# US 2014/0198160 A1 · Copolymer, aqueous ink, and ink cartridge

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- Number: US 2014/0198160 A1
- Document ID: US20140198160A1
- Status: Published application
- Kind: A1
- Application number: 14/154,595
- Filed: 2014-01-14
- Published: 2014-07-17
- Earliest claimed: 2013-01-15
- Assignees: Ricoh Company, Ltd.
- Inventors: Shigeyuki Harada; Tamotsu ARUGA; Hiroshi GOTOU; Hidetoshi FUJII
- Web page: https://patentgrep.com/patent/US20140198160A1

## CPC

- C08F 8/14: Esterification
- B41J 2/17503: {Ink cartridges}
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C09D 11/10: based on artificial resins
- C09D 11/106: containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D 11/30: Inkjet printing inks
- C09D 11/326: characterised by the pigment dispersant
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- 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)

## Abstract

A copolymer contains repeating units represented by the following chemical formulae 1 and 2: In the chemical formulae 1 and 2, R represents a hydrogen atom or a cation; X represents an alkylene group having 2 to 18 carbon atoms; Y represents a single bond, an oxycarbonyl group [(X)—O—CO—(Z)], a carbonyloxy group [(X)—CO—O—(Z)], an ether group (—O—), or an imido group [(X)—N—CO—(—CO—)(Z)]; and Z represents a biphenyl group or a naphthyl group).

## Claims

### Claim 1

A copolymer comprising:
repeating units represented by the following chemical formulae 1 and 2:
where R represents a hydrogen atom or a cation; X represents an alkylene group having 2 to 18 carbon atoms; Y represents a single bond, an oxycarbonyl group [(X)—O—CO—(Z)], a carbonyloxy group [(X)—CO—O—(Z)], an ether group (—O—), or an imido group [(X)—N—CO—(—CO—)(Z)]; and Z represents a biphenyl group or a naphthyl group).

### Claim 2 (depends on 1)

The copolymer according to claim 1, wherein a ratio of the repeating units represented by the chemical formulae 1 and 2 satisfies chemical formulae 1:2=1:1 to 3:1.

### Claim 3 (depends on 1)

The copolymer according to claim 1, wherein Z in the chemical formula 2 represents a naphthyl group.

### Claim 4 (depends on 1)

The copolymer according to claim 1, further comprising a repeating unit represented by the following chemical formula 3.
where R1 represents a hydrogen atom or a methyl group; and R2 represents an alkyl group having 2 to 23 carbon atoms.

### Claim 5 (depends on 1)

An aqueous ink comprising:
water,
a colorant, and
the copolymer of claim 1.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 5)

The aqueous ink according to claim 5, further comprising at least a water-soluble organic solvent or a surfactant.

### Claim 8 (depends on 5)

An ink cartridge comprising:
an ink container; and
the aqueous ink of claim 5 accommodated in the ink container.