JPH0650361B2 - Color filter and method for producing the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color filter used for color separation in a color liquid crystal display device, a color solid-state imaging device, and the like, and a manufacturing method thereof.

[Conventional technology]

As a conventional color filter of this type, a multi-layer type filter is generally known in which a plurality of dye layers of three primary colors are laminated. This multilayer color filter
Generally, it is manufactured by the following steps (a) to (d).

(B) A liquid having a photosensitizer such as ammonium dichromate added to a dye-receptive substance such as gelatin, casein or glue is applied on a substrate to form a dye-receptive layer having photosensitivity, and then this dye-receptive layer Are formed into a predetermined pattern by using the photolithography technique.

(B) The patterned dye receiving layer is dyed with a dye having a predetermined spectral characteristic to form a first dyed layer.

(C) A colorless and transparent dye-proof film which is not dyed with a dye is formed on the entire surface of the first dyeing layer.

(D) By repeating the same steps as (a) to (c) above, the second and third portions are formed on the portion other than the first dyed layer portion.
To form the dyed layer.

However, in such a method for producing a multi-layer color filter, it is necessary to interpose a dye-proof film between each dyed layer, and therefore these dyed layers are located at different levels, which causes parallax shift. However, there is a problem in that it becomes difficult to perform exposure in each layer with high accuracy during patterning of the dye-receiving layer, and the color pattern of the dyed layer tends to become unclear. Further, since the color filter obtained by this manufacturing method has a multilayer structure in which the dyeing layers and the dye-proof film are alternately laminated, it is between the dyeing layer and the dye-proof film or between the dye-proof film and the dye-proof film. There is a problem that adhesion is likely to occur between the film and the reliability is insufficient.

As a solution to the problems associated with such a multi-layer color filter, Japanese Patent Laid-Open No. 59-17512 discloses a color filter having a dye layer with a single-layer structure. The dyed layer of this single-layer type color filter is manufactured by the following steps (a) 'to (d)'.

(B) A resist layer is formed on the surface of the dye receiving layer, and a resist pattern layer having a predetermined pattern is formed by photolithography technique.

(B) 'A dye having a predetermined spectral characteristic contained in the dye bath is absorbed in the dye receiving layer and dyed to obtain a first color pattern in which the dye receiving layer other than the resist pattern layer forming portion is dyed. Form.

(C) 'The resist pattern layer is peeled off from the dye receiving layer.

(D) 'By repeating the same steps as in (a)' to (c) ', second and third color patterns are sequentially formed on the dye receiving layer other than the first color pattern portion.

However, in such a method for producing a single-layer color filter, the adhesive force between the resist pattern layer and the dye receiving layer is reduced by the action of an acid component such as acetic acid contained in the dyeing bath, and therefore the resist pattern layer and It is said that it is difficult to form a clear color pattern with high pattern reproducibility by soaking the dye between the dye receiving layer and dyeing the part other than the intended color pattern part to cause so-called color bleeding. Have a problem. In order to solve such a problem, it is effective to increase the adhesive force between the resist pattern layer and the dye receiving layer by sufficiently performing post-baking at the time of forming the resist pattern layer. This causes a problem that it is difficult to peel off the resist pattern layer and it becomes impossible to form a color pattern in the next stage.

[Problems to be solved by the invention]

A first object of the present invention is to provide a single-layer type color filter having a dyeing layer having a clear pattern with good pattern reproducibility.

A second object of the present invention is to provide a method for manufacturing a color filter which can surely manufacture the color filter by a simple process.

[Means for solving problems]

The first object is a color filter having a color pattern in which a single dyeing layer is dyed with a plurality of dyes having different spectral characteristics, wherein the dyeing layer receives a dye composed of an acid dye to form a color pattern. Of a dye-receptive layer formed by a polymer of a polymerizable monomer having a cationic group and a cross-linked polyvinyl alcohol cross-linked by a cross-linking agent formed on the surface of the dye-receiving layer. And a color filter.

The second object is a method for producing a color filter having a color pattern in which a single dyed layer is dyed with a plurality of dyes having different spectral characteristics, which is formed by a polymer of a polymerizable monomer having a cationic group. On the surface of the dye receiving layer formed, after forming a protective layer consisting of a cross-linked polyvinyl alcohol cross-linked by a cross-linking agent, a plurality of color patterns by repeating the operation including the following steps (a) ~ (c) It is achieved by a method for producing a color filter, which comprises forming a dyed layer having

(a) A step of forming a resist pattern layer on the surface of the protective layer.

