Organic pigment composition for color filters, method for producing the same, and color filter

Patent metadata

Field	Value
Publication number	US-9908991-B2
Application number	US-201314115291-A
Country	US
Kind code	B2
Filing date	May 16, 2013
Priority date	Jun 8, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

An organic pigment composition that allows a colored item to have good color saturation and high resistance to a change in hue even when subjected to a thermal history for a prolonged period. A color filter includes an organic pigment composition for color filters in a pixel portion. The organic pigment composition for color filters includes an organic pigment (A) having an average primary particle size of 100 nm or less; and a copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group, the amount of a nonvolatile component of the copolymer (B) being 0.1 to 15 parts relative to 100 parts of the organic pigment (A) on a mass basis.

First claim

The invention claimed is:

1. A color filter, comprising a pixel portion,
the pixel portion comprising a photosensitive composition comprising an organic pigment (A) having an average primary particle size of 100 nm or less; and a copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group, the amount of a nonvolatile component of the copolymer (B) being 0.1 to 15 parts relative to 100 parts of the organic pigment (A) on a mass basis.

2. The color filters according to claim 1 , wherein the organic pigment (A) is C.I. Pigment Green 58.

3. A method for producing the color filter according to claim 1 , the method comprising, in a liquid medium, heating under pressure the organic pigment (A) in the presence of a nonvolatile component of a copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group; or solvent-salt-milling the organic pigment (A) in the presence of the nonvolatile component of the copolymer (B) of a (meth)acrylic acid ester having a phosphate group and another (meth)acrylic acid ester having no phosphate group.

4. The method for producing the color filters according to claim 3 , wherein the organic pigment (A) is C.I. Pigment Green 58.

5. A color filter comprising a pixel portion, the pixel portion comprising a photosensitive composition comprising an organic pigment composition, the organic pigment composition being produced by the method according to claim 3 .

6. The color filter according to claim 1 , wherein the copolymer (B) is a copolymer having a glass-transition temperature of at least 0° C. and no more than 150° C.

7. The color filter according to claim 1 , wherein a monomer having a phosphate group in the copolymer (B) is in an amount of at least 3% and no more than 35% by mass based on 100% of all the monomers of copolymer (B).

8. The color filter according to claim 1 , wherein the organic pigment is selected from the group consisting of diketopyrrolopyrrole pigments; azo pigments; phthalocyanine pigments; anthraquinone pigments; quinacridone pigments; dioxazine pigments; perinone pigments; perylene pigments; thioindigo pigments; isoindoline pigments; isoindolinone pigments; quinophthalone pigments and threne pigments.

9. The color filter according to claim 1 , wherein the photosensitive composition further includes a photosensitive resin.

10. The color filter according to claim 9 , wherein the photosensitive resin is selected from the group consisting of urethane resin, an acrylic resin, a polyamic acid resin, a polyimide resin, a styrene-maleic resin, a styrene-maleic anhydride resin and photopolymerizable monomers.

11. A liquid crystal display comprising the color filter according to claim 1 .

Assignees

• Dainippon Ink & Chemicals

Inventors

• Fujimaki Masanori
• Tokuoka Mayumi
• Kimura Akira
• Shimada Katsunori
• Fukushima Kayoko
• Takahashi Masaharu

Classifications

• C09B67/0002

  Grinding; Milling with solid grinding or milling assistants · CPC title

• G02B5/223

  containing organic substances, e.g. dyes, inks or pigments · CPC title

• G02B5/201

  in the form of arrays · CPC title

• C08K5/3417 Primary

  condensed with carbocyclic rings · CPC title

• G03F7/105

  having substances, e.g. indicators, for forming visible images · CPC title