JP3996674B2 - Black photosensitive resin composition, color filter using the same, and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a black photosensitive resin composition, a color filter using the same, and a method for manufacturing the same, and more particularly to a material for manufacturing a color filter used for a liquid crystal display or the like. The present invention relates to a black photosensitive resin composition used for formation and a method for forming a black matrix.
[0002]
[Prior art]
Conventionally, color filters have been widely used in the field of liquid crystal display devices. This color filter is usually a multi-color pixel of red, green, blue, etc. arranged on a transparent substrate. Further, in order to obtain an image with good contrast, a black black matrix is formed between these pixels. Furthermore, it is also used for the purpose of preventing malfunction of a transistor used for a TFT drive type liquid crystal display.
[0003]
The black matrix is usually formed as a metal thin film having a fine pattern on a glass transparent substrate. As a specific example, there is a method in which a thin film is formed by a vacuum film formation method such as a vapor deposition method or a sputtering method using a metal or a metal compound such as chromium, nickel, or aluminum, and a fine pattern is formed by photolithography. It is common.
[0004]
Specifically, a resist pattern is formed by applying and drying a photoresist on a thin film of metal or the like, irradiating with ultraviolet rays through a photomask, and developing. Thereafter, a black matrix is formed through an etching process and a resist stripping process. However, the black matrix manufactured in the above process has a problem that the manufacturing cost is very high due to the complexity of the process, and the cost of the color filter using the black matrix increases.
[0005]
When a color filter using this metal thin film is mounted on a transmissive liquid crystal display, the reflectance of the metal surface generally used as the metal thin film is high, and strong external light is incident on the color filter. In the case of a chromium thin film, there is a problem that the reflected light is strong and the display quality is remarkably lowered.
[0006]
On the other hand, various methods for improving the problems of the black matrix using the metal thin film as described above have been studied. For example, a method has been proposed in which carbon black and, if necessary, an organic pigment are dispersed in a photosensitive resin composition, and a black matrix is formed using this. However, in order to obtain a sufficient light-shielding property with carbon black, a film thickness of about 1 μm is required. For this reason, an overlapping portion with a plurality of color pixels, which is a margin for alignment, becomes a protrusion in a shape, which causes display unevenness.
[0007]
In JP-A-6-59119, a black photosensitive resin layer is provided on a plurality of color pixels and between a plurality of color pixels, and then the entire surface is exposed from the transparent substrate side using the plurality of color pixels as a mask. Methods and materials for selectively providing a black black matrix only in the gaps between color pixels have been proposed.
[0008]
When this so-called back exposure method is used, there is no protrusion in the shape of one. However, in order to take a sufficient thickness of the black black matrix and no black layer remains on the multi-color pixels, the black light-sensitive resin composition of the multi-color pixels has a sufficiently high light shielding property in the photosensitive wavelength region. I had to. Therefore, it has been necessary to add ultraviolet absorbers such as titanium oxide, zinc oxide, benzotriazole compounds, and coumarin compounds to the multiple color pixels that serve as a mask.
[0009]
For this reason, there has been a problem that optical characteristics as a color filter of a plurality of color pixels, that is, transparency and contrast ratio are remarkably impaired.
On the other hand, in the photopolymerization type photosensitive resin, the photosensitive characteristic curve is comparatively gentle and the γ value is small. Therefore, in order to obtain a sufficient film thickness, a sufficiently large exposure amount is necessary. It was necessary for the light shielding property to be sufficiently high.
[0010]
Furthermore, since carbon black has the property of capturing radicals generated from the photopolymerization initiator used in the photopolymerization type photosensitive resin by ultraviolet irradiation, it inhibits photopolymerization and is sufficient for economical exposure. There are problems such as difficulty in pixel formation and peeling of the pattern during development.