(b) A step of forming a color pattern by bringing a dye consisting of an acidic dye having a predetermined spectral characteristic into contact with the dye receiving layer through the protective layer to dye this.

(c) A step of removing the resist pattern layer from the surface of the protective layer.

A particularly characteristic feature of the present invention is that in a single layer type color filter having a color pattern in which a single dyeing layer is dyed separately with a plurality of dyes having different spectral characteristics, or a method for producing the same, a dye-receiving dye On the surface of the layer,
A protective layer formed of a cross-linked polyvinyl alcohol cross-linked with a cross-linking agent is formed, and the dye receiving layer is formed of a polymer of a polymerizable monomer having a cationic group, and an acid dye as a dye. Is used.

With such a configuration, the following operational effects are achieved.

(1) The protective layer made of a cross-linked polyvinyl alcohol has good adhesiveness to both the dye receiving layer and the resist pattern layer made of a polymer of a polymerizable monomer having a cationic group. Even in an acidic dyeing bath with an acidic dye, partial peeling between the resist pattern layer and the protective layer or between the protective layer and the dye receiving layer does not occur. As a result, a dye receiving layer other than the resist pattern layer forming portion is dyed without dyeing the dye receiving layer in the resist pattern layer forming portion, whereby a clear color pattern can be formed.

(2) Since the specific protective layer has a function of protecting the dye receiving layer from mechanical or chemical factors, a highly reliable color filter can be manufactured. For example, since the protective layer suppresses the elution of the dye component in the dye receiving layer, the dye receiving layer is not damaged by washing or other operations.

(3) By forming a specific protective layer on the surface of the dye receiving layer, the resist pattern layer can be easily peeled off.

(4) Since the dye-receiving layer is formed of a polymer of a polymerizable monomer having a cationic group and a dye composed of an acid dye is used, good dyeing can be easily and reliably performed in the dye-receiving layer. Can be achieved.

The color filter obtained by the production method of the present invention is, for example, as shown in FIG. 1, a dye receiving layer 1 on which a plurality of color patterns a, b, c are formed by dyeing, and a surface of the dye receiving layer 1. It is composed of a laminate of the protective layer 2 made of the formed crosslinked polyvinyl alcohol. In addition, a coating film 3 of resin or the like is formed on the surface of the protective layer 2 as needed in order to improve the mechanical strength, shape retention and the like of the color filter.

The film thicknesses of the dye receiving layer 1 and the protective layer 2 are appropriately selected depending on the purpose of use and the like.
It is preferably 1 to 5 μm, 0.1 to 1 μm for the protective layer 2, and 0.5 to 3 μm for the coating film 3 formed as necessary.

Hereinafter, the present invention will be described in detail.

As the dye receiving material for forming the dye receiving layer in the present invention, a polymer having a constitutional unit derived from a polymer of a polymerizable monomer having a cationic group is used. This polymer has the advantage that the quality as a material is constant and that dyeing with an acid dye can be performed under mild conditions.

Specific examples of the polymerizable monomer having a cationic group, which is used in the synthesis of the above-mentioned polymer, include 2-methacryloyloxyethyltrimethylammonium chloride, 2-acryloyloxyethyltrimethylammonium chloride, and 3-methacryloyl. Roxypropyl trimethyl ammonium chloride, 3-acryloyloxy propyl trimethyl ammonium chloride, 2-hydroxy-3-methacryloyloxy propyl trimethyl ammonium chloride, 2-hydroxy-3-acryloyloxy propyl trimethyl ammonium chloride, etc. Derivatives of acid esters; 2-trimethylammonium ethyl acrylamide chloride, 2-trimethyl ammonium ethyl methacrylamide chloride, 3-trimethyl Ammonium propyl acrylamide chloride, trimethyl ammonium propyl methacrylamide chloride, derivatives of 2-triethylammonium ethyl acrylamide Puromido, acrylamide or methacrylamide, such as 2-triethylammonium ethyl methacrylamide methyl sulfonate; and the like. These cationic group-containing monomers may be polymerized alone or may be copolymerized with other polymerizable monomers. The cationic monomer may be used alone or in combination of two or more.

