising a photocatalyst and a binder decomposed by the action of the photocatalyst; The exposed portion of the decomposable wettability variable layer is decomposed and removed to expose a hydrophilic underlayer, for example, a transparent substrate, or d) decomposable wetting made of a binder decomposed by the action of a photocatalyst. A photocatalyst containing layer is provided below the variable property layer,
The underlayer having a hydrophilic property, for example, one in which the photocatalyst-containing layer or the like is exposed by exposing and decomposing the exposed portion of the degradable wettability variable layer by the action of the photocatalyst present in the photocatalyst-containing layer can be exemplified.

"Variable wettability layer capable of changing wettability in a direction to increase ink affinity" in the present invention
Is a laminate having a variable wettability layer provided on a substrate,
Any material may be used as long as it changes the wettability of the surface on which the wettability variable layer is formed in a direction in which the ink affinity increases.
As shown in b), not only the wettability variable layer itself increases the ink affinity, but also the wettability variable layer is decomposed and the ink-philic base is exposed as in the above examples c) and d). Things are also included in this.

Hereinafter, the types a) and b) will be described in detail.

A) Photocatalyst-containing layer whose hydrophilicity is increased As in the illustrated photocatalyst-containing layer 10, the photocatalyst-containing layer which itself functions as a variable wettability layer includes a photocatalyst and a binder as required. It is formed by dispersing in a solvent together with other additives to prepare a coating solution, applying the coating solution, and then proceeding with hydrolysis and polycondensation to firmly fix the photocatalyst in the binder.

Examples of the photocatalyst include titanium oxide (TiO ₂ ), zinc oxide (ZnO), and the like, which are known as optical semiconductors.
Tin oxide (SnO ₂ ), strontium titanate (Sr
TiO ₃ ), tungsten oxide (WO ₃ ), bismuth oxide (Bi ₂ O ₃ ), and iron oxide (Fe ₂ O ₃ ). Can be used.

The mechanism of action of the photocatalyst in the photocatalyst-containing layer is not necessarily clear, but the carrier generated by the irradiation of light is directly reacted with a nearby compound or activated by the presence of oxygen or water. Depending on the oxygen species,
It is thought that the chemical structure of the organic substance is changed, and the hydrophilicity is increased by, for example, oxidation or decomposition of an organic group or an additive that is a part of the binder.

In the present invention, titanium oxide is particularly preferably used because it has a high band gap energy, is chemically stable, has no toxicity, and is easily available. Titanium oxide includes anatase type and rutile type, and both can be used in the present invention, but anatase type titanium oxide is preferable. Anatase type titanium oxide has an excitation wavelength of 380 nm or less.

As such anatase type titanium oxide, for example, anatase type titania sol of peptized hydrochloric acid (STS-02 (average particle size: 7 nm) manufactured by Ishihara Sangyo Co., Ltd.)
ST-K01 manufactured by Ishihara Sangyo Co., Ltd., anatase titania sol of nitric acid peptization type (TA-15 (average particle size: 12 nm) manufactured by Nissan Chemical Industries, Ltd.) and the like can be mentioned.

The smaller the particle size of the photocatalyst is, the more effective the photocatalytic reaction takes place. It is preferable that the photocatalyst has an average particle size of 50 nm or less, and it is particularly preferable to use a photocatalyst of 20 nm or less. In addition, the smaller the particle size of the photocatalyst is, the smaller the surface roughness of the formed photocatalyst-containing layer is. It is preferable that the particle size of the photocatalyst exceeds 100 nm. It is not preferable because the ink repellency of the non-exposed portion of the containing layer is reduced, and the expression of ink affinity in the exposed portion is insufficient.

The binder used in the photocatalyst-containing layer of this type preferably has a high binding energy such that the main skeleton is not decomposed by the photoexcitation of the photocatalyst. For example, (1) chloro or alkoxysilane by a sol-gel reaction or the like is used. And (2) organopolysiloxanes obtained by crosslinking reactive silicones having excellent water repellency and oil repellency, and the like.

In the case of the above (1), the general formula: Y _n SiX _(4-n) (where Y represents hydrogen or a hydrocarbon group which may have a substituent. May be the same or different groups, and n is an integer from 0 to 3.) or one or more hydrolytic condensates of the silicon compound represented by It is preferably an organopolysiloxane which is a co-hydrolysis condensate.

The silicon compound represented by the above general formula preferably has at least one hydrocarbon group which may have a substituent as Y.

