Black azo pigment and colorant

Patent metadata

Field	Value
Publication number	US-10344166-B2
Application number	US-201716073631-A
Country	US
Kind code	B2
Filing date	Apr 14, 2017
Priority date	Apr 22, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

There are provided: a near-infrared non-absorbing black azo pigment having a sufficient blackness, having an excellent durability such as solvent resistance, and having a novel skeleton; and a colorant that uses the black azo pigment and is useful for forming a black matrix or a light-shielding film. The black azo pigment is represented by the following formula (1), wherein R 1 represents an aryl group optionally having a substituent. In addition, the colorant contains the black azo pigment and is suitable as a material or the like for forming a black matrix for a color filter or for forming a light-shielding film.

First claim

The invention claimed is:

1. A black azo pigment represented by the following formula (1):

wherein R 1 represents an aryl group optionally having a substituent.

2. The black azo pigment according to claim 1 , wherein R 1 in the formula (1) is represented by the following formula (2-X), (2-Y), or (2-Z):

3. The black azo pigment according to claim 1 , having a blackness value of 2.2 or more in terms of an optical density (OD value) in an alkyd/melamine baking paint.

4. The black azo pigment according to claim 1 , being a powder or a particle having a volume average particle diameter of 20 to 1,000 nm.

5. A colorant comprising the black azo pigment according to claim 1 .

6. A black matrix for a color filter comprising the colorant according to claim 5 .

7. A light-shielding film comprising the colorant according to claim 5 .

Assignees

• Dainichiseika Color Chem

Inventors

• Iguchi Kazuki
• Oguma Naomi
• Ozako Shuwa

Classifications

• C09D7/41

  Organic pigments; Organic dyes · CPC title

• C09B67/0092 Primary

  Dyes in solid form · CPC title

• C09B56/02 Primary

  Azomethine-azo dyes {(1,2-Complex dyes of AZOMETHINE and AZO dyes, C09B55/001)} · CPC title

• G02B5/20

  Filters (polarising elements G02B5/30) · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title