JP2799635B2 - Manufacturing method of color filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a color filter, and more particularly to a method for producing a color filter suitable for a color liquid crystal display device.

[0002]

2. Description of the Related Art At present, methods for producing a color filter generally used include a dyeing method in which a transparent substrate is colored with a binder containing a dye or a pigment, a printing method, a pigment dispersion method, and the like.

However, since the above-mentioned dyeing method is a method of selectively dyeing a resin thin film on a substrate with a dye, it is necessary to carry out a dye-proofing and photolithography step every time the color is changed. However, there is a problem in that the fineness of the color pattern is limited, and the accuracy of the printing position becomes worse as the number of colors increases. In addition, although the pigment dispersion method allows a fine pattern, it requires a high-precision photolithography step for each color change, and has the disadvantage that the step is extremely complicated.

On the other hand, in order to solve these drawbacks, Japanese Patent Application Laid-Open No. 59-114572 proposes a method for producing a color filter by an electrodeposition coating method. In the method, first, a transparent electrode is formed by patterning a transparent conductive film formed on a substrate, and a voltage is applied only to a portion of the patterned transparent electrode which is colored in the same color, and in a colored electrodeposition bath. A colored layer is formed by electrodeposition. Next, a voltage is applied only to a portion to be colored in another color to perform an electrodeposition process to form another colored layer. However, in this method, first, the patterning of the transparent electrode that requires high precision must be performed first.
Great care must be taken in handling in the post-process, and disconnection of even a part of the fine pattern makes the subsequent coloring process difficult, which is not preferable in manufacturing. Further patterned transparent electrodes
All of the fine portions must be electrically continuous, and the degree of freedom of the pattern shape is limited.

In Japanese Patent Application Laid-Open No. Sho 63-210901, exposure is performed using a positive photosensitive resin composition through a mask having a pattern of only portions colored in the same color.
Develop and form a colored layer by electrodeposition.
A method has been proposed in which the development and electrodeposition steps are repeated a desired number of times, but this method is inferior in stability because a compound having an unstable quinonediazide group is used. When the quinonediazide compound is further exposed to an aqueous alkali solution for development,
The unexposed quinonediazide compound also reacts with the aqueous alkali solution to significantly change the photosensitivity, making subsequent exposure and development difficult.

In these electrodeposition methods, a transparent electrode for forming a colored layer is also used as an electrode for driving a liquid crystal, but the colored layer formed on the transparent electrode is an insulator. Therefore, the driving voltage of the liquid crystal becomes very high. Therefore, at present, a transparent electrode for driving a liquid crystal is further provided on the colored layer formed based on the above method to lower the driving voltage. The transparent electrode used in the method has a light transmittance of 80 to 85%,
Providing two layers of transparent electrodes lowers the light transmittance and causes a problem that the performance as a colored display substrate is inferior. In order to solve such a problem, Japanese Patent Laid-Open Publication No.
In Japanese Patent Application Laid-Open Publication No. H10-157, a method is proposed in which a colored layer is formed on an original plate and transferred onto a transparent substrate. In this method, since transfer is performed for each color, high-precision alignment is required for each transfer. Becomes

[0007] All of the above-mentioned methods require high-precision processing technology for alignment, and are required to respond to demands for larger work sizes, that is, demands for larger screen dimensions and cost reductions due to multiple screens. Have difficulty.

[0008]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, to eliminate the need for advanced fine processing technology, to provide a large degree of freedom in the pattern shape of the colored layer, and to increase the size. An object of the present invention is to provide a method for producing a color filter which is easy to cope with and easy and easy to mass-produce.

[0009]

Means for Solving the Problems The present inventors have studied a method of manufacturing a color filter which has a large degree of freedom in the pattern shape of a colored layer and can cope with an increase in size, and as a result, it has been identified as a negative photosensitive resin. It has been found that a color filter having excellent performance can be obtained by a simple process of combining these masks.

That is, according to the present invention, (A) a step of forming a photosensitive coating film on a substrate having a conductive layer on the surface and exposing through a negative mask having at least three different light transmittance patterns And (B) performing an operation of developing and removing the photosensitive coating film of the pattern portion and electrodepositing a colored paint on the exposed conductive layer to form a colored layer, the pattern portion corresponding to the light transmittance of the negative mask in ascending order. And (C) transferring the colored layer onto a substrate for transferring the colored layer. Is done.

Hereinafter, the present invention will be described in more detail.

In the present invention, first, a photosensitive coating is formed on a substrate having a conductive layer on the surface, and is exposed through a negative mask having a pattern having at least three different light transmittances (hereinafter referred to as a step (A)). ).

The substrate having a conductive layer on the surface used in the present invention is not particularly limited as long as it is on a plate having a conductive layer on the surface. For example, the conductive layer may be formed on the surface of a metal plate or a plate-like insulator. And the like formed thereon. The surface of the substrate is desirably smooth in view of the performance of the color filter. If necessary, the surface can be polished and used. In order to facilitate the transfer in the subsequent step, a release layer such as a silicone thin film may be formed on the surface of the substrate in advance.

The material of the conductive layer is not particularly limited, and a known conductive material can be used. The method for forming the conductive layer is not particularly limited, for example, a spray method,
Known methods such as CVD, sputtering, and vacuum deposition
Law.

The method for forming the photosensitive coating film formed on the substrate is not particularly limited, but the photosensitive coating material is usually formed by a known method such as an electrodeposition method, a spraying method, a dip coating method, a roll coating method, and a screen. It can be formed by coating on a substrate by a printing method, a method of coating with a spin coater, or the like.

As the photosensitive coating material for forming the photosensitive coating film, a resin having film forming ability and photosensitivity (hereinafter, referred to as a resin).
A resin for a photosensitive coating), a coating obtained by dispersing or dissolving a photopolymerization initiator and, if necessary, a dye and / or a pigment in an organic solvent or water. The photosensitive paint may or may not contain a dye and / or a pigment, but may contain a hue dye and / or a pigment which is one component of a target color filter. This is preferable because the number of repetitions of the step (B) described later can be omitted once.

The resin for a photosensitive coating preferably used in the present invention includes a photosensitive group such as a (meth) acryloyl group such as an acryloyl group and a methacryloyl group and / or a cinnamoyl group at a molecular terminal and / or a side chain. And generally a prepolymer or resin having a molecular weight of about 500 to 10,000.

