JP5493381B2 - Coloring composition for color filter and color filter using the same - Google Patents

Description

  The present invention relates to a coloring composition for a color filter used for the production of a color filter used for a color liquid crystal display device, a color image pickup tube element, etc., and a color comprising a red or magenta color filter segment formed using the same. It relates to filters.

The color liquid crystal display device controls the amount of light passing through the second polarizing plate by controlling the degree of polarization of the light that has passed through the first polarizing plate by the liquid crystal layer sandwiched between the two polarizing plates. This is a display device that performs display by using a twisted nematic (TN) type liquid crystal. A liquid crystal display device is capable of color display by providing a color filter between two polarizing plates, and has recently been used in televisions, personal computer monitors, and the like. Along with the advancement, demands for a wide color reproduction area and high reliability are also increasing.
A color filter is a surface of a transparent substrate such as glass, in which two or more kinds of fine band (striped) filter segments of different hues are arranged in parallel or crossing each other, or fine filter segments are arranged vertically and horizontally. It is made up of those arranged in The filter segments are as fine as several microns to several hundreds of microns, and are regularly arranged in a predetermined arrangement for each hue.

Generally, in a color liquid crystal display device, a transparent electrode for driving a liquid crystal is formed on a color filter by vapor deposition or sputtering, and an alignment film for aligning the liquid crystal in a certain direction is further formed thereon. Yes. In order to sufficiently obtain the performance of these transparent electrodes and alignment films, the formation thereof must generally be performed at a high temperature of 200 ° C. or higher, preferably 230 ° C. or higher. For this reason, at present, as a method for producing a color filter, a method called a pigment dispersion method using a pigment having excellent light resistance and heat resistance as a colorant is mainly used.
In the pigment dispersion method, a color resist is formed by mixing and blending a photosensitive agent or an additive in a pigment in which pigment particles, which are pigments, are dispersed in a transparent resin, and this color resist is applied onto a substrate by a coating device such as a spin coater. In this method, a color filter is produced by forming a coating film by the above, performing selective exposure through a mask with an aligner or a stepper, patterning by alkali development and thermosetting, and repeating this operation.

The red filter segment, which is one of the three primary colors (red, blue, green; RGB) of the color filter substrate, has a diketopyrrolopyrrole pigment (for example, CI Pigment Red 254) or an anthraquinone as the main pigment. It is common to use pigments (eg CI Pigment Red 177). However, these pigments are advantageous for increasing the contrast and brightness, but have a limit in the color reproduction region as a coloring material.
In order to widen the color reproduction region, a technique for dissolving a dye, not a pigment, in a resin or the like has been proposed (for example, Patent Document 1). However, there is a problem that dyes are inferior in heat resistance, light resistance and solvent resistance compared to pigments.
In general, a color image pickup tube element is provided with color filters each having a filter segment of three primary colors of additive mixture of red, blue, and green (RGB) on the light receiving element for color separation. In recent years, the area per pixel has been decreasing due to the reduction in size and increase in the number of pixels of the color image sensor.

By using a color filter having this additive mixed three primary color filter segment, easy color separation and good color reproduction can be obtained, but the three primary color filter segments each transmit light in a narrow range near the main wavelength. The reduction in sensitivity is due to the fact that there is only a region and the reduction in the area per pixel due to the increase in the number of pixels.
In order to solve this problem, a color filter including yellow, magenta, and cyan (YMC) filter segments corresponding to the complementary colors of the three primary colors is used for the color image pickup tube element and the like. Complementary color filters often have higher sensitivity than primary color filters, and are therefore often used in video cameras and the like that do not readily use an auxiliary light source such as a flash.

  However, the complementary color pigment used for the complementary color filter has a very narrow selectable range, and it has been difficult to obtain a complementary color pigment having excellent spectral characteristics. This is one of the reasons why it is difficult to obtain excellent color reproducibility in an image sensor using a complementary color filter. In particular, the spectral characteristics of magenta are not sufficient. For example, C.I. which is a quinacridone-based magenta pigment. I. Since the pigment red 122 has a low transmittance on the short wavelength side (400 to 450 nm), the color balance tends to be lost. In addition, as a magenta dye used for a complementary color filter, rhodamine 6G (CI Basic Red 1), which is a basic dye, has a high transmittance even on a short wavelength side compared to the quinacridone-based magenta pigment. However, like the dye used for the color filter of the color liquid crystal display device, there is a problem that it is inferior in heat resistance, light resistance and solvent resistance as compared with the pigment.

As a method for improving the disadvantages of the magenta pigment and the magenta dye, rake formation of the dye is known (for example, Patent Documents 2 and 3). In this method, the dye is precipitated and fixed on the extender pigment with an appropriate precipitating agent to form an insoluble form in water, and is generally used as a dyed lake pigment or dyed lake pigment. However, even in a colored composition in which a dyed lake pigment is dispersed in a resin solution, there is a problem that the color characteristics (colorability and permeability) are not sufficiently satisfactory. Further, the heat resistance, light resistance, and solvent resistance were not at a level satisfying the high reliability required in recent years.
JP-A-6-75375 JP 2001-81348 A JP 2005-292305 A

The object of the present invention is to provide a stable color filter coloring composition having excellent color characteristics and heat resistance, light resistance and solvent resistance, and a wide color reproduction range using the color composition, and it has excellent heat resistance, light resistance and solvent resistance. It is to provide an excellent color filter.
Another object of the present invention is to provide a stable coloring composition for a color filter that is particularly excellent in dispersibility and transparency of a dye component, and excellent in color characteristics, heat resistance, light resistance, and solvent resistance.