In the above general formula, the unsubstituted hydrocarbon group or the hydrocarbon group portion of the substituted hydrocarbon group may be, for example, a linear or branched aliphatic hydrocarbon group such as methyl, ethyl and other alkyl. An alicyclic hydrocarbon group such as cyclohexyl; an unsaturated hydrocarbon group such as vinyl; an aromatic hydrocarbon group such as phenyl; and the hydrocarbon group or the hydrocarbon group portion has 1 to 20 carbon atoms. Is preferably within the range.

In the above formula, the hydrocarbon group which may have a substituent includes a fluorine-containing hydrocarbon group such as fluoroalkyl; glycidoxyalkyl and β-
Epoxy-containing hydrocarbon groups such as (3,4-epoxycyclohexyl) alkyl; acryloyloxy or methacryloyloxy-containing hydrocarbon groups such as (meth) acryloyloxyalkyl; amino-containing hydrocarbon groups such as aminoalkyl; mercaptoalkyl And a fluoroalkyl-containing hydrocarbon group such as an N-fluoroalkylsulfonamidoalkyl-containing hydrocarbon group such as N-fluoroalkylsulfonylaminoalkyl.

The alkoxy group represented by X is preferably a methoxy group, an ethoxy group, a propoxy group, or a butoxy group.

Specifically, methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane; ethyltrichlorosilane, ethyltribromosilane, ethyltrichlorosilane Methoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane; n
-Propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-propyltri-t-butoxysilane; n-
Hexyltrichlorosilane, n-hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltri-t-butoxysilane; n-decyltrichlorosilane, n-decyltribromosilane,
n-decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n-
Decyltri-t-butoxysilane; n-octadecyltrichlorosilane, n-octadecyltribromosilane, n
-Octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane; phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyl Triisopropoxysilane, phenyltri-t-butoxysilane; tetrachlorosilane, tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, dimethoxydiethoxysilane; dimethyldichlorosilane, dimethyldibromosilane, dimethyldimethoxysilane , Dimethyldiethoxysilane; diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane Phenyl methyldichlorosilane,
Phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane; trichlorohydrosilane, tribromohydrosilane, trimethoxyhydrosilane, triethoxyhydrosilane, triisopropoxyhydrosilane, tri-t-butoxyhydrosilane; vinyltrichlorosilane, vinyltribromo Silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltriisopropoxysilane, vinyltrit
-Butoxysilane; trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltri-t-butoxysilane; γ- Glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
Glycidoxypropyltriisopropoxysilane, γ
-Glycidoxypropyltri-t-butoxysilane; γ-
Methacryloyloxypropylmethyldimethoxysilane, γ-methacryloyloxypropylmethyldiethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropyltriethoxysilane, γ-methacryloyloxypropyltriisopropoxysilane, γ-methacryloyloxypropyltri-t-butoxysilane; γ-aminopropylmethyldimethoxysilane, γ-aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ
-Aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane; γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane Γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane; β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane; And their partial hydrolysates; and their mixtures.

Further, as the organopolysiloxane compound, a compound having a fluoroalkyl group is particularly preferable.
When the wettability variable layer is formed using an organopolysiloxane compound having a fluoroalkyl group, the water repellency and ink repellency of the non-exposed portion are increased by the action of the fluoroalkyl group, and the exposed portion that has been made highly hydrophilic and the high water repellency are improved. The difference in wettability with ink between the non-exposed portions can be increased.

Specifically, a hydrolyzed condensate having a silicon compound represented by the above general formula Y _n SiX _(4-n) as a condensation unit,
Or a co-hydrolysis condensate, wherein all or at least a part of the condensed units are one or two of a fluoroalkyl group-containing silicon compound such as a fluoroalkylsilane described below.
More than one species can be used. The following fluoroalkylsilanes are generally known as fluorine-based silane coupling agents.

CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ Si (OC
_{H 3) 3; (CF 3} ) 2 CF (CF 2) 4 CH 2 CH 2 Si (O
CH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂ Si
(OCH ₃ ) ₃ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈ CH ₂ CH ₂ S
i (OCH ₃ ) ₃ ; CF ₃ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 3 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₅ (C ₆ H ₄ ) C ₂ H ₄ Si (OC
_{H 3) 3; CF 3 (} CF 2) 7 (C 6 H 4) C 2 H 4 Si (OC
H ₃ ) ₃ ; CF ₃ (CF ₂ ) ₃ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₅ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; CF ₃ (CF ₂ ) ₇ CH ₂ CH ₂ SiCH ₃ (OCH
₃ ) ₂ ; CF ₃ (CF ₂ ) ₉ CH ₂ CH ₂ SiCH ₃ (OC
H ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₄ CH ₂ CH ₂ SiCH
₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₆ CH ₂ CH ₂
Si CH ₃ (OCH ₃ ) ₂ ; (CF ₃ ) ₂ CF (CF ₂ ) ₈
CH ₂ CH ₂ Si CH ₃ (OCH ₃ ) ₂ ; CF ₃ (C ₆ H ₄ )
C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₃ (C ₆
H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF ₂ ) ₅
(C ₆ H ₄ ) C ₂ H ₄ SiCH ₃ (OCH ₃ ) ₂ ; CF ₃ (CF
_{2) 7 (C 6 H 4} ) C 2 H 4 SiCH 3 (OCH 3) 2; CF
₃ (CF ₂ ) ₃ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃
(CF ₂ ) ₅ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF
₃ (CF ₂ ) ₇ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; CF ₃
(CF ₂ ) ₉ CH ₂ CH ₂ Si (OCH ₂ CH ₃ ) ₃ ; and CF ₃ (CF ₂ ) ₇ SO ₂ N (C ₂ H ₅ ) C ₂ H ₄ CH ₂ Si
(OCH _{3) 3.}

By using a fluorosiloxane-containing polysiloxane as described above as a binder,
Since the ink repellency before changing the wettability of the photocatalyst-containing layer is increased, the difference in wettability before and after changing the wettability can be increased.

The reactive silicone of the above (2) includes compounds having a skeleton represented by the following general formula.

[0147]

Embedded image Here, n is an integer of 2 or more, and R ¹ and R ² are each a substituted or unsubstituted alkyl, alkenyl, aryl or cyanoalkyl group having 1 to 10 carbon atoms, and 40% or less of the whole by mole ratio. Vinyl, phenyl and halogenated phenyl. Further, those in which R ¹ and R ² are methyl groups are preferred because the surface energy is minimized, and the molar ratio of the methyl groups is preferably 60% or more. Also,
The chain terminal or the side chain has at least one or more reactive groups such as hydroxyl groups in the molecular chain.

In addition, a stable organosilicon compound that does not undergo a cross-linking reaction, such as dimethylpolysiloxane, may be mixed with the above-mentioned organopolysiloxane in a binder.

The photocatalyst containing layer may contain a surfactant in addition to the above photocatalyst and binder. Specifically, NIKKOL BL, B manufactured by Nikko Chemicals Co., Ltd.
C, BO, BB series hydrocarbons, DuPont ZONYL FSN, FSO, Asahi Glass Co., Ltd. Surflon S-141, 145, Dainippon Ink & Chemicals, Inc. Megafax F-141, 144 Fluoro- or silicone-based nonionic surfactants such as Neogent Co., Ltd.'s Futhergent F-200, F251, Daikin Industries, Ltd. Unidyne DS-401, 402, and 3M Co., Ltd.'s Florard FC-170, 176. Examples of the agent include a cationic surfactant, an anionic surfactant, and an amphoteric surfactant.

The photocatalyst-containing layer may contain polyvinyl alcohol, unsaturated polyester, acrylic resin, polyethylene, diallyl phthalate, ethylene propylene diene monomer, epoxy resin, phenol resin, polyurethane, melamine resin in addition to the above-mentioned surfactant. , Polycarbonate, polyvinyl chloride, polyamide, polyimide, styrene butadiene rubber, chloroprene rubber, polypropylene, polybutylene, polystyrene, polyvinyl acetate, polyester, polybutadiene, polybenzimidazole, polyacrylonitrile, oligomers such as epichlorohydrin, polysulfide, polyisoprene, A polymer or the like can be contained.

The content of the photocatalyst in the photocatalyst containing layer is 5 to 5.
It can be set in the range of 60% by weight, preferably 20 to 40% by weight. Further, the thickness of the photocatalyst-containing layer is 0.1 mm.
It is preferably in the range of 05 to 10 μm.

As a solvent for dissolving and dispersing the above components, an alcoholic organic solvent such as ethanol and isopropanol is preferable. The coating can be performed by a known coating method such as spin coating, spray coating, dip coating, roll coating, and bead coating. When a UV-curable component is contained as a binder, the photocatalyst-containing layer can be formed by performing a curing treatment by irradiating ultraviolet rays.

B) A photocatalyst-containing layer is provided below the variable wettability layer to increase the hydrophilicity of the variable wettability layer. To form a wettability variable layer of this type, first, a binder and a photocatalyst are dissolved. After applying the dispersed coating liquid on the transparent substrate of the color filter, hydrolysis and polycondensation are allowed to proceed to form a photocatalyst-containing layer, or a photocatalyst-containing layer of a single photocatalyst. Next, a thin film variable wettability layer made of a hydrophobic organic material is formed on the photocatalyst-containing layer. Photocatalyst, binder, or solvent, etc.
The same type as used in the type a) may be used.

