Non-aqueous pigment ink

Patent metadata

Field	Value
Publication number	US-9593251-B2
Application number	US-201615157804-A
Country	US
Kind code	B2
Filing date	May 18, 2016
Priority date	Jul 5, 2012
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A non-aqueous pigment ink includes a pigment, a non-aqueous solvent, a non-water-soluble resin and a water-soluble resin, wherein the non-water-soluble resin is an acrylic polymer formed by a copolymer of a monomer mixture containing at least an alkyl (meth)acrylate (A) having a C8 to C18 alkyl group and a monomer (B) having a β-diketone group or β-keto acid ester group.

First claim

What is claimed is:

1. A non-aqueous pigment ink comprising:
a pigment;
a non-aqueous solvent;
a non-water-soluble resin; and
a water-soluble resin;
wherein the non-water-soluble resin is an acrylic polymer formed by a copolymer of a monomer mixture containing at least an alkyl (meth)acrylate (A) having a C 8 to C 18 alkyl group and a monomer (B) having a β-diketone group or β-keto acid ester group; and
the acrylic polymer does not include a urethane group.

2. The non-aqueous pigment ink as claimed in claim 1 , wherein the water-soluble resin is a polyethylene imine having a mass average molecular weight of from 200 to 2000.

3. The non-aqueous pigment ink as claimed in claim 1 , wherein a content of the water-soluble resin is from 0.01 to 0.5 in mass ratio relative to the pigment.

4. The non-aqueous pigment ink as claimed in claim 1 , wherein a content of the acrylic polymer is from 0.1 to 1.0 in mass ratio relative to the pigment.

5. The non-aqueous pigment ink as claimed in claim 1 , wherein a content of the acrylic polymer is from 0.1 to 20 in mass ratio relative to the water-soluble resin.

6. The non-aqueous pigment ink as claimed in claim 1 , wherein the monomer (B) has a β-diketone group.

7. The non-aqueous pigment ink as claimed in claim 6 , wherein the β-diketone group is an acetoacetyl group or a propion acetyl group.

8. The non-aqueous pigment ink as claimed in claim 1 , wherein the monomer (B) has a β-keto acid ester group.

9. The non-aqueous pigment ink as claimed in claim 8 , wherein the β-keto acid ester group is an acetoacetoxy group or a propion acetoxy group.

10. The non-aqueous pigment ink as claimed in claim 1 , wherein the content of the alkyl (meth)acrylate (A) having a C 8 to C 18 alkyl group in the monomer mixture is 30 mass % or more.

11. The non-aqueous pigment ink as claimed in claim 1 , wherein the content of the monomer (B) having a β-diketone group or β-keto acid ester group in the monomer mixture is from 3 mass % to 30 mass %.

12. The non-aqueous pigment ink as claimed in claim 1 , wherein the content of the alkyl (meth)acrylate (A) having a C 8 to C 18 alkyl group in the monomer mixture is from 50 mass % to 90 mass %, and the content of the monomer (B) having a β-diketone group or β-keto acid ester group in the monomer mixture is from 5 mass % to 20 mass %.

Assignees

• Riso Kagaku Corp

Inventors

• Hosoya Tetsuo
• Endo Toshihiro
• Ezaki Naofumi
• Shimura Shinichiro
• Torita Naoyuki
• Morinaga Marie

Classifications

• C09D11/10

  based on artificial resins · CPC title

• C09D11/36 Primary

  based on non-aqueous solvents · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title