Other polymerizable monomers copolymerizable with the above-mentioned monomer containing a cationic group include methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate and methacrylic acid. 2-ethylhexyl acid, phenyl acrylate, phenyl methacrylate, and other acrylic acid or methacrylic acid esters; styrene, α-methylstyrene, p-methylstyrene,
Vinyl aromatic compounds such as vinyl naphthalene; acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate,
2-hydroxybutyl allylate, methacrylic acid-2
-Functional acrylic compounds such as hydroxybutyl; N-vinylpyrrolidone, N-morpholylacrylamide, acrylonitrile, 4-vinylpyridine, 2-vinylquinoline, acrylamide, methacrylamide, N,
N-dimethylmethacrylamide, N, N-dimethylacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-ethylacrylamide, N-ethylmethacrylamide, N-isopropylacrylamide, N-isopropylmethacrylamide, N-tertial A nitrogen-containing monomer such as butyl acrylamide or N-tert-butyl methacrylamide; These can be used alone or in combination of two or more.

The copolymerization form of the copolymer of the cationic monomer and the other polymerizable monomer is not particularly limited, and may be a random copolymer by addition polymerization, a block copolymer or the like, and the copolymerization method is also Either a solution polymerization method or an emulsion polymerization method may be used.

In the present invention, the dye-receptive layer comprises a radiation crosslinking agent which exerts its function by irradiating the polymer with radiation such as ultraviolet rays and electron beams, for example, a bisazide compound, a dichromate or a thermal crosslinking agent. Can be formed by.

Specific examples of the bisazide compound include, for example, 4 ', 4'-diazidostilbene-2-2'-disulfonic acid, 4,4'-diazidobenzalacetophenone-2-sulfonic acid and 4,4'-disulfonic acid. Azido Stilbene-
Water-soluble bisazide compounds such as α-carboxylic acid and salts thereof such as sodium salt, potassium salt and ammonium salt; p-phenylenebisazide, 4,4′-diazidobenzophenone, 4,4′-diazidostilbene, 4 , 4'-
Oils such as diazidophenylmethane, 4,4'-diazidobenzalacetophenone, 2,6-di- (4'-azidobenzal) cyclohexanone, 2,6-di- (4'-azidobenzal) -4-methylcyclohexanone Soluble bis azide compound; and the like. Of these, water-soluble bisazide compounds are preferable from the viewpoint of compatibility with the above-mentioned polymers.

Specific examples of the thermal crosslinking agent include ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, and 1,6-hexanediol diglycidyl ether. Ether, dibromoneopentyl glycol diglycidyl ether, o-phthalic acid diglycidyl ester, bisphenol S diglycidyl ether, bisphenol A-propylene oxide adduct diglycidyl ether,
Compounds having two or more epoxy groups in one molecule such as o-cresol novolac type epoxy resin, glycerin polyglycidyl ether, trimethylolpropane polyglycidyl ether, diglycerin polyglycidyl ether, polyglycerol polyglycidyl ether and sorbitol polyglycidyl ether. And so on.

The amount of the crosslinking agent used is usually 0.1 to 50 parts by weight with respect to 100 parts by weight of the polymer.

The polymer and the cross-linking agent are usually used in a state of being dissolved in a solvent and mixed. The solvent used at this time is not particularly limited as long as it dissolves the polymer and the cross-linking agent and does not react with them, and various solvents can be used.

Specific examples of the solvent include water; methanol, ethanol, propanol, isopropanol, butanol, isobutanol, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, Alcohol solvents such as diethylene glycol monobutyl ether; acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl isobutyl ketone, methyl-n-butyl ketone, methyl-n-amyl ketone, diethyl ketone,
Ethyl-n-butyl ketone, di-n-propyl ketone,
Ketone solvents such as diisopropyl ketone, cyclohexanone, and holone; ethyl formate, propyl formate, formate-n-butyl acetate, ethyl acetate, acetic acid-n-propyl, acetic acid-n-butyl, acetic acid-
Examples thereof include ester solvents such as n-amyl, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, and diethylene glycol monoethyl ether acetate. Among these, alcohol solvents are preferable from the viewpoint of polymer solubility. These solvents may be used alone or in combination of two or more.

The coating composition for forming the dye-receptive layer of the present invention contains a dye-receptive substance and, if necessary, a crosslinking agent and an additive (for example, an antiaging agent, a sensitizer, a silane coupling agent, etc.) suitable. It is composed by dissolving in a solvent. The concentration of the coating composition is not particularly limited and may be appropriately selected depending on the purpose of use, but it is generally 3 to 50% by weight in terms of solid content concentration. Further, as a method for applying the coating composition thus prepared onto a substrate, various application methods such as a dipping method, a spray method, a roll coating method, a curtain coating method and a spin coating method can be used. It is also possible to use a coating method such as printing.

