JP7009176B2 - Blue pigment dispersion composition for color filters - Google Patents

Description

The present invention relates to a blue pigment dispersion composition for a color filter used for forming a color filter of a color display device.

In recent years, most display devices such as televisions, computers, and mobile phones have come to be occupied by liquid crystal color display devices. A color filter used in a liquid crystal color display device is generally a transparent substrate, a colored layer formed on the transparent substrate and composed of three primary color coloring patterns of a red pixel portion, a green pixel portion, and a blue pixel portion, and each coloring. It has a light-shielding portion (black matrix) formed on a transparent substrate so as to partition the pattern. These red pixel portions, green pixel portions, and blue pixel portions have a structure in which a synthetic resin film in which an organic pigment having good heat resistance and light resistance is dispersed is provided on a substrate, and the organic pigment is red. , Green and blue organic pigments are used.

As the backlight in this liquid crystal color display device, there are a type using a cold cathode tube, a type using an LCD, a type using a white organic EL element, and the like. In addition, standardization organizations in each country will adopt the RGBW color standard (BT.2020) for such display devices, and among display devices using LCDs, 4K8K TVs will be supported. A color filter that supports the expansion of Color Gamut according to the new standard is desired. Further, even in the case of blue color (B), there is a possibility that the conventional blue composition for a color filter cannot sufficiently cope with it.

Even if a composition for a color filter in which a blue pigment and a purple pigment are used in combination as described in Patent Document 1 is used, the compatibility with the display device in the new standard obtains sufficient coloring power and high brightness. It cannot be done and is insufficient.

Japanese Unexamined Patent Publication No. 2013-148872

An object of the present invention is to provide a blue pigment dispersion composition for a color filter having high coloring power and high brightness that can be used for a color filter of a display device in accordance with the new standard.

As a result of diligent studies to solve the above problems, the present inventors have obtained C.I. I. Pigment Blue 15: 6 and zinc phthalocyanine-based green pigment are used, and by using a pigment dispersion aid and a resin in combination, it can be used as a color filter for an LCD light source or a display device equipped with a white organic EL light source. We have found that a blue pigment dispersion composition for a color filter having coloring power and high brightness and a suitable bluish hue can be obtained, and have completed the present invention.

That is, the present invention
(1) A blue pigment dispersion composition for a color filter mainly composed of a coloring pigment, a pigment dispersion aid, a resin, and an organic solvent, wherein the coloring pigment is C.I. I. A blue pigment dispersion composition for a color filter of a display device, which comprises Pigment Blue 15: 6 and a zinc phthalocyanine-based green pigment.
(2) The blue pigment dispersion composition for a color filter of the display device according to (1), which contains an alkali-soluble resin and a photopolymerizable compound as the resin.
(3) The above-mentioned C.I. I. The mass ratio of Pigment Blue 15: 6 to the zinc phthalocyanine-based green pigment is 99.9: 0.1 to 90.0: 10.0 for the color filter of the display device according to (1) or (2). Blue pigment dispersion composition.
(4) Zinc phthalocyanine-based green pigment is C.I. I. Pigment Green 59 and C.I. I. The blue pigment dispersion composition for a color filter of the display device according to any one of (1) to (3), which is one or more of Pigment Green 58.
(5) A blue pigment dispersion resist composition for a color filter mainly composed of a coloring pigment, a pigment dispersion aid, a resin, a photopolymerizable compound and an organic solvent, wherein the coloring pigment is C.I. I. A blue pigment-dispersed resist composition for a color filter of a display device, which comprises Pigment Blue 15: 6 and a zinc phthalocyanine-based green pigment.
(6) The blue pigment-dispersed resist composition for a color filter of the display device according to (5), which contains an alkali-soluble resin and a photopolymerizable compound as the resin.
(7) The above-mentioned C.I. I. The color filter of the display device according to (5) or (6), wherein the mass ratio of Pigment Blue 15: 6 to the zinc phthalocyanine-based green pigment is 99.9: 0.1 to 90.0: 10.0. Blue pigment dispersion resist composition.
(8) Zinc phthalocyanine-based green pigment is C.I. I. Pigment Green 59 and C.I. I. The blue pigment dispersion resist composition for a color filter of the display device according to any one of (5) to (7), which is one or more of Pigment Green 58.

According to the present invention, it is possible to obtain a blue pigment dispersion composition for a color filter, which has high coloring power and high brightness and is also excellent in dispersion stability.
Hereinafter, the blue pigment dispersion composition for a color filter of the display device of the present invention will be specifically described for each component thereof.

The present invention relates to a blue pigment dispersion composition for a color filter of a display device and a blue pigment dispersion resist composition for a color filter, and the blue pigment dispersion composition for a color filter may be a composition other than a resist. ..
In any case, the blue pigment dispersion composition for a color filter of the display device of the present invention is a composition used for the color filter of the display device, and as an effect of the present invention, high coloring power and high brightness are exhibited. It is possible to provide a blue pigment dispersion composition for a color filter and a blue pigment dispersion resist composition for a color filter of a display device.
The present invention relates to a blue pigment dispersion composition for a color filter and a blue pigment dispersion resist composition for a color filter obtained by blending an alkali-soluble resin, a photopolymerizable compound, or the like with the blue pigment dispersion composition for a color filter. be.
The blue pigment dispersion composition for a color filter includes a photocurable type and a non-photocurable type.

[A. Composition of blue pigment dispersion composition for color filter]
The blue pigment dispersion composition for a color filter of the present invention is mainly composed of a coloring pigment, a pigment dispersion aid, a resin, and an organic solvent, and may contain a pigment dispersant.

