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

Patent metadata

Field	Value
Publication number	US-10247863-B2
Application number	US-201615564892-A
Country	US
Kind code	B2
Filing date	Apr 5, 2016
Priority date	Apr 7, 2015
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Provided is an organic pigment composition for color filters, which can be used preferably for a color filter that allows to produce a liquid crystal display device which has excellent heat resistance, a brighter display screen, and accordingly higher brightness; a method for producing the same; and a color filter which includes the organic pigment composition for color filters. The color filter has higher heat resistance by using the organic pigment composition for color filters which includes a phthalocyanine pigment and a pigment derivative in which the ratio of a multi-substituted phthalimide alkyl group to the whole amount of the pigment derivative is limited.

First claim

The invention claimed is:

1. An organic pigment composition for color filters, comprising:
a phthalocyanine pigment (A); and
a pigment derivative (B) represented by General Formula (1):

wherein in General Formula (1), M represents a metal which may have a substituent or 2H, Z represents a phthalimide alkyl group which may have a substituent, n1, n2, n3, and n4 represent the number of the substituent Z and each independently is an integer of 0 to 4, provided that when N=n1+n2+n3+n4, a relation of 1≤N≤8 is satisfied, a sum of the strength ratio of pigment derivatives having an N of 3 to 8 in field desorption ionization mass spectrometry is 30% or less of a sum of the strength ratio of pigment derivatives having an N of 1 to 8, a strength ratio of pigment derivative of N=2 in field desorption ionization mass spectrometry is 20% or more of a sum of the strength ratio of pigment derivatives having an N of 1 to 8, and a strength ratio of pigment derivative of N=5 is 0.7% or more and less than 5.1% of a sum of the strength ratio of pigment derivatives having an N of 1 to 8.

2. The organic pigment composition for color filters according to claim 1 ,
wherein in General Formula (1), a sum of the strength ratio of pigment derivatives having an N of 4 to 8 in field desorption ionization mass spectrometry is 15% or less of a sum of the strength ratio of pigment derivatives having an N of 1 to 8.

3. A method for producing the organic pigment composition for color filters according to claim 2 comprising:
a step of performing solvent salt milling of a mixture which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent.

4. The method for producing the organic pigment composition for color filters according to claim 3 ,
wherein the mixture, which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent, further includes an acryl resin.

5. A color filter comprising:
the organic pigment composition for color filters obtained by the method for producing an organic pigment composition for color filters according to claim 3 .

6. A color filter comprising:
the organic pigment composition for color filters according to claim 2 .

7. The organic pigment composition for color filters according to claim 1 ,
wherein M in General Formula (1) represents a monovalent to tetravalent metal which may have a substituent.

8. A method for producing the organic pigment composition for color filters according to claim 7 comprising:
a step of performing solvent salt milling of a mixture which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent.

9. The method for producing the organic pigment composition for color filters according to claim 8 ,
wherein the mixture, which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent, further includes an acryl resin.

10. A color filter comprising:
the organic pigment composition for color filters obtained by the method for producing an organic pigment composition for color filters according to claim 8 .

11. A color filter comprising:
the organic pigment composition for color filters according to claim 7 .

12. The organic pigment composition for color filters according to claim 1 ,
wherein 0.1 parts to 50.0 parts of the pigment derivative (B) represented by General Formula (1) are included per 100 parts of the phthalocyanine pigment (A) by mass.

13. A method for producing the organic pigment composition for color filters according to claim 12 comprising:
a step of performing solvent salt milling of a mixture which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent.

14. The method for producing the organic pigment composition for color filters according to claim 13 ,
wherein the mixture, which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent, further includes an acryl resin.

15. A color filter comprising:
the organic pigment composition for color filters according to claim 12 .

16. A method for producing the organic pigment composition for color filters according to claim 1 comprising:
a step of performing solvent salt milling of a mixture which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent.

17. The method for producing the organic pigment composition for color filters according to claim 16 ,
wherein the mixture, which includes crude phthalocyanine or the phthalocyanine pigment (A), the pigment derivative (B) represented by General Formula (1), a water-soluble inorganic salt, and a water-soluble organic solvent, further includes an acryl resin.

18. A color filter comprising:
the organic pigment composition for color filters obtained by the method for producing an organic pigment composition for color filters according to claim 17 .

19. A color filter comprising:
the organic pigment composition for color filters according to claim 1 .

20. A color filter comprising:
the organic pigment composition for color filters obtained by the method for producing an organic pigment composition for color filters according to claim 16 .

Assignees

• Dainippon Ink & Chemicals

Inventors

• Yamada Shogo
• Kiyoto Ikuro

Classifications

• C09B67/0067

  Aqueous dispersions of phthalocyanine pigments containing only dispersing agents · CPC title

• C09B67/0061

  by grinding a dyed resin · CPC title

• C09B67/0035 Primary

  Mixtures of phthalocyanines · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• C09B67/0026

  of phthalocyanine pigments · CPC title