The coloring composition for a color filter of the present invention is a coloring composition for a color filter comprising a pigment carrier comprising a transparent resin, a precursor thereof or a mixture thereof, and a metal lake pigment of a rhodamine dye, The precipitant used for rake formation of the pigment is a complex acid containing phosphorus (P).
The color filter of the present invention is a color filter comprising at least one red filter segment, at least one green filter segment, and at least one blue filter segment, wherein at least one red filter segment is colored for the color filter of the present invention. It is formed by a composition.
Further, the color filter of the present invention is a color filter comprising at least one magenta color filter segment, at least one cyan color filter segment, and at least one yellow color filter segment, wherein at least one magenta color filter segment is the present invention. It is formed by the coloring composition for color filters, It is characterized by the above-mentioned.

The coloring composition for a color filter of the present invention uses a metal lake pigment of a rhodamine dye that is a complex acid containing phosphorus (P) as a precipitant used for rake formation as a coloring material, and thus has excellent permeability. It has a wide color reproduction range and is excellent in heat resistance, light resistance, and solvent resistance.
By using the coloring composition for a color filter of the present invention, it is possible to form a color filter having a wide color reproduction range and excellent heat resistance, light resistance and solvent resistance.

First, the color filter coloring composition of the present invention will be described in detail.
The coloring composition for a color filter of the present invention is a metal of a rhodamine dye which is a complex acid containing a pigment carrier made of a transparent resin, a precursor thereof or a mixture thereof and a precipitant used for lake formation containing phosphorus (P). Including lake pigments.
(Pigment)
The coloring composition for a color filter of the present invention contains a rhodamine dye metal lake pigment as a colorant. Here, the precipitant used for rake formation of the pigment is a complex acid containing phosphorus (P).
The rhodamine dye metal lake pigment is obtained by adding a precipitant to the rhodamine dye solution, precipitating the rhodamine dye as insoluble fine particles, filtering, drying and pulverizing. The rhodamine dye solution is obtained by dissolving a rhodamine dye in a solvent.

Examples of the dye component constituting the rhodamine dye metal lake pigment include rhodamine dyes such as rhodamine B, rhodamine 3B, rhodamine 3G, rhodamine 6G, rhodamine 6GCP, rhodamine B base. Among these rhodamine dyes, rhodamine 6G, 6GCP (CI basic red 1, CI basic red 1: 1), rhodamine B (CI basic violet) are preferable because of their good color developability. 10) is preferred.
These rhodamine dyes can be used in combination as appropriate. For example, by using rhodamine 6G and rhodamine B in combination, it is possible to obtain a magenta, red, and violet colored metal lake pigment having fluorescence.

A complex acid containing phosphorus (P) is used as a precipitating agent for lake-forming rhodamine dyes.
In the present invention, phosphorus (P) -containing complex acid (COMPLEX ACID) is a heteropolyacid in which phosphorus (P), which is a hetero atom, is contained in an isopolyacid skeleton made of a metal such as tungsten, molybdenum, vanadium, or the like. . Examples of the complex acid containing phosphorus (P) include heteropolyacids that are inorganic oxygen acids such as phosphorus / molybdic acid, phosphorus / tungstic acid, and phosphorus / tungsten / molybdic acid. Specific examples of the structural formula include phosphorus / tungstic acid H ₃ [PW ₁₂ O ₄₀ ] · nH ₂ O (n≈30), phosphorus / molybdic acid H ₃ [PMo ₁₂ O ₄₀ ] · nH ₂ O (n≈ 30), phosphorus / tungsten / molybdate H ₃ [PW ₁₂ —XMo _X O ₄₀ ] · nH ₂ O (0 <X <12, n≈30), phosphorus / sodium molybdate Na [PMo ₁₂ O ₄₀ ] · nH ₂ O (n≈30).

Rhodamine dye metal lake pigments are obtained by adding these precipitating agents to the dye solution and precipitating them to form a lake.
At this time, the precipitating agent may be added in combination with a heteropolyacid such as sodium tungstate, dibasic sodium phosphate, or sodium molybdate so as to have a desired composition.
That is, the rhodamine dye metal lake pigment is a rhodamine dye deposited as an insoluble salt using a complex acid containing phosphorus (P).
A rhodamine dye metal lake pigment having a complex acid containing phosphorus (P) as a precipitating agent is preferable because it has excellent permeability and remarkably improves light resistance. This is because the phosphorus (P) component is excellent in solvent resistance. On the other hand, if a precipitating agent containing silicon (Si) as a hetero atom instead of phosphorus (P) is used, the solvent resistance of the rhodamine dye metal lake pigment is lowered, and the dispersion in the solvent and resin is poor. As a result, the colored composition becomes turbid, which is not preferable as a color filter material.

Molybdenum (Mo) contributes to stabilization of pigment coloration and increase in concentration, and tungsten (W) improves pigment permeability. This is because the ionic radius of tungsten (W) is larger than that of molybdenum (Mo). In the case of the present invention which is used for a color filter, it is necessary to consider permeability, and therefore complex acid containing phosphorus (P) and tungsten (W) is preferably used as a precipitant.
In the rhodamine dye metal lake pigment of the present invention, it is preferable that the ratio of tungsten (W) is larger than molybdenum (Mo) because the permeability is improved.

A metal lake pigment of a rhodamine dye preferably used in the present invention is represented by a color index (CI) number. I. Pigment Red 81 (precipitating agent: phosphorus, tungsten, molybdic acid containing P, W, and Mo), 81: 3 (same as above, phosphorus and molybdic acid containing Mo), 81: 4 (same as P, W) , Mo-containing phosphorus / tungsten / molybdic acid), C.I. I. Pigment Violet 1 (same as above: phosphorus, tungsten, molybdic acid containing P, W, Mo), 2 (same as above: phosphorus, tungsten, molybdic acid containing P, W, Mo), 2: 2 (same as: P, And red and reddish purple pigments such as W, Mo-containing phosphorus, tungsten, and molybdic acid.
Among them, C.I. I. Pigment red 81, 81: 4, C.I. I. Pigment violet 1 and 2 are preferable because they are pigments having excellent permeability.
By using these rhodamine dye metal lake pigments, it is possible to obtain a wide color reproduction region that cannot be obtained with other red pigments.