(Pigment)
The blue pigment dispersion composition for a color filter of the display device of the present invention comprises C.I. I. It contains Pigment Blue 15: 6 (CI PB 15: 6) and a zinc phthalocyanine-based green pigment.
The zinc phthalocyanine-based green pigment is a pigment containing a compound having a phthalocyanine structure having zinc as the central metal. In addition, C.I. I. As long as the effect of the present invention can be exhibited in cooperation with Pigment Blue 15: 6, a pigment composed of a compound having a phthalocyanine structure having zinc as a central metal and another pigment may be used.
Examples of the zinc phthalocyanine-based green pigment include C.I. I. Pigment Green 59 (CI PG59) and C.I. I. One or more of Pigment Green 58 (CI PG58) can be used. When a pigment which is a compound having a zinc phthalocyanine structure is added, the brightness or a film of the composition is formed when the blue pigment dispersion composition for a color filter and the blue pigment dispersion resist composition for a color filter of a display device are obtained. It is possible to improve the brightness and transmittance when the color is applied.
In the blue pigment dispersion composition for a color filter of a display device or the like provided with the white organic EL light source of the present invention, the total amount of the coloring pigment used is a mass ratio with respect to the total solid content of the composition, preferably 5 to 80. It is by mass, more preferably 20 to 50% by mass.

In order to impart high brightness and contrast to the blue pigment dispersion composition for a color filter of the display device of the present invention, it is preferable to use a finely divided pigment as each of the above coloring pigments. By performing the fine particle processing, the primary particle size of the coloring pigment can be made finer and more uniform.
The finely divided treatment includes, for example, an untreated coloring pigment, a water-soluble inorganic salt (sodium chloride, barium chloride, potassium chloride, etc., preferably sodium chloride, etc., and the average particle size of the water-soluble inorganic salt used. (Preferably 50 μm or less), and a mixture containing a water-soluble dispersion medium (alkoxyalcohols, glycols, ethers, etc.) that does not substantially dissolve the above-mentioned water-soluble inorganic salt can be used in a kneader, roll mill, or ball mill. , Attritor, Sandmill, Trimix (trade name) manufactured by Inoue Seisakusho Co., Ltd., which is a planetary mixer described in JP-A-2006-192385, and Asada Iron Works Co., Ltd., which is a continuous uniaxial kneader. After kneading with a kneading device such as Miracle KCK, it is preferable to perform salt milling to remove the water-soluble inorganic salt and the water-soluble dispersion medium, and perform a fine particle treatment.
Further, from the viewpoint that the crystal growth of the coloring pigment can be suppressed and the fine particles can be uniformly refined, it is preferable to carry out the fine particle processing in the presence of the pigment dispersion aid described later. The amount of the pigment dispersion aid used at that time is 0.5 to 30 parts by mass, preferably 3 to 10 parts by mass with respect to 100 parts by mass of the colored pigment.

In addition, C.I. I. In addition to Pigment Blue 15: 6, for example, C.I. I. Pigment Blue 15: 3 (CI PB 15: 3), C.I. I. A known blue pigment such as Pigment Blue 16 (CIPB16) can be used in combination. Further, as a green pigment, in a range that does not impair the effect of the present invention, and in a range that does not reduce the brightness and contrast, for example, C.I. I. Pigment Green 7 (CIPG7), C.I. I. Pigment Green 36 (CI PG36) or the like can be used.
However, it is better not to use violet pigments together.

(Pigment dispersion aid)
Examples of the pigment dispersion aid used in the blue pigment dispersion composition for a color filter of the display device of the present invention include C.I. I. Pigment Blue 15: 6 (ε copper phthalocyanine pigment) has the same or similar molecular structure as the basic skeleton, and an acid group that enhances the affinity with organic solvents is introduced into the basic skeleton to obtain a pigment dispersant having an acid group. Suitable. In such a pigment dispersion aid, in the process of atomizing and dispersing the pigment, the basic skeleton is adsorbed on the surface of the pigment, and the acid group enhances the affinity with the organic solvent and the pigment dispersant to disperse the pigment. It has the effect of improving the fineness of time and the stability of dispersion over time after dispersion. Further, it is more preferable that the pigment dispersion aid itself is dissolved in an organic solvent or dispersed in fine particles because it can be adsorbed over a wider range on the pigment surface.
Among them, good results can be obtained by using a pigment dispersion aid having a sulfonic acid group as an acid group.
In the blue pigment dispersion composition for a color filter of the display device of the present invention, the amount of the pigment dispersion aid having an acid group used is 0.5 to 30 parts by mass with respect to 100 parts by mass of the coloring pigment. If the content of the pigment dispersion aid having an acid group is less than 0.5 parts by mass, the pigment dispersion effect is lowered, while if it exceeds 30 parts by mass, the pigment dispersion effect is not further improved.

The pigment dispersion aid having an acid group is
(1) When a coloring pigment that has been finely divided in the absence of a pigment dispersion aid having an acid group is used, it has an acid group with respect to 100 parts by mass of the coloring pigment when the coloring pigment that has been finely divided is dispersed. 0.5 to 30 parts by mass, preferably 3 to 15 parts by mass, of the pigment dispersion aid is used.
(2) When a coloring pigment that has been finely divided in the presence of a pigment dispersion aid having an acid group is used, 0.5 parts of the pigment dispersion aid is added to 100 parts by mass of the coloring pigment during the fine particle treatment of the coloring pigment. Use up to 30 parts by mass, preferably 3 to 15 parts by mass, and use 0 to 29.5 parts by mass of a pigment dispersion aid having an acid group with respect to 100 parts by mass of the colored pigment when dispersing the finely divided colored pigment. , Preferably 0-12 parts by mass.
The total amount of the pigment dispersion aid having an acid group used in the fine particle treatment and the pigment dispersion aid having an acid group used in the pigment dispersion of the finely divided coloring pigment is 100. The pigment dispersion aid having an acid group is 0.5 to 30 parts by mass, preferably 3 to 15 parts by mass with respect to parts by mass.
More specifically, a case where a pigment dispersion aid having a sulfonic acid group is used as the pigment dispersion aid having an acid group will be described.
As a blue pigment, C.I. I. When the Pigment Blue 15: 6 is dispersed, as described above, the ε copper phthalocyanine pigment C.I. I. A pigment having an anthraquinone skeleton having the same skeleton as Pigment Blue 15: 6 and / or a sulfonated dye is used as a pigment dispersion aid.