Examples of the prepolymer or resin include prepolymers such as epoxy (meth) acrylate, urethane (meth) acrylate, and polyester (meth) acrylate; and amino groups such as acrylic resins, epoxy resins, urethane resins, and polybutadiene resins. , Ammonium, sulfonium and other onium groups and the above-mentioned photosensitive groups, and resins such as resins which are solubilized and / or dispersed in water with acids or acidic substances such as formic acid, acetic acid, propionic acid and lactic acid. Acrylic resin, polyester resin, maleated oil resin, polybutadiene resin,
A resin in which a carboxyl group or the like and the photosensitive group are introduced into an epoxy resin or the like, such as triethylamine, diethylamine,
Examples include anionic resins such as resins solubilized and / or dispersed in water with a basic substance such as dimethylethanolamine and ammonia. Particularly, from the viewpoint of simplifying the process and preventing pollution, the resin is solubilized in water. The use of and / or dispersible prepolymers or resins is preferred.

In addition, low-molecular-weight (meth) acrylates may be added to the photosensitive coating resin in order to adjust the photosensitivity and viscosity of the coating film. (Meth) acrylate, 2-phenoxyethyl (meth) acrylate, 3-phenoxy-2-hydroxypropyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, tricyclodecane (meth)
Acrylate, hexanediol di (meth) acrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, tris (acryloyloxyethyl) isocyanurate and the like are exemplified, and these may be used as a mixture. The mixing ratio of these (meth) acrylates is 0 to 50 parts by weight, preferably 0 to 30 parts by weight, based on 100 parts by weight of the resin for a photosensitive coating. If the compounding ratio of the (meth) acrylates exceeds 50 parts by weight, the coating film tends to exhibit tackiness, which is not preferable.

The photopolymerization initiator may be a known one, and examples thereof include benzoin and its ethers, benzylalkyl ketals, benzophenone derivatives, anthraquinone derivatives, and thioxanthone derivatives. Good. The addition amount of the photopolymerization initiator is preferably 0.1 to 30 parts by weight, particularly preferably 0.5 to 2 parts by weight, based on 100 parts by weight of the resin for photosensitive coating.
The range is 0 parts by weight. The amount of photopolymerization initiator added is 0.1
If the amount is less than 30 parts by weight, the photocurability is insufficient. If the amount is more than 30 parts by weight, the curing proceeds excessively, and the strength of the coating film becomes insufficient.

The organic solvent used for dispersing or dissolving the components of the photosensitive coating may be any organic solvent which can dissolve the above-mentioned prepolymer or resin, and various glycol ethers such as ethylene glycol Monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, propylene glycol monomethyl ether, propylene glycol monophenyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether and the like; ketones, for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone,
Ethers such as dibutyl ether, dioxane, tetrahydrofuran and the like; alcohols such as methoxybutanol, diacetone alcohol, butanol, isopropanol and the like; hydrocarbons such as toluene, xylene, hexane and the like; esters,
For example, ethyl acetate, butyl acetate, 2-methoxyethyl acetate, 2-methoxypropyl acetate and the like can be mentioned, and when used, they can be used alone or as a mixture.

These organic solvents are used to facilitate solubilization and dispersion, to improve bath stability, to obtain a smooth coating film, etc., and to dissolve the cationic resin or anionic resin in water. It can be added at the time of chemical conversion or aqueous dispersion.

The hue of the dye and / or pigment to be added to the photosensitive coating if necessary can be appropriately selected according to the purpose. However, in order to prevent light leakage, a dark color is preferable.
Particularly preferred are hues such as black, dark blue, dark purple, dark brown and the like.

It is desirable to select a dye and / or a pigment which does not impair the stability of the paint, if necessary, the electrodeposition properties and the durability of the coating film. In this respect, the dye is preferably an oil-soluble or dispersible dye, and specific examples thereof include azo, anthraquinone, benzodifuranone, and condensed methine. As the pigment, for example, azo lake-based, quinacridone-based, phthalocyanine-based, isoindolinone-based, anthraquinone-based, thioindigo-based organic pigments, graphite, iron oxide, chromium vermillion, chrome green, ultramarine, navy blue, cobalt blue, Inorganic pigments such as cobalt green, emerald green and carbon black are suitable. In addition, two or more kinds of the dyes and / or pigments may be used in combination according to the intended hue, as long as the properties are not impaired. For the dye and / or pigment, “COLOUR INDEX” or the like may be appropriately referred to.

The use ratio of the dye and / or pigment is as follows:
Purpose, hue, type of dye and / or pigment used,
It is appropriately selected depending on the thickness of the photosensitive paint when it is dried, and is preferably 3 to 70% by weight, particularly preferably about 5 to 60% by weight, based on the entire photosensitive paint.

Further, the obtained coating film can be made light-transmitting or light-shielding depending on the kind and the use ratio of the dye and / or pigment, and can be appropriately selected depending on the purpose. For example, a black and light-shielding coating film can be obtained by using carbon black or the like as a pigment in a range of 3 to 34% by weight based on the entire photosensitive paint. The black and light-shielding coating film is particularly preferred for the purpose of preventing light leakage. The color of the dye and / or pigment includes white. Furthermore, the dye and / or pigment to be used is preferably used after being purified to remove impurities in order to obtain a good coating film. Further, various assistants such as a dispersing aid for the dye or pigment, a leveling agent for improving the smoothness of the coating film, a viscosity modifier, and an antifoaming agent may be added to the photosensitive paint.

The preparation of the photosensitive paint is carried out by preparing a resin for a photosensitive paint, a photopolymerization initiator, an organic solvent and / or water, a dye and / or a pigment, if necessary, an acidic or basic substance, a dye or a pigment. A dispersion aid, a leveling agent for improving the smoothness of the coating film, a viscosity adjuster, various assistants such as an antifoaming agent are mixed, and a commonly used dispersing machine such as a sand mill, a roll mill, and an attritor is mixed. It can be obtained by a method of sufficiently dispersing by using such a method. The thickness of the photosensitive coating film formed by the photosensitive coating obtained in this manner is not particularly limited, and can be appropriately selected depending on the performance required for the color filter.
m, preferably about 1 to 3 μm. In order to adjust the film thickness, for example, when a photosensitive coating is formed by an electrodeposition method, it can be controlled by adjusting the electrodeposition conditions such as voltage, electrodeposition time, and liquid temperature. It can be carried out under the same conditions as the electrodeposition coating of paint.

In the present invention, it is necessary to expose the photosensitive coating film through a negative mask having a pattern having at least three different light transmittances. Here, the light transmittance refers to the ratio of the intensity before and after the light beam used for exposure passes through the negative mask. The number of light transmittance stages having different patterns of the negative mask is at least three.
The number of stages is sufficient, and it can be determined according to the number of types of coloring paints to be used. The difference in light transmittance between each stage can be appropriately selected according to exposure conditions and development conditions described later. In general, it is preferable to increase the relative difference between the light transmittances because the exposure amount and the exposure time can be easily adjusted. However, even when the difference in the light transmittance is small, the exposure amount is increased. Alternatively, the same object can be achieved by increasing the exposure time. Therefore, the relative difference in light transmittance is not particularly limited, but it is preferable that the difference has a significant difference of usually 5% or more.