[0011]
JP-A-4-177202 discloses a black matrix material comprising a photoacid generator, a crosslinking agent, a binder polymer having a crosslinking point, and a black pigment. However, the specification of this patent does not describe a method for performing exposure from the transparent substrate side. In addition, when an ungrafted black pigment is applied to the back exposure method, the film strength, dispersion stability and storage stability are obtained when the optical density (OD value) at a formed film thickness of 1 μm is 2.0 or less. It is possible to obtain However, when trying to obtain an optical density of 2.0 or more at a formed film thickness of 1 μm, the film strength is very weak near the surface of the formed black matrix because there are few resin components, and the meltability by heating is also insufficient. There is a problem that the sensitivity is low and the dispersion stability and storage stability of the resist itself cannot be obtained.
[0012]
[Problems to be solved by the invention]
The present invention has been made to solve such a problem, and the problem is that a black matrix having an optical density sufficient to block light and having a low reflectance can be formed. Another object of the present invention is to provide a black photosensitive resin composition capable of producing a color filter having high sensitivity, high flatness and high film strength, a color filter using the same, and a method for producing the same.
[0013]
[Means for Solving the Problems]
As a result of diligent research on such problems, the present inventors have found that the problem can be solved by using a specific black photosensitive resin composition for forming a black matrix, and the present invention has been accomplished.
[0014]
The invention of claim 1 of the present invention is a black photosensitive resin composition comprising carbon black grafted with a polymer compound, a resin-based material, a crosslinking agent and a photoacid generator, on a non-volatile solid basis, The carbon black grafted when the black photosensitive resin composition is 100 parts by weight is 35 to 93.6 parts by weight, and the resin material when the black photosensitive resin composition is 100 parts by weight. Is 1 to 35 parts by weight, the crosslinking agent is 0.4 to 15 parts by weight, and the photoacid generator is 5 to 15 parts by weight.
[0015]
The invention of claim 2 of the present invention is the black photosensitive resin composition according to claim 1, wherein the polymer compound is an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, an isocyanate group, It has one or two or more groups selected from a vinyl group, an acrylic group, a methacryl group, a silicon hydrolyzable group and an amino group in the molecule.
[0016]
The invention of claim 3 of the present invention is the black photosensitive resin composition according to claim 1, wherein the carbon black has a pH of 7 or less, and the ratio of the polymer compound to carbon black is carbon black. When it is 100 parts by weight, it is 5 to 100 parts by weight .
[0017]
According to a fourth aspect of the present invention, in the black photosensitive resin composition according to the first aspect, the resin material is a polymer that contains an OH group that can be a crosslinking point and is soluble in an alkaline aqueous solution. Features.
[0018]
The invention of claim 5 of the present invention is a color filter, wherein a whatever child black matrix and a plurality of colors of pixels consisting of claims 1 to 4 black photosensitive resin composition.
[0019]
The invention according to claim 6 of the present invention is the method for producing a color filter according to claim 5, comprising at least the following steps (1) to (5).
(1) providing a plurality of color pixels on a transparent substrate;
(2) The process of providing the black photosensitive resin composition of Claims 1-4 between the multiple color pixels formed on the transparent substrate and on the multiple color pixels,
(3) A step of generating an acid only in the black photosensitive resin composition layer between a plurality of color pixels by exposure from the transparent substrate side,
(4) a step of Ru only black photosensitive resin composition layer between the heating the transparent substrate after the exposure a plurality of colors of pixels to cause a crosslinking reaction,
(5) A step of dissolving and removing the unexposed black photosensitive resin composition on the plurality of color pixels from the heated transparent substrate.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described.
In the present invention, as the black photosensitive resin composition to be a black matrix that is a black matrix, a black photosensitive resin composition comprising a polymer-grafted carbon black, a resin-based material, a crosslinking agent, and a photoacid generator. Is used.
[0021]
As a technique for grafting a polymer compound to carbon black, a technique as described in Carbon Black Handbook (Third Edition) (published by the Carbon Black Association), pages 167 to 173, ie, (1) in the presence of carbon black (2) A method for capturing a polymer chain on a carbon black particle surface by polymerizing a vinyl monomer, (2) A method for growing a graft chain from a polymerization initiating group introduced on the carbon black surface, (3) A functional group on the carbon black surface In the present invention, any method may be used.