(Polymer pigment dispersant)
A polymer pigment dispersant can be added to the blue pigment dispersion composition for a color filter of the display device of the present invention. As such a polymer pigment dispersant, a polymer pigment dispersant having a basic group conventionally used in the field of color filters can be used.
In the blue pigment dispersion composition for a color filter of the display device of the present invention, the amount used when using the polymer pigment dispersant is preferably 1 to 100 parts by mass with respect to 100 parts by mass of the coloring pigment. It is preferably 1 to 60 parts by mass. If the content of the polymer pigment dispersant is less than 1 part by mass, the pigment dispersion effect may be lowered, while if it exceeds 100 parts by mass, the developability may be lowered.

Examples of the polymer pigment dispersant having a basic group include the following.
(1) Polyamines, polyamides and polyesteramides having an amino group and / or an imino group of a polyamine compound (for example, poly (lower) alkyleneamine such as polyallylamine, polyvinylamine, polyethylenepolyimine, etc.) and a free carboxyl group. A reaction product with at least one selected from the group consisting of.
(2) A carbodiimide-based compound having at least one side chain selected from the group consisting of a polyester side chain, a polyether side chain, and a polyacrylic side chain and at least one basic nitrogen-containing group in the molecule. ..
(3) A reaction product of a low molecular weight amino compound such as poly (lower) alkyleneimine or methylimiminobispropylamine and a polyester having a free carboxyl group.
(4) Alcohols such as methoxyethylene glycol and polyesters having one hydroxyl group such as caprolactone polyester, compounds having 2 to 3 isocyanate group reactive functional groups, and isocyanate group reactivity in the isocyanate group of the polyisocyanate compound. A reaction product obtained by sequentially reacting an aliphatic or heterocyclic hydrocarbon compound having a functional group and a tertiary amino group.
(5) A reaction product obtained by reacting a polyisocyanate compound with a hydrocarbon compound having an amino group with a polymer of an acrylate having an alcoholic hydroxyl group.
(6) A reaction product obtained by adding a polyether chain to a small molecule amino compound.
(7) A reaction product obtained by reacting a compound having an isocyanate group with a compound having an amino group.
(8) A reaction product obtained by reacting a polyepoxy compound with a linear polymer having a free carboxyl group and an organic amine compound having one secondary amino group.
(9) A reaction product of a polycarbonate compound having a functional group capable of reacting with an amino group at one end and a polyamine compound.
(10) Selected from methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, stearyl methacrylate, benzyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, stearyl acrylate, and benzyl acrylate, or acrylic acid esters. At least one of the basic group-containing polymerizable monomers such as acrylamide, methacrylicamide, N-methylolamide, vinyl imidazole, vinylpyridine, and a monomer having an amino group and a polycaprolactone skeleton, and a styrene and a styrene derivative. , A copolymer with at least one of the other polymerizable monomers.
(11) An acrylic block copolymer or the like composed of a block having a basic group such as a tertiary amino group and a quaternary ammonium base and a block having no basic functional group.
(12) A pigment dispersant obtained by carrying out a Michael addition reaction of a polycarbonate compound with polyallylamine.
(13) A carbodiimide-based compound having at least one polybutadiene chain and one basic nitrogen-containing group.
(14) A carbodiimide-based compound having at least one side chain having an amide group in the molecule and at least one basic nitrogen-containing group.
(15) A polyurethane compound having a structural unit having an ethylene oxide chain and a propylene oxide chain, and having an amino group quaternized by a quaternizing agent.
(16) Obtained by reacting the isocyanate group of an isocyanate compound having an isocyanurate ring in the molecule with the active hydrogen group of a compound having an active hydrogen group in the molecule and having a carbazole ring and / or an azobenzene skeleton. The carbazole ring with respect to the total of the isocyanate group derived from the isocyanate compound having an isocyanurate ring in the molecule of the compound, and the urethane bond and the urea bond generated by the reaction of the isocyanate group and the active hydrogen group. And compounds having an azobenzene skeleton of 15-85%. etc.

(resin)
The resin used for the blue pigment dispersion composition for a color filter of a display device or the like provided with the white organic EL light source of the present invention has a transmittance of 80% or more in the entire wavelength region of 400 to 700 nm in the visible light region, preferably 80% or more. 95% or more resin can be used. As these resins, thermosetting resins, thermoplastic resins, and alkali-soluble resins can be used.
Such a resin is a mass fraction with respect to the total solid content of the blue pigment dispersion composition for a color filter of a display device provided with a white organic EL light source, and is preferably 5 to 94 mass in terms of the total amount of the resin used. %, More preferably in the range of 20 to 50% by mass.
Examples of the thermosetting resin and thermoplastic resin include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, and polyurethane. Based resin, phenol resin, polyester resin, acrylic resin, alkid resin, styrene resin, polyamide resin, rubber resin, cyclized rubber, epoxy resin, celluloses, polybutadiene, polyimide resin, benzoguanamine resin, melamine resin, urea resin, etc. Can be mentioned.
In some cases, a photopolymerizable resin described later in the section of the blue pigment dispersion resist composition for a color filter of the display device may be blended.

