JP5444760B2 - Coloring composition for color filter and color filter - Google Patents

Description

  The present invention relates to a color composition for a color filter used for producing a color filter used for a color liquid crystal display device, a color image pickup tube element, and the like, and a color filter formed using the same.

  In the liquid crystal display device, a liquid crystal layer sandwiched between two polarizing plates controls the amount of light passing through the first polarizing plate by controlling the degree of polarization of light passing through the first polarizing plate. The type using twisted nematic (TN) type liquid crystal is the mainstream. Liquid crystal display devices are capable of color display by providing a color filter between two polarizing plates. Recently, liquid crystal display devices have been used in televisions, personal computer monitors, etc., and demand for higher contrast for color filters. Is growing.

  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 liquid crystal is formed on a color filter by vapor deposition or sputtering, and an alignment film for aligning liquid crystal in a certain direction is further formed thereon. ing. 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.

  However, in general, a color filter in which a pigment is dispersed has a problem that the degree of polarization controlled by the liquid crystal is disturbed due to light scattering by the pigment. That is, since light leaks when light must be blocked (OFF state) or transmitted light attenuates when light must be transmitted (ON state), display devices in the ON state and the OFF state There is a problem that the upper luminance ratio (contrast ratio) is low.

  Until now, in order to realize high brightness and high contrast of the color filter, the pigment contained in the filter segment has been refined. However, various pigments (similarly called crudes having a particle size of 10 to 100 μm produced by chemical reaction, which are made into a mixture of primary particles and aggregated secondary particles by pigmentation treatment) Even if the particles are refined by the refinement treatment method, the pigments whose primary particles or secondary particles have been refined generally tend to agglomerate. When the refinement is too advanced, a huge lump of pigment solid is formed. End up. Furthermore, even if the finely-divided pigment is dispersed in a pigment carrier containing a resin or the like, and the secondary particles of the pigment are stabilized as close as possible to the primary particles, a stable coloring composition is obtained. It is very difficult.

  In addition, it is difficult to disperse the pigment in a stable high concentration because the coloring composition for the color filter formed by dispersing in the pigment carrier containing the pigment and the resin subjected to the fine processing is difficult to manufacture. It is known to cause various problems.

  For example, pigment compositions containing pigments composed of fine particles often exhibit high viscosity, making it difficult to remove and transport the product from a disperser, and in the worst case, cause gelation during storage, It may even be difficult to use. Furthermore, regarding the surface of the color-extended product of the pigment composition, a poor state such as a decrease in gloss and a leveling failure occurs. When different types of pigments are mixed and used, color unevenness due to aggregation or phenomena such as sedimentation may cause uneven color and a marked decrease in coloring power.

  Therefore, in general, a resin-type dispersant is used in order to keep the dispersion state good. The resin-type dispersant has a structure of a part that is adsorbed to the pigment and a part that has a high affinity for the solvent as the dispersion medium, and the performance is determined by the balance of these two functional parts. Various resin-type dispersants are used according to the surface state of the pigment to be dispersed. However, an acidic functional group having electrostatic adsorption is added to a pigment having a surface that is biased toward basicity. It is common to use dispersants that have. In this case, the acidic functional group becomes the adsorption site of the pigment. Resin-type dispersants having a carboxyl group as an acidic functional group are described in, for example, Patent Document 1, Patent Document 2, and the like.

  However, on the other hand, dispersants having acidic functional groups are often not effective for pigments having acidic surfaces. Therefore, a basic dispersant is used for the pigment having an acidic surface, and the structure of the basic dispersant is often controlled to have a block structure or a comb structure. However, in the case of the block type, it is necessary to use a complicated polymerization method such as living radical polymerization (see Patent Document 3) for the production, which increases the cost. In the case of a comb shape, a portion of a comb tooth having a functional group such as a carboxyl group or an acryloyl group is grafted to a polyamine compound having a primary and / or secondary amino group, and the remaining primary and / or remaining There is a method in which a secondary amine is used as a functional group that adsorbs to the pigment surface (see Patent Document 4), but primary and / or secondary amines are not preferred because they have highly reactive active hydrogen.

  Also proposed is a method of maintaining a good dispersion state of the pigment by using a dispersant having an acidic functional group and a basic resin that is not structure-controlled without using a structure-controlled dispersant. (See Patent Document 5). However, the basic resin described here was sufficiently effective when the pigment particle diameter was relatively large, such as normal paint use, offset ink use, gravure ink use, etc., but color filter ink use etc. The fluidity and storage stability were insufficient for finer pigments.

JP-A-61-61623 JP-A-1-141968 JP 2002-534542 A JP-A-8-038875 JP-A-5-9405

  An object of this invention is to provide the coloring composition for color filters containing an acidic pigment excellent in the dispersibility, fluidity | liquidity, and storage stability, and a color filter using the same.

The problem is
Acidic pigments,
Dispersant (A) formed by reacting a hydroxyl group of a vinyl polymer having a hydroxyl group at one end region with an acid anhydride group of an aromatic tetracarboxylic dianhydride,
Vinyl resin (B) having a tertiary amino group,
Organic solvent (C),
Active energy ray polymerizable monomer (D),
Active energy ray polymerization initiator (E), and
Binder resin (F),
It solves by the coloring composition for color filters formed by containing.

  In addition, the present invention relates to the coloring composition for a color filter, wherein the acid pigment has an amine adsorption capacity of 50 μmol / g or more and 700 μmol / g or less.

  The present invention also provides an aromatic carboxyl group in the dispersant (A) obtained by reacting a hydroxyl group of a vinyl polymer having a hydroxyl group at one end region with an acid anhydride group of an aromatic tetracarboxylic dianhydride. The ratio <b> / <a> between the number of moles <a> and the number of moles <b> of the tertiary amino groups in the vinyl resin (B) having a tertiary amino group is 1.1-5. It is related with the coloring composition for color filters characterized by being 0.0.

  In the present invention, the organic solvent (C) is cyclohexyl acetate, propylene glycol diacetate, diethylene glycol diethyl ether, ethyl 3-ethoxypropionate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether acetate. And a coloring composition for a color filter, which is one or more solvents selected from the group consisting of ethylene glycol monoethyl ether acetate.

  Furthermore, it is related with the color filter characterized by including the filter segment formed from the said coloring composition for color filters.

  According to the present invention, it is possible to provide a coloring composition for a color filter containing an acidic pigment, which is excellent in dispersibility, fluidity, and storage stability, and a color filter using the same.

It is a conceptual diagram of the measuring apparatus for measuring a contrast ratio.

DESCRIPTION OF SYMBOLS 1 Luminometer 2 Mask 3 Polarizing plate 4 Colored composition dry coating film 5 Glass substrate 6 Polarizing plate 7 Backlight unit

  First, various components of the coloring composition for a color filter of the present invention will be described.

  In the present application, “(meth) acryloyl”, “(meth) acryl”, “(meth) acrylic acid”, “(meth) acrylate”, “(meth) acryloyloxy”, or “(meth) acrylamide” When expressed, unless otherwise specified, “acryloyl and / or methacryloyl”, “acrylic and / or methacrylic”, “acrylic acid and / or methacrylic acid”, “acrylate and / or methacrylate”, “acryloyl”, respectively. It shall represent “oxy and / or methacryloyloxy” or “acrylamide and / or methacrylamide”.