From the viewpoint of graft efficiency, it is preferable to use the method (3). Furthermore, a reactive polymer, that is, a polymer compound referred to in the present invention, an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, an isocyanate. Most preferred are those having a group, vinyl group, acrylic group, methacryl group, silicon hydrolyzable group, or amino group. The polymer compound needs to have one or more of these groups in the molecule.
[0022]
In particular, in terms of reactivity with the functional group on the surface of carbon black, it has one or more groups selected from an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, and an isocyanate group. It is a polymer compound.
[0023]
When carbon black and a polymer compound are reacted, substances such as a polymer component, a monomer, and an organic solvent other than the polymer compound may be present in the reaction system as long as the reaction is not inhibited. The polymer compound needs to be contained in an amount of 5 to 100 parts by weight, preferably 20 to 60 parts by weight, based on 100 parts by weight of carbon black. If the amount is less than 5 parts by weight, the effect of grafting, that is, the film strength is not improved, and if it exceeds 100 parts by weight, the photosensitivity is impaired or the optical density is insufficient.
[0024]
The carbon black used in the present invention is not particularly limited as long as it has a functional group such as a carboxyl group or a hydroxyl group on its surface. For example, any type of carbon black such as furnace black, channel black, acetylene black, and lamp black can be used. Although normal commercial products can be used, the pH of carbon black is 7 or less, preferably 5 or less. When the pH exceeds 7, the effect of grafting, that is, the improvement of the thin film strength is not recognized. The average particle size of carbon black is preferably in the range of 0.0005 to 0.5 μm, particularly 0.001 to 0.2 μm. Those having an average particle diameter of less than 0.0005 μm are not easily obtained. When the average particle diameter exceeds 0.5 μm, there is a possibility that sufficient dispersibility cannot be imparted to the obtained carbon black graft polymer.
These grafted carbon blacks are used in the range of 35 to 93.6 parts by weight with respect to 100 parts by weight of the black photosensitive resin composition. If the amount is less than 35 parts by weight, sufficient translucency cannot be obtained, and if it is more than 93.6 parts by weight, the photosensitive characteristics are hindered.
In addition, pH of carbon black is measured according to JIS-K6221 (carbon black test method for rubber | gum).
[0025]
As the resin material used in the present invention, a polymer compound containing an OH group that can be a crosslinking point and soluble in an alkaline aqueous solution is preferably applied. Examples of the resin material include phenol norvolak, phenols represented by p-hydroxystyrene, OH groups such as 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, acrylic acid, methacrylic acid, maleic acid, and fumaric acid. A homopolymer or copolymer of a monomer containing is used.
[0026]
Other monomers that can be used for copolymerization include styrene, phenylmaleimide, methyl acrylate, ethyl acrylate, butyl acrylate, benzyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, benzyl methacrylate, and the like. It is done.
[0027]
These resin materials are used in the range of 1 to 35 parts by weight when the black photosensitive resin composition is 100 parts by weight. If the amount is less than 1 part by weight, the photosensitive function deteriorates, the pattern shape deteriorates due to carbon aggregation, and the film strength and adhesion are insufficient. If the amount exceeds 35 parts by weight, Insufficient light shielding.
[0028]
As the crosslinking agent used in the present invention, methylolated urea, urea resin, methylolated melamine, butyrolated melamine, methylolated guanamine, or alkyl ethers of these compounds can be used. From the viewpoint of excellent thermal stability, alkyl etherified products are more preferable. The alkyl group of this alkyl ether is preferably an alkyl group having 1 to 5 carbon atoms.
In particular, the alkyl ether compound is preferably an alkyl etherified product of hexamethylol melamine which is excellent in sensitivity. A compound having two or more epoxy groups can also be used.
