Copper phthalocyanine pigment composition and ink composition containing same

Patent metadata

Field	Value
Publication number	US-11987714-B2
Application number	US-201917253844-A
Country	US
Kind code	B2
Filing date	Jun 13, 2019
Priority date	Jul 18, 2018
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A usual ink composition can be expected to improve ink viscosity to a certain degree, but when used for a glycol ether-based ink recently required, an increase in viscosity in preparing the ink cannot be suppressed. In addition, there is unknown a copper phthalocyanine pigment composition which can satisfy both such an improvement in ink viscosity and resolubility as printability which is important for the glycol ether-based ink. In this situation, a problem to be solved by the present invention is to provide a copper phthalocyanine pigment composition having low viscosity and excellent resolubility in a glycol ether-based ink. It was found that when a copper phthalocyanine pigment is combined with a specified copper phthalocyanine acid derivative, a pigment composition having significantly low viscosity when formed into a glycol ether-based ink, and good familiarity with the ink can be produced, leading to the achievement of the present invention.

First claim

The invention claimed is:

1. A copper phthalocyanine pigment composition comprising:
a copper phthalocyanine pigment;
a copper phthalocyanine sulfonic acid derivative represented by general formula (I),

[in the formula, n represents an average number of substituents of 0.5 to 1.5];
a copper phthalocyanine derivative represented by general formula (II),

[in the formula, R 1 represents a C 1 -C 20 alkyl group, and n represents an average number of substituents of 0.5 to 1.5]; and
a copper phthalocyanine derivative represented by general formula (III),

[in the formula, R 2 , R 3 , R 4 , and R 5 each independently represent a C 1 -C 20 alkyl group, at least one of R 2 , R 3 , R 4 , and R 5 is a C 6 -C 2G alkyl group, and n represents an average number of substituents of 0.5 to 1.5],
wherein the content of the copper phthalocyanine sulfonic acid derivative represented by the general formula (I) is 2% by mass or more and 4% by mass or less in the entire pigment composition, the content of the copper phthalocyanine derivative represented by the general formula (II) is 5% by mass or more and 6% by mass or less in the entire pigment composition, and the content of the copper phthalocyanine derivative represented by the general formula (III) is 0.5% by mass or more and 5% by mass or less in the entire pigment composition.

2. An ink composition comprising the copper phthalocyanine pigment composition according to claim 1 , a nitrocellulose resin, and a glycol ether-based solvent.

Assignees

• Dainippon Ink & Chemicals

Inventors

• Saitou Shingo
• HASHIGUCHI Taichi

Classifications

• C09D11/037 Primary

  characterised by the pigment · CPC title

• C09B67/0067

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

• C09B67/009

  polymeric dispersing agent · CPC title

• C09D11/033 Primary

  characterised by the solvent · CPC title

• C09D11/08

  based on natural resins · CPC title