<Pigment>
The coloring composition for a color filter of the present invention is characterized by using at least an acidic pigment. The acidic pigment of the present invention is a pigment whose surface is biased to be acidic, and its acidity index is 50 to 700 μmol / g, more preferably 100 to 600 μmol / g, in terms of the amount of adsorption of amine. preferable. The amine adsorption amount referred to in the present invention is defined as a case where n-hexylamine is measured as an adsorbed amine substance in accordance with the method described in Coloring Materials, 67 [9], 547-554 (1994).

  Pigment Green 58 (halogenated zinc phthalocyanine green pigment, amine adsorption amount 200 to 700 μmol / g) and Pigment Yellow 150 (azomethine yellow pigment, amine adsorption amount 100 to 250 μmol / g) Etc.

    Moreover, as a pigment used for this invention, it is preferable that the number average particle diameter confirmed with an electron microscope is 5-200 nm.

  The pigment used in the present invention can be used in combination with not only an acidic pigment as a main pigment but also other non-acidic pigments for the purpose of color adjustment and complementary color.

[Miniaturization of pigments]
It is preferable that the acidic pigment used for the coloring composition of the present invention is subjected to a salt milling process and refined.

  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 works as a crushing aid, and it is thought that the pigment is crushed using the high hardness of the inorganic salt during salt milling, thereby generating an active surface and causing crystal growth. Yes. Therefore, the crushing of the pigment and the crystal growth occur simultaneously during the kneading, and the primary particle diameter of the pigment obtained varies depending on the kneading conditions.

  In order to promote crystal growth by heating, the heating temperature is preferably 40 to 150 ° C. When the heating temperature is less than 40 ° C., crystal growth does not occur sufficiently, and the shape of the pigment particles becomes close to amorphous, which is not preferable. On the other hand, when the heating temperature exceeds 150 ° C., crystal growth proceeds excessively and the primary particle diameter of the pigment becomes large, which is not preferable as a colorant for the color filter coloring composition. The kneading time for the salt milling treatment is preferably 2 to 24 hours from the viewpoint of the balance between the particle size distribution of the primary particles of the salt milling treatment pigment and the cost required for the salt milling treatment.

  By optimizing the conditions at the time of subjecting the pigment to salt milling, it is possible to obtain a pigment having a very fine primary particle diameter, a wide distribution range, and a sharp particle size distribution.

  It is preferable that the primary particle diameter calculated | required by TEM (transmission electron microscope) of the pigment used for the coloring composition of this invention is the range of 5-100 nm. When it becomes smaller than 20 nm, dispersion in an organic solvent becomes difficult. On the other hand, if it exceeds 100 nm, a sufficient contrast ratio cannot be obtained. A particularly preferable range is 5 to 20 nm.

  As the water-soluble inorganic salt used for the salt milling treatment, 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 2,000% by weight, and most preferably 300 to 1,000% by weight, based on the total amount of pigment, from the viewpoint of both processing efficiency and production efficiency.

  The water-soluble organic solvent is not particularly limited as long as it functions to wet the pigment and the water-soluble inorganic salt and 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 1,000 parts by weight, most preferably 50 to 500 parts by weight, based on 100 parts by weight of the pigment.

  When performing the salt milling treatment, 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 the resin used is preferably in the range of 5 to 200 parts by weight with respect to 100 parts by weight of the pigment.

<< Dispersant (A) >>
First, a vinyl polymer having a hydroxyl group in one end region as a raw material for the dispersant (A) will be described. As the vinyl polymer having a hydroxyl group in one terminal region, a polymer represented by the following general formula (1) is preferable.

  General formula (1):

〔一般式（１）中、
Ｙ²は、ビニル重合体の重合停止基であり、
Ｚ²は、−ＯＨ、又はＲ²⁸（ＯＨ）₂であり、
Ｒ²⁸は、炭素原子数１〜１８の３価の炭化水素基であり、
Ｒ²¹及びＲ²²は、それぞれ独立に水素原子又はメチル基であり、
Ｒ²³及びＲ²⁴は、いずれか一方が水素原子、他の一方が芳香族基、又は−Ｃ（＝Ｏ）−Ｘ⁶−Ｒ²⁵（但し、Ｘ⁶は、−Ｏ−若しくは−Ｎ（Ｒ²⁶）−であり、
前記Ｒ²⁵及びＲ²⁶は、水素原子又は炭素原子数１〜１８の直鎖状若しくは分岐状のアルキル基で置換基として芳香族基を有していることができるものであり、
Ｘ⁴は、直接結合、−Ｏ−Ｒ²⁷−又はＳ−Ｒ²⁷−であり、
前記Ｒ²⁷は、炭素数１〜１８の直鎖状若しくは分岐状のアルキレン基であり、
ｎは、２〜５０である。〕

[In general formula (1),
Y ² is a polymerization stopping group of the vinyl polymer,
Z ² is —OH or R ²⁸ (OH) ₂ ,
R ²⁸ is a trivalent hydrocarbon group having 1 to 18 carbon atoms,
R ²¹ and R ²² are each independently a hydrogen atom or a methyl group,
One of R ²³ and R ²⁴ is a hydrogen atom, the other is an aromatic group, or —C (═O) —X ⁶ —R ²⁵ (where X ⁶ is —O— or —N (R ²⁶ )-
R ²⁵ and R ²⁶ may be a hydrogen atom or a linear or branched alkyl group having 1 to 18 carbon atoms and may have an aromatic group as a substituent,
X ⁴ is a direct bond, —O—R ²⁷ — or S—R ²⁷ —,
R ²⁷ is a linear or branched alkylene group having 1 to 18 carbon atoms,
n is 2-50. ]

  The polymer represented by the general formula (1) is a vinyl polymer obtained by polymerizing an ethylenically unsaturated monomer.

The part of the repeating unit of the polymer represented by the general formula (1), that is, {-[C (R ²¹ ) (R ²³ ) -C (R ²² ) (R ²⁴ )] _n —} is mutually identical. (Homopolymer) made of a different material or (copolymer) made of a different material. In a preferred form of the polymer represented by the general formula (1), R ²¹ and R ²² are either a hydrogen atom, the other is a hydrogen atom or a methyl group, and R ²³ and R ²⁴ are either One is a hydrogen atom and the other is —C (═O) —O—R ²⁹ (R ²⁹ is a linear or branched alkyl group having 1 to 8 carbon atoms and has an aromatic group as a substituent. And —X ⁴ —Z ² is —S—CH ₂ CH ₂ —OH or —S—CH ₂ CH (OH) CH ₂ —OH.

Y ² in the general formula (1), that is, the polymerization termination group of the vinyl polymer is an arbitrary known polymerization termination introduced when the polymerization of a usual ethylenically unsaturated monomer is carried out by a usual method. And is obvious to those skilled in the art. Specifically, it can be, for example, a group derived from a polymerization initiator, a group derived from a chain transfer agent, a group derived from a solvent, or a group derived from an ethylenically unsaturated monomer. Even if Y ² has any of these chemical structures, the dispersant of the present invention can exert its effect without being influenced by the polymerization termination group Y ² .

Among the polymers represented by the general formula (1), those in which Z ² is —OH can be produced by a known method, for example, a compound having a hydroxyl group and a thiol group and an ethylenically unsaturated monomer. Can be obtained by mixing and heating.

As a compound having a hydroxyl group and a thiol group in the molecule, for example,
Examples include mercaptomethanol, 2-mercaptoethanol, 3-mercapto-1-propanol, 1-mercapto-2-butanol, and 2-mercapto-3-butanol.

Among the polymers represented by the general formula (1), those in which Z ² is —R ²⁸ (OH) ₂ can be produced by a known method, for example, a compound having two hydroxyl groups and one thiol group; It can be obtained by mixing and heating an ethylenically unsaturated monomer.