For the formation of the organic thin film, a solution coating, a surface grafting treatment, a surfactant treatment, a film forming method using a gas phase such as PVD or CVD can be used. As the organic substance, a low-molecular compound, a high-molecular compound, a surfactant, or the like, whose wettability is changed by a photocatalyst can be used. Specifically, a silane compound in which an organic group is changed to a hydroxyl group by the action of a photocatalyst, and a silane coupling agent, chlorosilane, alkoxysilane, or a hydrolyzed condensate or a cohydrolyzed condensate of two or more of these. Can be. On the photocatalyst containing layer, a variable wettability layer composed of the above-mentioned organopolysiloxane may be formed. In this case, it is preferable to use an organopolysiloxane containing a fluoroalkyl group.

The wettability variable layer exemplified above is the photocatalyst-containing layer itself containing a photocatalyst, or the photocatalyst-containing layer provided on the transparent substrate side of the wettability variable layer. The photocatalyst is activated by irradiating the photocatalyst-containing layer with a light beam, and the action of the activated photocatalyst changes the wettability in a direction in which the ink affinity increases. That is, each of the exemplified wettability variable layers changes the wettability in a direction in which the ink affinity increases when irradiated with light.

However, in the present invention, the variable wettability layer is not particularly limited as long as it is a layer whose surface wettability can be changed by an external stimulus such as a physical stimulus or a chemical stimulus. is not. For example, a layer whose surface roughness changes due to an acid or alkali or the like and whose wettability changes may be used, or a layer whose wettability is changed by irradiation of energy such as ultraviolet light or visible light or heat. It may be a layer or the like in which the wettability changes due to the change of the substance inside.

The photocatalyst-containing layer used in the exemplified method irradiates the pixel portion forming region with light rays to increase the ink-affinity and selectively adheres the ink composition. By providing a wettability variable layer such that the ink property is reduced on the transparent substrate of the color filter and applying a stimulus to change the wettability in a negative pattern of the pixel portion forming area, the ink composition can be applied only to the desired area. Can be selectively attached to

Next, an ink for forming a pixel portion of each color, which is an ink-jet ink composition for a color filter according to the present invention and which contains one or more pigments, is prepared. Then, in the pixel portion forming regions 4R, 4G, and 4B having increased ink affinity in the step of FIG.
The ink for forming the pixel portion of the corresponding color is selectively adhered, and the ink layers 6R, 6G, and 6B as shown in FIG.
To form

Next, as shown in FIG. 2E, the ink layers 6R, 6G and 6B of the respective colors are cured by irradiating or heating with energy rays such as ionizing radiation rays 7 according to the binder system. Then, if necessary, baking is performed to form the pixel portions 8R, 8G, and 8B of the respective colors. Next, as shown in FIG. 2F, the pixel portions 8R, 8G,
The protective layer 9 is formed on the side where 8B is formed. FIG. 2 (E)
The photo-curing step and the protective layer forming step in the second method as shown in FIG. 2F can be performed in the same manner as in the first method.

In the second method, the color filter 101B is manufactured in this manner. In this example, the pixel portion is formed using the pixel portion forming ink which is the inkjet ink for a color filter according to the present invention, and the ink composition according to the present invention is formed by utilizing the difference in wettability of the substrate surface. By selectively adhering only to the ink-philic region, a colored cured layer other than the pixel portion such as the light shielding portion 2 can be formed in a desired pattern.

[0161]

EXAMPLES (Example 1) (1) Preparation of Coating Liquid for Photocatalyst-Containing Layer The following components were mixed and stirred at 100 ° C. for 20 minutes to prepare a coating liquid for a photocatalyst-containing layer. <Composition of coating solution for photocatalyst containing layer>-Isopropyl alcohol: 3 g-Fluoroalkylsilane (Made by Tochem Products, M
F-160E: N- [3- (trimethoxysilyl) propyl] -N-ethyl-perfluorooctanesulfonamide in 50% by weight isopropyl ether solution): 0.0
7 g ・ Titanium oxide sol (STK-01, manufactured by Ishihara Sangyo): 3 g ・ Silica sol (Glaska HPC700, manufactured by Nippon Synthetic Rubber)
2): 0.6 g alkylalkoxysilane (Nippon Synthetic Rubber, HPC
402C): 0.2 g (2) Formation of photocatalyst-containing layer The above-mentioned photocatalyst-containing layer coating was performed on a transparent substrate made of soda glass having a black matrix composed of a chromium thin film pattern having openings of 76 μm × 259 μm and a line width of 23 μm. The working fluid was applied by a spin coater, and after a drying treatment at 150 ° C. for 10 minutes, hydrolysis and polycondensation were allowed to proceed.
A 0.5 μm thick transparent photocatalyst-containing layer in which the photocatalyst was firmly fixed in the organopolysiloxane was formed.