(Alkali-soluble resin as resin)
An alkali-soluble resin can be blended in the blue pigment dispersion composition for a color filter of the display device of the present invention. Such a resin may act as a binder for pigments and be soluble in a developing solution, particularly preferably an alkaline developing solution, which is used in the developing process when producing a color filter. For example, the ones that have been conventionally used are not particularly limited, and those that have been conventionally used can be used. Of these, an alkali-soluble resin having a carboxyl group is preferable, and a copolymer of an ethylenically unsaturated monomer having one or more carboxyl groups and another copolymerizable ethylenically unsaturated monomer is particularly preferable. ..
Specifically, styrene, 2-hydroxyethyl acrylate, which can be copolymerized with an ethylenically unsaturated monomer having a carboxyl group such as acrylic acid and methacrylic acid and an ethylenically unsaturated monomer having a carboxyl group, 2 -Hydroxyethyl methacrylate, allyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, glycerol monoacrylate, glycerol methacrylate, N-phenylmaleimide, polystyrene macromonomer, polymethylmethacrylate macromonomer, carboepoxydiacrylate, etc. Examples thereof include a copolymer with at least one ethylenically unsaturated monomer selected from the group of monomers and oligomers.

The acid value of the alkali-soluble resin in the present invention is preferably 50 to 300 KOHmg / g from the viewpoint of development characteristics. In the present invention, the acid value is a theoretical acid value, which is a value calculated mathematically based on the ethylenically unsaturated monomer having a carboxyl group and its content.
The weight average molecular weight of the alkali-soluble resin in the present invention is usually preferably 1,000 to 100,000 from the viewpoint of development characteristics and solubility in an organic solvent. In the present invention, the weight average molecular weight of the alkali-soluble resin is the polystyrene-equivalent weight average molecular weight obtained based on GPC. In the present invention, Waters 2690 (manufactured by Waters) is used as the apparatus, and PLgel 5μ MIXED-D (manufactured by Polymer Laboratories) is used as the column.
The amount of the alkali-soluble resin used in the present invention is 1 to 300 parts by mass, preferably 10 to 200 parts by mass with respect to 100 parts by mass of the coloring pigment used. In this case, if the amount of the alkali-soluble resin used is less than 1 part by mass, the development characteristics may deteriorate. On the other hand, if it exceeds 300 parts by mass, the colorant concentration is relatively lowered, so that it may be difficult to achieve the target color density as a thin film.

(Barium sulfate)
In the blue pigment dispersion composition for a color filter of the present invention, barium sulfate having a primary particle diameter of 5 to 20 nm can be used in order to improve heat resistance (luminance).
The amount of barium sulfate used is in the range of 0 to 25 parts by mass, preferably 5 to 20 parts by mass with respect to 100 parts by mass of the coloring pigment.
The barium sulfate is used during or after the dispersion of the finely divided colored pigment.

(Organic solvent)
As the organic solvent used in the blue pigment dispersion composition for a color filter of the display device of the present invention, the organic solvent conventionally used in the field of liquid crystal color filter resist can be preferably used. Specifically, an ester-based organic solvent, an ether-based organic solvent, an ether ester-based organic solvent, a ketone-based organic solvent, and an aromatic hydrocarbon-based organic solvent having a boiling point of 100 to 220 ° C. at normal pressure (1.013 × 102 kPa). , Nitrogen-containing organic solvent, etc. When a large amount of an organic solvent having a boiling point of more than 220 ° C. is contained, the organic solvent is used when prebaking a blue pigment dispersion composition for a color filter or a coating film coated with the composition containing the composition. It does not evaporate sufficiently and remains in the dry coating film, which may reduce the heat resistance of the dry coating film. Further, if a large amount of an organic solvent having a boiling point of less than 100 ° C. is contained, it becomes difficult to apply the coating film evenly and uniformly, and there is a possibility that a coating film having excellent surface smoothness cannot be obtained.

Specific examples of the organic solvent used in the blue pigment dispersion composition for a color filter of the present invention include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, and diethylene glycol monomethyl ether. Ether-based organic solvents such as diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monobutyl ether, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, and diethylene glycol methyl ethyl ether; ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether Ether ester organic solvents such as acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate; ketone organic solvents such as methyl isobutyl ketone, cyclohexanone, 2-heptanone, δ-butyrolactone; 2- Methyl hydroxypropionate, ethyl 2-hydroxypropionate, ethyl 2-hydroxy-2-methylpropionate, 3-methyl-3-methoxybutylpropionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, 3 -Ester-based organic solvents such as methyl ethoxypropionate, ethyl 3-ethoxypropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, n-amyl acrylate; alcohol-based solvents such as methanol, ethanol, isopropyl alcohol and butanol; N-methylpyrrolidone. , N, N-dimethylformamide, N, N-dimethylacetamide and other nitrogen-containing organic solvents can be exemplified. These can be used alone or in admixture of two or more.
Among these organic solvents, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, cyclohexanone, 2 -Heptanone, ethyl 2-hydroxypropionate, 3-methyl-3-methoxybutylpropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, n-amyl acrylate and the like are preferable, and propylene glycol is more preferable. It is monomethyl ether acetate.

The blue pigment dispersion composition for a color filter of the display device of the present invention is mainly composed of a color pigment, a pigment dispersion aid, a resin and an organic solvent, and these components are, in total, a blue pigment dispersion for a color filter of the display device. It occupies 90 to 100% by mass in the composition. Furthermore, a polymer pigment dispersant can be added, and any of the above-mentioned polymer pigment dispersants can be adopted as such a polymer pigment dispersant.
Further, the blue pigment dispersion composition for a color filter of the display device of the present invention can also be used as a resist composition without having photocurability.