The dye-receptive layer in the present invention is obtained by coating the coated structure on the substrate as described above, then drying and crosslinking. Here, the crosslinking is carried out by irradiating with radiation when a radiation crosslinking agent is used, and by heating to 50 to 200 ° C. when a thermal crosslinking agent is used.

The polyvinyl alcohol used to form the protective layer in the present invention is not particularly limited, but those having a saponification rate of 50 to 100%, preferably 80 to 100% can be suitably used. The saponification rate of polyvinyl alcohol is 50
When it is less than%, the dyeing property of the dye receiving layer becomes slightly inferior. The number average molecular weight of polyvinyl alcohol is usually 5,000 to 500,000, preferably 10,000 to 200,00.
Those of 0 can be preferably used. When the number average molecular weight of polyvinyl alcohol is less than 5,000,
The sensitivity at the time of radiation crosslinking described below is insufficient, and when the number average molecular weight of polyvinyl alcohol is larger than 500,000, the storage stability of the solution may be deteriorated.

The polyvinyl alcohol is usually used in the state of an aqueous solution, the concentration is not particularly limited, preferably 0.
It is 1 to 30% by weight. Further, a cross-linking agent is added to the polyvinyl alcohol in order to make the polyvinyl alcohol into a cross-linked product. A radiation crosslinking agent, a thermal crosslinking agent, etc. can be used as such a crosslinking agent. Specific examples of the radiation crosslinking agent include the bisazide compound and dichromate. Examples of the thermal crosslinking agent include organic carboxylic acids such as acetic acid, benzoic acid, phthalic acid, terephthalic acid, trimellitic acid, and pyromellitic acid, and polycarboxylic acid anhydrides such as phthalic anhydride and pyromellitic dianhydride. You can The amount of the crosslinking agent used is preferably 0.1 to 50 parts by weight per 100 parts by weight of polyvinyl alcohol. When the amount of the cross-linking agent used is less than 0.1 part by weight, the cross-linking is insufficient and the polymer after cross-linking is not sufficiently insolubilized in the dye bath. If the amount of the cross-linking agent used is more than 50 parts by weight, the storage stability of the solution will be poor.

The coating method of the polyvinyl alcohol solution is not particularly limited, and a printing method such as a dipping method, a spray method, a roll coating method, a curtain coating method, a spin coating method, or a screen printing can be used.

The protective layer in the present invention can be obtained by applying the polyvinyl alcohol solution on the dye-receiving layer, then drying and crosslinking, and the crosslinking method is the same as that for the dye-receiving layer.

The type of resist used to form the resist layer in the present invention is not particularly limited, a negative resist obtained by adding a bisazide compound to a cyclized rubber such as a polyisoprene cyclized product, and a naphthoquinonediazide compound added to a novolak resin. A positive resist or the like can be used. The method of applying these resists is not particularly limited, and the methods described above can be used, and usually the film thickness after drying is 0.
Apply so that the thickness is 5 to 2 μm. The patterning of the resist layer is achieved by irradiating with radiation such as ultraviolet rays through a pattern mask, followed by development, rinsing treatment if necessary, and drying.

In the present invention, an acid dye is used as the dye for dyeing the dye receiving layer. Examples of the acid dyes used as the three primary colors of red, green and blue include the following commercial products (trade name and manufacturer name).

Red dyes include Suminol Milling Scarlet G (Sumitomo Chemical), Cibacron Scarlet G-
P (Ciba Kaiggy), Cibacron Bronte Scarlet (Ciba Geigy), Suminol Fast Red G (Sumitomo Chemical), Sumilite Supra Red 4BL (Sumitomo Chemical), Aminyl Red E- 2B
L (Sumitomo Chemical), Aminyl Red E-3BL (Sumitomo Chemical), Azido Scarlet 901 (Sumitomo Chemical), Suminol Milling Scarlet FG (Sumitomo Chemical), Suminol Milling Orange SG (Sumitomo Chemical) ), Suminol Fast Orange PO (Sumitomo Chemical), Maxilon Red GRL (Ciba Geigy), Eriocin Scarlet RE (Ciba Geigy), Mikawan Brilliant Red 8BS (Mitsubishi Chemical), Acid Light Scarlet GL 130%
(Mitsubishi Chemical), Kayanol Milling Red RS125
(Nippon Kayaku), Kayanol Milling Red 3BW
(Nippon Kayaku) and the like can be mentioned.