The photocatalyst-containing layer was irradiated with a mercury lamp (wavelength 365 nm) through a mask at an illuminance of 70 mW / cm ^2.
Light was irradiated for a minute, and the contact angles of the non-irradiated portion and the irradiated portion to water were measured. The contact angle was measured 30 seconds after a water drop was dropped from a micro syringe on a non-irradiated part or an irradiated part using a contact angle measuring device (CA-Z type, manufactured by Kyowa Interface Science Co., Ltd.). As a result, the contact angle of water at the non-irradiated part was 70 °, whereas the contact angle of water at the irradiated part was 10 ° or less, and the irradiated part became highly hydrophilic, and the irradiated part became non-irradiated. It was confirmed that pattern formation was possible using the difference in wettability with the site.

Further, the contact angle (θ) was measured 30 seconds after the droplet was brought into contact with the non-irradiated portion of the photocatalyst-containing layer using the standard solution shown in the wettability test specified in JIS K6768, A Mann plot (horizontal axis: surface tension of the standard solution, vertical axis: cos θ) was prepared and extrapolated from the graph. The surface tension indicated by the point where cos θ = 0, that is, the critical surface tension of the non-irradiated portion was 30 mN / m. When the critical surface tension at the irradiation site was measured by the same method, it was 70 mN / m.

(3) Exposure of Photocatalyst-Containing Layer A mask having a light-shielding pattern having a pattern pitch of 76 μm × 259 μm and a width (10 μm) smaller than the line width of the black matrix (23 μm) is used as a photocatalyst on the transparent substrate. After arranging the photocatalyst containing layer on the photocatalyst containing layer and arranging the photocatalyst containing layer so as to overlap with the black matrix with a mercury lamp (wavelength 365 nm) at an illuminance of 70 mW / cm ² for 50 seconds through the mask, the irradiated portion was exposed. Highly hydrophilic. Each irradiated part is defined by a non-irradiated part having a width of 10 μm existing on the black matrix, and has a pixel part forming area of 76 μm × 259 μm surrounded by the black matrix and an area overlapping with the surrounding black matrix. Was.

(4) Preparation of Colored Ink for Pixels Among the following components, first, a pigment and a polymer dispersant are charged into a part of a solvent, mixed, and stirred using a three-roll mill and a bead mill to prepare a pigment. A dispersion was obtained. On the other hand, other components were added to the remainder of the solvent, stirred and dissolved and dispersed to obtain a binder solution. Then, the ink was prepared by sufficiently stirring with a dissolver while adding the pigment dispersion liquid little by little into the binder solution. <Composition of Colored Ink for Blue Pixel Part> Pigment (CI Pigment Blue 15: 6): 5 parts by weight Polymer Dispersant (Avecia, Solsperse 24)
000): 2 parts by weight Binder (benzyl methacrylate-methacrylic acid copolymer): 3 parts by weight Monomer 1 (dipentaerythritol pentaacrylate): 2 parts by weight Monomer 2 (tripropylene glycol diacrylate): 5 parts by weight -Initiator (2-methyl-1- [4- (methylthio) phenyl] -2-monforinopropane) -1-one: 2 parts by weight-Solvent (diethylene glycol monobutyl ether acetate, 29.9 dyn / cm): 81 Parts by weight Among the above components, diethylene glycol monobutyl ether acetate, which is a solvent, was measured for a contact angle (θ) 30 seconds after contacting a droplet with a standard solution indicated in a wettability test specified in JIS K6768. And the critical surface tension determined from the graph of the Zisman plot is 30 m
The contact angle with respect to the surface of the N / m test piece was 32.8 °, and the critical surface tension determined by the same measurement method was 70.
The contact angle with respect to the surface of the mN / m test piece was 0 °.

In the same test, tripropylene glycol diacrylate, which is a bifunctional monomer,
The contact angle with respect to the surface of the test piece having a critical surface tension of 30 mN / m determined by the graph of the Zisman plot is 25 °, and the critical surface tension determined by the same measurement method is 7 °.
The contact angle with respect to the surface of the test piece of 0 mN / m showed 0 °.

