Inkjet ink, ink cartridge, and inkjet recording device

Patent metadata

Field	Value
Publication number	US-9284464-B2
Application number	US-201414541396-A
Country	US
Kind code	B2
Filing date	Nov 14, 2014
Priority date	Nov 19, 2013
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An inkjet ink including: water; a water-soluble organic solvent; a pigment; polycarbonate modified urethane resin particles; an ultraviolet absorber; and a light stabilizer.

First claim

What is claimed is:

1. An inkjet ink, comprising:
water;
a water-soluble organic solvent;
a pigment;
polycarbonate-modified urethane resin particles;
an ultraviolet absorber; and
a light stabilizer,
wherein each of the ultraviolet absorber and the light stabilizer is contained in water-insoluble acrylic polymer particles.

2. The inkjet ink according to claim 1 , wherein the pigment is a white pigment.

3. The inkjet ink according to claim 1 , wherein a mass ratio (A/B) of the ultraviolet absorber (A) to the light stabilizer (B) is from 1/0.1 to 1/2.

4. The inkjet ink according to claim 1 , wherein an amount of the ultraviolet absorber is from 0.05% by mass to 1% by mass, and an amount of the light stabilizer is from 0.05% by mass to 1% by mass.

5. The inkjet ink according to claim 1 , wherein an amount of the polycarbonate-modified urethane resin particles is from 0.5% by mass to 10% by mass.

6. The inkjet ink according to claim 1 , wherein the water-soluble organic solvent comprises a water-soluble organic solvent having a boiling point of 220° C. or lower.

7. The inkjet ink according to claim 1 , wherein the water-soluble organic solvent comprises propylene glycol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol or 2,3-butanediol, or any combination thereof.

8. The inkjet ink according to claim 1 , further comprising a polyethylene wax.

9. The inkjet ink according to claim 1 , further comprising a levelling agent, wherein the levelling agent is polyether-modified polydimethylsiloxane.

10. An ink cartridge, comprising:
an inkjet ink; and
a container, in which the inkjet ink is housed,
wherein the inkjet ink comprises: water; a water-soluble organic solvent; a pigment; polycarbonate-modified urethane resin particles; an ultraviolet absorber; and a light stabilizer, and
wherein each of the ultraviolet absorber and the light stabilizer is contained in water-insoluble acrylic polymer particles.

11. An inkjet recording device, comprising:
an ink jetting unit configured to apply a stimulus to an inkjet ink to allow the inkjet ink to jet, to thereby record an image on a recording medium; and
a heating unit configured to heat the recording medium on which the image has been recorded,
wherein the inkjet ink comprises: water; a water-soluble organic solvent; a pigment; polycarbonate-modified urethane resin particles; an ultraviolet absorber; and a light stabilizer,
wherein each of the ultraviolet absorber and the light stabilizer is contained in water-insoluble acrylic polymer particles.

12. The inkjet recording device according to claim 11 , wherein the recording medium is a non-porous base material.

Assignees

• Nagashima Hidefumi
• Toda Naohiro
• Nakagawa Tomohiro
• Furukawa Juichi
• Fujii Ichiroh
• Ricoh Co Ltd

Inventors

• Nagashima Hidefumi
• Toda Naohiro
• Nakagawa Tomohiro
• Furukawa Juichi
• Fujii Ichiroh

Classifications

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• C08G18/6625

  with compounds of group C08G18/34 · CPC title

• C08K5/34926

  also containing heterocyclic groups other than triazine groups · CPC title

• C08K5/3475

  condensed with carbocyclic rings · CPC title

• C09D175/06

  from polyesters · CPC title