As a compound having two hydroxyl groups and one thiol group in the molecule, for example,
1-mercapto-1,1-methanediol, 1-mercapto-1,1-ethanediol, 3-mercapto-1,2-propanediol (thioglycerin), 2-mercapto-1,2-propanediol, 2- Mercapto-2-methyl-1,3-propanediol, 2-mercapto-2-ethyl-1,3-propanediol, 1-mercapto-2,2-propanediol, 2-mercaptoethyl-2-methyl-1, Examples include 3-propanediol and 2-mercaptoethyl-2-ethyl-1,3-propanediol.

  Preferably, bulk polymerization or solution polymerization is performed using a compound having 1 to 30 parts by weight of a hydroxyl group and a thiol group with respect to 100 parts by weight of the ethylenically unsaturated monomer. The reaction temperature is preferably 40 to 150 ° C., more preferably 50 to 110 ° C., and the reaction time is preferably 3 to 30 hours, more preferably 5 to 20 hours. If the compound having a hydroxyl group and a thiol group is less than 1 part by weight, the molecular weight may increase, and the year of the dispersion may increase, which may be undesirable. If it exceeds 30 parts by weight, the molecular weight is decreased, and the steric repulsion effect is decreased, which may not be preferable.

  Since the thiol group becomes a radical generating group for polymerizing the ethylenically unsaturated monomer, another polymerization initiator is not necessarily required for the polymerization, but it can also be used. When using this polymerization initiator, 0.001-5 weight part is preferable with respect to 100 weight part of ethylenically unsaturated monomers. As the polymerization initiator, for example, an azo compound and an organic peroxide can be used.

Examples of azo compounds include
2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile), 2,2′-azobis (2, 4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2′-azobis (2-methylpropionate), 4,4′-azobis ( 4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) propane] and the like.

Examples of organic peroxides include
Benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di (2-ethoxyethyl) peroxydicarbonate, t-butylperoxyneo Examples include decanoate, t-butyl peroxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, or diacetyl peroxide.

  These polymerization initiators can be used alone or in combination of two or more.

  Examples of the ethylenically unsaturated monomer include acrylic monomers and monomers other than acrylic monomers.

As an acrylic monomer, for example,
Methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, 2- Alkyl (meth) acrylates such as ethylhexyl (meth) acrylate, stearyl (meth) acrylate, or lauryl (meth) acrylate;
Cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentanyloxyethyl (meth9 acrylate, dicyclopentenyl (meth) acrylate, isobornyl (meth) acrylate, or adamantyl (meth) acrylate, etc. Formula alkyl (meth) acrylates;
(Meth) acrylates having a heterocyclic substituent such as tetrahydrofurfuryl (meth) acrylate or 3-methyloxetanyl (meth) acrylate;
(Meth) acrylates having an aromatic substituent such as phenyl (meth) acrylate, benzyl (meth) acrylate, phenoxyethylene oxide-modified (meth) acrylate, or paracumylphenoxyethylene oxide-modified (meth) acrylate;
Alkoxypolyalkylene glycol (meth) acrylates such as methoxypolypropylene glycol (meth) acrylate or ethoxypolyethylene glycol (meth) acrylate; or
(Meth) acrylamide (in the case of “(meth) acrylamide”, it means acrylamide and / or methacrylamide; the same shall apply hereinafter), N, N-dimethyl (meth) acrylamide, N, N -(Meth) acrylamides such as diethyl (meth) acrylamide, N-isopropyl (meth) acrylamide, diacetone (meth) acrylamide, or acryloylmorpholine.

Moreover, as a monomer other than the acrylic monomer, for example,
Styrenes such as styrene or α-methylstyrene;
Vinyl ethers such as ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, or isobutyl vinyl ether; or
Examples include vinyl acetate or fatty acid vinyls such as vinyl propionate. The monomer other than the acrylic monomer can be used in combination with the acrylic monomer.

  Moreover, a carboxyl group-containing ethylenically unsaturated monomer can be used alone or in combination with the monomer.

As the carboxyl group-containing ethylenically unsaturated monomer, for example,
One type or two or more types can be selected from acrylic acid, methacrylic acid, ε-couplerlactone-added acrylic acid, ε-couplerlactone-added methacrylic acid, itaconic acid, maleic acid, fumaric acid, and crotonic acid. .

  In the step of producing the polymer represented by the general formula (1), no solvent or a solvent can be used depending on the case.

As a solvent, for example,
Ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, xylene, acetone, hexane, methyl ethyl ketone, cyclohexanone, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol Although monoethyl ether acetate or diethylene glycol monobutyl ether acetate is used, it is not particularly limited to these. Two or more kinds of these polymerization solvents may be mixed and used.

  The amount of the solvent used is preferably 0 to 300 parts by weight, more preferably 0 to 100 parts by weight, based on 100 parts by weight of the ethylenically unsaturated monomer. The solvent used can be removed by an operation such as distillation after completion of the reaction, or can be used as it is as a part of the product of the dispersant.

  Next, the step of reacting the hydroxyl group of the vinyl polymer having a hydroxyl group at one terminal region with the acid anhydride group of the aromatic tetracarboxylic dianhydride will be described.

  Examples of the aromatic tetracarboxylic dianhydride include pyromellitic dianhydride, ethylene glycol ditrimellitic anhydride ester, propylene glycol ditrimellitic anhydride ester, butylene glycol ditrimellitic anhydride ester, 3, 3 ', 4,4'-benzophenone tetracarboxylic dianhydride, 2,2', 3,3'-benzophenone tetracarboxylic dianhydride, 3,3 ', 4,4'-biphenylsulfone tetracarboxylic dianhydride 2,2 ′, 3,3′-biphenylsulfonetetracarboxylic dianhydride, 1,4,5,8-naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride Anhydride, 3,3 ′, 4,4′-biphenyl ether tetracarboxylic dianhydride, 3,3 ′, 4,4′-dimethyldiph Nylsilanetetracarboxylic dianhydride, 3,3 ′, 4,4′-tetraphenylsilanetetracarboxylic dianhydride, 1,2,3,4-furantetracarboxylic dianhydride, 4,4′- Bis (3,4-dicarboxyphenoxy) diphenyl sulfide dianhydride, 4,4′-bis (3,4-dicarboxyphenoxy) diphenylsulfone dianhydride, 4,4′-bis (3,4-dicarboxy) Phenoxy) diphenylpropane dianhydride, 3,3 ′, 4,4′-perfluoroisopropylidene diphthalic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, bis (phthal Acid) phenylphosphine oxide dianhydride, p-phenylene-bis (triphenylphthalic acid) dianhydride, M-phenylene-bis (triphenylphthalic acid) dianhydride Bis (triphenylphthalic acid) -4,4′-diphenyl ether dianhydride, bis (triphenylphthalic acid) -4,4′-diphenylmethane dianhydride, 9,9-bis (3,4-dicarboxyphenyl) Examples include fluorene dianhydride, or 9,9-bis [4- (3,4-dicarboxyphenoxy) phenyl] fluorene dianhydride.

  The aromatic tetracarboxylic dianhydride used in the present invention is not limited to the compounds exemplified above, and may have any structure. These may be used alone or in combination. What is used in the present invention is preferably pyromellitic dianhydride from the viewpoint of dispersibility.

  When the number of moles of the hydroxyl group of the vinyl polymer having a hydroxyl group at one terminal region is <H> and the number of moles of the carboxylic acid anhydride group of the aromatic tetracarboxylic dianhydride is <N>, the reaction ratio is 0. .3 ≦ <H> / <N> ≦ 3 is preferable, and 0.5 ≦ <H> / <N> ≦ 2 is more preferable.