Furthermore, C.I. I. Pigment Blue 15: 6 instead of C.I. I. Pigment Red 25
A colored ink for a red pixel portion was prepared in the same manner as in the case of the colored ink for a blue pixel portion, except that the same amount of 4 was used. Further, C.I. I. Pigment Blue 15: 6 instead of C.I. I. Pigment Green 36 was prepared in the same manner as in the case of the blue pixel portion coloring ink except that the same amount of Pigment Green 36 was used.

(4) Manufacture of Color Filter The ink-jet head was filled with the pixel portion coloring ink of each color. Next, a colored ink for a blue pixel portion was dropped from the head with a drop diameter of 30 μm to the center of each of the pixel portion forming regions for blue scattered on the substrate.

Similarly, a red pixel portion forming region is formed on the substrate by pattern exposure, and the red pixel portion coloring ink is applied from the head to the center of each red pixel portion forming region scattered on the substrate. The solution was dropped at a drop diameter of 30 μm. Further, a green pixel portion forming region was formed on the substrate, and a green pixel portion coloring ink was dropped from the head onto the center of each green pixel portion forming region with a drop diameter of 30 μm.

The dropped colored ink for the pixel portion of each color was repelled in the non-irradiated portion on the black matrix, and was uniformly diffused and selectively adhered in the pixel portion forming region of each color.

Thereafter, the colored ink layers of each color were heated at 80.degree.
And dried for 70 minutes with a mercury lamp (wavelength 365 nm).
A light beam was irradiated for 30 seconds at an illuminance of mW / cm ² , and a heat treatment was further performed at 230 ° C. for 30 minutes to form a pixel portion.

Next, a two-part mixed type thermosetting agent (SS7265 manufactured by Nippon Synthetic Rubber Co., Ltd.) was applied on the pixel portion by a spin coater, and cured at 200 ° C. for 30 minutes to form a protective layer. Thus, a color filter was obtained.

Example 2 (1) Preparation of Colored Ink for Pixels Colored ink for blue pixels having the following composition (blue ink 2-1)
And 2-2) were prepared. For both colored inks, first, a pigment and a polymer dispersant are added to a part of the solvent,
The mixture was mixed and stirred using a three-roll mill and a bead mill to obtain a pigment dispersion. On the other hand, other components were added to the remainder of the solvent, stirred and dissolved and dispersed to obtain a binder solution. Then, while the pigment dispersion was added little by little to the binder solution, the mixture was sufficiently stirred with a dissolver to prepare a blue pixel portion colored ink. <Composition of Colored Ink 2-1 for Blue Pixel Part> Blue Ink 2
As -1, the same colored ink for a blue pixel portion as prepared in Example 1 was used as it was. <Composition of the coloring ink 2-2 for the blue pixel portion> Pigment (CI Pigment Blue 15: 6): 5 parts by weight Polymer dispersant (Solsperse 240 manufactured by AVECIA)
00): 2 parts by weight Binder (benzyl methacrylate-methacrylic acid copolymer): 3 parts by weight Monomer 1 (dipentaerythritol pentaacrylate): 2 parts by weight Monomer 2 (tripropylene glycol diacrylate): 5 parts by weight -Initiator (2-methyl-1- [4- (methylthio) phenyl] -2-monforinopropane) -1-one: 2 parts by weight-Solvent (propylene glycol monomethyl ether acetate, 27.7 dyn / cm): 81 parts by weight (2) Measurement of viscosity The viscosity of each blue ink was measured using a viscometer VIBROVISC.
Using OMETER CJV5000 (manufactured by A & D),
It was measured at a temperature of 20 ° C.

(3) Intermittent Ejection Stability Test Each ink jet head was filled with each blue ink, ejected from the heads, provided with a photocatalyst-containing layer in the same manner as in Example 1, and exposed to a predetermined pattern. A drop diameter of 3 is formed at the center of the blue pixel portion forming region of the glass transparent substrate.
It was dropped at 0 μm. Further, after the initial ejection was stopped and the head was allowed to stand still for 30 minutes, a drop of 30 μm was dropped from the same head to the center of another blue pixel portion formation region. In such an intermittent ejection, the ejection property at the time of performing the first ejection operation (initial ejection property) and the ejection property at the time of performing re-ejection (intermittent ejection stability) are observed and evaluated according to the following criteria. did.

<Evaluation Criteria for Initial Discharge Property> A: Ink can be discharged from all holes (orifices) of the head. Δ: There are some holes in the head where no ink comes out. X: Ink does not come out from most holes of the head.

