Copolymer, aqueous ink, and ink cartridge

Patent metadata

Field	Value
Publication number	US-10035869-B2
Application number	US-201615547668-A
Country	US
Kind code	B2
Filing date	Jan 28, 2016
Priority date	Feb 2, 2015
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

To provide a copolymer including: a structural unit represented by the following General Formula (1) where X represents a hydrogen atom or a cation; a structural unit expressed by the following Structural Formula (1); and a structural unit represented by the following General Formula (2) where R is a hydrogen atom or a methyl group, L is a single bond or —(CH 2 ) n —O—CO— where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the —(CH 2 ) n —O—CO— is bound to naphthyl.

First claim

The invention claimed is:

1. A copolymer comprising:
a structural unit represented by the following General Formula (1);
a structural unit expressed by the following Structural Formula (1); and
a structural unit represented by the following General Formula (2),

wherein in the General Formula (1), X represents a hydrogen atom or a cation,

wherein in the General Formula (2), R is a hydrogen atom or a methyl group, L is a single bond or —(CH 2 ) n —O—CO— where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the —(CH 2 ) n —O—CO— is bound to naphthyl.

2. The copolymer according to claim 1 , wherein an amount of the structural unit represented by the General Formula (2) in the copolymer is in a range of from 20 mol % through 80 mol %.

3. The copolymer according to claim 1 , wherein the copolymer is formed through polymerization of a compound represented by the following General Formula (3), a compound expressed by the following Structural Formula (2), and a compound represented by the following General Formula (4),

wherein in the General Formula (3), X is a hydrogen atom or a cation,

wherein in the General Formula (4), R is a hydrogen atom or a methyl group, L is a single bond or —(CH 2 ) n —O—CO— where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the —(CH 2 ) n —O—CO— is bound to naphthyl.

4. An aqueous ink comprising:
water;
a colorant; and
a copolymer,
wherein the copolymer is the copolymer according to claim 1 .

5. The aqueous ink according to claim 4 , wherein the colorant comprises a pigment.

6. The aqueous ink according to claim 4 , further comprising at least one selected from the group consisting of water-soluble organic solvents and surfactants.

7. An ink cartridge comprising:
a container; and
the aqueous ink according to claim 4 stored in the container.

8. An inkjet recording device comprising:
an ink jetting unit configured to apply a stimulus to an aqueous ink to jet the aqueous ink and record an image on a recording medium,
wherein the aqueous ink comprises:
water;
a colorant; and
a copolymer,
and wherein the copolymer is a copolymer comprising:
a structural unit represented by the following General Formula (1);
a structural unit expressed by the following Structural Formula (1); and
a structural unit represented by the following General Formula (2),

wherein in the General Formula (1), X represents a hydrogen atom or a cation,

wherein in the General Formula (2), R is a hydrogen atom or a methyl group, L is a single bond or —(CH 2 ) n —O—CO— where n is an integer in a range of from 2 through 18, and a carbonyl carbon atom in the —(CH 2 ) n —O—CO— is bound to naphthyl.

9. An inkjet recording method comprising:
applying a stimulus to the aqueous ink according to claim 4 to jet the aqueous ink and record an image on a recording medium.

10. A recorded matter comprising:
an image recorded by the aqueous ink according to claim 4 .

Assignees

• Harada Shigeyuki
• Yanagawa Yoshiki
• Katoh Keita
• Fukuoka Masayuki
• Nagai Kazukiyo
• Koizuka Yuusuke
• Shimada Tomoyuki
• Sabu Akiyoshi
• Ricoh Co Ltd

Inventors

• Harada Shigeyuki
• Yanagawa Yoshiki
• Katoh Keita
• Fukuoka Masayuki
• Nagai Kazukiyo
• Koizuka Yuusuke
• Shimada Tomoyuki
• Sabu Akiyoshi

Classifications

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D11/322

  Pigment inks · CPC title

• C08F212/08

  Styrene · CPC title

• C09D11/326

  characterised by the pigment dispersant · CPC title

• C09D11/30

  Inkjet printing inks · CPC title