The exposure can be usually carried out using a device capable of generating a large amount of ultraviolet rays. For example, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a metal halide lamp or the like can be used as a light source. May be. Exposure conditions can be appropriately selected according to the photosensitive paint used, the exposure apparatus, the negative mask, and the like.

In the step (A) of the present invention, the photosensitive coating film is exposed through a negative mask having at least three different light transmittance patterns, so that the light transmittance of the negative mask pattern is different. As many as
Different exposure states can be formed.

In the production method of the present invention, following the step (A), the operation of developing and removing the photosensitive coating on the pattern portion and electrodepositing a colored paint on the exposed conductive layer to form a colored layer is performed. The coloring layer is formed by sequentially repeating the pattern portions corresponding to the light transmittance of the negative mask in ascending order (hereinafter, referred to as a step (B)). That is, (B)
In the process, first, the photosensitive coating film of the portion corresponding to the pattern having the minimum light transmittance of the negative mask is selectively developed and removed, and a colored paint is electrodeposited on the exposed conductive layer to form a colored layer, Next, the process of selectively developing and removing the photosensitive coating in the portion corresponding to the pattern having the next lowest light transmittance of the negative mask and electrodepositing a coloring paint on the exposed conductive layer to form a coloring layer is sequentially performed. By repeating, a colored layer can be formed.

The conditions for selectively developing and removing the photosensitive coating film include the exposure amount of the portion to be selectively removed, the solubility of the photosensitive coating material used in the developing solution, the type and concentration of the developing solution,
Furthermore, the temperature can vary depending on the development temperature and the development time, and conditions suitable for the resin used for preparing the photosensitive paint may be appropriately selected. Specifically, for example, when a cationic resin is used as a component of the photosensitive paint, an aqueous solution in which an acidic substance is dissolved can be used as a developer. Examples of the acidic substance include formic acid, acetic acid, propionic acid,
Examples thereof include organic acids such as lactic acid and inorganic acids such as hydrochloric acid and phosphoric acid. For example, when lactic acid is used in the developer, the lactic acid concentration is usually 0.01 to 50% by weight, preferably 0.01 to 3% by weight.
0% by weight, the temperature is usually 10 to 70 ° C, preferably 20 to 70 ° C.
The development time at 50 ° C. may be appropriately selected from the range of usually 5 to 600 seconds. When an anionic resin is used as a component of the photosensitive paint, an aqueous solution in which a basic substance is dissolved can be used as a developer. Examples of the basic substance include sodium carbonate, sodium hydrogen carbonate, sodium metasilicate, tetraalkylammonium hydroxide, sodium hydroxide, potassium hydroxide, and the like.For example, when an aqueous solution of sodium carbonate is used for a developer, The concentration of sodium carbonate is usually 0.01 to 25% by weight, preferably 0.05 to 15% by weight, and the temperature is usually 10%.
To 70 ° C., and the development time is usually 5 to 600 seconds, preferably 5 to 600 seconds.
What is necessary is just to select suitably from the range of -300 seconds. Further, organic solvents such as alcohols, glycol ethers, ketones, and chlorinated hydrocarbons can be used as the developer. Further, a surfactant or an antifoaming agent may be added to these developers for improving wettability or defoaming, and it is preferable to use an aqueous solution type developer in view of toxicity and working environment. .

Next, after the development, a colored paint is electrodeposited on the exposed conductive layer to form a colored layer.

The coloring paint uses, for example, a cationic or anionic resin as a film-forming component, adds a dye and / or a pigment as a coloring component, and further dissolves in water by using an acidic or basic substance. Alternatively, a dispersed paint or the like can be used, and further, an organic solvent or the like for facilitating dissolution and / or dispersion of the resin in the colored paint, improving bath stability or obtaining a smooth coating film, or the like. May be added.

The cationic resin is, for example, a resin in which an onium group such as an amino group, ammonium, or sulfonium is introduced into an acrylic resin, an epoxy resin, a urethane resin, a polybutadiene resin, a polyamide resin, or the like. Formic acid, acetic acid, propionate, and the like. Examples thereof include a resin solubilized or dispersed in water with an acid such as an acid and lactic acid or an acidic substance.

The anionic resin is, for example, a resin obtained by introducing a carboxyl group or the like into an acrylic resin, a polyester resin, a maleated oil resin, a polybutadiene resin, an epoxy resin, or the like, such as triethylamine, diethylamine, dimethylethanolamine, or ammonia. And solubilized or dispersed in water with a basic substance such as Furthermore, the film-forming component of the colored paint may have photosensitivity, and among the prepolymers and resins used for the photosensitive coating film in the step (A), those suitable for electrodeposition may be used. The photopolymerization initiator may be used in combination.

It is desirable to use different types, hues, color densities, and shades of color for each part having a different light transmittance as the coloring paint used in the step (B). it can.

The hue of the colored paint can be appropriately selected according to the purpose. For example, the photosensitive paint used in the step (A) and the colored paint used in the step (B), and further, each colored paint used when the step of electrodepositing the colored paint in the step (B) is performed a plurality of times. Can have different hues.

The dye and / or pigment to be used in the colored paint is selected according to the desired hue. However, the transparency of the obtained coating film, the stability of the coating material, the electrodeposition characteristics, the durability of the coating film, etc. It is desirable to select a dye that does not cause a problem.In this regard, as the dye, an oil-soluble or dispersible dye, specifically, for example, an azo type, an anthraquinone type, a benzodifuranone type, a condensed methine type, and the like are mentioned. For example, azo lake-based, quinacridone-based, phthalocyanine-based, isoindolinone-based, anthraquinone-based, thioindigo-based organic pigments, graphite, iron oxide, chromium vermillion, chrome green, ultramarine, navy blue, cobalt blue, cobalt green, emerald Inorganic pigments such as green, titanium white and carbon black can be mentioned. In addition, the above dye and / or
Or a pigment, as long as its properties are not impaired,
More than one kind can be mixed and used.