<Evaluation Criteria of Intermittent Ejection Stability> A: Ink can be ejected again from all holes of the head. Δ: There are some holes in the head where no ink comes out. X: Ink does not come out from most holes of the head.

As shown in Table 1, when the blue ink 2-2 was used, about 3 to 4 holes (clogging) were detected after 30 minutes. On the other hand, when the blue ink 2-1 was used, it was confirmed that even after 30 minutes had elapsed, no holes were missing and the ink was ejected from all the holes.

[0178]

[Table 1] (4) Test of continuous discharge stability Each ink jet head was filled with each blue ink, continuously discharged from the head, and a droplet was landed on a Teflon (registered trademark) roll rotated at a constant speed. The landing position of the droplet and the presence or absence of the landing were observed for a long time with a digital video recorder (Sony, DCR-TRV20). As a result, when the blue ink 2-2 is used, 10
It was confirmed that the landing positions fluctuated after the lapse of minutes. On the other hand, when the blue ink 2-1 is used, 30
Even after a lapse of minutes, it was confirmed that the landing positions did not fluctuate and the ink was ejected accurately from all the holes.

(5) Observation of Discharge While the strobe was emitting light, the discharge state of the ink and the spread of the ink on the orifice surface were observed with a CCD camera (CS3910, manufactured by Tokyo Denshi Kogyo). As a result, when the blue ink 2-2 was used, it was confirmed that the ink on the surface of the orifice wetted and spread much as shown in the photograph in FIG. On the other hand, when the blue ink 2-1 was used, it was confirmed that the ink spread on the orifice surface was suppressed as shown in the photograph in FIG. . In addition, in the photograph of FIG.3 and FIG.4,
The lower side of the vertically symmetric image is the real image, and the upper side is the shadow of the real image.

[0180]

As described above, the ink-jet ink composition for a color filter according to the present invention does not dry rapidly even when performing intermittent ejection or continuous ejection. It is unlikely to cause an excessive increase in viscosity or clogging, it is difficult for the orifice surface to wet and spread, and is excellent in the stability of the ejection direction and the ejection amount. Therefore, by discharging the ink composition according to the present invention onto the substrate surface according to a predetermined pattern by an inkjet method, a colored cured layer such as a pixel portion or a light-shielding portion can be formed accurately and uniformly.

Further, the ink-jet ink composition for a color filter according to the present invention does not dry rapidly at the nozzle tip of the ink-jet head, but has an appropriate drying property. Therefore, after being discharged onto the substrate, it can be completely dried in a relatively short time by natural drying or a general heating method after it has been applied to the substrate surface and sufficiently leveled. Therefore, a highly uniform pattern can be obtained and drying can be performed efficiently.

Further, by selectively changing the wettability in a predetermined area on the substrate surface, an ink layer forming area having a higher ink affinity than the surrounding area is formed, and the ink composition according to the present invention is inkjet-printed there. When sprayed by the method, a certain amount of ink droplets are ejected at the correct position, and the landed ink droplets spread to every corner of the ink layer formation area without staying at the landing position, and the surrounding ink repellency The ink drops swell without protruding from the boundary with the area. Therefore, a thick colored hardened layer can be accurately formed, and, for example, a pixel portion with no color loss and high transmission density can be obtained.

In particular, a wettability variable layer that changes the wettability in a direction in which the ink affinity increases by the action of the photocatalyst is provided on the substrate, and the wettability variable layer is exposed in a predetermined pattern to form the ink affinity. When the ink layer forming region is formed, 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 from the contact of the droplet is measured. And the critical surface tension determined by the graph of the Zisman plot is 30 mN.
/ M shows a contact angle of 25 ° or more with the surface of the test piece, and the critical surface tension obtained by the same measurement method is 70 °.
It is preferable to use an ink composition prepared using an ink composition having a contact angle of 10 ° or less with respect to the surface of a test piece of mN / m, and accurate and uniform pattern efficiency can be obtained.

According to the ink composition and the method for producing a color filter according to the present invention, a color filter having good performance can be produced. In particular, a pixel portion having a large and uniform transmission density and having no color loss can be precisely formed. Can be formed.

[Brief description of the drawings]

FIG. 1 is an illustration of a method for producing a color filter using the ink composition of the present invention.

FIG. 2 is a diagram illustrating another method for producing a color filter using the ink composition of the present invention.

FIG. 3 is a photograph showing a state where the ink composition of the present invention is discharged by an inkjet method.

FIG. 4 is a photograph showing a state in which an ink composition of a comparative example is ejected by an inkjet method.