  A catalyst may be used for the reaction between the vinyl polymer having a hydroxyl group at one terminal region and the aromatic tetracarboxylic dianhydride.

As the catalyst, for example, a tertiary amine compound can be used,
Triethylamine, triethylenediamine, N, N-dimethylbenzylamine, N-methylmorpholine, 1,8-diazabicyclo- [5.4.0] -7-undecene, or 1,5-diazabicyclo- [4.3.0] -5-nonene and the like.

  The reaction between the hydroxyl group of the vinyl polymer having a hydroxyl group at one terminal region and the acid anhydride group of the aromatic tetracarboxylic dianhydride may be carried out without solvent or using a suitable dehydrated organic solvent. Also good. After completion of the reaction, the solvent used in the reaction can be removed by an operation such as distillation, or can be used as it is as a part of the product of the dispersant. Although the solvent to be used is not particularly limited, the solvent described in the process for producing the polymer represented by the general formula (1) can be used in the same manner.

  The reaction temperature between the hydroxyl group of the vinyl polymer having a hydroxyl group at one terminal region and the acid anhydride group of the aromatic tetracarboxylic dianhydride is preferably 50 ° C to 180 ° C, more preferably 60 ° C to 160 ° C. Do in range. When the reaction temperature is less than 50 ° C., the reaction rate is slow. When the reaction temperature exceeds 180 ° C., the acid anhydride that has reacted and opened the ring forms a cyclic anhydride again, which may make it difficult to complete the reaction.

<< Vinyl resin (B) >>
The vinyl resin (B) of the present invention has a tertiary amino group, and the amine value thereof is preferably 250 to 400 mgKOH / g from the viewpoints of the viscosity and viscosity stability of the colored composition of the present invention. A more preferred amine value range is 280 to 350 mg KOH / g.

  Furthermore, it is preferable that the vinyl resin (B) of the present invention has a hydroxyl value of 20 to 80 mgKOH / g. A more preferable range of the hydroxyl value is 30 to 60 mgKOH / g. When the hydroxyl value is 20 to 80 mgKOH / g, the heat resistance, solvent resistance, and chemical resistance of the film in the case of a color filter are improved.

  The number average molecular weight of the vinyl resin (B) of the present invention is preferably 500 to 30,000. If it is less than 500 or more than 30,000, the viscosity and viscosity stability of the pigment dispersion may deteriorate, which is not preferable.

  The vinyl resin (B) of the present invention comprises an ethylenically unsaturated monomer having a tertiary amino group, an ethylenically unsaturated monomer having a hydroxyl group in a preferred embodiment, and other ethylenically unsaturated monomers as required. It can be obtained by polymerizing with a monomer.

Examples of the ethylenically unsaturated monomer having a tertiary amino group include:
N, such as N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminoethyl (meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, or N, N-diethylaminopropyl (meth) acrylate N-dialkylamino group-containing (meth) acrylates;
N, such as N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, or N, N-diethylaminopropyl (meth) acrylamide Examples include N-dialkylamino group-containing (meth) acrylamides.

  Among these, N, N-dimethylaminoethyl (meth) acrylate is preferable from the viewpoint of dispersibility.

As an ethylenically unsaturated monomer having a hydroxyl group, for example,
Hydroxyalkyl such as 2-hydroxyethyl (meth) acrylate, 2 (or 3) -hydroxypropyl (meth) acrylate, 2 (or 3 or 4) -hydroxybutyl (meth) acrylate, or cyclohexanedimethanol mono (meth) acrylate (Meth) acrylates;
Alkyl-α-hydroxyalkyl acrylates such as ethyl-α-hydroxymethyl acrylate;
N- (hydroxyalkyl) (meth) such as N- (2-hydroxyethyl) (meth) acrylamide, N- (2-hydroxypropyl) (meth) acrylamide, or N- (2-hydroxybutyl) (meth) acrylamide Acrylamides;
Hydroxyalkyl vinyl ethers such as 2-hydroxyethyl vinyl ether, 2- (or 3-) hydroxypropyl vinyl ether, and 2- (or 3- or 4-) hydroxybutyl vinyl ether;
Examples thereof include hydroxyalkyl allyl ethers such as 2-hydroxyethyl allyl ether, 2- (or 3-) hydroxypropyl allyl ether, or 2- (or 3- or 4-) hydroxybutyl allyl ether.

  Moreover, the monomer which has two hydroxyl groups, such as glycerol mono (meth) acrylate, is also mentioned.

  Examples of other ethylenically unsaturated monomers include the acrylic monomers described in the process for producing the polymer represented by the general formula (1) and monomers other than acrylic monomers. Can be used arbitrarily.

  As the polymerization initiator, for example, the azo compound and the organic peroxide described in the process for producing the polymer represented by the general formula (1) can be used. When using this polymerization initiator, 0.01-20 weight part is preferable with respect to 100 weight part of ethylenically unsaturated monomers.

  Similarly to the step of producing the polymer represented by the general formula (1), a solvent-free or a solvent can be used in some cases.

As a solvent, for example,
Ethyl acetate, n-butyl acetate, isobutyl acetate, hexane, toluene, xylene, acetone, methyl ethyl ketone, methoxypropyl acetate, cyclohexanone, propylene glycol monomethyl ether acetate, dipropylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, ethylene glycol mono Although butyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, etc. are used, it is not limited to these, and can be arbitrarily selected from applications, costs and the like. Two or more kinds of polymerization solvents may be mixed and used.

  The amount of the solvent to be used is preferably 0 to 300 parts by weight, more preferably 0 to 100 parts by weight with respect to 100 parts by weight of the ethylenically unsaturated monomer. The solvent used can be removed by an operation such as distillation after completion of the reaction, or can be used as it is as a part of the product of the dispersant.

<Combination ratio>
In the pigment composition of the present invention, the blending ratio of the pigment, the dispersant (A), and the vinyl resin (B) is 5 to 100 parts by weight of the dispersant (A) with respect to 100 parts by weight of the pigment. The vinyl resin (B) is preferably 1 to 20 parts by weight, and further, the dispersant (A) is 10 to 50 parts by weight and the vinyl resin (B) is 2 parts with respect to 100 parts by weight of the pigment. It is preferable that it is -10 weight part. If the blending amount of the vinyl resin (B) is 20 parts by weight or more, coloring may be caused in the production process of the color filter and the hue may be changed.

  In the pigment composition of the present invention, the number of moles of aromatic carboxyl groups in the dispersant (A) is <a>, and the number of moles of tertiary amino groups in the vinyl resin (B) is <b>. When the ratio <b> / <a> is from 1.1 to 5.0, it is preferable from the viewpoint of dispersibility and stability of the dispersion, and more preferably from 1.3 to 4.5. .

<< Organic solvent (C) >>
In the coloring composition of the present invention, the pigment is sufficiently dispersed in components other than the pigment, and is applied onto a substrate such as a glass substrate so as to have a dry film thickness of 0.2 to 5 μm to form a filter segment. In order to facilitate this, an organic solvent is included.

As the organic solvent (C), a solvent having a solubility parameter (SP value) of 8.0 to 10.0 (cal / cm ³ ) ^1/2 and a boiling point of 140 to 200 ° C. at 760 mmHg is used. preferable.

Organic solvent (C)
One kind selected from cyclohexyl acetate, propylene glycol diacetate, diethylene glycol diethyl ether, ethyl 3-ethoxypropionate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether acetate, or ethylene glycol monoethyl ether acetate The above solvents are preferred.