As green dyes, Suminol Milling Brilliant Green 5G (Sumitomo Chemical), Acid Brilliant Milling Green G (Sumitomo Chemical), Acid Brilliant Milling Green B (Sumitomo Chemical), Mycation Olive -Green-3GS (Ciba-Geigy), Kayanol Milling Green-5GW (Nippon Kayaku), Sooriidazol Green-P-GG (Hoechst), Paper Fast Green-5G (Bayer), etc. be able to.

Blue dyes include Sumilite, Supra, Turquoise,
Blue G (Sumitomo Chemical), Cibacron Blue 3G-
A (Ciba Geigy), Kayachi on Turquoise
PA (Nippon Kayaku), Kayathion Turquoise P-NG
F (Nippon Kayaku), Sumikaron Blue E-FBL (Sumitomo Chemical), Sumikaron Brilliant Blue S-BL
(Sumitomo Chemical), Suminol Leveling Sky Blue R. Extra Conc (Sumitomo Chemical), Kayanol Milling Blue GW (Nippon Kayaku), and the like.

In this way, by using an acid dye as the dye,
Since the dye receiving layer to be dyed is formed by the polymer of the polymerizable monomer having a cationic group as described above, good dyeing can be easily and surely achieved in the dye receiving layer. be able to. This is because the acid dye has a large ionic affinity with the dyeing site of the cationic group in the dye receiving layer, so that a large amount of dye molecules are stably bound to the dyeing site of the dye receiving layer.

The dye receiving layer is dyed by immersing the layer to be dyed in an aqueous solution of 0.1 to 5% by weight of the acid dye for about 1 to 30 minutes, so that the equilibrium dyeing amount can be reached. .

Further, the peeling of the resist pattern layer after dyeing of the dye receiving layer is carried out by immersing in a usual resist stripping solution containing a surfactant and an oxidizing agent in the case of a negative type resist, and in the case of a positive type resist. Can be performed by irradiating the resist pattern layer with radiation and then immersing the resist pattern layer again in a solution used as a developing solution for the resist.

〔Example〕

Examples of the present invention will be described below, but the present invention is not limited thereto.

Example 1 Vinylpyrrolidone (68 parts by weight) and 2-methacryloyloxyethyltrimethylammonium chloride (14 parts by weight)
And methyl methacrylate (18 parts by weight) copolymer (intrinsic viscosity in 0.1% by weight sodium chloride aqueous solution: 1.1 dl
/ G) was dissolved in 90 g of methyl cellosolve. To the resulting solution was added 0.44 g of sodium 4,4'-diazidostilbene-2,2'-disulfonate, and the mixture was stirred and uniformly mixed. The solution was filtered with a filter having a pore size of 0.2 µm to obtain a dye receiving substance. The coating composition of was prepared.

A solution containing polyglycidyl methacrylate (polystyrene-equivalent weight average molecular weight by gel permeation chromatography: 65,000) as a main component was applied onto a glass substrate and dried, and then the above coating composition was rotated at a rotation speed of 3,000.
r. p. m. Was spin coated at. The dried film thickness of the coating film was measured by a stylus type film thickness meter “Alphastep” (manufactured by Tencor Co.), and it was 0.9 μm. The entire surface of the coating film thus obtained was irradiated with ultraviolet rays to cross-link the coating film made of the dye receiving substance to form a paint receiving layer.

Next, a coating solution prepared by filtering a solution of 10 g of polyvinyl alcohol (polymerization degree: 500, saponification rate: 100%) and 0.5 g of ammonium dichromate in 90 g of water on the dye receiving layer through a 0.2 μm filter. At a rotation speed of 3,000 r. p.
m. Was spin coated at. After drying this for 10 minutes at 110 ℃, the entire surface of the coating film is irradiated with ultraviolet rays to be photocured, and the film thickness is reduced to 0.
A protective layer of 5 μm was formed.

A positive resist "PFR-3003" (manufactured by Nippon Synthetic Rubber Co., Ltd.) was rotated on the laminated body composed of the two layers of the dye receiving layer and the protective layer thus obtained at a rotation speed of 3,000 rpm. p. m. Was spin coated at. After that, it is dried at 80 ° C for 10 minutes and irradiated with ultraviolet light through a photomask having a desired pattern,
This was developed with a developing solution "PD524" (manufactured by Japan Synthetic Rubber Co., Ltd.) to pattern the resist to form a resist pattern layer, thereby preparing a dyeing substrate. The obtained dyeing substrate was placed in a dyeing bath consisting of 1 g of Kayanol Milling Red RS125 and 100 g of water.
The dye receiving layer was dyed by immersing it at 5 ° C. for 5 minutes. After that, the entire surface of the substrate was irradiated with ultraviolet rays, the resist layer was removed with the above-mentioned developing solution, followed by washing with water and drying to form a first color pattern on the dye receiving layer.