When the red filter segment is formed using the colored composition of the present invention, other red pigments, orange pigments, and yellow pigments can be used in combination for the purpose of color adjustment and complementary color.
Other red pigments that can be used in combination include C.I. I. Pigment Red 7, 14, 41, 48: 1, 48: 2, 48: 3, 48: 4, 146, 168, 177, 178, 184, 185, 187, 200, 208, 210, 242, 246, 254, And pigments such as 255, 264, 270, 272, and 279.
Examples of the orange pigment include C.I. I. And pigments such as CI Pigment Orange 43, 71 and 73.

  Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, And the like can be given 82,185,187,188,193,194,198,199,213,214.

Moreover, when forming a magenta color filter segment using the coloring composition of this invention, another red pigment can be used together for the purpose of color adjustment.
Other red pigments that can be used in combination include C.I. I. And pigments such as CI Pigment Red 122, 192, 202, 207, and 209.
In all the non-volatile components constituting the coloring composition, the preferred pigment concentration (when other pigments are used in combination, the concentration of all pigment components) is 10% by weight or more from the viewpoint of obtaining sufficient color reproducibility, More preferably, it is 15 weight% or more, Most preferably, it is 20 weight% or more. Further, from the viewpoint of obtaining the stability of the coloring composition, the preferable pigment concentration is 90% by weight or less, more preferably 80% by weight or less, and most preferably 70% by weight or less.

In the case of forming a red filter segment by using the coloring composition of the present invention, the preferable pigment ratio can widen the chromaticity region and obtain excellent spectral characteristics. % By weight), the rhodamine dye metal lake pigment is 40 to 100% by weight, the other red pigment is 0 to 60% by weight, the orange pigment is 0 to 60% by weight, and the yellow pigment is 0 to 50% by weight. .
More preferably, based on the total amount of pigment (100 wt%), the rhodamine dye metal lake pigment is 50 to 90 wt%, the other red pigment is 0 to 50 wt%, and the orange pigment is 0 to 45 wt%. The yellow pigment is 5 to 45% by weight.

In addition, a preferable pigment ratio when forming a magenta color filter segment using the colored composition of the present invention can widen the chromaticity region and obtain excellent spectral characteristics. As a reference (100% by weight), the rhodamine dye metal lake pigment is 60 to 100% by weight, and the other red pigments are 0 to 40% by weight.
More preferably, based on the total amount of the pigment (100% by weight), the rhodamine dye metal lake pigment is 70 to 100% by weight, and the other red pigments are 0 to 30% by weight.

(Miniaturization of pigment)
The rhodamine dye metal lake pigment and other pigments used in the coloring composition of the present invention can be refined by a salt milling treatment. The primary particle diameter of the pigment is preferably 20 nm or more because of good dispersion in the pigment carrier. Moreover, since it can form a filter segment with high contrast ratio, it is preferable that it is 100 nm or less. A particularly preferable range is a range of 25 to 85 nm. The primary particle diameter of the pigment was measured by directly measuring the size of the primary particle from an electron micrograph of the pigment using a TEM (transmission electron microscope). Specifically, the minor axis diameter and major axis diameter of the primary particles of each pigment were measured, and the average was taken as the particle diameter of the pigment particles. Next, for 100 or more pigment particles, the volume of each particle is obtained by approximating the obtained particle size cube, and the volume average particle size is defined as the average primary particle size.

Salt milling is a process in which a mixture of pigment, water-soluble inorganic salt and water-soluble organic solvent is heated using a kneader such as a kneader, two-roll mill, three-roll mill, ball mill, attritor, or sand mill. After kneading, the water-soluble inorganic salt and the water-soluble organic solvent are removed by washing with water. The water-soluble inorganic salt serves as a crushing aid, and the pigment is crushed using the high hardness of the inorganic salt during salt milling. By optimizing the conditions for salt milling the pigment, it is possible to obtain a pigment having a sharp particle size distribution with a very fine primary particle diameter and a wide distribution range.
As the water-soluble inorganic salt, sodium chloride, barium chloride, potassium chloride, sodium sulfate and the like can be used, but sodium chloride (salt) is preferably used from the viewpoint of cost. The water-soluble inorganic salt is preferably used in an amount of 50 to 2000% by weight, and most preferably 300 to 1000% by weight based on the total weight of the pigment (100% by weight) from the viewpoint of both processing efficiency and production efficiency.

  The water-soluble organic solvent functions to wet the pigment and the water-soluble inorganic salt, and is not particularly limited as long as it dissolves (mixes) in water and does not substantially dissolve the inorganic salt to be used. However, a high boiling point solvent having a boiling point of 120 ° C. or higher is preferable from the viewpoint of safety because the temperature rises during salt milling and the solvent is easily evaporated. For example, 2-methoxyethanol, 2-butoxyethanol, 2- (isopentyloxy) ethanol, 2- (hexyloxy) ethanol, diethylene glycol, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol, triethylene glycol monomethyl ether, Liquid polyethylene glycol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, dipropylene glycol, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, liquid polypropylene glycol and the like are used. The water-soluble organic solvent is preferably used in an amount of 5 to 1000% by weight, and most preferably 50 to 500% by weight, based on the total weight of the pigment (100% by weight).

  When the salt is milled, a resin may be added as necessary. The type of resin used is not particularly limited, and natural resins, modified natural resins, synthetic resins, synthetic resins modified with natural resins, and the like can be used. The resin used is solid at room temperature, preferably insoluble in water, and more preferably partially soluble in the organic solvent. The amount of resin used is preferably in the range of 5 to 200% by weight based on the total weight of the pigment (100% by weight).