(Additives that can be added as needed)
Various additives such as a photopolymerization initiator, a thermal polymerization inhibitor, an ultraviolet absorber, and an antioxidant can be appropriately used depending on the method for producing a blue pigment dispersion composition for a color filter of a display device. Examples of the photopolymerization initiator include those described later.

(Method for Producing Blue Pigment Dispersion Composition for Color Filter of Display Device of the Present Invention)
A method for producing a blue pigment dispersion composition for a color filter of a display device using the above raw materials will be described. In the case of a blue pigment-dispersed resist composition for a color filter of a display device that is not photocurable, it is not necessary to add a photopolymerizable compound.
Therefore, first, as shown below, C.I. I. A pigment blue 15: 6-containing pigment dispersion composition and a zinc phthalocyanine-based green pigment dispersion composition are prepared.

C. I. Pigment Blue 15: 6-Containing Pigment Dispersion Composition Presence of a pigment dispersion aid having an acid group (preferably a pigment and / or a sulfonate of a pigment having an anthraquinone skeleton having the same skeleton as CI Pigment Blue 15: 6). C.I. I. A mixture is obtained consisting of Pigment Blue 15: 6, a resin, a polymer pigment dispersant if necessary, an organic solvent, barium sulfate if necessary, and other additives if necessary. The obtained mixture was kneaded and dispersed using various dispersers such as a roll mill, a kneader, a high-speed stirrer bead mill, a ball mill, a sand mill, an ultrasonic disperser, and a high-pressure disperser. I. Pigment Blue 15: 6-containing pigment dispersion composition is obtained.

Zinc Phthalocyanine-based Green Pigment Dispersion Composition Zinc that has been atomized in the presence or absence of a pigment dispersion aid having an acid group (preferably a sulfonate of a pigment having the same skeleton as the zinc phthalocyanine-based green pigment). Phthalocyanine-based green pigments, pigment dispersion aids (preferably sulfonates of pigments having the same skeleton as zinc phthalocyanine-based green pigments), resins, polymer pigment dispersants, organic solvents, barium sulfate, if necessary, further required. A mixture consisting of other additives is obtained depending on the above. The obtained mixture is kneaded and dispersed using various dispersers such as a roll mill, a kneader, a high-speed stirrer, a bead mill, a ball mill, a sand mill, an ultrasonic disperser, and a high-pressure disperser to disperse the zinc phthalocyanine-based green pigment dispersion composition. Get things.

The C.I. obtained as described above. I. Using the pigment blue 15: 6-containing pigment dispersion composition and the zinc phthalocyanine-based green pigment dispersion composition, a blue pigment dispersion composition for a color filter of a display device provided with a white organic EL light source is, for example, the following (1). It can be obtained by the production method of (2).
At that time, the following complementary color pigment-containing pigment dispersion composition may also be used in combination, if necessary.
Complementary Color Pigment-Containing Pigment Dispersion Composition: If necessary, the complementary color pigment is also a complementary color pigment that has been micronized in the presence or absence of a pigment dispersion aid having an acid group. I. Pigment Blue 15: 6-containing pigment dispersion composition is obtained in the same manner as the pigment dispersion composition.

(1) C.I. I. Pigment Blue 15: 6-containing pigment dispersion composition and zinc phthalocyanine-based green pigment dispersion composition are mixed, if necessary, in a predetermined ratio of complementary color pigments, and then, if necessary, resin and sulfate. Barium, an organic solvent, and other additives are added to produce a blue pigment dispersion composition for a color filter of a display device provided with the white organic EL light source of the present invention.
(2) C.I. I. Pigment Blue 15: 6-containing pigment dispersion composition is mixed with a complementary color pigment in a predetermined ratio as needed, and then a resin, barium sulfate, an organic solvent and other additives are added as needed. In addition, C.I. I. A blue pigment dispersion composition for a color filter containing Pigment Blue 15: 6 is produced, while a blue pigment dispersion composition for a color filter containing a zinc phthalocyanine-based green pigment is similarly produced for a zinc phthalocyanine-based green pigment dispersion composition. Then, through the step of mixing these, the blue pigment dispersion composition for a color filter of the present invention is produced.

C. obtained by the above method. I. Pigment Blue 15: 6-containing pigment dispersion composition and zinc phthalocyanine-based green pigment dispersion composition are added with a resin, barium sulfate, an organic solvent, and other additives as necessary to obtain a blue pigment dispersion composition for a color filter. Prepare.
Next, in the prepared blue pigment dispersion composition for a color filter, C.I. I. Pigment Blue 15: 6 and a complementary color pigment are mixed with a zinc phthalocyanine-based green pigment in a predetermined ratio to obtain a blue pigment dispersion composition for a color filter of a display device provided with the white organic EL light source of the present invention. ..

In the production methods (1) and (2) above, when a fine particle pigment that has been finely divided in the presence of a pigment dispersion aid having an acid group is used, a pigment having an acid group when the fine particle pigment is dispersed is used. It can be manufactured without containing a dispersion aid.
Further, in the above-mentioned production methods (1) and (2), the resin and barium sulfate can be added at the time of preparation of the pigment dispersion composition and / or after preparation of the pigment dispersion composition.
Further, among the above-mentioned production methods (1) and (2), a pigment that has been finely divided in the presence of a pigment dispersion aid having an acid group is used because high coloring power and high brightness can be obtained. Is preferable.

