# US 10,370,548 B2 · Copolymer, ink including copolymer, and ink-stored container

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- Number: US 10,370,548 B2
- Document ID: US10370548B2
- Status: Granted
- Kind: B2
- Application number: 15/704,834
- Filed: 2017-09-14
- Published: 2018-01-04
- Granted: 2019-08-06
- Earliest claimed: 2015-03-19
- Assignees: Ricoh Company, Ltd.
- Applicants: Shigeyuki Harada; Akihiko Matsuyama; Yoshiki Yanagawa; Masayuki Fukuoka; Takuya Yamazaki; Kazukiyo Nagai; Yuusuke Koizuka; Tomoyuki Shimada; Akiyoshi Sabu
- Inventors: Shigeyuki Harada; Akihiko Matsuyama; Yoshiki Yanagawa; Masayuki Fukuoka; Takuya Yamazaki; Kazukiyo Nagai; Yuusuke Koizuka; Tomoyuki Shimada; Akiyoshi Sabu
- Web page: https://patentgrep.com/patent/US10370548B2

## CPC

- C09D 11/107: from unsaturated acids or derivatives thereof
- B41J 2/17503: {Ink cartridges}
- C08F 220/346: {and further oxygen}
- C08F 220/58: containing oxygen in addition to the carbonamido oxygen {, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine}
- C09D 11/033: characterised by the solvent
- C09D 11/322: Pigment inks
- C09D 11/326: characterised by the pigment dispersant
- C08F 220/365: {containing further carboxylic moieties}
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## Abstract

A copolymer including a structural unit represented by General Formula (1) below, and a structural unit represented by General Formula (2) below, where, in General Formula (1), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation, where, in General Formula (2), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.

## Claims

### Claim 1

A copolymer comprising:
a structural unit represented by General Formula (1) below; and
a structural unit represented by General Formula (2) below,
where, in General Formula (1), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation,
where, in General Formula (2), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.

### Claim 2 (depends on 1)

The copolymer according to claim 1,
wherein a molar ratio of the structural unit represented by General Formula (1) to the structural unit represented by General Formula (2) (the structural unit represented by General Formula (1):the structural unit represented by General Formula (2)) is from 0.5:1 through 3:1.

### Claim 3 (depends on 1)

The copolymer according to claim 1,
wherein, in the structural unit represented by General Formula (2), L2 is an alkylene group having 2 or greater carbon atoms but 12 or less carbon atoms.

### Claim 4 (depends on 1)

The copolymer according to claim 1,
wherein the copolymer is formed by polymerizing a compound represented by General Formula (3) and a compound represented by General Formula (4),
where, in General Formula (3), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation,
where, in General Formula (4), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.

### Claim 5

An ink comprising:
water;
a coloring material; and
a copolymer,
wherein the copolymer is a copolymer including:
a structural unit represented by General Formula (1) below; and
a structural unit represented by General Formula (2) below,
where, in General Formula (1), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation,
where, in General Formula (2), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.

### Claim 6 (depends on 5)

The ink according to claim 5,
wherein the coloring material is a pigment.

### Claim 7 (depends on 5)

The ink according to claim 5, further comprising:
a water-soluble organic solvent, or a surfactant, or both.

### Claim 8

An ink-stored container comprising:
an ink; and
a container storing the ink,
wherein the ink includes:
water;
a coloring material; and
a copolymer,
wherein the copolymer is a copolymer including:
a structural unit represented by General Formula (1) below; and
a structural unit represented by General Formula (2) below,
where, in General Formula (1), R1 is a hydrogen atom or a methyl group, L1 is an alkylene group having 2 or greater carbon atoms but 5 or less carbon atoms, and X is a hydrogen atom or a cation,
where, in General Formula (2), R2 is a hydrogen atom or a methyl group and L2 is an alkylene group having 2 or greater carbon atoms but 18 or less carbon atoms.