The preparation of the above-mentioned colored coating composition includes a resin, a dye and / or a pigment, an acidic substance or a basic substance, and if necessary, an organic solvent, a dispersing aid for the dye or pigment, a leveling agent for improving the smoothness of the coating film, Viscosity adjusting agent, various auxiliary agents such as antifoaming agent and the like are mixed, and commonly dispersed using a commonly used dispersing machine such as a sand mill, a roll mill, and an attritor. The method can be carried out by, for example, diluting the solid content to about 4 to 25% by weight, particularly preferably 7 to 20% by weight, to obtain a coating suitable for electrodeposition. The colored paint obtained in this way is
A colored layer is formed by electrodeposition coating on the conductive layer.

The thickness of the colored layer is not particularly limited and can be appropriately selected according to the performance required of the color filter. The thickness is usually 0.3 to 5 μm, preferably 1 to 3 μm when dried.
m.

The conditions for the electrodeposition coating are appropriately selected according to the type of the coloring paint to be used and the intended thickness of the coloring layer, but the voltage is usually 5 to 500 V, preferably 10 to 30 V.
0 VDC is preferable, and the electrodeposition time is usually 5 to 3 times.
00 seconds, preferably 10 to 200 seconds, the liquid temperature is usually 10 to
The temperature is desirably 35 ° C, preferably 15 to 30 ° C.
At this time, when the electrodeposition time for obtaining the desired film thickness has elapsed, the energization is stopped, the substrate is taken out of the bath, and the excessively attached bath liquid is thoroughly washed with water or the like and dried to form a colored layer. it can.

The drying conditions can be appropriately selected depending on the conditions of the subsequent steps, etc., but may be any conditions under which the water on the surface can be dried, for example, 120 ° C. or less, preferably 30 ° C. to 1
It is desirable to dry at 00 ° C. for usually 1 to 20 minutes, preferably about 2 to 10 minutes. If the drying temperature is higher than 120 ° C., the photosensitive coating may be cured by heat,
This is not preferable because later development work becomes difficult.

In the production method of the present invention, the colored layer obtained in the step (B) is then transferred onto a transfer substrate (hereinafter referred to as a step (C)).

The transfer substrate is not particularly limited, and can be variously selected according to the intended use, such as a transparent substrate, a translucent substrate, a colored substrate, and the like. Preferably, a transparent substrate such as glass or plastic is used. For example, glass, polyester, polysulfone, cellulose triacetate, polycarbonate, polyimide, polystyrene, polymethylpentene, or the like can be used.

For the transfer, a method of pressing the colored layer so as to contact the transfer substrate or the like can be used. The pressing can be performed using a press or a covering roller, and in this case, heating may be performed as necessary. When the colored layer is photosensitive, it can be cured by light irradiation and transferred. Further, in order to easily perform the transfer, a transparent adhesive such as a photocurable, pressure-sensitive or hot-melt type may be applied to the surface of the transfer substrate. After the transfer step, heating and light irradiation are performed again to sufficiently cure the resin, and the weather resistance and chemical resistance can be further improved. Specifically, when the reheating is performed, it varies depending on the resin used, but is preferably 50 to 250 ° C, particularly preferably 100 to 200 ° C.
It is desirable to heat in the range of 5 ° C. for 5 minutes to 1 hour, particularly in the range of 10 to 30 minutes. Furthermore, the substrate having the conductive layer on the surface after the transfer can be reused.

The target color filter can be produced by the above steps (A), (B) and (C). However, if necessary, heating, curing or photo-curing is carried out to obtain weather resistance and resistance to light. Chemical properties and the like can be further improved. When performing the heating and curing, for example, the temperature is usually 100 to 250 ° C., preferably 150 to 250 ° C.
C. and 5 minutes to 1 hour, preferably 15 to 40 minutes.

Hereinafter, the steps of the present invention will be described with reference to FIGS. 1, 2 and 3, but the present invention is not limited thereto.

FIG. 1 is a process diagram showing one embodiment of the present invention, and FIG. 2 is an enlarged schematic view of a negative mask having different light transmittances in four stages among embodiments of a negative mask used in the present invention. 1, a portion corresponding to a light shielding film having a light transmittance of 100%;
2 is a portion corresponding to the first color having a light transmittance of 5%, and 3 is a light transmittance of 2
A portion corresponding to the second color of 5% and a portion 4 corresponding to the third color having a light transmittance of 80% are shown. FIG. 3 is an enlarged schematic view of a negative mask having different light transmittances in three stages among the embodiments of the negative mask used in the present invention, wherein 5 is a portion corresponding to a third color having a light transmittance of 100%, and 6 is light. Reference numeral 7 denotes a portion corresponding to a first color having a transmittance of 5%, and reference numeral 7 denotes a portion corresponding to a second color having a transmittance of 25%.

First, a black photosensitive coating film (which becomes a light-shielding film) is formed on a substrate having a conductive layer on the surface, and the dried substrate is exposed through, for example, a negative mask shown in FIG.
The first development is performed to expose a portion of the conductive layer corresponding to the first color-corresponding portion 2 of the negative mask having a light transmittance of 5%. After dressing,
Wash with water.

Next, a second development (under different conditions from the first development) is performed, and the light transmittance of the negative mask is 25.
% Of the conductive layer corresponding to the second color equivalent portion 3 is exposed, electrodeposited in an electrodeposition bath containing a second color coloring paint, and washed with water.

Further, a third development (under different conditions from the first and second developments) is performed, and the conductivity of the portion corresponding to the third color equivalent portion 4 having a light transmittance of the negative mask of 80% is performed. The layer is exposed, electrodeposited in an electrodeposition bath containing a third color paint, washed with water and dried to form a colored layer having a light-shielding film. Next, the color filter of the present invention can be obtained by transferring the colored layer formed on this substrate to a transfer substrate. The same operation can be performed when the negative mask shown in FIG. 3 is used. In the present invention, a coating obtained by dissolving and / or dispersing a cationic resin in water as a photosensitive coating is applied by an electrodeposition method, and a colored layer is formed by a colored coating prepared using an anionic resin. It is particularly preferable to use a method in which an anionic resin is dissolved and / or dispersed in water as a photosensitive coating, or a method in which a colored layer is formed using a colored coating prepared with a cationic resin.

[0053]

The method for producing the color filter of the present invention is as follows.
It does not require advanced fine processing technology, can increase the degree of freedom of the pattern shape of the colored layer, can perform all patterning with a single exposure, and can easily cope with an increase in size. In addition, since there is no need to provide an electrode between the coloring layer and the substrate, the driving voltage can be reduced, and a color filter without a decrease in light transmittance can be easily and mass-produced. Useful.

[0054]

EXAMPLES The present invention will be specifically described below with reference to Synthesis Examples and Examples, but the present invention is not limited thereto.