  In addition, cyclohexyl acetate is also called cyclohexanol acetate.

  Of the above, propylene glycol monomethyl ether acetate, propylene glycol diacetate, or ethyl 3-ethoxypropionate is particularly preferred.

When the solubility parameter (SP value) is smaller than 8.0 (cal / cm ³ ) ^1/2 , the dispersion of the zinc halide phthalocyanine pigment becomes worse and more than 10.0 (cal / cm ³ ) ^1/2. When it is increased, the zinc halide phthalocyanine pigment is dissolved in the organic solvent, resulting in a decrease in brightness and contrast ratio.

  Further, if the boiling point is less than 140 ° C., film thickness unevenness and unevenness occur, which is not preferable. If the boiling point exceeds 200 ° C., tackiness remains, which is not preferable.

  The amount of the solvent added can be 800 to 4,000% by weight based on the total amount of the pigment.

  In addition, as described above, the organic solvent (C) used when dispersing the acidic pigment is preferably mainly the above-mentioned specific ones, but in order to facilitate the formation of the colored composition as a filter segment, The following organic solvents can be added as auxiliary solvents.

  1,2,3-trichloropropane, 1,3-butanediol, 1,3-butylene glycol, 1,3-butylene glycol diacetate, 1,4-dioxane, 2-heptanone, 2-methyl-1,3- Propanediol, 3,5,5-trimethyl-2-cyclohexen-1-one, 3,3,5-trimethylcyclohexanone, 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, N-methylpyrrolidone, o-xylene, o-chlorotoluene, 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 monotertiary butyl ether, ethylene glycol monobutyl ether, ethylene glycol monobutyl ether acetate, ethylene glycol monopropyl ether, ethylene glycol monohexyl ether, ethylene glycol monomethyl ether, diisobutyl ketone, diethylene glycol dimethyl ether, diethylene glycol monoisopro Ether, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether, diethylene glycol monobutyl ether acetate, diethylene glycol monomethyl ether, cyclohexanol, cyclohexanone, dipropylene glycol dimethyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol monobutyl ether , Dipropylene glycol monopropyl ether, dipropylene glycol monomethyl ether, diacetone alcohol, triacetin, tripropylene glycol monobutyl ether, tripropylene glycol monomethyl ether, propylene glycol phenyl ether, propylene glycol Cole monoethyl ether, propylene glycol monobutyl ether, propylene glycol monopropyl ether, propylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, benzyl alcohol, methyl isobutyl ketone, methylcyclohexanol, n-amyl acetate, n-butyl acetate, Isoamyl acetate, isobutyl acetate, propyl acetate, dibasic acid ester or the like is used.

  In order to obtain a preferable colored composition in the present invention, the organic solvent (C) is preferably 70% by weight or more in the total organic solvent. More preferably, the total is 80% by weight. The total is particularly preferably 85% by weight or more. If a large amount of an auxiliary solvent other than the organic solvent (C) is added, the stability of the acidic pigment dispersion and the coating property of the coating film coated with the coloring composition are adversely affected.

<< Active energy ray polymerizable monomer (D) >>
As monomers and oligomers that are polymerized by active energy ray irradiation to produce transparent resins,
Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth), tertiary butyl (meth) acrylate, isoamyl (meth) acrylate, octyl (Meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cetyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, lauryl (meth) acrylate, tridecyl (meth) acrylate, iso Linear or branched alkyl (meth) acrylates such as myristyl (meth) acrylate, stearyl (meth) acrylate, or isostearyl (meth) acrylate;
Cyclohexyl (meth) acrylate, Tertiarybutylcyclohexyl (meth) acrylate, Dicyclopentanyl (meth) acrylate, Dicyclopentanyloxyethyl (meth) acrylate, Dicyclopentenyl (meth) acrylate, Dicyclopentenyloxyethyl (meth) ) Acrylates or cyclic alkyl (meth) acrylates such as isobornyl (meth) acrylate;
Fluoroalkyl (meth) acrylates such as trifluoroethyl (meth) acrylate, octafluoropentyl (meth) acrylate, perfluorooctylethyl (meth) acrylate, or tetrafluoropropyl (meth) acrylate;
(Meth) acryloxy-modified polydimethylsiloxanes (silicone macromers);
(Meth) acrylates having a heterocyclic ring such as tetrahydrofurfuryl (meth) acrylate or 3-methyl-3-oxetanyl (meth) acrylate;
Benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxypolyethylene glycol (meth) acrylate, paracumylphenoxyethyl (meth) acrylate, paracumylphenoxypolyethylene glycol (meth) acrylate, or nonylphenoxypolyethylene glycol (meth) acrylate, etc. (Meth) acrylates having the following aromatic ring;
2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-methoxybutyl (meth) acrylate, 2-methoxypropyl (meth) acrylate, diethylene glycol monomethyl ether (meth) acrylate, diethylene glycol monoethyl ether (meta ) Acrylate, triethylene glycol monomethyl ether (meth) acrylate, triethylene glycol monoethyl ether (meth) acrylate, diethylene glycol mono-2-ethylhexyl ether (meth) acrylate, dipropylene glycol monomethyl ether (meth) acrylate, tripropylene glycol mono (Meth) acrylate, polyethylene glycol monolauryl ether (meth) acrylate, or polyester Glycol monostearyl ether (meth) acrylate of (poly) alkylene glycol monoalkyl ether (meth) acrylates;
(Meth) acrylic acid, acrylic acid dimer, itaconic acid, maleic acid, fumaric acid, crotonic acid, 2- (meth) acryloyloxyethyl phthalate, 2- (meth) acryloyloxypropyl phthalate, 2- (meth) acryloyloxyethyl Carboxyl groups such as hexahydrophthalate, 2- (meth) acryloyloxypropylhexahydrophthalate, ethylene oxide-modified succinic acid (meth) acrylate, β-carboxyethyl (meth) acrylate, or ω-carboxypolycaprolactone (meth) acrylate (Meth) acrylates having;
2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2- (meth) acryloyloxyethyl-2-hydroxyethyl Phthalate, diethylene glycol mono (meth) acrylate, dipropylene glycol mono (meth) acrylate, polyethylene glycol mono (meth) acrylate, propylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, polytetramethylene glycol mono (meth) Acrylate, poly (ethylene glycol-propylene glycol) mono (meth) acrylate, poly (ethylene glycol-tetramethylene glycol) mono (meth) Acrylate, poly (propylene glycol - tetramethylene glycol) mono (meth) acrylate, or having a hydroxyl group such as glycerol (meth) acrylate (meth) acrylates;
Ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, tri Propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, poly (ethylene glycol-propylene glycol) di (meth) acrylate, poly (ethylene glycol-tetramethylene glycol) di (meth) acrylate, poly (propylene glycol- Tetramethylene glycol) di (meth) acrylate, polytetramethylene glycol di (meth) acrylate, 1,3-butanediol di (Meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, or 2-ethyl, 2-butyl-propanediol di ( (Poly) alkylene glycol di (meth) acrylates such as (meth) acrylate,
Dimethylol dicyclopentane di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, stearic acid modified pentaerythritol di (meth) acrylate, ethylene oxide modified bisphenol A di (meth) acrylate, propylene oxide modified bisphenol A Di (meth) acrylate, tetramethylene oxide modified bisphenol A di (meth) acrylate, ethylene oxide modified bisphenol F di (meth) acrylate, propylene oxide modified bisphenol F di (meth) acrylate, tetramethylene oxide modified bisphenol F di (meth) Acrylate, zinc diacrylate, ethylene oxide-modified phosphate triacrylate, or glycerol di (meth) acrylate Di (meth) acrylate and the like;
(Meth) acrylates having a tertiary amino group such as dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, or diethylaminopropyl (meth) acrylate;
Glycerol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, or dipentaerythritol hexa (meth) acrylate Trifunctional or higher polyfunctional (meth) acrylates such as
Glycerol triglycidyl ether- (meth) acrylic acid adduct, glycerol diglycidyl ether- (meth) acrylic acid adduct, polyglycerol polyglycidyl ether- (meth) acrylic acid adduct, 1,6-butanediol diglycidyl ether, Alkyl glycidyl ether- (meth) acrylic acid adduct, allyl glycidyl ether- (meth) acrylic acid adduct, phenyl glycidyl ether- (meth) acrylic acid adduct, styrene oxide- (meth) acrylic acid adduct, bisphenol A di Glycidyl ether- (meth) acrylic acid adduct, propylene oxide-modified bisphenol A diglycidyl ether- (meth) acrylic acid adduct, bisphenol F diglycidyl ether- (meth) acrylic acid adduct, epichlorohydride -Modified phthalic acid- (meth) acrylic acid adduct, epichlorohydrin-modified hexahydrophthalic acid- (meth) acrylic acid adduct, ethylene glycol diglycidyl ether- (meth) acrylic acid adduct, polyethylene glycol diglycidyl ether- (meta ) Acrylic acid adduct, propylene glycol diglycidyl ether- (meth) acrylic acid adduct, polypropylene glycol diglycidyl ether- (meth) acrylic acid adduct, phenol novolac type epoxy resin- (meth) acrylic acid adduct, cresol novolac Type epoxy resin- (meth) acrylic acid adducts or other epoxy resins- (meth) acrylic acid adducts and other epoxy (meth) acrylates;
(Meth) acryloyl-modified isocyanurate, (meth) acryloyl-modified polyurethane, (meth) acryloyl-modified polyester, (meth) acryloyl-modified melamine, (meth) acryloyl-modified silicone, (meth) acryloyl-modified polybutadiene, or (meth) acryloyl-modified rosin (Meth) acryloyl-modified resin oligomers such as;
Vinyls such as styrene, α-methylstyrene, vinyl acetate, vinyl (meth) acrylate, and allyl (meth) acrylate;
Vinyl ethers such as hydroxyethyl vinyl ether, ethylene glycol divinyl ether, or pentaerythritol trivinyl ether;
Amides such as (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, or N-vinylformamide; or
Examples include acrylonitrile. These may be used alone or in combination of two or more, but are not necessarily limited thereto.