Currently, as a method for producing a color filter using a blue pigment-dispersed resist composition for a color filter, a photoresist method using a photocurable composition is mainly used, but thereafter, it will be used in the photoresist method. The components and the like contained in each of a photocurable blue pigment dispersion composition for a color filter and a non-photocurable blue pigment dispersion composition for a color filter will be described below.

The mass fraction of the blue pigment dispersion composition for a color filter such as a display device provided with a white organic EL light source is preferably 5 to 94% by mass, more preferably 20 by mass, based on the total amount of the resins used. It is in the range of ~ 50% by mass.

[B. When the blue pigment dispersion resist composition for the color filter of the display device is photocurable]
Next, a case where the blue pigment dispersion resist composition for a color filter of the display device of the present invention is photocurable will be described.
When the blue pigment-dispersed resist composition for a color filter of the display device of the present invention is photocurable, the composition is an active energy ray-curable resist composition that can be alkaline-developed, and is a pigment or pigment. It is mainly composed of a dispersion aid, a resin, and an organic solvent, contains barium sulfate, a photopolymerizable compound as the resin, and may further contain an alkali-soluble resin.
The types and amounts of pigments, pigment dispersion aids, polymer pigment dispersants, resins other than photopolymerizable compounds, barium sulfate and organic solvents are as described above for the blue pigment dispersion composition for color filters. do.

The organic solvent is 50% by mass or more in the blue pigment dispersion resist composition for a color filter of the display device of the present invention from the viewpoint of the solubility of the alkali-soluble resin, the dispersibility of the coloring pigment, the coatability, and the like. It is preferable that the content is 70% by mass or more, and it is more preferable that the content is 70% by mass or more.

(Photopolymerizable compound)
Examples of the photopolymerizable compound used in the blue pigment dispersion resist composition for a color filter of the display device of the present invention include a monomer having one or more photopolymerizable unsaturated bonds in the molecule, an oligomer, a photopolymerizable resin and the like. Then, the same one described in the above-mentioned blue pigment dispersion composition for a color filter is used. Monomers, oligomers, etc. having photopolymerizable unsaturated bonds are polymerized by the action of radicals and cations generated when the photopolymerization initiator described later is decomposed by active energy rays such as ultraviolet rays and electron beams. It has an unsaturated bond that can be polymerized.
As the photopolymerizable compound, examples of the monomer having one photopolymerizable unsaturated bond in the molecule include alkyl methacrylates or acrylates such as methyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate. Aralkyl methacrylates or acrylates such as benzyl methacrylate and benzyl acrylate; alkoxyalkyl methacrylates or acrylates such as butoxyethyl methacrylate and butoxyethyl acrylate; aminoalkyl methacrylates such as N, N-dimethylaminoethyl methacrylate and N, N-dimethylaminoethyl acrylate. Or acrylate; methacrylic acid ester or acrylic acid ester of polyalkylene glycol alkyl ether such as diethylene glycol ethyl ether, triethylene glycol butyl ether, dipropylene glycol methyl ether; methacrylic acid ester of polyalkylene glycol aryl ether such as hexaethylene glycol phenyl ether or Acrylic acid esters; isobonyl methacrylates or acrylates; glycerol methacrylates or acrylates; 2-hydroxyethyl methacrylates or acrylates and the like.
Examples of the monomer having two or more photopolymerizable unsaturated bonds as a photopolymerizable compound in the molecule include bisphenol A dimethacrylate, 1,4-butanediol dimethacrylate, 1,3-butylene glycol dimethacrylate, and diethylene glycol dimethacrylate. , Acrylate Dimethacrylate, Neopentyl Glycol Dimethacrylate, Polyethylene Glycol Dimethacrylate, Polypropylene Glycol Dimethacrylate, Tetraethylene Glycol Dimethacrylate, Trimethylol Propanetrimethacrylate, Pentaerythritol Trimethacrylate, Pentaerythritol Tetramethacrylate, Dipentaerythritol Tetramethacrylate, Di Pentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, bisphenol A diacrylate, 1,4-butanediol diacrylate, 1,3-butylene glycol diacrylate, diethylene glycol diacrylate, glycerol diacrylate, neopentyl glycol diacrylate, polyethylene glycol Diacrylate, polypropylene glycol diacrylate, tetraethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate and the like. Be done. These monomers can be used alone or in combination of two or more.
Further, an oligomer obtained by polymerizing a photopolymerizable compound can be used.
As the photopolymerizable resin as a photopolymerizable compound, a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group is passed through an isocyanate group, an aldehyde group, an epoxy group, or the like (meth). A resin having a photocrosslinkable group such as an acrylic compound or silicic acid is used. A linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or an α-olefin-maleic anhydride copolymer is half-estered with a (meth) acrylic compound having a hydroxyl group such as hydroxyalkyl (meth) acrylate. A modified polymer is also used.
The photopolymerizable compounds capable of forming these resins can be used alone or in combination of two or more. In the present invention, the amount of the photopolymerizable compound used is in the mass fraction, preferably in the range of 3 to 50% by mass, with respect to the total solid content in the blue pigment dispersion resist composition for a color filter of the display device.