These crosslinking agents are used within a range of 0.4 to 15 parts by weight when the black photosensitive resin composition is taken as 100 parts by weight. If the amount is less than 0.4 parts by weight, the photosensitive properties are impaired. If the amount is more than 15 parts by weight, the light shielding property is insufficient.
[0029]
As the photoacid generator used in the present invention, trihalomethyl group-containing triazine derivatives or onium salts that absorb in the wavelength range included in the light emission of the light source and generate an acid by light absorption can be used.
For example, the trihalomethyl group-containing triazine derivatives include 2,4,6-tris (trichloromethyl) -s-triazine, 2- (p-methoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxyphenyl) 4,6-bis (trichloromethyl) -s-triazine, 2- (p-chlorophenyl) -4, 6-bis (trichloromethyl) -s-triazine, 2- (4′-methoxy-1′-naphthyl) -4,6-bis (trichloromethyl) s-triazine, 2- (p-methylthiophenyl) -4, Examples thereof include 6-bis (trichloromethyl) -s-triazine.
[0030]
Other onium salts include diphenyliodonium tetrafluoroborate, diphenyliodonium hexafluorophosphonate, diphenyliodonium hexafluoroarsenate, diphenyliodonium trifluoromethanesulfonate, diphenyliodonium trifluoroacetate, diphenyliodonium-p-toluenesulfonate, 4-methoxy Phenylphenyliodonium tetrafluoroborate, 4-methoxyphenylphenyliodonium hexafluorophosphonate, 4-methoxyphenylphenyliodonium hexafluoroarsenate, 4-methoxyphenylphenyliodonium trifluoromethanesulfonate, 4-methoxyphenylphenyliodonium trifluoroacetate, 4 −Me Xiphenyliodonium-p-toluenesulfonate, bis (4-tert-butylphenyl) iodonium tetrafluoroborate, bis (4-tert-butylphenyl) iodonium hexafluorophosphonate, bis (4-tert-butylphenyl) iodonium hexafluoro Arsenate, bis (4-tert-butylphenyl) iodonium trifluoromethanesulfonate, bis (4-tert-butylphenyl) iodonium trifluoroacetate, bis (4-tert-butylphenyl) iodonium-p-toluenesulfonate, etc. Diaryliodonium salts,
Triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluorophosphonate, triphenylsulfonium hexafluoroarsenate, triphenylsulfonium trifluoromethanesulfonate, triphenylsulfonium trifluoroacetate, triphenylsulfonium-p-toluenesulfonate, 4-methoxy Phenyldiphenylsulfonium tetrafluoroborate, 4-methoxyphenyldiphenylsulfonium hexafluorophosphonate, 4-methoxyphenyldiphenylsulfonium hexafluoroarsenate, 4-methoxyphenyldiphenylsulfonium trifluoromethanesulfonate, 4-methoxyphenyldiphenylsulfonium trifluoroacetate, 4 -Methoxy Phenyldiphenylsulfonium-p-toluenesulfonate, 4-phenylthiophenyldiphenyltetrafluoroborate, 4-phenylthiophenyldiphenylhexafluorophosphonate, 4-phenylthiophenyldiphenylhexafluoroarsenate, 4-phenylthiophenyldiphenyltrifluoromethanesulfone And triarylsulfonium salts such as 4-phenylthiophenyldiphenyltrifluoroacetate and 4-phenylthiophenyldiphenyl-p-toluenesulfonate.
[0031]
These photoacid generators may be used alone or in combination. For example, a combination of a light absorber and an acid generator can be used. The addition amount is used in the range of 5 to 15 parts by weight when the black photosensitive resin composition is 100 parts by weight. When added in an amount exceeding 15 parts by weight, the amount of acid generated is too large, and the acid diffuses in the unexposed part due to heating after pattern exposure to cause a crosslinking reaction, resulting in a decrease in resolution. When the addition amount is less than 5 parts by weight, the acid generation amount is poor, the crosslinking reaction does not proceed sufficiently, and a pattern cannot be formed.
