Ink, ink set, ink container, image forming method, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-11499062-B2
Application number	US-201816611141-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 28, 2017
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

An ink contains at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.

First claim

The invention claimed is:

1. An ink set comprising:
a yellow ink;
a magenta ink; and a cyan ink,
wherein each ink comprises at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound, wherein a mass ratio (the polyether-modified siloxane compound the aliphatic alcohol alkylene oxide compound) of the polyether-modified siloxane compound to the aliphatic alcohol alkylene oxide compound is from 20/80 to 40/60,
wherein the polyether-modified siloxane compound is at least one member selected from the group consisting of compounds represented by the following Chemical formula III,

where m represents 0 or an integer of from 1 to 23 and n represents an integer of from 1 to 10, a represents an integer of from 1 to 23 and b represents 0 or an integer of from 1 to 23, and R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

2. The ink set according to claim 1 , wherein the compound represented by Chemical formula III is represented by any one of the following Chemical formulae VI to IX,

where n represents an integer of from 2 to 17,

where n represents an integer of from 2 to 17,

where k represents an integer of from 1 to 2, m represents 0 or an integer of from 1 to 5, and n represents an integer of from 3 to 17,

where, k+m represents 0 or an integer of from 1 to 7, 1 represents an integer of from 1 to 2, and n represents an integer of from 2 to 16.

3. The ink set according to claim 1 , wherein the polyether-modified siloxane compound is at least one member selected from the group consisting of compounds represented by the following Chemical formula X to XII,

where m represents an integer of from 1 to 8 and c and d each, independently represent integers of from 1 to 10, and R 2 and R 3 each, independently represent hydrogen atoms or alkyl groups having 1 to 4 carbon atoms,

where e represents an integer of from 1 to 8 and R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms,

where f represents an integer of from 1 to 8, R 5 represents a polyether group represented by the following chemical formula A,

where g represents 0 or an integer of from 1 to 23 and h represents 0 or an integer of from 1 to 23, excluding a case in which g and h are 0 at the same time, and R 6 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.

4. The ink set according to claim 1 , wherein the poly ether-modified, siloxane compound is at least one member selected from the group consisting of compounds represented by the following Chemical formula III,
wherein the aliphatic alcohol alkylene oxide compound is at least one member selected from the group consisting of compounds represented by the following Chemical formula IV,

where m represents 0 or an integer of from 1 to 23 and n represents an integer of from 1 to 10, a represents an integer of from 1 to 23 and h represents 0 or an integer of from 1 to 23, and R represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms,

where R represents an alkyl group having 8 to 13 carbon atoms, R 1 represents a hydrogen atom or a methyl group, and n represents an integer of from 2 to 12.

5. The ink set according to claim 1 , wherein the polyether-modified siloxane compound accounts for 0.01 to 2 percent by mass of each ink.

6. The ink set according to claim 1 , wherein at least one ink further comprises at least one kind of the compound represented by the following Chemical formula V,

where R 1 and R 2 each, independently represent alkyl groups having 3 to 6 carbon atoms, R 3 and R 4 each, independently represent alkyl groups having one or two carbon atoms, and n represents an integer of from 1 to 6.

7. The ink se according to claim 1 , further comprising a black ink comprising at least one kind of polyether-modified siloxane compound and at least one kind of aliphatic alcohol alkylene oxide compound.

8. The ink set according to claim 1 , wherein each ink further comprises at least one kind of organic solvent having a solubility parameter of from 8.96 to 11.79.

9. The ink set according to claim 1 , wherein the aliphatic alcohol alkylene oxide compound is at least one member selected from the group consisting of the compounds represented by the following Chemical formula IV or the group consisting of the compounds represented by the following Chemical formula XIV,

where R represents an alkyl group having 8 to 13 carbon atoms, R 1 represents a hydrogen atom or a methyl group, and n represents an integer of from 2 to 12,

where R 2 represents an aliphatic hydrocarbon group having 6 to 10 carbon atoms, n represents a number of from 0 to 6 representing an average adduct number of propylene oxide, k represents a number of from 0 to 8 representing an average adduct number of ethylene oxide, and a total number of the propylene oxide and the ethylene oxide satisfies the following relation:
3≤ n+k≤ 14.

10. The ink set according to claim 9 , wherein each ink further comprises at least one kind of organic solvent having a solubility parameter of from 8.96 to 11.79.

11. The ink set according to claim 1 , wherein at least one of the inks further comprises at least one kind of organic solvent having a solubility parameter of from 8.96 to 11.79.

12. The ink set according to claim 11 , wherein the organic solvent is at least one member selected from the group consisting of compounds represented by the following Chemical formula I or the group consisting of the following Chemical formula II,

where R′ represents an alkyl group having 4 to 6 carbon atoms,

where R″ represents an alkyl group having 1 to 2 carbon atoms.

13. The ink set according to claim 11 , wherein the organic solvent comprises no polyhydric alcohol having an equilibrium moisture content of 30 percent or more at 23 degrees C. and a relative humidity of 80 percent.

Assignees

• Ricoh Co Ltd

Inventors

• Gotou Hiroshi
• Masuda Yoshiaki
• Ishikawa Masahiko
• Kudo Masaki
• Umemura Kazuhiko
• Katoh Keita
• Matsuyama Akihiko
• Nonogaki Masayasu
• Shibuya Takeshi

Classifications

• C09D11/107 Primary

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/40

  Ink-sets specially adapted for multi-colour inkjet printing · CPC title

• C09D11/36

  based on non-aqueous solvents · CPC title

• B41M5/0023

  Digital printing methods characterised by the inks used (inks per se C09D11/00) · CPC title

• C09D11/322

  Pigment inks · CPC title