<< Active energy ray polymerization initiator (E) >>
When the composition is polymerized by ultraviolet irradiation or a filter segment is formed by a photolithographic method, an active energy ray polymerization initiator or the like is added to the colored composition for a color filter of the present invention. The amount of the active energy ray polymerization initiator used is preferably 5 to 200% by weight based on the total amount of the pigment, and 10 to 150% by weight from the viewpoint of active energy ray polymerizability and developability. More preferably.

As an active energy ray polymerization initiator,
4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2- Such as benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one or 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one An acetophenone-based active energy ray polymerization initiator;
Benzoin-based active energy ray polymerization initiators such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, or benzyldimethyl ketal;
Benzophenone-based active energy ray polymerization initiators such as benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, or 4-benzoyl-4′-methyldiphenyl sulfide;
Thioxanthone-based active energy ray polymerization initiators such as thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, or 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 (trichloro) Methyl) -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, or 2,4-trichloromethyl (4′-methoxystyryl) -6 Triazine-based active energy ray polymerization initiators such as triazine;
A borate-based active energy ray polymerization initiator; a carbazole-based active energy ray polymerization initiator; an imidazole-based active energy ray polymerization initiator; or an oxime ester-based active energy ray polymerization initiator is used.

  Of the above, ethanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (0-acetyloxime) and / or 1,2-octadione An oxime ester-based active energy ray polymerization initiator such as 1- [4- (phenylthio)-, 2- (O-benzoyloxime)] is most preferable.

  The oxime ester-based active energy ray polymerization initiator absorbs ultraviolet rays to cleave the N—O bond of the oxime to generate an iminyl radical and a benzoyloxy radical. Since these radicals are further decomposed to generate radicals with high activity, a color filter can be produced with a small amount of exposure, and the manufacturing time of the color filter can be shortened. Among them, the above two types are efficient.

The active energy ray polymerization initiator is used alone or in combination of two or more, but as a sensitizer,
α-acyloxy ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone, camphorquinone, ethylanthraquinone, 4,4′-diethylisophthalophenone, 3,3 ′, A compound such as 4,4′-tetra (t-butylperoxycarbonyl) benzophenone or 4,4′-diethylaminobenzophenone can also be used in combination.

  The blending amount when using the sensitizer is preferably 3 to 60% by weight based on the active energy ray polymerization initiator contained in the coloring composition. From the viewpoint of active energy ray polymerizability and developability. From 5 to 50% by weight is more preferable.

<< Binder resin (F) >>
Apart from the components (A) to (E) described above, the colored composition of the present invention contains a binder resin (F). As the binder resin (F), a thermoplastic resin, a thermosetting resin, and an energy ray curable resin are preferable, and the spectral transmittance is preferably 80% or more, more preferably 95 in the entire wavelength region of 400 to 700 nm in the visible light region. % Or more of the resin is preferable.

  The binder resin can be used in an amount of 30 to 500% by weight, based on the total weight of the pigment. If it is less than 30% by weight, the film formability and various resistances are insufficient, and if it exceeds 500% by weight, the pigment concentration is low and color characteristics may not be exhibited.

As a thermoplastic resin, for example,
Butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, polyester resin, vinyl resin (dispersant ( A), not including vinyl resin (B)), alkyd resin, polystyrene resin, polyamide resin, rubber resin, cyclized rubber resin, celluloses, polyethylene (HDPE, LDPE), polybutadiene, polyimide resin, etc. Can be mentioned.

Moreover, as a thermosetting resin, for example,
Examples thereof include an epoxy resin, a benzoguanamine resin, a rosin-modified maleic acid resin, a rosin-modified fumaric acid resin, a melamine resin, a urea resin, and a phenol resin.

  When the colored composition for color filter of the present invention is used in the form of an alkali development type colored resist, an alkali copolymerized with an acid group-containing ethylenically unsaturated monomer such as (meth) acrylic acid as the binder resin (F). It is preferable to use a soluble vinyl resin (f1).

  In order to preferably disperse the halogenated zinc phthalocyanine pigment, the weight average molecular weight (Mw) of the alkali-soluble resin is preferably in the range of 10,000 to 100,000, more preferably in the range of 30,000 to 80,000. . The number average molecular weight (Mn) is preferably in the range of 5,000 to 50,000, and the value of Mw / Mn is preferably 10 or less.

  Further, as the binder resin (F), an energy ray curable resin (f2) having an ethylenically unsaturated active double bond can be used. As a method for producing the resin (f2), as a precursor of the resin (f2), for example, a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, and an amino group is prepared, and an isocyanate group Then, a (meth) acryl compound having a reactive substituent such as an aldehyde group or an epoxy group or cinnamic acid was reacted to introduce a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer. A method of obtaining a resin, or a linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or an α-olefin-maleic anhydride copolymer has a hydroxyl group such as hydroxyalkyl (meth) acrylate There is a method of half-esterification with a (meth) acrylic compound.