(Photopolymerization initiator)
The photopolymerization initiator used in the blue pigment dispersion resist composition for a color filter of the display device of the present invention can generate radicals and cations by being irradiated with active energy rays such as ultraviolet rays and electron beams. It is not particularly limited as long as it is, for example, benzophenone, N, N'-tetraethyl-4,4'-diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, benzyl, 2,2-diethoxyacetophenone, benzoin. , Benzoin Methyl Ether, Benzoin Isobutyl Ether, benzyl Dimethyl Ketal, α-Hydroxyisobutylphenone, Thioxanthone, 2-Chlorothioxanthone, 1-Hydroxycyclohexylphenylketone, t-butylanthraquinone, 1-chloroanthraquinone, 2,3-dichloroanthraquinone, 3-Chlor-2-methylanthraquinone, 2-ethylanthraquinone, 1,4-naphthoquinone, 1,2-benzoanthraquinone, 1,4-dimethylanthraquinone, 2-phenylanthraquinone, 2-methyl-1 [4- (methylthio) Phenyl] -2-morpholinopropane-1-one, triazine-based photopolymerization initiators and the like can be mentioned. These photopolymerization initiators may be used alone or in combination of two or more.
In the present invention, the content of the photopolymerization initiator is a mass fraction with respect to the total solid content in the blue pigment dispersion resist composition for a color filter of the display device, preferably in the range of 1 to 20% by mass. be.

The blue pigment dispersion resist composition for a color filter of the display device of the present invention includes a coloring pigment, a pigment dispersion aid, a polymer pigment dispersant, an alkali-soluble resin, a photopolymerizable compound, a photopolymerization initiator, barium sulfate and an organic solvent. These components, in total, occupy 90-100% by mass in the blue pigment dispersion resist composition for color filters.

(Additives that can be added as needed)
When the blue pigment-dispersed resist composition for a color filter of the display device of the present invention is photocurable, various additives such as a thermal polymerization inhibitor, an ultraviolet absorber, and an antioxidant are appropriately added as necessary. Can be used.

[C. When the blue pigment dispersion resist composition for the color filter of the display device is not photocurable]
When the blue pigment dispersion resist composition for a color filter of the display device is not photocurable, the above B.I. The blue pigment dispersion resist composition for a color filter of a display device does not contain the photopolymerizable compound or photopolymerization initiator used when the photocurable is photocurable, and if necessary, further blue for the color filter of the above display device. A resin other than the photopolymerizable compound shown in the description of the composition of the pigment dispersion composition is blended.

(Additives that can be added as needed)
When the blue pigment-dispersed resist composition for a color filter of the display device of the present invention is not photocurable, various additives such as an ultraviolet absorber and an antioxidant can be appropriately used, if necessary.

(Method for Producing Blue Pigment Dispersed Resist Composition for Color Filter of Display Device of the Present Invention)
A method for producing a blue pigment-dispersed resist composition for a color filter of a display device using the above materials will be described. When the blue pigment dispersion resist composition for a color filter of a display device is photopolymerizable, the photopolymerizable compound and photopolymerization are further started with respect to the blue pigment dispersion composition for a color filter of the display device obtained above. An agent, if necessary, an alkali-soluble resin, barium sulfate, an organic solvent, and other additives are added to obtain a blue pigment-dispersed resist composition for a color filter of the display device of the present invention.
Further, when it is not photopolymerizable, any of an alkali-soluble resin, barium sulfate, an organic solvent, other additives and the like is further added to obtain a blue pigment-dispersed resist composition for a color filter of the display device of the present invention. Can be done. The same applies to the following manufacturing method.
Specifically, for example, it can be obtained by the following production methods (1) and (2).

(1) In advance, the above-mentioned C.I. I. Pigment Blue 15: 6-containing pigment dispersion composition and zinc phthalocyanine-based green pigment dispersion composition were obtained from C.I. I. Pigment Blue 15: 6 and zinc phthalocyanine-based green pigment and, if necessary, a complementary color pigment are mixed in a predetermined ratio, etc., to obtain a blue pigment dispersion composition for a color filter of a display device, if necessary. A photopolymerizable compound, a photopolymerization initiator, an alkali-soluble resin, barium sulfate, an organic solvent, other additives and the like are added to obtain a blue pigment-dispersed resist composition for a color filter of the display device of the present invention.

(2) The above C.I. I. Pigment Blue 15: 6-containing pigment dispersion composition and zinc phthalocyanine-based green pigment dispersion composition are each added with a polymerizable compound, a photopolymerization initiator, an alkali-soluble resin, barium sulfate, an organic solvent, and the like, if necessary. The agent is added to obtain a blue pigment dispersion resist composition for a color filter of a display device.
After that, a step of mixing the blue pigment-dispersed resist composition for a color filter of those display devices is performed to produce a blue pigment-dispersed resist composition for a color filter of the display device of the present invention.
In the blue pigment dispersion resist composition for a color filter of the display device obtained by the above methods (1) and (2), if necessary, a photopolymerizable compound, a photopolymerization initiator, and if necessary, an alkali-soluble substance. A pigment-dispersed resist composition for each color filter is prepared by adding a resin, barium sulfate, an organic solvent, and other additives. Next, the prepared pigment dispersion resist composition for a color filter was subjected to C.I. I. Pigment Blue 15: 6 and zinc phthalocyanine-based green pigment are mixed as necessary so that the complementary color pigment is in a predetermined ratio to obtain a blue pigment dispersion resist composition for a color filter of the display device of the present invention.
Further, as a method for manufacturing a color filter for a display device using the blue pigment dispersion composition for a color filter of the display device of the present invention, it is known as a configuration other than the pigment dispersion composition including the device necessary for the method. It can be manufactured by adopting the above means.
The blue pigment dispersion composition for a color filter having a specific composition of the present invention preferably has a chromaticity x of 0.125 to 0.135 as its color characteristics (x, y, Y). y is preferably 0.040 to 0.121, and particularly preferably 0.044 to 0.100.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, "%" means "% by mass" and "part" means "part by mass".