FIG. 5 is a diagram illustrating wetting and spreading of ink on the orifice surface and flight deflection of ink droplets.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent substrate 2 ... Shield part 3 ... Ink-repellent convex part 4 ... Pixel part formation area 5 ... Ink jet head 6 ... Ink layer 7 ... Ionizing radiation 8 ... Pixel part 9 ... Protective film 10 ... Photocatalyst containing layer 11 ... Photomask 12 Exposure unit 13 Light beam 14 Orifice 15 Ink droplet

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H048 BA47 BA64 BB42 2H086 BA01 BA02 BA04 BA54 BA60 BA61 BA62 4J039 AD09 AD10 AD20 AD21 AE03 AE04 AE05 AE06 AE07 BA04 BA13 BA18 BA23 BA30 BA31 BA34 BA35 BA36 BA37 BA38 BC13 BE20 BE12 BE22 CA07 EA06 EA08 EA15 EA16 EA17 EA19 EA20 EA21 EA44 GA24

Claims (12)

[Claims] 1. A solvent comprising at least a binder component, a pigment and a solvent, having a boiling point of 180 ° C. to 26 ° C. as a main solvent.
An ink-jet ink composition for a color filter, comprising a solvent component having a vapor pressure of 0.5 mmHg or less at 0 ° C. and room temperature in a proportion of 90% by weight or more based on the total amount of the solvent. 2. The method according to claim 2, wherein said main solvent is JIS K676.
Using the standard solution shown in the wettability test specified in No. 8, the contact angle (θ) was measured 30 seconds after the droplets were brought into contact with each other, and the critical surface tension obtained from the graph of the Zisman plot was 30 mN / m. The contact angle with respect to the surface of the test piece was 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 1
The inkjet ink composition for a color filter according to claim 1, wherein a solvent exhibiting 0 ° or less is used. 3. The main solvent is ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, diethyl malonate, succinic acid. The inkjet ink composition for a color filter according to claim 2, wherein the inkjet ink composition is dimethyl or diethyl succinate. 4. The color according to claim 1, wherein the binder component contains an ethylenic double bond-containing compound having a weight average molecular weight of 25,000 or less and further contains a difunctional or trifunctional monomer. An inkjet ink composition for a filter. 5. The method according to claim 4, wherein the viscosity of the bifunctional or trifunctional monomer is 100 cps or less.
3. The ink-jet ink composition for a color filter according to item 1. 6. The bifunctional to trifunctional monomer 100
1 part by weight of a polyfunctional monomer having 4 or more functional groups per part by weight
The inkjet ink composition for a color filter according to claim 4, wherein the ink composition is contained in an amount of 50 to 50 parts by weight. 7. A pigment and, if necessary, a pigment dispersant mixed with a dispersion preparation solvent containing, as a main 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. A pigment dispersion is prepared by mixing the obtained pigment dispersion, a binder component and other components as necessary with the newly prepared main solvent, and the mixing ratio of the main solvent in the total amount of the solvent. Is adjusted to 90% by weight or more, a method for producing an inkjet ink composition for a color filter. 8. The main solvent includes ethylene glycol monobutyl ether acetate, diethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol dibutyl ether, diethyl adipate, dibutyl oxalate, dimethyl malonate, diethyl malonate, succinic acid. The method for producing an ink-jet ink composition for a color filter according to claim 7, wherein dimethyl or diethyl succinate is used. 9. The method according to claim 1, wherein a predetermined area on the substrate is provided.
A step of forming an ink layer by selectively attaching the ink-jet ink composition for a color filter according to any of the above, by an ink-jet method, and a step of forming the colored cured layer by curing the ink layer. Characteristic method for producing a color filter. 10. A step of selectively changing wettability in a predetermined area on the surface of the substrate to form an ink layer forming area having greater ink affinity than surrounding areas, and Item 7. A step of forming an ink layer by selectively attaching the ink-jet ink composition for a color filter according to any one of Items 1 to 6 by an ink-jet method, and a step of forming a colored cured layer by curing the ink layer. A method for manufacturing a color filter, comprising: 11. A step of forming, on a substrate, a variable wettability layer capable of changing the wettability in a direction in which the ink affinity increases by the action of a photocatalyst; A step of selectively changing the wettability of the ink by exposure to form an ink layer forming region having greater ink affinity than the surroundings; and the color filter inkjet ink according to claim 2 in the ink layer forming region. A method for producing a color filter, comprising: a step of selectively adhering a composition to form an ink layer; and a step of curing the ink layer to form a colored cured layer. 12. The method for producing a color filter according to claim 9, wherein a pixel portion is formed as the colored cured layer.