Preparation of aqueous green dispersions

Patent metadata

Field	Value
Publication number	US-9828514-B2
Application number	US-201615092649-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 7, 2016
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

An aqueous organic pigment dispersion contains a green copper phthalocyanine pigment and an azo-coupled β-ketoamide pigment. It also includes an organic pigment dispersant at 40 weight % to 100 weight %, based on the sum of the weights of the organic pigments. This aqueous organic pigment dispersion can be combined with a humectant to provide an aqueous green inkjet ink composition. The weight ratio of the green copper phthalocyanine pigment to the azo-coupled β-ketoamide pigment is from 1:1 to 10:1. The median particle diameter of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment is less than 85 nm. At least 95% of the total particles of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment have a particle diameter of less than 150 nm. The aqueous green inkjet ink compositions can be used in various inkjet printing methods.

First claim

The invention claimed is:

1. A method of making an aqueous organic pigment dispersion, comprising:
mixing a green copper phthalocyanine pigment with an azo-coupled β-ketoamide pigment and at least one organic pigment dispersant such that the weight ratio of the green copper phthalocyanine pigment to the azo-coupled β-ketoamide pigment is from 1:1 to and including 10:1, and the median particle diameter of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment is less than 85 nm and at least 95% of the total particles of each of the green copper phthalocyanine pigment and the azo-coupled β-ketoamide pigment have a particle diameter of less than 150 nm, when measured in intensity mode using a laser light scattering particle size analyzer,
wherein the aqueous organic pigment dispersion exhibits CIELAB color characteristics of a* of at least −80 and up to and including −20, b* of at least 20 and up to and including 80, and L* of at least 20 and up to and including 90.

2. The method of claim 1 , wherein the weight ratio of the green copper phthalocyanine pigment mixed with the azo-coupled β-ketoamide pigment is from 3:1 to and including 6:1.

3. The method of claim 1 , wherein the azo-coupled β-ketoamide pigment is a yellow mono-azo-coupled β-ketoamide pigment.

4. The method of claim 1 , wherein the green copper phthalocyanine pigment is a halogenated green copper phthalocyanine pigment.

5. The method of claim 1 , wherein the green copper phthalocyanine pigment is C.I. Pigment Green 7 and the azo-coupled β-ketoamide pigment is Pigment Yellow 74.

6. The method of claim 1 , wherein the green copper phthalocyanine pigment is present in an amount of at least 4 weight % and up to and including 15 weight %, based on the total weight of the aqueous organic pigment dispersion.

Assignees

• Eastman Kodak Co

Inventors

• Lussier Barbara Boland
• Linehan Daniel Talbot

Classifications

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/102

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• C09D11/38

  characterised by non-macromolecular additives other than solvents, pigments or dyes · CPC title

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D17/003

  containing an organic pigment (process features in the making of dye stuff preparations C09B67/00) · CPC title