Then, the procedure of forming a resist pattern layer-dyeing-removing the resist pattern layer was repeated in the same manner as described above to form a second color pattern and a third color pattern to form a dye layer.

Further, a solution containing polyglycidyl methacrylate (polystyrene-equivalent weight average molecular weight 65,000) as a main component was applied onto the protective layer and dried to form a 2 μm-thick film to obtain a color filter. This color filter was excellent without any color blur in each color pattern.

Example 2 Except that in the preparation of the coating liquid containing polyvinyl alcohol in Example 1, 4,4′-diazidostilbene 2,2′-sodium disulfonate (0.5 g) was used instead of ammonium dichromate. A color filter was obtained in the same manner as in Example 1. This color filter was excellent with no color blur in each color pattern.

Example 3 A color filter was obtained in the same manner as in Example 1 except that a glass substrate with indium tin oxide (ITO) was used instead of the glass substrate in Example 1. This color filter was excellent without any color blur in each color pattern.

Comparative Example 1 Each of the steps of forming a dye receiving layer-forming a resist pattern layer-staining-removing the resist pattern layer in the same manner as in Example 1 except that the protective layer made of the crosslinked polyvinyl alcohol in Example 1 was not formed. The operation was performed to obtain a color filter. This color filter was not clear with low pattern reproducibility because of significant color fringing in the color pattern.

Comparative Example 2 In the formation of the protective layer in Example 1, the protective layer was formed using a simple aqueous solution of polyvinyl alcohol to which ammonium dichromate as a cross-linking agent was not added.
Similarly, apply a positive resist on the protective layer,
When the patterning was carried out, the protective layer swelled violently due to the development treatment, so that a defect was generated in a part of the pattern.

Further, the dye receiving layer was dyed in the same manner as in Example 1 to form a first color pattern, and then the resist pattern layer was peeled and removed. As a result, peeling of the protective layer occurred and color fringing occurred. The formation of the second color pattern was stopped because the so-called bleeding of the dye, which was the cause, occurred.

〔The invention's effect〕

According to the present invention, it is possible to provide a single-layer type color filter having a dyed layer having a clear pattern with good pattern reproducibility. Further, according to the manufacturing method of the present invention,
It is possible to provide a method for manufacturing a color filter that can reliably manufacture the color filter by a simple process.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the color filter of the present invention. 1 ... Dye receiving layer having a plurality of color patterns formed by dyeing a, b, c ... Color pattern 2 ... Protective layer 3 ... Coating

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Matsumoto 2-11-24 Tsukiji, Chuo-ku, Tokyo Japan Synthetic Rubber Co., Ltd. (56) Reference JP-A-58-126507 (JP, A) Kaisho 59-193423 (JP, A)

Claims (2)

[Claims] 1. A color filter having a color pattern in which a single dyeing layer is dyed separately with a plurality of dyes having different spectral characteristics, wherein the dyeing layer has a color pattern formed by receiving a dye consisting of an acid dye. A dye-receptive layer formed of a polymer of a polymerizable monomer having a cationic group, and a protective layer formed on the surface of the dye-receptive layer and comprising a crosslinked polyvinyl alcohol crosslinked with a crosslinking agent. A color filter characterized by being composed of 2. A method for producing a color filter having a color pattern in which a single dyed layer is dyed with a plurality of dyes having different spectral characteristics, and is formed of a polymer of a polymerizable monomer having a cationic group. On the surface of the dye-receiving layer, after forming a protective layer made of a cross-linked polyvinyl alcohol cross-linked with a cross-linking agent, it has a plurality of color patterns by repeating the operation including the following steps (a) ~ (c) A method for producing a color filter, which comprises forming a dyed layer. (a) A step of forming a resist pattern layer on the surface of the protective layer. (b) A step of forming a color pattern by bringing a dye consisting of an acidic dye having a predetermined spectral characteristic into contact with the dye receiving layer through the protective layer to dye this. (c) A step of removing the resist pattern layer from the surface of the protective layer.