[0032]
These materials are kneaded using a disperser such as a two-roll mill, a three-roll mill, a sand mill, or a paint conditioner to obtain a black photosensitive resin composition.
Further, as a diluent solvent for improving workability during dispersion, ethyl cellosolve, ethyl cellosolve acetate, butyl cellosolve, butyl cellosolve acetate, ethyl carbitol, ethyl carbitol acetate, diethylene glycol, cyclohexanone, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, Organic solvents such as lactic acid esters may be used.
[0033]
Hereinafter, an example of the process of the manufacturing method of the color filter of this invention is demonstrated based on drawing.
A plurality of color pixels 2 are provided on a transparent substrate 1, and the black photosensitive resin composition 3 of the present invention is applied on the plurality of color pixels 2 and between the plurality of color pixels 2 by a Svinner method, a bar coating method, a roll coating method, a curtain coating method. Etc. to uniformly apply as shown in FIG. 2 to form a black resin layer.
[0034]
As a method for forming a multi-color pixel, any of the currently practical methods such as a dyeing method, a pigment dispersion method, a printing method, and an electrodeposition method, which are conventional techniques, may be used. When the substrate is brought into close contact, heat of about 70 ° C. to 100 ° C. may be applied.
[0035]
Next, exposure is performed by irradiating ultraviolet rays having a wavelength of 400 nm or less, more preferably in the range of 250 to 400 nm, from the back surface of the transparent substrate to generate an acid only in the black resin layer in the multicolor pixel gap portion. As a light source used for exposure, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like is used. When the photosensitive wavelength region of the black photosensitive composition extends to 400 nm or more, it is preferable to expose through a visible light cut filter.
[0036]
Next, a cross-linking reaction is caused to occur only in a plurality of color pixel gaps of the black photosensitive resin layer using an acid catalytic reaction at a heating temperature of 90 ° C. to 150 ° C. for 15 seconds to 5 minutes.
[0037]
Next, the black resin at the uncrosslinked portion on the multi-color pixels is removed using a developer to obtain a color filter with high flatness as shown in FIG. Developers include inorganic alkaline solutions such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, alkylamines such as triethylamine, alcohol amines such as triethanolamine, and quaternary compounds such as tetramethylammonium hydroxide. An ammonium salt or the like can be used.
[0038]
As described above, in the present invention, a highly sensitive black photosensitive resin composition can be obtained by using a resin material, a crosslinking agent, and a photoacid generator. In addition, by using the grafted carbon black material, only the polymer is eluted at the time of development, and an effect that peeling due to cohesive failure does not occur. In addition, by using a photosensitive resin composition that crosslinks using an acid generated from a photoacid generator, the slope of the sensitivity characteristic curve increases, and the residual film ratio after development suddenly in a region of a certain exposure amount or more Therefore, the photosensitive resin composition does not remain on the multi-color pixels, and an effect of obtaining a predetermined film thickness on the transparent substrate appears.
[0039]
In addition, by forming a black matrix that is a black matrix using the back exposure method, an effect of eliminating the overlap of the multi-color pixels and the black matrix is exhibited. All these actions eliminate the need to cure the interior of the black photosensitive resin layer with a large amount of ultraviolet light as in the conventional exposure method from the back side of the transparent substrate. Regardless of the optical density, it is possible to form a color filter in which a plurality of color pixels and a black matrix do not overlap by exposure with a small amount of ultraviolet light from the back side of the transparent substrate.
[0040]
【Example】
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited by these.
[Synthesis Example of Carbon Black Graft Polymer (GCB) Dispersion Containing Carboxyl Group]
(Process 1)
A separable flask equipped with a stirring blade, an inert gas introduction tube, a reflux condenser, a thermometer, and a dropping funnel was charged with 80 parts of toluene and 20 parts of methyl ethyl ketone, and 85 parts of methyl methacrylate (MMA). Polymerization was carried out by continuously dropping a mixed solution of 15 parts of 2-hydroxyethyl methacrylate (HEMA), 4.3 parts of thioglycolic acid, and 2 parts of azobisisobutyronitrile (AIBN) over 4 hours.