(Pigment carrier)
The pigment carrier contained in the coloring composition of the present invention is for dispersing a pigment, and is composed of a transparent resin, a precursor thereof, or a mixture thereof.
The transparent resin is a resin having a spectral transmittance of preferably 80% or more, more preferably 95% or more in the entire wavelength region of 400 to 700 nm in the visible light region. Resins include thermoplastic resins, thermosetting resins, and active energy ray curable resins, and precursors thereof include monomers or oligomers that are cured by irradiation with active energy rays to form transparent resins, These can be used alone or in admixture of two or more. The pigment carrier is preferably used in an amount of 30% by weight or more based on the total weight of the pigment (100% by weight) because of its good film formability and various resistances, and has a high pigment concentration and good color characteristics. Is preferably used in an amount of 500% by weight or less.

When the pigment carrier comprises a mixture of a transparent resin and its precursor, the colored composition of the present invention can be prepared in the form of a solvent development type or alkali development type colored resist. When preparing in the form of an alkali development type colored resist, an alkali-soluble resin having an acidic group such as a (meth) acrylic acid copolymer resin (alkali-soluble acrylic resin) is used as a part of the pigment carrier.
Examples of the thermoplastic resin include butyral resin, styrene-maleic anhydride copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester. Examples thereof include resins, acrylic resins, alkyd resins, polystyrene resins, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene (HDPE, LDPE), polybutadiene, and polyimide resins.
Examples of the thermosetting resin include epoxy resin, benzoguanamine resin, rosin-modified maleic acid resin, rosin-modified fumaric acid resin, melamine resin, urea resin, and phenol resin.

As a monomer or oligomer that is cured by active energy ray irradiation to produce a transparent resin,
Methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, β-carboxyethyl (meth) acrylate, and tricyclodecanyl Monofunctional (meth) acrylates such as (meth) acrylate;
Bifunctional (meth) acrylates such as polyethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, and tripropylene glycol di (meth) acrylate;
Trifunctional or more polyfunctional compounds such as trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and dipentaerythritol penta (meth) acrylate Functional (meth) acrylate;
1,6-hexanediol diglycidyl ether, bisphenol A diglycidyl ether, neopentyl glycol diglycidyl ether, and epoxy (meth) acrylate which is a reaction product of an epoxy compound such as phenol novolac resin and (meth) acrylic acid;
Various (meth) acrylic acid esters modified with polyester, polyurethane, isocyanurate, methylolated melamine, etc .; and (meth) acrylic acid, styrene, vinyl acetate, hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol trivinyl ether, ( Examples include monomers other than (meth) acrylates such as (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-vinylformamide, and acrylonitrile, and these can be used alone or in combination of two or more. However, it is not necessarily limited to these.

(Photopolymerization initiator)
In the coloring composition for a color filter of the present invention, the pigment carrier contains a precursor of a transparent resin, and when the composition is cured by ultraviolet irradiation or a filter segment is formed by a photolithographic method, photopolymerization is performed. An initiator or the like is added. The blending amount when using the photopolymerization initiator is preferably 5 to 200% by weight based on the total weight of the pigment (100% by weight) from the viewpoint of photocurability and developability, and preferably 10 to 150% by weight. % Is more preferable.
Examples of the photopolymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- Hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane Acetophenone photopolymerization initiators such as -1-one, benzoin photopolymerization initiators such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzyldimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4 Benzophenone photopolymerization initiators such as phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4-benzoyl-4′-methyldiphenyl sulfide, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2 Thioxanthone photopolymerization initiators such as 2,4-diisopropylthioxanthone, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p -Methoxyphenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4,6-bis (Trichloromethyl) -s-triazine, 2,4-bis (trick (Romethyl) -6-styryl-s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxy-naphth-1-yl) -4 , 6-Bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, 2,4-trichloromethyl (4′-methoxystyryl) -6-triazine, etc. A polymerization initiator, a borate photopolymerization initiator, a carbazole photopolymerization initiator, an imidazole photopolymerization initiator, and the like are used, but are not necessarily limited thereto.

The above photopolymerization initiators are used alone or in combination of two or more. As sensitizers, α-acyloxy ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone. , Camphorquinone, ethylanthraquinone, 4,4′-diethylisophthalophenone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, 4,4′-diethylaminobenzophenone, etc. Although it can also be used together, it is not necessarily limited to these.
The blending amount when using the sensitizer is 3 to 60% by weight based on the blending weight of the photopolymerization initiator contained in the colored composition (100% by weight) from the viewpoint of photocurability and developability. It is preferably 5 to 50% by weight.

(Dispersing aid)
When dispersing the pigment in the pigment carrier, a dispersion aid such as a dye derivative, a resin-type pigment dispersant, and a surfactant can be appropriately used. The dispersion aid is excellent in dispersing the pigment and has a great effect of preventing re-aggregation of the pigment after dispersion. Therefore, when a coloring composition obtained by dispersing the pigment in the pigment carrier using the dispersion aid is used. Provides a color filter having a high spectral transmittance.
Examples of the dye derivative include a compound in which a basic substituent, an acidic substituent, or an optionally substituted phthalimidomethyl group is introduced into an organic pigment, anthraquinone, acridone, or triazine.

In the present invention, a pigment derivative is particularly preferable, and the structure thereof is a compound represented by the following general formula (1).
P-Ln Formula (1)
(However,
P: organic pigment residue, anthraquinone residue, acridone residue or triazine residue L: basic substituent, acidic substituent, or optionally substituted phthalimidomethyl group n: an integer of 1 to 4 is there)
Examples of the organic pigment constituting the organic pigment residue of P include, for example, diketopyrrolopyrrole pigments; azo pigments such as azo, disazo and polyazo; phthalocyanine pigments such as copper phthalocyanine, halogenated copper phthalocyanine and metal-free phthalocyanine Anthraquinone pigments such as aminoanthraquinone, diaminodianthraquinone, anthrapyrimidine, flavantron, anthanthrone, indanthrone, pyranthrone, violanthrone; quinacridone pigments; dioxazine pigments; perinone pigments; perylene pigments; thioindigo pigments; Indoline pigments; isoindolinone pigments; quinophthalone pigments; selenium pigments; metal complex pigments.