  Among the binder resins (F), those having both alkali-soluble performance and energy ray curing performance can be used as those having both performance of the resin (f1) and the resin (f2).

《Other additives》
In the pigment dispersion of the present invention, as other additives, an active energy ray polymerization initiator, a chain transfer agent, a plasticizer, a surface conditioner, an ultraviolet ray inhibitor, a light stabilizer, an antioxidant, an antistatic agent, an antiblocking agent. A defoaming agent, a viscosity modifier, a wax, a surfactant, a leveling agent and the like can be added.

  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”.

In addition, the commercially available dispersant used for comparison was sampled about 2 g of the dispersant solution, heated and dried at 180 ° C. for 20 minutes, the nonvolatile content was measured, and the solvent was added so that the nonvolatile content was 25% by weight. did. (The solvent used in the commercially available dispersant was used as the dilution solvent.)
Prior to the examples, production examples of the dispersant of the dispersant (A) having an aromatic carboxyl group (A), the vinyl resin (B) having a tertiary amino group, and the resin (F) will be described.

<Production Example 1 of Dispersant of Dispersant (A) Having Aromatic Carboxyl Group>
In a reaction vessel equipped with a gas introduction tube, a condenser, a stirring blade, and a thermometer, 80 parts of methyl methacrylate, 120 parts of ethyl acrylate, and 40 parts of propylene glycol monomethyl ether acetate were charged and replaced with nitrogen gas. After heating the inside of the reaction vessel to 80 ° C. and adding 4.4 parts of 3-mercapto-1,2-propanediol, 0.2 part of 2,2′-azobisisobutyronitrile is divided into 20 times. Every 30 minutes, the reaction was continued for 12 hours at 80 ° C., and it was confirmed that 95% had reacted by solid content measurement. Next, 7.1 parts of pyromellitic dianhydride, 90 parts of propylene glycol monomethyl ether acetate, and 0.40 part of 1,8-diazabicyclo- [5.4.0] -7-undecene as a catalyst were added. The reaction was carried out at 2 ° C. for 2 hours and at 80 ° C. for 5 hours, and it was confirmed by titration that 90% or more of the acid anhydride had been half-esterified. Sampling 2 g of resin solution, heating and drying at 180 ° C. for 20 minutes, measuring the nonvolatile content, adding propylene glycol monomethyl ether acetate so that the nonvolatile content becomes 40% by weight, acid value per solid content of 18 mg KOH / g, A dispersant (A-1) having an aromatic carboxyl group having a number average molecular weight of 10,000 was obtained.

<Production Examples 2 and 3 of dispersant of dispersant (A) having aromatic carboxyl group>
Hereinafter, using the materials shown in Table 1, Dispersants (A-2) and (A-3) were obtained in the same manner as Dispersant (A-1).

<Production Example 4 of Vinyl Resin (B) Having Tertiary Amino Group>
A reaction vessel equipped with a gas introduction tube, a condenser, a stirring blade, and a thermometer was charged with 133 parts of propylene glycol monomethyl ether acetate and heated to 100 ° C. while purging with nitrogen. The dropping tank is charged with 180 parts of N, N-dimethylaminoethyl methacrylate, 20 parts of 2-hydroxyethyl methacrylate, 61 parts of propylene glycol monomethyl ether acetate and 6 parts of 2,2′-azobis (2,4-dimethylvaleronitrile). After stirring until uniform, it was added dropwise to the reaction vessel over 2 hours, and then the reaction was continued for 3 hours at the same temperature to obtain a vinyl resin solution having a tertiary amino group. After cooling to room temperature, about 2 g of the resin solution was sampled and heated and dried at 180 ° C. for 20 minutes to measure the nonvolatile content. Propylene glycol monomethyl ether so that the nonvolatile content was 40% by weight in the previously synthesized resin solution. Acetate was added to obtain a vinyl resin (B-1) solution having a tertiary amino group having an amine value per solid content of 315 mgKOH / g and a number average molecular weight of 3000.

<Example 5 of production of binder resin (F)>
Place 370 parts of propylene glycol monomethyl ether acetate in a reaction vessel and heat to 80 ° C. while injecting nitrogen gas into the vessel. At the same temperature, 12.3 parts of methacrylic acid, 49.2 parts of benzyl methacrylate, paracumylphenol ethylene A mixture of 24.2 parts of oxide-modified acrylate (“Aronix M-110” manufactured by Toagosei Co., Ltd.) and 14.3 parts of 2-hydroxyethyl methacrylate was added dropwise over 1 hour to conduct a polymerization reaction. After completion of the dropwise addition, the mixture was further reacted at 80 ° C. for 3 hours, then 1.0 part of azobisisobutyronitrile dissolved in 50 parts of propylene glycol monomethyl ether acetate was added, and the reaction was further performed at 80 ° C. for 1 hour. Subsequently, an acrylic resin solution was obtained. The weight average molecular weight of the acrylic resin was about 30000. After cooling to room temperature, about 2 g of the resin solution was sampled and heated and dried at 180 ° C. for 20 minutes to measure the nonvolatile content. Propylene glycol monomethyl ether so that the nonvolatile content was 40% by weight in the previously synthesized resin solution. Acetate was added to prepare an acrylic resin (F-1) solution.

[Preparation of coloring composition (pigment dispersion) for color filter]
(Pigment dispersion 1)
Pigment (CI Pigment Green 58) 12.0 parts, binder resin (F-1) solution 22.4 parts synthesized in Production Example 5, organic solvent (propylene glycol monomethyl ether acetate) 56.0 parts, Production Example A mixture of 7.68 parts of the dispersant (A-1) solution synthesized in 1 and 1.92 parts of the vinyl resin (B-1) solution having a tertiary amino group synthesized in Production Example 4 was stirred and mixed uniformly. Then, using a zirconia bead having a diameter of 0.5 mm, it was dispersed for 5 hours in an Eiger mill (“Mini Model M-250 MKII” manufactured by Eiger Japan), and then 5.0 μm.
The pigment dispersion 1 was produced by filtering with a filter.

  Hereinafter, pigment dispersions 2 to 20 were obtained in the same manner as pigment dispersion 1 except that the materials and blending ratios shown in Table 2 were used.

  Abbreviations in Table 2 are as follows.

PG58: Pigment Green 58 zinc halide phthalocyanine green pigment, amine adsorption amount 550 μmol / g
PY150: Pigment Yellow 150: Azomethine yellow pigment,
Amine adsorption amount 130μmol /
Dispersant (A) A-1 to A-3: Dispersant (A) solution produced in Production Examples 1 to 3 Vinyl resin (B) B-1: A tertiary amino group produced in Production Example 4 Vinyl-based resin (B) solution Commercially available dispersants BYK161, 163, 2000, and 2001: Dispersants manufactured by Big Chemie Japan Disperbyk161, 163, 2000, and 2001 solutions Commercially available dispersants SP32500 and SP76500: Nippon Lubricol Dispersant: Solsperse 32500 and Solsperse 76500 Solution-Solvent PGMAC: Propylene glycol monomethyl ether acetate-Solvent EEP: Ethyl ethoxypropionate

(Coloring composition for color filter 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 type color composition 1 for color filters.
Pigment dispersion 1 40.0 parts Binder resin (F) solution 25.0 parts Active energy ray polymerizable monomer ("M402" manufactured by Toa Gosei Co., Ltd.) 1.5 parts Active energy ray polymerization initiator ( IRGACURE OXE 02) manufactured by Ciba Specialty Chemicals Co., Ltd. 0.2 parts Sensitizer ("EAB-F" manufactured by Hodogaya Chemical Co., Ltd.) 0.1 parts Organic solvent 33.2 parts propylene glycol monomethyl ether acetate

  Hereinafter, coloring compositions 2 to 20 for color filters were obtained in the same manner as in the coloring composition 1 for color filters except that the pigment dispersion and the active energy ray polymerization initiator shown in Table 3 were used. .