<Pigment dispersion aid>
Phthalocyanine derivative: DISPER BYK-2100 (manufactured by Big Chemie)
<Pigment dispersant>
LP21116: Acrylic polymer manufactured by Big Chemie, amine value 29, solid content 40% by mass
<Alkali-soluble resin>
ZAH110: manufactured by Soken Chemical Co., Ltd., acid value: 100 KOHmg / g, weight average molecular weight: about 15,000, solid content content 35% by mass
<Photopolymerizable compound>
DPHA: Dipentaerythritol hexaacrylate <organic solvent>
PGMEA: Propylene Glycol Monomethyl Ether Acetate PGME: Propylene Glycol Monomethyl Ether

A blue pigment dispersion composition for a color filter was obtained based on the formulations shown in Table 1 below.

<Blue pigment dispersion resist composition for color filters>
Each component of the above Examples and Comparative Examples was mixed so as to have the composition shown in Table 1, and this was kneaded with a paint conditioner using 0.2 mmΦ zirconia beads for 6 hours to obtain a blue pigment dispersion composition for a color filter. Got

Next, the blue pigment dispersion composition for a color filter shown in Table 1 and other materials are uniformly mixed using a high-speed stirrer so as to have the composition shown in Table 2, and then filtered through a membrane filter having a pore size of 3 μm to obtain a color filter. A blue pigment-dispersed resist composition for use was obtained.

(evaluation)
<Preparation of sample>
The blue pigment dispersion resist composition for a color filter of Examples and Comparative Examples was applied onto a glass substrate using a spin coater. Then, after pre-baking at 100 ° C. for 3 minutes, the mixture was exposed to a high-pressure mercury lamp and further post-baked at 230 ° C. for 30 minutes.

<Color characteristics / contrast>
For the above samples of Examples and Comparative Examples, the color characteristics (x, y, Y) of each resist were measured with a spectrophotometer (manufactured by Shimadzu Corporation, UV-2500PC, C light source 2 ° field). Luminance Y and contrast at chromaticity x = 0.1332, y = 0.120, x = 0.1330, y = 0.090, and x = 0.1337, y = 0.090, respectively, were determined.

<Film thickness> The film thickness was measured with a film thickness meter (KLA-Tencor Corporation, Surface Profiler Alpha-Step IQ) by cutting the coating film by about 5 mm with a cutter knife.

<Viscosity>
The viscosity at 25 ° C. was measured using an E-type viscometer (R100 type viscometer model RE100L manufactured by Toki Sangyo Co., Ltd.).

<Dispersion stability>
The blue pigment-dispersed resist composition for a color filter used in the resist methods of the above Examples and Comparative Examples was taken in a glass bottle, sealed tightly, and kept at 40 ° C., 5 ° C. and room temperature (23 ° C.) for 1 month. The state after storage was evaluated according to the following evaluation criteria.
◯: Viscosity change rate before and after storage is 10% or less ×: Viscosity change rate before and after storage is more than 10%

According to the above-mentioned Examples and Comparative Examples when the blue pigment dispersion resist composition for a color filter was prepared, the dispersion stability was good. And according to the example, it was possible to obtain higher brightness and contrast than in the comparative example.
In addition, although the components other than the pigment and the blending amount thereof are common to the examples and the comparative examples, the composition of the examples had a lower viscosity.

Claims (6)

A blue pigment dispersion composition for a color filter mainly composed of a coloring pigment, a pigment dispersion aid, a resin, and an organic solvent, wherein the coloring pigment is C.I. I. Pigment Blue 15: 6 and zinc phthalocyanine-based green pigment are contained , and the above-mentioned C.I. I. The mass ratio of Pigment Blue 15: 6 to the zinc phthalocyanine-based green pigment is Pigment Blue 15: 6: The zinc phthalocyanine-based green pigment = 99.9: 0.1 to 90.0: 10.0. A blue pigment dispersion composition for a color filter of a display device having a chromaticity x of the film of 0.125 to 0.135 and y of 0.040 to 0.121 (provided that it does not contain a purple colorant, and C.I. Contains 91.8 parts by mass of I. Pigment Blue 15: 6 and 8.2 parts by mass of CI Pigment Green 58, and does not contain resin having an epoxy group) . The blue pigment dispersion composition for a color filter of the display device according to claim 1, which contains an alkali-soluble resin and a photopolymerizable compound as the resin. Zinc phthalocyanine-based green pigment is C.I. I. Pigment Green 59 and C.I. I. The blue pigment dispersion composition for a color filter of the display device according to claim 1 or 2 , which is one or more of Pigment Green 58. A blue pigment dispersion resist composition for a color filter of a display device mainly composed of a coloring pigment, a pigment dispersion aid, a resin, a photopolymerizable compound and an organic solvent, wherein the coloring pigment is C.I. I. Pigment Blue 15: 6 and zinc phthalocyanine-based green pigment are contained, and the above- mentioned C.I. I. The mass ratio of Pigment Blue 15: 6 to the zinc phthalocyanine-based green pigment is C.I. I. Pigment Blue 15: 6: The zinc phthalocyanine green pigment = 99.9: 0.1 to 90.0: 10.0, the chromaticity x of the coating film is 0.125 to 0.135, and y is 0. .040 to 0.121, a blue pigment dispersion composition for a color filter of a display device (provided that it does not contain a purple colorant, and CI Pigment Blue 15: 6 is 91.8 parts by mass and CI. Does not contain 8.2 parts by mass of Pigment Green 58, and does not contain resin having an epoxy group)
A blue pigment dispersion resist composition for a color filter of a display device, including . The blue pigment dispersion resist composition for a color filter of the display device according to claim 4 , which contains an alkali-soluble resin as the resin. Zinc phthalocyanine-based green pigment is C.I. I. Pigment Green 59 and C.I. I. The blue pigment dispersion resist composition for a color filter of the display device according to claim 4 or 5 , which is one or more of Pigment Green 58.