Examples of the dye derivative are described in JP-A-63-305173, JP-B-57-15620, JP-B-59-40172, JP-B-63-17102, JP-B-5-9469, and the like. What is currently used can be used, These can be used individually or in mixture of 2 or more types.
The blending amount of the pigment derivative is preferably 1 part by weight or more, more preferably 3 parts by weight or more, and most preferably 5 parts by weight or more with respect to 100 parts by weight of the pigment from the viewpoint of improving dispersibility. Further, from the viewpoint of heat resistance and light resistance, the amount is preferably 50 parts by weight or less, more preferably 30 parts by weight or less, and most preferably 25 parts by weight or less with respect to 100 parts by weight of the pigment.

  The resin-type pigment dispersant has a pigment affinity part that has the property of adsorbing to the pigment and a part that is compatible with the pigment carrier, and acts to stabilize the dispersion of the pigment on the pigment carrier by adsorbing to the pigment. It is something to do. Specific examples of resin-type pigment dispersants include polyurethanes, polycarboxylic acid esters such as polyacrylates, unsaturated polyamides, polycarboxylic acids, polycarboxylic acid (partial) amine salts, polycarboxylic acid ammonium salts, and polycarboxylic acid alkylamines. Salts, polysiloxanes, long-chain polyaminoamide phosphates, hydroxyl group-containing polycarboxylic acid esters, their modified products, amides formed by the reaction of poly (lower alkyleneimines) with polyesters having free carboxyl groups, and the like Oil-based dispersants such as salts, (meth) acrylic acid-styrene copolymers, (meth) acrylic acid- (meth) acrylic acid ester copolymers, styrene-maleic acid copolymers, polyvinyl alcohol, polyvinylpyrrolidone, and other water-soluble substances Resin, water-soluble polymer, polyester, modified Li acrylate, ethylene oxide / propylene oxide addition compound, phosphate ester-based and the like are used, they can be used alone or in admixture of two or more, not necessarily limited thereto.

  Surfactants include sodium lauryl sulfate, polyoxyethylene alkyl ether sulfate, sodium dodecylbenzene sulfonate, alkali salt of styrene-acrylic acid copolymer, sodium stearate, sodium alkyl naphthalene sulfonate, sodium alkyl diphenyl ether disulfonate Anionic surfactants such as lauryl sulfate monoethanolamine, lauryl sulfate triethanolamine, ammonium lauryl sulfate, monoethanolamine stearate, monoethanolamine of styrene-acrylic acid copolymer, polyoxyethylene alkyl ether phosphate; Polyoxyethylene oleyl ether, polyoxyethylene lauryl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene Nonionic surfactants such as alkyl ether phosphates, polyoxyethylene sorbitan monostearate and polyethylene glycol monolaurate; chaotic surfactants such as alkyl quaternary ammonium salts and their ethylene oxide adducts; alkyldimethylamino Examples include amphoteric surfactants such as alkylbetaines such as betaine acetate and alkylimidazolines, and these may be used alone or in admixture of two or more, but are not necessarily limited thereto.

(solvent)
In the colored composition of the present invention, the pigment is sufficiently dispersed in a pigment carrier, and applied to a glass substrate or the like so as to have a dry film thickness of 0.2 to 5 μm to form a filter segment. A solvent can be included for ease.
Examples of the solvent include 1,2,3-trichloropropane, 1,3-butanediol, 1,3-butylene glycol, 1,3-butylene glycol diacetate, 1,4-dioxane, 2-heptanone, and 2-methyl. -1,3-propanediol, 3,5,5-trimethyl-2-cyclohexen-1-one, 3,3,5-trimethylcyclohexanone, ethyl 3-ethoxypropionate, 3-methyl-1,3-butanediol 3-methoxy-3-methyl-1-butanol, 3-methoxy-3-methylbutyl acetate, 3-methoxybutanol, 3-methoxybutyl acetate, 4-heptanone, m-xylene, m-diethylbenzene, m-dichlorobenzene N, N-dimethylacetamide, N, N-dimethylformamide, n-butyl alcohol, n-butylbenzene, n-propyl acetate, o-xylene, o-chloroto Ene, o-diethylbenzene, o-dichlorobenzene, p-chlorotoluene, p-diethylbenzene, sec-butylbenzene, tert-butylbenzene, γ-butyrolactone, isobutyl alcohol, isophorone, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, ethylene Glycol monoisopropyl ether, ethylene glycol monoethyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol monotertiary butyl ether, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol monopropyl ether, ethylene glycol monohexyl ether, ethylene glycol Monomethyl ether, ethylene glycol Dimonomethyl ether acetate, diisobutyl ketone, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether, cyclohexanol, cyclohexanol acetate, cyclohexanone, dipropylene Glycol dimethyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether, dipropylene glycol monopropyl ether, dipropylene glycol mono Chill ether, diacetone alcohol, triacetin, tripropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, propylene glycol diacetate, propylene glycol phenyl ether, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, propylene glycol monobutyl ether, propylene glycol Monopropyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monomethyl ether propionate, benzyl alcohol, methyl isobutyl ketone, methyl cyclohexanol, n-amyl acetate, n-butyl acetate, isoamyl acetate, isobutyl acetate, Acetate Pills, and a dibasic acid ester and the like.

Among them, because of good dispersion of the pigment of the present invention, glycol acetates such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, and ketones such as cyclohexanone Is preferably used.
A solvent can be used individually by 1 type or in mixture of 2 or more types.
Since the solvent can adjust the colored composition to an appropriate viscosity and form a filter segment having a desired uniform film thickness, the amount is 800 to 4000% by weight based on the total weight of the pigment (100% by weight). It is preferable to use in.

(Other additives)
The colored composition of the present invention can contain a storage stabilizer in order to stabilize the viscosity of the composition over time.
Examples of the storage stabilizer include quaternary ammonium chlorides such as benzyltrimethylammonium chloride and diethylhydroxyamine; organic acids such as lactic acid and oxalic acid; methyl esters of the organic acids; catechols such as t-butylpyrocatechol Organic phosphines such as triphenylphosphine, tetraethylphosphine and tetraphenylphosphine; phosphites and the like.