表３中の略称は以下の通りである。

Abbreviations in Table 3 are as follows.

Active energy ray polymerization initiator OXE01: radical photopolymerization initiator IRGACURE OXE01 manufactured by Ciba Japan 1,2-octadione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)]
Active energy ray polymerization initiator OXE02: radical photopolymerization initiator IRGACURE OXE02 manufactured by Ciba Japan, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1 -(0-acetyloxime)

<Measurement of viscosity characteristics>
The viscosity of the coloring composition for a color filter was measured using an E-type viscometer (“ELD viscometer” manufactured by Toki Sangyo Co., Ltd.) at a rotation speed of 20 rpm. Furthermore, the ratio of the viscosity at the number of revolutions of 6 rpm and 60 rpm (called thixo index, the larger the value, the higher the thixotropic property) was obtained, and the thixotropic property was evaluated.

<Measurement of viscosity stability>
Using an E-type viscometer (“ELD type viscometer” manufactured by Toki Sangyo Co., Ltd.), the initial viscosity of the next day after the preparation of the photosensitive coloring composition and the time-lapse viscosity accelerated at 40 ° C. for 1 week is 25 ° C. The measurement was performed under the condition of a rotational speed of 20 rpm. The thickening rate from the initial viscosity to the viscosity with time was calculated by the following formula.
[Thickening rate] = [viscosity with time] / [initial viscosity] × 100

(Production of color filter)
Using a spin coater for the coloring compositions 1 to 16 for the color filter, the chromaticity y in the CIE color system in the case of a green pigment on a 10 cm × 10 cm glass substrate is 0.6, and the chromaticity in the case of a yellow pigment. A coated substrate was prepared so that x was 0.45. After coating, the coated substrate was dried at 80 ° C. for 30 minutes in a hot air oven to obtain each color filter.

  Using the color filters thus obtained, the brightness, contrast ratio, and exposure sensitivity were measured as follows. The results are shown in Table 4.

<Measurement of brightness>
The brightness was measured using a microspectrophotometer (“OSP-SP100” manufactured by Olympus Optical Co., Ltd.).

<Measurement of contrast ratio>
A method for measuring the contrast ratio will be described with reference to FIG.

The light emitted from the backlight unit for liquid crystal display (7) passes through the polarizing plate (6), is polarized, and is applied onto the glass substrate (5). ) To reach the polarizing plate (3). If the polarization planes of the polarizing plate (6) and the polarizing plate (3) are parallel, light is transmitted through the polarizing plate (3), but if the polarization plane is perpendicular, the light is transmitted by the polarizing plate (3). Blocked. However, when light polarized by the polarizing plate (6) passes through the dried coating film (4) of the color filter coloring composition, scattering or the like by pigment particles occurs, resulting in a deviation in part of the polarization plane. When the polarizing plate is parallel, the amount of light transmitted through the polarizing plate (3) is reduced, and when the deflecting plate is perpendicular, a part of the light is transmitted through the polarizing plate (3). This transmitted light was measured as the luminance on the polarizing plate, and the ratio (contrast ratio) between the luminance when the polarizing plate was parallel and the luminance when it was orthogonal was calculated.
(Contrast ratio) = (Luminance when parallel) / (Luminance when direct)

  Therefore, when scattering occurs due to the pigment of the dried coating film (4) of the color filter coloring composition, the luminance when parallel is reduced and the luminance when orthogonal is increased, and the contrast ratio is lowered.

  A color luminance meter (“BM-5A” manufactured by Topcon Corporation) was used as the luminance meter (1), and a polarizing plate (“NPF-G1220DUN” manufactured by Nitto Denko Corporation) was used as the polarizing plate. In the measurement, a black mask (2) having a 1 cm square hole was applied to the measurement portion in order to block unnecessary light.

<Measurement of exposure sensitivity>
Exposure, development, and residue removal are performed using an exposure mask having a pattern width of 25 μm (the actual width of the transparent portion is 25 μm), and the line width of the obtained image is 25 μm by monitoring with an optical microscope with a dimension measuring function. The exposure amount (mJ / cm ² ) was measured. That is, the coloring composition for a color filter with a small amount of exposure shows high sensitivity because an image can be formed with a low amount of exposure.

  Dispersant (A) obtained by reacting an acidic pigment with a hydroxyl group of a vinyl polymer having a hydroxyl group at one terminal region and an acid anhydride group of an aromatic tetracarboxylic dianhydride, a vinyl having a tertiary amino group Coloring composition for color filter comprising an organic resin (B), an organic solvent (C), an active energy ray polymerizable monomer (D), an active energy ray polymerization initiator (E), and a binder resin (F) The coloring compositions for color filters 1 to 5 and 11 to 15 of Examples 1 to 10, which are products, obtained good results in any of the evaluated characteristics.

  In particular, the ratio <b> / <a> of the number of moles <a> of the aromatic carboxyl group in the dispersant (A) and the number of moles <b> of the tertiary amino group in the vinyl resin (B) The colored compositions 1 to 4 and 11 to 14 for color filters of Examples 1 to 4 and Examples 6 to 9 within the range of 1.1 to 5.0 have low viscosity and excellent stability. It was.

  The color filter coloring compositions 7 to 9 and 16 to 20 in Comparative Examples 2 to 4 and 6 to 10 are only one of the dispersant (A) and the vinyl resin (B) having a tertiary amino group. Because it does not contain both or both, the viscosity exceeds 100 mPa · s (20 rpm), the viscosity increase rate is mostly around 200%, and the thixo index exceeds 2.0, which is the target A color filter with a uniform film thickness could not be obtained. Moreover, although there was no problem in the viscosity characteristics (viscosity, thixo index, thickening rate) of the coloring compositions 6 and 10 for the color filters of Comparative Examples 1 and 5, the contrast was about 1000 to 2500, which was not good compared to the Examples. It was.

Claims (4)

Pigments containing acidic pigments,
Dispersant (A) formed by reacting a hydroxyl group of a vinyl polymer having a hydroxyl group at one end region with an acid anhydride group of an aromatic tetracarboxylic dianhydride,
Vinyl resin (B) having a tertiary amino group,
Organic solvent (C),
Active energy ray polymerizable monomer (D),
Active energy ray polymerization initiator (E), and
Binder resin (F),
Ri Na contain, further comprising moles <a> aromatic carboxyl group in the dispersant (A), the number of moles of tertiary amino group in the vinyl resin (B) having a tertiary amino group < The coloring composition for a color filter , wherein the ratio <b> / <a> to b> is 1.1 to 5.0 . The coloring composition for a color filter according to claim 1, wherein the amine adsorption capacity of the acidic pigment is 50 μmol / g or more and 700 μmol / g or less. The organic solvent (C) is cyclohexyl acetate, propylene glycol diacetate, diethylene glycol diethyl ether, ethyl 3-ethoxypropionate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, ethylene glycol monomethyl ether acetate, and d Ji glycol mono The coloring composition for a color filter according to claim 1 or 2, which is one or more solvents selected from the group consisting of ethyl ether acetate. Color filter characterized by comprising a filter segment formed from claims 1-3 for a color filter coloring composition according to any one.

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