Thereafter, the mixture was heated at the same temperature for 3 hours, and then aged at 95 ° C. for 2 hours to complete the polymerization. 8.5 parts (1.3 equivalents / COOH) of glycidyl methacrylate (GMA) with respect to 200 parts of the reaction solution, 1.3 parts of tetrabutylammonium bromide as a catalyst, and 0.04 part of hydroquinone monomethyl ether as a polymerization inhibitor And reacted at a reaction temperature of 85 to 90 ° C. for 10 hours. This was reprecipitated in n-hexane and then dried under reduced pressure at 50 ° C. for 2 days to obtain a one-end methacrylate type MMA-HEMA copolymer macromonomer.
[0041]
(Process 2)
50 parts of the macromonomer obtained in Step 1, 25 parts of styrene (St), 20 parts of HEMA, 5 parts of isopropenyl oxazoline (IPO), 3 parts of AIBN as an initiator, and propylene glycol monomethyl ether acetate (PGM-Ac) 100 as a solvent A polymerizable monomer composition was obtained by dissolving in a part.
The same separable flask used in step 1 was charged with 50 parts of PGM-Ac and heated to 80 ° C. The above polymerizable monomer composition was charged into a dropping funnel and dropped at a temperature of 80 ° C. for 3 hours, and then the polymerization reaction was continued for 2 hours at the same temperature. Thereafter, the temperature was raised to 110 ° C. and a aging reaction was performed for 2 hours to obtain a solution of a polymer compound having an oxazoline group as a reactive group (nonvolatile content: 40%).
[0042]
(Process 3)
In a separable flask equipped with a stirring blade, a cooling tube, and a temperature sensor, 30 parts of carbon black, 22.5 parts of the polymer compound solution obtained in Step 2, 97.5 parts of PGM-Ac, and zirconia beads 800 Prepared the department. The reaction was conducted at 100 ° C. for 3 hours while stirring at a rotational speed of 600 rpm. After cooling, separation from the beads was performed to obtain a carbon black graft polymer (GCB) dispersion having a carbon black content of 20%.
[0043]
(Process 4)
With respect to 150 parts of the GCB dispersion obtained in Step 3, 3.59 parts of trimellitic anhydride (MW 192.13) and 1,8-diazabicyclo [5,4,0] -undecene (DBU) 0. 09 parts was added, and the reaction was carried out at 80 ° C. for 1 hour to obtain a GCB dispersion containing a carboxyl group.
[0044]
[Formation of multiple color pixels]
As a transparent substrate, Corning: “7059” was used as a transparent substrate, and on this, a color pattern of RGB was formed by a conventional method using “Color Mosaic CRY7000, CGY7000, CBV7000” manufactured by Resist Fuji Hunt. The film thickness of these multiple color pixels was 1.5 μm.
[0045]
[Formation of black photosensitive resin layer]
300 parts of the GCB dispersion obtained in Step 4, 12 parts of polyhydroxystyrene (MW5000) as a resin-based material, 5 parts of “Nikkalac MW-30M” manufactured by Sanwa Chemical Co., Ltd. as a crosslinking agent, and a photoacid generator 5 parts of “TAZ-104” manufactured by Midori Kagaku Co., 172 parts of PGM-Ac as a solvent, and 500 g of glass beads were placed in a glass bottle and dispersed for 2 hours with a paint shaker to prepare a black photosensitive resin dispersion. This black photosensitive resin dispersion was applied onto the RGB colored pattern obtained by forming a plurality of color pixels with a spinner at 760 rpm for 5 seconds and dried to form a black resin layer as shown in FIG.
[0046]
[exposure]
The entire surface was exposed from the transparent substrate side using the multi-color pixel as a mask at an exposure amount of 160 mJ / cm ^{2 with} a 3 kW ultra-high pressure mercury lamp.