(Method for producing colored composition)
The coloring composition of the present invention is a three-roll mill, a two-roll mill, a rhodamine dye metal lake pigment and, if necessary, a pigment used in combination with a transparent resin, a precursor thereof, or a mixture thereof. It can be produced by finely dispersing using various dispersing means such as a sand mill, a kneader, and an attritor. When the coloring composition of the present invention contains two or more pigments, it can be produced by mixing pigments separately dispersed on a pigment carrier.
The colored composition of the present invention is mixed with coarse particles of 5 μm or more, preferably coarse particles of 1 μm or more, more preferably 0.5 μm or more and coarse particles by means of centrifugation, sintered filter, membrane filter or the like. It is preferable to remove dust. When coarse particles are present, foreign matters remain in the color filter, causing problems in practical use, and in the coating process, foreign matters are clogged in the piping and nozzles, resulting in serious manufacturing problems.

Next, the color filter of the present invention will be described in detail.
The color filter of the present invention is a color filter comprising at least one red filter segment, at least one green filter segment, and at least one blue filter segment, wherein at least one red filter segment is colored for the color filter of the present invention. It is formed by a composition.
The color filter of the present invention is a color filter comprising at least one magenta color filter segment, at least one cyan color filter segment, and at least one yellow color filter segment, wherein the at least one magenta color filter segment It is formed with the coloring composition for color filters of the invention.

The color filter of the present invention can be produced by a printing method or a photolithography method.
The formation of the filter segment by the printing method can be patterned simply by repeating the printing and drying of the coloring composition prepared as the printing ink. Therefore, the color filter manufacturing method is low in cost and excellent in mass productivity. Furthermore, a fine pattern having high dimensional accuracy and smoothness can be printed by the development of printing technology. In order to perform printing, it is preferable that the ink does not dry and solidify on the printing plate or on the blanket. Control of ink fluidity on a printing press is also important, and ink viscosity can be adjusted with a dispersant or extender pigment.

  When forming a filter segment by a photolithography method, a coating composition such as spray coating, spin coating, slit coating, roll coating, or the like is applied to the transparent composition on the transparent composition prepared as the solvent developing type or alkali developing type coloring resist. To apply a dry film thickness of 0.2 to 5 μm. If necessary, the dried film is exposed to ultraviolet light through a mask having a predetermined pattern provided in contact with or non-contact with the film. Then, after immersing in a solvent or an alkaline developer or spraying the developer by spraying or the like to remove the uncured portion to form a desired pattern, the same operation is repeated for other colors to produce a color filter. be able to. Furthermore, in order to accelerate the polymerization of the colored resist, heating can be performed as necessary. According to the photolithography method, a color filter with higher accuracy than the above printing method can be manufactured.

In development, an aqueous solution such as sodium carbonate or sodium hydroxide is used as an alkali developer, and an organic alkali such as dimethylbenzylamine or triethanolamine can also be used. An antifoaming agent or a surfactant can also be added to the developer.
In order to increase the UV exposure sensitivity, after coating and drying the colored resist, a water-soluble or alkaline water-soluble resin such as polyvinyl alcohol or a water-soluble acrylic resin is applied and dried to form a film that prevents polymerization inhibition by oxygen. Thereafter, ultraviolet exposure can also be performed.
The color filter of the present invention can be produced by an electrodeposition method, a transfer method, etc. in addition to the above method, but the colored composition of the present invention can be used in any method. The electrodeposition method is a method for producing a color filter by using a transparent conductive film formed on a substrate and forming each color filter segment on the transparent conductive film by electrophoresis of colloidal particles. .
The transfer method is a method in which a filter segment is formed in advance on the surface of a peelable transfer base sheet, and the filter segment is transferred to a desired substrate.

The green filter segment can be formed using a normal green coloring composition including a green pigment and a pigment carrier. Examples of the green pigment include C.I. I. Pigment Green 7, 10, 36, 37, 58, etc. are used.
A yellow pigment can be used in combination with the green pigment. Examples of yellow pigments that can be used in combination include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 126, 127, 128, 129, 138, 139, 147, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 179, 180, 181, And the like can be given 82,185,187,188,193,194,198,199,213,214.

The blue filter segment can be formed using a normal blue coloring composition containing a blue pigment and a pigment carrier. Examples of blue pigments include C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64, etc. are used.
Blue pigments include C.I. I. Purple violet pigments such as CI Pigment Violet 19, 23, 27, 29, 30, 32, 37, 40, 42, and 50 can be used in combination.
The cyan filter segment can be formed using a normal cyan coloring composition containing a blue pigment and a pigment carrier. Examples of blue pigments include C.I. I. Blue pigments such as CI Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 60, 64 can be used, and among these, C.I. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, and 15: 6 are preferable.
The yellow filter segment can be formed using a normal yellow coloring composition containing a yellow pigment and a pigment carrier. As a yellow pigment, the pigment illustrated as a yellow pigment which can be used together with a green pigment can be used.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited thereto. In the examples and comparative examples, “part” means “part by weight”.
First, the acrylic resin solution and pigment dispersion used in Examples and Comparative Examples will be described.
(Synthesis of acrylic resin and preparation of its solution)
In a reaction vessel, 800 parts of cyclohexanone was heated to 100 ° C. while injecting nitrogen gas into the vessel, and at the same temperature, 80.0 parts of styrene, 40.0 parts of methacrylic acid, 85.0 parts of methyl methacrylate, n- A mixture of 95.0 parts of butyl methacrylate and 2.0 parts of azobisisobutyronitrile was added dropwise over 1 hour to carry out a polymerization reaction.
After the dropwise addition, the mixture was further reacted at 100 ° C. for 3 hours, then 2.0 parts of azobisisobutyronitrile dissolved in 50 parts of cyclohexanone was added, and the reaction was further continued at 100 ° C. for 1 hour. A cyclohexane solution of an acrylic resin having a weight average molecular weight of about 30,000 and an acid value of 87 mgKOH / g was obtained.
After cooling to room temperature, about 2 g of the resin solution is sampled, heated and dried at 180 ° C. for 20 minutes, and the nonvolatile content is measured. Based on the measurement result, the previously synthesized resin solution has a nonvolatile content of 20% by weight. Ethylene glycol monomethyl ether acetate was added to the solution to prepare an acrylic resin solution.
Here, the polymerization average molecular weight (Mw) of the acrylic resin was measured by using TSKgel column (manufactured by Tosoh Corporation) and GPC equipped with RI detector (manufactured by Tosoh Corporation, HLC-8120GPC) using THF as a developing solvent. The weight average molecular weight (Mw) in terms of polystyrene.
Moreover, the acid value of an acrylic resin is the acid value (mgKOH / g) measured based on the potentiometric titration method of JISK0070.