[0055]

Synthesis Example 1 Synthesis of photosensitive resin (A-1) Synthesis of amine-added epoxidized polybutadiene (a-1) Epoxidized liquid polybutadiene (Nippon Petrochemical Co., Ltd.)
Manufacture, trade name "E-1000-8", number average molecular weight 1,0
(00, oxirane oxygen content 8%) 1,000 g was charged into a 2-liter separable flask equipped with a thermometer, a stirrer and a reflux condenser, and the system was purged with nitrogen. In addition, 17
The reaction was performed at 0 ° C. for 5 hours. Next, unreacted methylethanolamine was distilled off under reduced pressure, and the amine value was 230.4 mmol.
/ 100 g of amine-added epoxidized polybutadiene (a
-1) was obtained.

Synthesis of Unsaturated Group-Containing Isocyanate Compound In a heatable and coolable 2 liter round bottom flask equipped with a thermometer, a stirrer, a reflux condenser and a dropping funnel,
After 435.5 g of 2,4-tolylene diisocyanate and 266.1 g of diethylene glycol dimethyl ether were charged and heated to 40 ° C., 362.8 g of 2-hydroxyethyl acrylate was added dropwise from a dropping funnel. At this time, 200 ppm of parabenzoquinone was also added. Although heat was generated by dropping of 2-hydroxyethyl acrylate, it was cooled and kept at the same temperature as required. After completion of the dropping of 2-hydroxyethyl acrylate, the temperature was raised to 70 ° C., and the reaction was carried out at the same temperature for 3 hours. The infrared absorption spectrum analysis showed that the absorption intensity of the isocyanate group became almost half that before the start of the reaction. After confirmation, the mixture was cooled to obtain an unsaturated group-containing isocyanate compound (a-2).

Synthesis of photosensitive resin (A-1) In a 2 liter separable flask, (a-1) 50
0 g of diethylene glycol dimethyl ether 166.
Dissolved in 7 g, and (a- 2 ) 713.4 g (0.1 equivalent of a hydroxyl group in (a-1) isocyanate group).
(8 equivalents) was added dropwise at 40 ° C., and the mixture was further reacted at the same temperature for 1 hour. Infrared absorption spectrum analysis confirmed that the isocyanate group had disappeared, and (a-1) was added to (a-2).
Was added to obtain a photosensitive resin (A-1).

[0058]

Synthesis Example 2 Synthesis of Polyamine (A-2) Solution "Nisseki Polybutadiene B-1000" (trade name, manufactured by Nippon Petrochemical Co., Ltd., number average molecular weight 1,000, iodine value 4)
1,000 g, 554 g of maleic anhydride, 10 g of xylene and 3.0 g of trimethylhydroquinone were added to a 3-liter separable tube equipped with a thermometer, a stirrer, a reflux condenser and a nitrogen inlet tube. The flask was charged and reacted at 190 ° C. for 5 hours under nitrogen. Then, unreacted maleic anhydride and xylene were distilled off to obtain a maleated polybutadiene having a total acid value of 400 mgKOH / g.

Next, the maleated polybutadiene 1,1 was placed in a 3-liter separable flask equipped with a reflux condenser.
000 g, ethylene glycol monobutyl ether 43
After charging 3 g and dissolving uniformly, 1 g under nitrogen flow.
While maintaining the temperature at 35 ° C., 364.3 g of N, N-dimethylaminopropylamine was added dropwise over 1 hour. The mixture was further kept at the same temperature for 5 hours to obtain a polyamine (A-2) solution having a tertiary amino group and an imide group. The resulting polyamine (A-2) solution contained 206 mmol of a tertiary amine per 100 g of the solution, and had a nonvolatile content of 75.0% by weight.

[0060]

Synthesis Example 3 Synthesis of half esterified product (A-3) solution "Nisseki polybutadiene B-1000" (manufactured by Nippon Petrochemical Co., Ltd., trade name, number average molecular weight 1,000, iodine value 4)
1,000 g, 554 g of maleic anhydride, 10 g of xylene and 3.0 g of trimethylhydroquinone were added to a 3-liter separable tube equipped with a thermometer, a stirrer, a reflux condenser and a nitrogen inlet tube. The flask was charged and reacted at 190 ° C. for 5 hours under nitrogen. Then, unreacted maleic anhydride and xylene were distilled off to obtain a maleated polybutadiene having a total acid value of 400 mgKOH / g.

Next, the above maleated polybutadiene 1,1 was placed in a 3-liter separable flask equipped with a reflux condenser.
000 g, diethylene glycol dimethyl ether 46
1.8 g, 3.0 g of N, N-dimethylbenzylamine and 385.5 g of benzyl alcohol were charged and uniformly dissolved, and then reacted at 120 ° C. for 2 hours under a nitrogen stream to obtain a half-esterified product (A-3) A solution was obtained. The total acid value of the obtained half esterified product (A-3) solution was 109.3 mgK.
OH / g, and the nonvolatile content was 75.0% by weight.

[0062]

Synthesis Example 4 Synthesis of Resin (A-4) Maleated polybutadiene 400 obtained in Synthesis Example 3
g, diethylene glycol dimethyl ether 188.5
g and 0.4 g of hydroquinone were charged into a 2-liter separable flask equipped with a reflux condenser, heated to 80 ° C., stirred and made uniform. Then 165.6 g of 2-hydroxyethyl acrylate and 20 g of triethylamine
Was added, and the mixture was reacted at the same temperature for 2 hours to obtain a solution of a half esterified maleated polybutadiene (A-4). The total acid value of the obtained half esterified product (A-4) solution is 105 mgK.
OH / g, and the nonvolatile content was 75.0% by weight.

[0063]

Synthesis Example 5 Preparation of Black Photosensitive Paint (B -1) To 500 g of the photosensitive resin (A-1) obtained in Synthesis Example 1,
As a photopolymerization initiator, 27.0 g of “Irgacure 907” (trade name, manufactured by Ciba Geigy), “KAYAC
2. URE DETX (trade name, manufactured by Nippon Kayaku Co., Ltd.)
0 g and 37.5 g of carbon black # 5B (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.) were added under stirring and mixed, and then, using a laboratory roll mill (manufactured by Kodaira Seisakusho), the carbon black particle size was 0.3 μm or less. And dispersed until The particle size was measured using Coulter Counter N4 (manufactured by Coulter Counter).

The above dispersion mixture was mixed with acetic acid 1 as a neutralizing agent.
After adding 6.7 g, sufficiently stirring and homogenizing again, the dispersion is dispersed in water while slowly adding deionized water and stirring vigorously with a high-speed mixer to obtain a black photosensitive paint having a solid concentration of 15% by weight (B-1). An aqueous solution (cationic electrodeposition type) was prepared.

