Ink, ink container, inkjet recording device, and recording method

Patent metadata

Field	Value
Publication number	US-11059983-B2
Application number	US-201916267442-A
Country	US
Kind code	B2
Filing date	Feb 5, 2019
Priority date	Feb 9, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

An ink comprises a pigment, a quinacridone derivative represented by the following Chemical formula 1.

where R 1 , R 2 , R 3 , and R 4 each, independently represent hydrogen atoms, halogen atoms, or alkyl groups having 1 to 4 carbon atoms. R 5 and R 6 each, independently represent alkyl groups having 1 to 4 carbon atoms, and m and n each, independently represent 0, 1, or 2, excluding a case where both m and n are simultaneously 0, and a solvent A having an SP value of from 9.0 to 11.0, wherein the proportion of the solvent A in the ink is less than 10 percent by mass.

First claim

What is claimed is:

1. An ink, comprising:
a pigment;
a quinacridone derivative represented by the following chemical formula 1,

where R 1 , R 2 , R 3 and R 4 each, independently represent hydrogen atoms, halogen atoms, or alkyl groups having 1 to 4 carbon atoms, R 5 and R 6 each, independently represent alkyl groups having 1 to 4 carbon atoms, and m and n each, independently represent 0, 1, or 2, excluding a case where both m and n are simultaneously 0; and
a solvent A having an SP value of from 9.0 to 11.0,
wherein a proportion of the solvent A in the ink is less than 10 percent by mass.

2. The ink according to claim 1 , wherein a proportion of the solvent A in the ink is from 2 to 8 percent by mass.

3. The ink according to claim 1 , wherein a mass ratio of the quinacridone derivative to the pigment is from 0.01 to 0.10 in the ink.

4. The ink according to claim 1 , wherein a proportion of the quinacridone derivative in the ink is from 0.01 to 1.00 percent by mass.

5. The ink according to claim 4 , wherein a ratio of the quinacridone derivative to the solvent A is from 0.045 to 0.18 in the ink.

6. The ink according to claim 1 , wherein the solvent A is at least one member selected from the group consisting of 3-ethyl-3-hydroxymethyloxetane, isopropylidene glycerol, and N, N-Dimethyl-β-butoxypropionamide.

7. The ink according to claim 1 , wherein the pigment comprises a quinacridone pigment.

8. The ink according to claim 1 , wherein the pigment comprises Colour Index (“C.I.”) Pigment Red 122, C.I. Pigment Violet 19, a mixed crystal of C.I. Pigment Red 122 and C.I. Pigment Violet 19, or a mixed crystal of C.I. Pigment Red 202 and C.I. Pigment Violet 19.

9. The ink according to claim 1 , further comprising a resin emulsion comprising an acrylic resin or a urethane resin.

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

11. The ink according to claim 1 , further comprising a polyether-modified siloxane compound.

12. An ink container comprising:
a container; and
the ink of claim 1 accommodated in the container.

13. An inkjet recording device comprising:
the ink container of claim 12 ; and
a discharging device configured to discharge ink supplied from the ink container of claim 12 .

14. A recording method comprising:
applying the ink of claim 1 to a recording medium.

Assignees

• Matsuyama Akihiko
• Yokohama Yuuki
• SAGARA Amika
• Kudo Masaki
• Umemura Kazuhiko
• Imanaga Yukihiro
• Yoshihara Mayumi
• Ricoh Co Ltd

Inventors

• Matsuyama Akihiko
• Yokohama Yuuki
• SAGARA Amika
• Kudo Masaki
• Umemura Kazuhiko
• Imanaga Yukihiro
• Yoshihara Mayumi

Classifications

• C09D11/102

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

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/12

  based on waxes or bitumen · CPC title

• C09D11/38

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

• C09D11/322 Primary

  Pigment inks · CPC title