Ink, ink container, inkjet recording device, and recorded matter

Patent metadata

Field	Value
Publication number	US-2016222234-A1
Application number	US-201615001829-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Jan 29, 2015
Publication date	Aug 4, 2016
Grant date	—

Abstract

An ink includes a pigment, a wax, a water soluble solvent including a solvent having an SP value of from 9.0 to 11.0, and water, wherein the mass ratio of the content of the wax in the ink to the content of the solvent having an SP value of from 9.0 to 11.0 is in a range of from 1.0:2.5 to 1.0:25.0.

First claim

What is claimed is:

1 . An ink comprising:
a pigment; a wax; a water soluble solvent including a solvent having an SP value of from 9.0 to 11.0; and water, wherein a mass ratio of a content of the wax in the ink to a content of the solvent having an SP value of from 9.0 to 11.0 is in a range of from 1.0:2.5 to 1.0:25.0.

2 . The ink according to claim 1 , wherein a ratio of the solvent having an SP value of from 9.0 to 11.0 to a total content of the water soluble solvent in the ink is 80 percent by mass or greater.

3 . The ink according to claim 1 , wherein the solvent having an SP value of from 9.0 to 11.0 includes at least one member selected from the group consisting of isopropylidene glycerol, 3-ethyl-3-hydroxymethyloxetane, and N,N-dimethyl-β-butoxypropionamide.

4 . The ink according to claim 1 , further comprising a copolymer having a structure unit represented by the following Chemical formula I and a structure unit represented by the following Chemical formula II.

where R1 represents a hydrogen atom or a methyl group, R2 represents a hydrogen atom or a methyl group, X represents a hydrogen atom or a cation, and L represents an alkylene group having 2 to 18 carbon atoms.

5 . The ink according to claim 4 , wherein a molar ratio of the structure unit represented by Chemical formula I to the structure unit represented by Chemical formula II is from 0.5:1.0 to 3.0:1.0.

6 . The ink according to claim 1 , further comprising a copolymer having a neutralized phosphoric acid group or a neutralized bisphosphonic acid group.

7 . The ink according to claim 1 , wherein a surface of the pigment is chemically modified by a neutralized phosphoric acid group or a neutralized bisphosphonic acid group.

8 . The ink according to claim 4 , wherein the pigment is dispersed in the ink by a copolymer having a neutralized phosphoric acid group or a neutralized bisphosphonic acid group or a copolymer having a structure unit represented by Chemical formula I and a structure unit represented by Chemical formula II.

9 . The ink according to claim 1 , wherein the wax includes a polyethylene wax having a melting point of from 100 degrees C. to 140 degrees C.

10 . The ink according to claim 1 , wherein the wax includes a polyethylene wax having a volume average particle diameter of from 20 nm to 150 nm.

11 . The ink according to claim 1 , further comprising at least one of a compound represented by the following Chemical formula 1 or a compound represented by the following Chemical formula 2,

where a represents a numeral in a range of from 8 to 9,

where a represents a numeral in a range of from 8 to 9.

12 . An ink container comprising:
an ink containing unit; and the ink of claim 1 contained in the ink containing unit.

13 . An inkjet recording device comprising:
an ink container that contains the ink of claim 1 ; and a recording head to discharge the ink supplied from the ink container.

14 . Recorded matter comprising:
a recording medium; and an image formed on the recording medium using the ink of claim 1 .

Assignees

• Matsuyama Akihiko
• Goto Hiroshi
• Namba Michihiko
• Fujii Hidetoshi
• SAGARA Amika
• Nagai Kazukiyo
• Shimada Tomoyuki
• Harada Shigeyuki
• Yanagawa Yoshiki
• Sabu Akiyoshi
• Koizuka Yuusuke
• Fukuoka Masayuki
• Yamazaki Takuya

Inventors

• Matsuyama Akihiko
• Gotou Hiroshi
• Namba Michihiko
• Fujii Hidetoshi
• SAGARA Amika
• Nagai Kazukiyo
• Shimada Tomoyuki
• Harada Shigeyuki
• Yanagawa Yoshiki
• Sabu Akiyoshi
• Koizuka Yuusuke
• Fukuoka Masayuki
• Yamazaki Takuya

Classifications

• C09D11/322 Primary

  Pigment inks · CPC title

• C09D11/10

  based on artificial resins · CPC title

• C09D11/12

  based on waxes or bitumen · CPC title