[0065]

Synthesis Example 6 Preparation of Black Photosensitive Paint (B-2 ) To 500 g of the photosensitive resin (A-1) obtained in Synthesis Example 1,
As a photopolymerization initiator, 27.0 g of “Irgacure 907” (trade name, manufactured by Ciba Geigy), “KAYAC
2. URE DETX (trade name, manufactured by Nippon Kayaku Co., Ltd.)
0 g and 37.5 g of carbon black # 5B (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.) with stirring and mixing. And dispersed until The particle size was measured using Coulter Counter N4 (manufactured by Coulter Counter Co.).

The above-mentioned dispersion mixture was prepared so that the solid concentration was 40% by weight.
Then, the mixture was diluted with methyl ethyl ketone to prepare a black photosensitive coating solution (B-2).

[0067]

Synthesis Example 7 Preparation of Red Photosensitive Paint (B-3) Pigment Red 4 which is an azo metal salt red pigment instead of carbon black # 5B (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.)
A red photosensitive paint (B-3) aqueous solution (cationic electrodeposition type) having a solid content of 15% by weight was prepared in the same manner as in Synthesis Example 5 except that BS (manufactured by Sanyo Pigment Co., Ltd.) was used.

[0068]

Synthesis Example 8 Preparation of Black Photosensitive Paint (B-4) Half-esterified product (A-4) solution 50 obtained in Synthesis Example 4
0 g of “Irgacure 90” as a photopolymerization initiator.
7 "(trade name, manufactured by Ciba Geigy), 27.0 g," K
AYACURE DETX "(trade name, manufactured by Nippon Kayaku Co., Ltd.) and 37.5 g of carbon black # 5B (Mitsubishi Kasei Kogyo Co., Ltd.) were added under stirring and mixed.
In a laboratory three-roll mill (manufactured by Kodaira Seisakusho), the particles were dispersed until the carbon black particle size became 0.3 μm or less.
The particle size was measured using Coulter Counter N4 (manufactured by Coulter Counter Co.).

To the above dispersion mixture, 33.7 g of a neutralizing agent, triethylamine, was added, and the mixture was sufficiently stirred and homogenized again. Then, while adding deionized water slowly, the mixture was vigorously stirred with a high-speed mixer and dispersed in water. Minute concentration 15
% By weight of an aqueous solution (anion electrodeposition type) of a black photosensitive paint (B-4).

[0070]

Synthesis Example 9 Preparation of Red Photosensitive Paint (B-5) Instead of carbon black # 5B (manufactured by Mitsubishi Kasei Kogyo Co., Ltd.), Pigment Red 4 which is an azo metal salt red pigment
A red photosensitive paint (B-5) aqueous solution (anion electrodeposition type) having a solid content of 15% by weight was prepared in the same manner as in Synthesis Example 8 except that BS (manufactured by Sanyo Pigment Co., Ltd.) was used.

[0071]

[Synthesis Example 10] Coloring paint (C-1, C-2, C-3)
The prepared half-esterified solution (A-3) and the pigment were mixed with stirring, and the mixture was mixed with a laboratory three-roll mill (manufactured by Kodaira Seisakusho).
The particles were dispersed until the pigment particle size became 0.3 μm or less. The particle size was measured using Coulter Counter N4 (manufactured by Coulter Counter Co.). Then, triethylamine as a neutralizing agent was added to the obtained dispersion mixture, and the mixture was sufficiently stirred and homogenized again. After that, the solid content concentration was 10 wt. % Of colored paints (C-1, C-2, C-3) were prepared. The three colored paints obtained (anion electrodeposition type)
The composition of the aqueous solution is shown in Table 1 (the numerical values in Table 1 are all parts by weight).

[0072]

[Table 1]

[0073]

[Synthesis Example 11] Coloring paint (C-4, C-5, C-6)
The prepared polyamine (A-2) solution and the pigment were mixed with stirring, and dispersed using a laboratory three-roll mill (manufactured by Kodaira Seisakusho) until the pigment particle size became 0.3 μm or less. The particle size was measured using Coulter Counter N4 (manufactured by Coulter Counter). To the obtained dispersion mixture, acetic acid as a neutralizing agent was added, and the mixture was sufficiently stirred and homogenized again. After that, the mixture was dispersed in water while stirring vigorously with a high-speed mixer while slowly adding deionized water to obtain a solid concentration of 10%. % By weight of a coloring paint (C-4, C-5, C-6) was prepared. Table 2 shows the compositions of the obtained three colored paint (cationic electrodeposition type) aqueous solutions.
(Each numerical value in Table 2 is part by weight).

[0074]

[Table 2]

[0075]

Synthesis Example 12 Synthesis of UV-curable pressure-sensitive adhesive 2-ethylhexyl acrylate 80 parts by weight, tetrahydrofurfuryl acrylate 5 parts by weight, acrylic acid 15
A mixture of 4 parts by weight of α, α′-azobisisobutyronitrile and 200 parts by weight of toluene was reacted at 80 ° C. for 8 hours while stirring in a nitrogen stream to obtain a copolymer solution. Then, the temperature was raised to 100 ° C., and a mixed solution of 5 parts by weight of glycidyl methacrylate, 0.5 parts by weight of triethylbenzylammonium chloride and 0.1 parts by weight of methoquinone was added dropwise over 30 minutes, and reacted at the same temperature for 20 hours. A polymer was obtained. 5 parts by weight of “Irgacure 907” (trade name, manufactured by Ciba Geigy) was added as a photopolymerization initiator to the obtained prepolymer to obtain an ultraviolet-curable pressure-sensitive adhesive.

[0076]

Example 1 DC voltage was applied to a copper-clad glass epoxy laminate (hereinafter, referred to as an original plate 1) whose surface was polished smoothly as a cathode and a stainless steel beaker containing an aqueous solution of black photosensitive paint (B-1) as an anode. 3 at 30V, 25 ° C
Electrodeposited for minutes. After washing the original 1 with ion exchanged water,
Dry and cool at 0 ° C for 5 minutes.
A black uniform coating film of μm was formed.

