Halogenated zinc phthalocyanine pigment for color filter and method for producing halogenated zinc phthalocyanine pigment for color filter

Patent metadata

Field	Value
Publication number	US-11976199-B2
Application number	US-202017289024-A
Country	US
Kind code	B2
Filing date	Apr 28, 2020
Priority date	Dec 9, 2019
Publication date	May 7, 2024
Grant date	May 7, 2024

Abstract

There is provided a novel halogenated zinc phthalocyanine pigment for a color filter, which can form a green color filter having excellent contrast and high luminance. A halogenated zinc phthalocyanine pigment for a color filter shows, in a Raman spectrum, a peak intensity of 3.0% or more at 716±2.2 cm −1 when a peak intensity at 650±10 cm −1 is regarded as 100%.

First claim

The invention claimed is:

1. A halogenated zinc phthalocyanine pigment for a color filter, wherein in a Raman spectrum, a peak intensity at 716±2.2 cm −1 is 3.0% or more when a peak intensity at 650±10 cm −1 is regarded as 100%.

2. The halogenated zinc phthalocyanine pigment for a color filter according to claim 1 , wherein an intensity at 328 cm −1 is 4.5% or more when a peak intensity at 650±10 cm −1 is regarded as 100%.

3. The halogenated zinc phthalocyanine pigment for a color filter according to claim 1 , wherein a peak intensity at 321±2.2 cm −1 is 12.5% or less when a peak intensity at 650±10 cm −1 is regarded as 100%.

4. A halogenated zinc phthalocyanine pigment for a color filter, wherein in a Raman spectrum, a peak intensity at 713±2.2 cm −1 is 15% or more when a peak intensity at 650±10 cm −1 is regarded as 100%.

5. The halogenated zinc phthalocyanine pigment for a color filter according to claim 4 , wherein a peak intensity at 328±2.2 cm −1 is 2.5% or more when a peak intensity at 650±10 cm −1 is regarded as 100%.

6. A pigment dispersion for a color filter comprising the halogenated zinc phthalocyanine pigment for a color filter according to claim 1 and a dispersant.

7. A curable composition for a color filter green pixel portion, comprising the pig dispersion for a color filter according to claim 6 and a curable resin.

8. A method for producing a halogenated zinc phthalocyanine pigment for a color filter, comprising heating a halogenated zinc phthalocyanine crude pigment under pressure in water to form a pigment.

9. The method for producing a halogenated zinc phthalocyanine pigment for a color filter according to claim 8 , wherein the primary particles of the halogenated zinc phthalocyanine pigment for a color filter have an average particle diameter of 10 nm to 40 nm.

10. The method for producing a halogenated zinc phthalocyanine pigment for a color filter according to claim 8 , wherein the heating temperature is 100° C. to 160° C.

11. A method for producing a pigment dispersion for a color filter, comprising mixing a pigment for a color filter produced by the method according to claim 8 with a dispersant.

12. A method for producing a color filter comprising preparing a curable composition for a color filter green pixel portion by mixing a pigment dispersion for a color filter produced by the method according to claim 11 with a curable resin, and applying the curable composition for a color filter green pixel portion on a transparent substrate.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Sakamoto Keisuke
• Oishi Kentaro
• Asami Ryousuke
• Tokuoka Mayumi
• Shimada Katsunori
• Fujisawa Keisuke

Classifications

• C09B47/10 Primary

  Obtaining compounds having halogen atoms directly bound to the phthalocyanine skeleton · CPC title

• C09B67/0067

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

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• C09B67/009 Primary

  polymeric dispersing agent · CPC title

• C09B67/0026

  of phthalocyanine pigments · CPC title