(Preparation of pigment dispersion 1)
A mixture having the following composition was stirred and mixed uniformly, and then dispersed with an Eiger mill (“Mini Model M-250 MKII” manufactured by Eiger Japan) for 2 hours, followed by filtration with a 5 μm filter to prepare Pigment Dispersion 1.
C. I. Pigment Red 81: 11.0 parts Dispersant (Nippon Lubrizol Corporation “Solspers 20000”): 1.0 part Acrylic resin solution: 40.0 parts Cyclohexanone: 48.0 parts (Preparation of pigment dispersions 2-19)
C. I. Pigment dispersions 2 to 19 were produced in the same manner as pigment dispersion 1, except that Pigment Red 81 was replaced with the pigments shown in Table 1. Table 1 also shows the precipitant when a rhodamine dye metal lake pigment was used to prepare the pigment dispersion.

(Preparation of resist material 1)
The following mixture was stirred and mixed so as to be uniform, and then filtered through a 1.0 μm filter to obtain an alkali developing resist material 1.
Pigment dispersion 1: 60.0 parts Acrylic resin solution prepared previously: 11.0 parts Trimethylolpropane triacrylate: 4.2 parts ("NK ester ATMPT" manufactured by Shin-Nakamura Chemical Co., Ltd.)
Photopolymerization initiator ("Irgacure 907" manufactured by Ciba Japan): 1.2 parts Sensitizer ("EAB-F" manufactured by Hodogaya Chemical Co., Ltd.): 0.4 parts Ethylene glycol monomethyl ether acetate: 23.2 parts

(Adjustment of resist materials 2 to 28)
Thereafter, alkali developing resist materials 2 to 28 were obtained in the same manner as the resist material 1 except that the pigment dispersion 1 was changed to the pigment dispersion shown in Table 2 and the blending amount. Although some resist materials use a pigment dispersion together, the total amount of the pigment dispersion is 60 parts in all resist materials.

[Examples 1 to 16 and Comparative Examples 1 to 5: Evaluation of resist material]
Of the resist materials obtained, weather resistance (heat resistance, light resistance, solvent resistance) test of red resist material and magenta color resist material coating film using rhodamine dye metal lake pigment was conducted by the following method. It was. Table 3 shows the results of the weather resistance test.
(Method of coating heat resistance test)
A resist material is applied on a transparent substrate so that the dry coating thickness is about 2.5 μm, and after UV exposure through a mask having a predetermined pattern, an alkali developer is sprayed to remove uncured parts. As a result, a desired pattern was formed. Then, after heating in an oven at 230 ° C. for 1 hour and allowing to cool, the color difference 1 (L * (1), a * (1), b * (1)) of the obtained coating film with a C light source was measured by a microspectrophotometer. (Olympus Optical Co., Ltd. “OSP-SP200”). Then, as a heat resistance test, the sample was heated in an oven at 250 ° C. for 1 hour, and a color difference 2 (L * (2), a * (2), b * (2)) with a C light source was measured.
Using the measured color difference value, the color difference change rate ΔEab * was calculated by the following calculation formula, and the heat resistance of the coating film was evaluated in the following three stages.
ΔEab * = √ ((L * (2)-L * (1)) ² + (a * (2)-a * (1)) ² + (b * (2)-b * (1)) ² )
○: ΔEab * is less than 2.5
Δ: ΔEab * is 2.5 or more and less than 5.0 ×: ΔEab * is 5.0 or more

(Method of coating light resistance test)
A test substrate was prepared in the same procedure as the coating heat resistance test, and the color difference 1 (L * (1), a * (1), b * (1)) with a C light source was measured using a microspectrophotometer (Olympus Optical Co., Ltd.) It was measured using “OSP-SP200” manufactured by the manufacturer. Thereafter, the substrate was placed in a light resistance tester (“SUNTEST CPS +” manufactured by TOYOSEIKI) and left for 500 hours. After taking out the substrate, the color difference 2 (L * (2), a * (2), b * (2)) with a C light source is measured, and the color difference change rate ΔEab * is calculated in the same manner as in the coating heat resistance test. The light resistance of the coating film was evaluated in three stages according to the same criteria as the heat resistance.

(Method of coating solvent resistance test)
A test substrate was prepared in the same procedure as the heat resistance test, and a color difference 1 (L * (1), a * (1), b * (1)) with a C light source was measured with a microspectrophotometer (manufactured by Olympus Optical Co., Ltd.). OSP-SP200 "). Thereafter, the substrate was immersed in N-methylpyrrolidone for 30 minutes. After taking out the substrate, the color difference 2 (L * (2), a * (2), b * (2)) with a C light source is measured, and the color difference change rate ΔEab * is calculated in the same manner as in the coating heat resistance test. The solvent resistance of the coating film was evaluated in three stages according to the same criteria as the heat resistance.