Next, a negative mask shown in FIG. 2 having a pattern having different light transmittances in four stages is adhered onto the coating film, and a UV exposure apparatus having a high-pressure mercury lamp (trade name “JL-”, manufactured by Oak Manufacturing Co., Ltd.) 3300 ")
Irradiation with ultraviolet light of J / cm ² was performed. Next, a concentration of 0.05% by weight
When developed with an aqueous solution of lactic acid, the black photosensitive paint in the portion of the negative mask having the lowest light transmittance is selectively removed,
The copper surface has been exposed. After washing and drying, the original plate 1 is used as the anode,
Using a stainless steel beaker containing the coloring paint (C-1) as a cathode, a DC voltage of 30 V was applied at 25 ° C. for 3 minutes to perform electrodeposition. After washing the original plate 1 with deionized water,
Dry at 80 ° C. for 5 minutes, and exhibit a non-tacky thickness at room temperature.
A red colored layer of μm was formed. Then, when developed with a 0.5% by weight aqueous solution of lactic acid, no change was observed in the portion corresponding to the red colored layer and the light-shielding layer, and the black photosensitive portion of the portion having the second lowest light transmittance of the negative mask was observed. Paint was selectively removed. Next, after washing with water and drying, the colored paint (C-
In the same manner as in the electrodeposition of 1), the coloring paint (C-2) was electrodeposited at a DC voltage of 30 V and a temperature of 25 ° C. for 3 minutes, and then washed with ion-exchanged water. No change was observed in the black photosensitive paint portion corresponding to the layer and the light-shielding layer, and a green colored layer was formed. After drying at 80 ° C. for 5 minutes and then developing with a 3.0% by weight aqueous lactic acid solution, no change was observed in the red and green colored layers.
Also, no change was observed in the black photosensitive paint portion serving as the light-shielding film, and the black photosensitive paint in the portion of the negative mask having the third lowest light transmittance was selectively removed. Next, after washing with water and drying, the colored paint (C-3) was electrodeposited for 3 minutes at a DC voltage of 25 V and 30 ° C. in the same manner as the electrodeposition of the colored paint (C-1). When the master plate 1 was washed with ion-exchanged water, no change was observed in the black photosensitive paint portion corresponding to the previously formed red and green colored layers and the light-shielding layer, and a blue colored layer was formed. After drying at 80 ° C. for 5 minutes, a colored layer having a light-shielding layer was obtained.

Next, the ultraviolet-curable pressure-sensitive adhesive prepared in Synthesis Example 12 was applied on a transparent substrate for transferring the obtained colored layer so as to have a thickness of 0.5 μm by a spin coating method. After irradiating with UV light of cm ² , the colored layer was transferred onto a transparent substrate by pressing with a rubber roller so that the surface of the colored layer of the original 1 was in contact with the adhesive, and the original 1 was peeled off. It was then baked at 160 ° C. for 30 minutes for further curing. The thickness of each of the colored layer and the light-shielding layer after curing was 1.9 μm, and a color filter having a uniform colored layer excellent in transparency was obtained.

[0079]

Example 2 A black photosensitive paint (B-4) was prepared by using a 0.3 mm thick polyethylene terephthalate film (hereinafter referred to as an original plate 2) having an 80 nm thick ITO (indium-tin oxide) film on its surface as an anode. Using a stainless steel beaker containing an aqueous solution as a cathode, DC voltage 25 V, 25 ° C.
Electrodeposition was performed for 3 minutes under the conditions described above. The master plate 2 was washed with ion-exchanged water, dried and cooled at 80 ° C. for 5 minutes to form a 1.8 μm-thick black uniform coating film having no tackiness.

Next, a negative mask shown in FIG. 2 having a pattern in which the light transmittance was changed in four stages was adhered onto the coating film, and the UV exposure apparatus was used in the same manner as in Example 1 to obtain 600 mJ / cm.
Irradiation of ultraviolet light of ² . Next, when developed with an aqueous solution of sodium carbonate having a concentration of 0.1% by weight, the black photosensitive paint in the portion of the negative mask having the lowest light transmittance was selectively removed, exposing the ITO film. After washing with water and drying, the original plate 2 was used as a cathode, and a stainless steel beaker containing a coloring paint (C-4) was used as a cathode and electrodeposited at a DC voltage of 30 V and a temperature of 25 ° C. for 3 minutes. The original plate 2 was washed with ion-exchanged water and dried at 80 ° C. for 5 minutes to form a red colored layer. Then, when developed with a 0.75% by weight aqueous solution of sodium carbonate, no change was observed in the black photosensitive paint portion corresponding to the red coloring layer and the light-shielding layer, and the light transmittance of the negative mask was the second lowest. A portion of the black photosensitive paint was selectively removed. Next, after washing with water and drying, the colored paint (C-
In the same manner as in the electrodeposition of 4), the coloring paint (C-5) was electrodeposited for 3 minutes under the conditions of a DC voltage of 30 V and 25 ° C.
Was washed with ion-exchanged water. As a result, no change was observed in the previously formed red colored layer and the black photosensitive paint portion corresponding to the light-shielding layer, and a green colored layer was formed. 80
After drying at 5 ° C. for 5 minutes and then developing with a 5% by weight aqueous solution of sodium metasilicate, no change was observed in the red and green colored layers, and no change was observed in the black photosensitive paint portion corresponding to the light-shielding layer. The light transmittance of the negative mask
The third lowest portion of the black photosensitive paint was selectively removed. Then, after washing with water and drying, in the same manner as in the electrodeposition of the colored paint (C-4), the colored paint (C-6) was applied with a DC voltage of 30 V,
Electrodeposition was performed at 25 ° C. for 3 minutes. When the original plate 2 was washed with ion-exchanged water, no change was observed in the previously formed red and green colored layers and the black photosensitive paint portion corresponding to the light-shielding layer, and a blue colored layer was formed. After drying at 80 ° C. for 5 minutes, a colored layer having a light-shielding layer was obtained.

Then, the colored layer was transferred onto the transparent glass substrate by pressing with a rubber roller so that the surface of the colored layer of the original plate 2 was in contact with the substrate, and the original plate 1 was peeled off. Further, baking was performed at 160 ° C. for 30 minutes in order to complete the curing. The thickness of each of the colored layer and the light-shielding layer after curing was 1.8 μm, and a color filter having a uniform colored layer excellent in transparency was obtained.

[0082]

Example 3 A DC voltage was applied to a copper-clad glass epoxy laminate (hereinafter, referred to as an original plate 3) having a smooth polished surface as a cathode and a stainless steel beaker containing an aqueous solution of a red photosensitive paint (B-3) as an anode. 3 at 30V, 25 ° C
Electrodeposited for minutes. After washing the original plate 3 with ion-exchanged water,
Dry and cool at 0 ° C for 5 minutes.
A red uniform coating film of μm was formed.

