# US 9,752,037 B2 · Inkjet recording ink, ink cartridge, inkjet recording method, inkjet recording device and ink recorded matter

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- Number: US 9,752,037 B2
- Document ID: US9752037B2
- Status: Granted
- Kind: B2
- Application number: 14/766,836
- Filed: 2014-02-27
- Published: 2015-12-31
- Granted: 2017-09-05
- Earliest claimed: 2013-03-15
- Assignees: Ricoh Company, Ltd.; Goo Chemical Co., Ltd.
- Applicants: Minoru Hakiri; Mitsuru Naruse; Masayasu Nonogaki; Keita Katoh; Akihiko Matsuyama; Kazukiyo Nagai; Yuusuke Koizuka; Masato Matsumura; Takuya Furuta
- Inventors: Minoru Hakiri; Mitsuru Naruse; Masayasu Nonogaki; Keita Katoh; Akihiko Matsuyama; Kazukiyo Nagai; Yuusuke Koizuka; Masato Matsumura; Takuya Furuta
- Web page: https://patentgrep.com/patent/US9752037B2

## CPC

- C09D 11/107: from unsaturated acids or derivatives thereof
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C09D 11/30: Inkjet printing inks
- C09D 11/326: characterised by the pigment dispersant
- C09D 133/14: of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
- C09D 143/02: Homopolymers or copolymers of monomers containing phosphorus
- C08F 220/1818: {C13or longer chain (meth)acrylate, e.g. stearyl (meth)acrylate}
- 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

An inkjet recording ink, including: water; a water-soluble organic solvent; a pigment; and a phosphate group-containing copolymer, wherein the phosphate group-containing copolymer contains a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2): where R1 denotes a hydrogen atom or a methyl group; M+ denotes an alkali metal ion, an organic amine ion, or a hydrogen ion; half or more of M+ in the copolymer is the alkali metal ion or the organic amine ion, the remainder of M+ is the hydrogen ion; n and m each denote an integer of 0 to 6, provided that both of n and m are not 0; and a block of (C2H4O) and a block of (C3H6O) may be exchanged with each other, where R2 denotes a hydrogen atom or a methyl group.

## Claims

### Claim 1

An inkjet recording ink, comprising:
water;
a water-soluble organic solvent;
a pigment; and
a phosphate group-containing copolymer,
wherein the phosphate group-containing copolymer comprises a structural unit represented by the following General Formula (1) and a structural unit represented by the following General Formula (2):
where R1 denotes a hydrogen atom or a methyl group; M+ denotes an alkali metal ion, an organic amine ion, or a hydrogen ion; half or more of M+ in the copolymer is the alkali metal ion or the organic amine ion, the remainder of M+ is the hydrogen ion; n and m each denote an integer of 0 to 6, provided that both of n and m are not 0; and a block of (C2H4O) and a block of (C3H6O) may be exchanged with each other,
where R2 denotes a hydrogen atom or a methyl group, wherein the structural unit represented by the General Formula (1) is contained in the phosphate group-containing copolymer in a percentage of 10% by mass to 60% by mass relative to the mass of the phosphate group-containing copolymer.

### Claim 2 (depends on 1)

The inkjet recording ink according to claim 1, wherein the phosphate group-containing copolymer further comprises a structural unit represented by the following General Formula (3), a structural unit represented by the following General Formula (4), or both thereof:
where R3 denotes a hydrogen atom or a methyl group,
where R4 denotes a hydrogen atom or a methyl group.

### Claim 3 (depends on 1)

The inkjet recording ink according to claim 1, wherein the phosphate group-containing copolymer has a weight average molecular weight of 5,000 to 50,000.

### Claim 4 (depends on 1)

The inkjet recording ink according to claim 1, wherein the phosphate group-containing copolymer is synthesized by allowing a monomer represented by the following General Formula (5) to polymerize with a monomer represented by the following General Formula (6), followed by neutralizing with an alkali metal salt or an organic amine base:
where R5 denotes a hydrogen atom or a methyl group, and n and m each denote an integer of 0 to 6, provided that both of n and m are not 0,
where R6 denotes a hydrogen atom or a methyl group.

### Claim 5 (depends on 4)

The inkjet recording ink according to claim 4, wherein the phosphate group-containing copolymer is allowed to further polymerize with a monomer represented by the following General Formula (7), a monomer represented by the following General Formula (8), or both thereof:
where R7 denotes a hydrogen atom or a methyl group,
where R8 denotes a hydrogen atom or a methyl group.

### Claim 6 (depends on 1)

An ink cartridge, comprising:
a container; and
the inkjet recording ink according to claim 1 contained in the container.

### Claim 7 (depends on 6)

An inkjet recording device, comprising:
the ink cartridge according to claim 6.

### Claim 8 (depends on 1)

An inkjet recording method, comprising:
applying a stimulus to the inkjet recording ink according to claim 1 to allow the inkjet recording ink to jet, to thereby record an image.

### Claim 9 (depends on 1)

An ink recorded matter, comprising:
a recording medium; and
an image recorded with the inkjet recording ink according to claim 1.