The resist materials of Examples 1 to 15 using rhodamine-based dye metal lake pigments, which are complex acids containing phosphorus as a precipitant, had good weather resistance. The resist material of Example 16 uses a rhodamine dye metal lake pigment (CI Pigment Violet 1: 2), which is a complex acid containing no phosphorus as a precipitant, so that the weather resistance is slightly poor. However, the quality was satisfactory for use in color filters. On the other hand, the resist materials of Comparative Examples 1 to 5 use only the rhodamine dye metal lake pigment, which is a complex acid containing no phosphorus as the rhodamine dye metal lake pigment. Gave bad results.

[Examples 17 to 33 and Comparative Examples 6 to 12: Evaluation of color filters]
A color filter was prepared using the resist material shown in Table 4, and its quality was confirmed. First, a method for manufacturing a color filter will be described.
(Production of color filter)
A black matrix was patterned on a glass substrate, and a resist material 1 was applied on the substrate with a spin coater to form a colored film. The film was irradiated with ultraviolet rays of 300 mJ / cm ² through a photomask using an ultrahigh pressure mercury lamp. Next, the undeveloped portion was removed by spray development with an alkali developer composed of a 2% by weight aqueous sodium carbonate solution, and then washed with ion-exchanged water. The substrate was heated at 230 ° C. for 20 minutes to obtain a film thickness of 2.5 μm. Red filter segments were formed. In the same manner, a green color filter segment and a blue color filter segment having a film thickness of 2.5 μm were formed using the resist materials 12 and 13 to obtain a primary color filter (Example 17). Hereinafter, primary color filters of Examples 18 to 24 and Comparative Examples 6 to 8 were obtained in the same manner using combinations of resist materials shown in Table 4. Further, by the same method, a cyan, yellow, and magenta filter segment having a film thickness of 2.5 μm was formed by a combination of resist materials shown in Table 4, and complementary colors of Examples 25 to 33 and Comparative Examples 9 to 12 A color filter was obtained.

In the primary color filters obtained in Examples 17 to 24 and Comparative Examples 6 to 8, color reproducibility was evaluated by the following method. In addition, in the complementary color filters obtained in Examples 25 to 33 and Comparative Examples 9 to 12, spectral characteristics were evaluated by the following method.
(Evaluation of color reproducibility in primary color filters)
The chromaticity of RGB 3 colors when the obtained color filter was irradiated with light using a cold cathode fluorescent tube light source was determined. The area of the triangle with the chromaticity of the three RGB colors as the vertex is the NTSC ratio of the color filter (standard primary colors defined by the US National Television System Committee (NTSC), red (0.67, 0.33), green (0.21, The color reproducibility (color re-reduction area) was evaluated at a ratio when the area of a triangle of three colors RGB defined in 0.71) and blue (area surrounded by blue (0.14, 0.08)) was 100.

(Evaluation method of spectral characteristics in complementary color filters)
Spectral characteristics were measured using a microspectrophotometer (“OSP-SP100” manufactured by Olympus Optical Co., Ltd.). The spectral characteristics were evaluated according to the following three stages according to the value of the maximum transmittance at a wavelength of 400 to 450 nm.
○: Maximum transmittance at 400 to 450 nm is 80% or more
Δ: The value of the maximum transmittance at 400 to 450 nm is 70% or more and less than 80%. X: The value of the maximum transmittance at 400 to 450 nm is less than 70%. The evaluation result of the color reproducibility and spectral characteristics of the obtained color filter. Table 5 shows. In Table 5, the numbers of the red resist material or magenta resist material used for each color filter and the results of weather resistance evaluation are also shown.

The color filters of Examples 17-24 produced using a resist material containing a metal lake pigment of a rhodamine dye, which is a complex acid containing phosphorus as a precipitant, have good color reproducibility, and the colors of Examples 25-32 The filter had good spectral characteristics. The resist material 22 used for producing the color filter of Example 33 is C.I. I. Since the pigment red 122 is used in combination, the spectral characteristics are slightly inferior, but the color filter has no problem in use. On the other hand, in the color filters of Comparative Examples 6, 7, and 9 to 11, the resist material used for the production uses a metal lake pigment of rhodamine dye and has good color reproducibility, but is used for rake formation. Since the precipitating agent contains silicon (Si) instead of phosphorus (P), the color filter was inferior in weather resistance. Further, the color filters of Comparative Examples 8 and 12 did not have good color reproducibility and spectral characteristics because the resist materials used for the production did not contain a rhodamine dye metal lake pigment.
From these results, when using a rhodamine dye metal lake pigment that is a complex acid containing phosphorus as a precipitant used for rake formation in a red or magenta resist material, color reproducibility and spectral characteristics are good and weather resistance is improved. A color filter with good properties can be obtained.

Claims (3)

A coloring composition for a color filter comprising a pigment carrier comprising a transparent resin, a precursor thereof or a mixture thereof, and a metal lake pigment of a rhodamine dye,
And, for a color filter coloring composition, a color filter coloring composition for forming a red filter segmenting DOO,
The pigment carrier includes a transparent resin precursor, and further contains a photopolymerization initiator,
Rhodamine dye metal lake pigments include C.I. I. Pigment Red 81, 81: Ri der any of the four,
A color filter for coloring composition for forming a red filter segment, further
Is a red pigment (1) C. I. Pigment Re' de 254,
C. is an orange pigment. I. Pigment Orange 71,
And a yellow pigment C. I. Pigment Yellow over 139, a color filter coloring composition characterized Rukoto that Yusuke containing one or more pigments selected from the group consisting of.   The color filter coloring composition for forming the red filter segment is composed of 50 to 90% by weight of the rhodamine dye metal lake pigment, 0 to 50% by weight of the red pigment (1), and the orange pigment, based on the total amount of the pigment The coloring composition for a color filter according to claim 1, wherein 0 to 45% by weight of the yellow pigment and 5 to 45% by weight of the yellow pigment. 3. A color filter comprising at least one red filter segment, at least one green filter segment and at least one blue filter segment, wherein at least one red filter segment is formed by the color filter coloring composition according to claim 1 or 2. Color filter.