[0047]
[heating]
Then, it heated at 90 degreeC for 1 minute using the hotplate.
[0048]
[developing]
Using a 25% aqueous sodium hydroxide solution, development was performed for 30 seconds by spraying a shower while rotating the transparent substrate to remove the unexposed black photosensitive resin layer on the RGB colored pattern. Finally, it was heated in an oven at 230 ° C. for 1 hour to obtain a color filter.
[0049]
【The invention's effect】
As described above, since the black photosensitive resin composition used for the black matrix of the present invention itself is a highly sensitive resist, the black matrix can be formed with a practical level of exposure.
Since the black photosensitive resin composition has a high γ value, a sufficient residual film can be obtained with an exposure amount that does not cause fogging on a plurality of color pixels. At that time, it is not necessary to add an additive such as an ultraviolet absorber or a fluorescent brightener to a plurality of color pixels such as red, green and blue used as a mask. As a result, even when exposure is performed from the back side of the transparent substrate, a sufficient degree of cross-linking is exhibited, the spaces between the respective color pixels are filled, and, as in the prior art, there are two protrusions due to the overlap between each color pixel and the black matrix. It does not occur, and the optical characteristics as a color filter, that is, transparency and contrast ratio are not significantly impaired, and the color is vivid. Further, since the polymer compound is chemically bonded to the carbon black, only the resin does not flow out with the developer or the like, and the film strength of the black matrix becomes extremely high.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a cross-sectional structure of an embodiment of a color filter according to the present invention.
FIG. 2 is an explanatory view showing a cross-sectional structure in the middle of a process of an embodiment of a method for producing a color filter in the present invention.
[Explanation of symbols]
1 ... transparent substrate 2 ... multiple color pixels 3 ... black matrix

Claims (6)

  In a black photosensitive resin composition comprising carbon black grafted with a polymer compound, a resin-based material, a crosslinking agent and a photoacid generator, 100 parts by weight of the black photosensitive resin composition based on the nonvolatile solid content The grafted carbon black was 35 to 93.6 parts by weight, and when the black photosensitive resin composition was 100 parts by weight, the resin material was 1 to 35 parts by weight, and the crosslinking agent was 0.4-15 weight part and a photo-acid generator are 5-15 weight part, The black photosensitive resin composition characterized by the above-mentioned.   The polymer compound is one selected from an aziridine group, an oxazoline group, an N-hydroxyalkylamide group, an epoxy group, a thioepoxy group, an isocyanate group, a vinyl group, an acrylic group, a methacryl group, a silicon hydrolyzable group, and an amino group The black photosensitive resin composition according to claim 1, comprising two or more groups in the molecule.   The pH of the carbon black is 7 or less, and the ratio of the polymer compound to carbon black is 5 to 100 parts by weight when the carbon black is 100 parts by weight. Black photosensitive resin composition.   2. The black photosensitive resin composition according to claim 1, wherein the resin-based material is a polymer containing an OH group that can be a crosslinking point and being soluble in an alkaline aqueous solution. Color filter black matrix and a plurality of colors of pixels consisting of claims 1 to 4 black photosensitive resin composition, wherein the whatever child. The method for producing a color filter according to claim 5, comprising at least the following steps (1) to (5).
(1) providing a plurality of color pixels on a transparent substrate;
(2) The process of providing the black photosensitive resin composition of Claims 1-4 between the multiple color pixels formed on the transparent substrate and on the multiple color pixels,
(3) A step of generating an acid only in the black photosensitive resin composition layer between a plurality of color pixels by exposure from the transparent substrate side,
(4) A step of causing only the black photosensitive resin composition layer between a plurality of color pixels to undergo a crosslinking reaction by heating the transparent substrate after exposure,
(5) A step of dissolving and removing the unexposed black photosensitive resin composition on the plurality of color pixels from the heated transparent substrate.

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