Next, a negative mask having a pattern having three different light transmittances shown in FIG. 3 was adhered onto the coating film, and a UV exposure apparatus having a high-pressure mercury lamp (trade name “JL- manufactured by Oak Manufacturing Co., Ltd.) was used. 3300 ")
Irradiation with ultraviolet light of J / cm ² was performed. Next, a concentration of 0.05% by weight
When developed with an aqueous lactic acid solution, the red photosensitive paint in the portion of the negative mask having the lowest light transmittance is selectively removed,
The copper surface has been exposed. After washing with water and drying, the original plate 3 is used as the anode,
Using a stainless steel beaker containing the coloring paint (C-2) as a cathode, a DC voltage of 25 V and a temperature of 25 ° C.
Electrodeposited for minutes. After washing the original plate 3 with ion-exchanged water,
Dried at 0 ° C for 5 minutes, 2 μm in thickness showing no tack at room temperature
m colored layers were formed. Then, when developed with a 0.5% by weight aqueous solution of lactic acid, no change was observed in the red and green colored layers, and the red photosensitive paint in the portion having the second lowest light transmittance of the negative mask was selectively formed. Removed.
Next, after washing with water and drying, the coloring paint (C-3) is applied to the coating composition (C-3) at a DC voltage of 25 V and 25 ° C.
After electrodeposition for 3 minutes under the conditions described above, washing with ion-exchanged water showed no change in the previously formed red and green colored layers, and a blue colored layer was formed. 5 at 80 ° C
After drying for a minute, a colored layer was formed.

Next, the ultraviolet-curable pressure-sensitive adhesive prepared in Synthesis Example 12 was applied on a transparent substrate for transferring the obtained colored layer so as to have a thickness of 0.5 μm by a spin coating method. After irradiating ultraviolet rays of cm ² , the colored layer was transferred onto a transparent substrate by pressing with a rubber roller so that the surface of the colored layer of the original plate 3 was in contact with the adhesive, and the original plate 3 was peeled off. It was then baked at 160 ° C. for 30 minutes for further curing. The thickness of each of the colored layer and the light-shielding layer after curing was 1.9 μm, and a color filter having a uniform colored layer excellent in transparency was obtained.

[0085]

Example 4 A black photosensitive coating solution (B-2) was spray-coated on the same laminate as used in Example 1, air-dried, and dried at 80 ° C. for 5 minutes. A 1.9 μm black uniform coating film was formed.

Next, a negative mask shown in FIG. 2 having a pattern having different light transmittances in four stages is closely adhered onto the coating film, and a UV exposure apparatus having a high-pressure mercury lamp (trade name “JL-3300” manufactured by Oak Manufacturing Co., Ltd.) 500m
Irradiation with ultraviolet light of J / cm ² was performed. The subsequent development and electrodeposition steps were performed in the same manner as in Example 1 to obtain a color filter having a 1.9 μm-thick film having a uniform transparent layer having excellent transparency.

[0087]

Example 5 A red photosensitive paint (B-5) was prepared by using a commercially available glass substrate having an ITO film (hereinafter referred to as an original plate 4) as an anode.
Using a stainless steel beaker containing the aqueous solution as a cathode, electrodeposition was performed at a DC voltage of 25 V and a temperature of 25 ° C. for 3 minutes. The master plate 4 was washed with ion-exchanged water and dried at 80 ° C. for 5 minutes to form a 1.8 μm-thick red uniform coating film having no tackiness.

Next, a negative mask having a pattern in which the light transmittance shown in FIG. 3 is different in three stages is closely adhered onto the coating film, and 600 mJ / cm is applied using a UV exposure apparatus in the same manner as in Example 1.
Irradiation of ultraviolet light of ² . Next, when developed with an aqueous solution of sodium carbonate having a concentration of 0.1% by weight, the red photosensitive paint in the portion of the negative mask having the lowest light transmittance was selectively removed, exposing the ITO film. After washing with water and drying, the original plate 4 was used as a cathode, and a stainless steel beaker containing a coloring paint (C-5) was used as an anode and electrodeposited at a DC voltage of 30 V and a temperature of 25 ° C. for 3 minutes. The master plate 4 was washed with ion-exchanged water and dried at 80 ° C. for 5 minutes to form a green colored layer. Then, when developed with an aqueous solution of 0.75% by weight of sodium carbonate, no change was observed in the red and green colored layers, and the black photosensitive paint in the portion having the second lowest light transmittance of the negative mask was selectively used. Was removed. Next, after washing with water and drying, the color paint (C-6) was electrodeposited for 3 minutes at a DC voltage of 30 V and 25 ° C. in the same manner as the electrodeposition of the color paint (C-5). Upon washing with ion-exchanged water, no change was observed in the previously formed red and green colored layers, and a blue colored layer was formed. After drying at 80 ° C. for 5 minutes, a colored layer was obtained. Next, the UV-curable pressure-sensitive adhesive prepared in Synthesis Example 12 was applied to a transparent substrate for transferring the obtained colored layer by a spin coating method.
μm, and irradiating with ultraviolet light of 100 mJ / cm ² , and then pressing the colored layer of the original plate 4 using a rubber roller to transfer the colored layer onto the transparent substrate so as to contact the adhesive. The original plate 4 was peeled off. Then, baking was performed at 130 ° C. for 2 hours for further complete curing. The thickness of each colored layer after curing was 1.8 μm, and a color filter having a uniform colored layer with excellent transparency was obtained.

[Brief description of the drawings]

FIG. 1 is a process chart showing one embodiment of the present invention.

FIG. 2 is an enlarged schematic view of a negative mask used in Examples 1, 2 and 4 of the present invention.

FIG. 3 is an enlarged schematic view of a negative mask used in Examples 3 and 5 of the present invention.

[Explanation of symbols]

 1 light-shielding film equivalent portion (light transmittance 100%) 2 first color equivalent portion (light transmittance 5%) 3 second color equivalent portion (light transmittance 25%) 4 third color equivalent portion (light transmission) 80%) 5 Third color equivalent (light transmittance 100%) 6 First color equivalent (light transmittance 5%) 7 Second color equivalent (light transmittance 25%)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Nakamura 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Japan Inside the Central Research Laboratory of Petroleum Corporation (72) Inventor Hiroshi Otsuki 8 Chidori-cho, Naka-ku, Yokohama-shi, Kanagawa Nippon Oil Corporation Central Research Laboratory (58) Fields investigated (Int. Cl. ⁶ , DB name) G02B 5/20

Claims (1)

(57) [Claims] (A) a step of forming a photosensitive coating film on a substrate having a conductive layer on the surface, and exposing through a negative mask having a pattern having at least three different light transmittances; Coloring is performed by repeating the operation of developing and removing the photosensitive coating on the pattern portion and electrodepositing a colored paint on the exposed conductive layer to form a colored layer for the corresponding pattern portions in order of decreasing light transmittance of the negative mask. A method for producing a color filter, comprising: a step of forming a layer; and (C) a step of transferring the colored layer on a substrate for transferring the colored layer.