# US 2019/0169455 A1 · Aqueous pigment dispersion

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- Number: US 2019/0169455 A1
- Document ID: US20190169455A1
- Status: Published application
- Kind: A1
- Application number: 16/324,026
- Filed: 2017-08-09
- Published: 2019-06-06
- Earliest claimed: 2016-08-12
- Assignees: Kao Corporation
- Applicants: Kao Corporation
- Inventors: Tetsuya EGUCHI; Hirokazu HYAKUDA
- Web page: https://patentgrep.com/patent/US20190169455A1

## CPC

- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 17/001: {in aqueous medium (C09D17/003, C09D17/004 take precedence)}
- B41J 2/01: Ink jet
- B41J 3/4078: {Printing on textile}
- B41M 5/00: Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00})
- B41M 5/0023: {Digital printing methods characterised by the inks used (inks per se C09D11/00)}
- B41M 7/009: {using thermal means, e.g. infrared radiation, heat}
- C08F 212/08: Styrene
- C08F 220/06: Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
- C08L 33/02: Homopolymers or copolymers of acids; Metal or ammonium salts thereof
- C09D 11/033: characterised by the solvent
- C09D 11/037: characterised by the pigment
- C09D 11/10: based on artificial resins
- C09D 11/106: containing macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09D 11/107: from unsaturated acids or derivatives thereof
- C09D 11/322: Pigment inks
- C09D 11/326: characterised by the pigment dispersant
- C09D 17/00: Pigment pastes, e.g. for mixing in paints (artists' paints C09D5/06)
- C09D 17/003: {containing an organic pigment (process features in the making of dye stuff preparations C09B67/00)}
- C09D 17/005: {Carbon black}
- D06P 1/44: using insoluble pigments or auxiliary substances, e.g. binders
- D06P 1/5221: {Polymers of unsaturated hydrocarbons, e.g. polystyrene polyalkylene}
- D06P 1/5228: {Polyalkenyl alcohols, e.g. PVA}
- D06P 1/5257: {(Meth)acrylic acid}
- D06P 1/54: Substances with reactive groups together with crosslinking agents
- D06P 1/645: Aliphatic, araliphatic or cycloaliphatic compounds containing amino groups
- D06P 5/30: Ink jet printing
- 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
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- D06P: DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM

## Abstract

The present invention relates to a pigment water dispersion containing pigment-containing water-insoluble crosslinked polymer A particles, a water-soluble basic compound and water, in which a water-insoluble crosslinked polymer A constituting the particles has a carboxy group and a crosslinked structure containing an ester group derived from a water-insoluble crosslinking agent, a saponification value of the water-insoluble crosslinked polymer A is from 170 to 300 mgKOH/g, and the water-soluble basic compound contains a water-soluble amine compound; a process for producing the pigment water dispersion; a water-based ink for ink-jet printing which contains the pigment water dispersion; and an ink-jet printing method using the water-based ink.

## Claims

### Claim 1

A pigment water dispersion comprising pigment-containing water-insoluble crosslinked polymer A particles, a water-soluble basic compound and water,
in which a water-insoluble crosslinked polymer A constituting the particles comprises a carboxy group and a crosslinked structure comprising an ester group derived from a water-insoluble crosslinking agent;
a saponification value of the water-insoluble crosslinked polymer A is not less than 170 mgKOH/g and not more than 300 mgKOH/g; and
the water-soluble basic compound comprises a water-soluble amine compound.

### Claim 2 (depends on 1)

The pigment water dispersion according to claim 1, wherein a content of the water-soluble amine compound in the water-soluble basic compound is not less than 50 mol %.

### Claim 3 (depends on 1)

The pigment water dispersion according to claim 1, wherein a boiling point of the water-soluble amine compound is not lower than 85° C. and not higher than 350° C.

### Claim 4 (depends on 1)

The pigment water dispersion according to claim 1, wherein the water-soluble amine compound is an alkanolamine having not less than 2 and not more than 8 carbon atoms.

### Claim 5 (depends on 1)

The pigment water dispersion according to claim 1, wherein a water solubility rate of the water-insoluble crosslinking agent is not more than 50% by mass.

### Claim 6 (depends on 1)

The pigment water dispersion according to claim 1, wherein the water-insoluble crosslinking agent is a polyfunctional epoxy compound.

### Claim 7 (depends on 6)

The pigment water dispersion according to claim 6, wherein the polyfunctional epoxy compound is a compound comprising not less than 2 and not more than 3 glycidyl ether groups derived from a polyhydric alcohol comprising a hydrocarbon group having not less than 3 and not more than 6 carbon atoms.

### Claim 8 (depends on 1)

The pigment water dispersion according to claim 1, wherein the water-insoluble crosslinked polymer A is a polymer obtained by subjecting a carboxy group-containing water-insoluble polymer A′ to crosslinking treatment.

### Claim 9 (depends on 1)

The pigment water dispersion according to claim 1, wherein a mass ratio of the pigment to the water-insoluble crosslinked polymer A [pigment/water-insoluble crosslinked polymer A] is not less than 30/70 and not more than 90/10.

### Claim 10

A process for producing a pigment water dispersion comprising pigment-containing water-insoluble crosslinked polymer A particles, a water-soluble basic compound and water, said process comprising:
Step I: subjecting a mixture comprising a carboxy group-containing water-insoluble polymer A′, a water-soluble basic compound and water to dispersion treatment to obtain a polymer dispersion;
Step II: adding a pigment to the polymer dispersion obtained in the step I and then subjecting the resulting mixture to dispersion treatment to obtain an aqueous pigment dispersion solution; and
Step III: adding a water-insoluble crosslinking agent to the aqueous pigment dispersion solution obtained in the step II to subject the polymer to crosslinking treatment, thereby obtaining the pigment water dispersion,
in which a saponification value of a water-insoluble crosslinked polymer A constituting the particles is not less than 170 mgKOH/g and not more than 300 mgKOH/g; and
the water-soluble basic compound in the pigment water dispersion comprises a water-soluble amine compound.

### Claim 11 (depends on 10)

The process for producing a pigment water dispersion according to claim 10, wherein a neutralization degree of the carboxy groups in the water-insoluble polymer A′ in the step I is not less than 10 mol % and not more than 80 mol %.

### Claim 12 (depends on 10)

The process for producing a pigment water dispersion according to claim 10, wherein the water-insoluble polymer A′ comprises a constitutional unit derived from (a-1) a carboxy group-containing monomer and a constitutional unit derived from (a-2) a hydrophobic monomer.

### Claim 13 (depends on 1)

A water-based ink for ink-jet printing comprising the pigment water dispersion according to claim 1, and a water-soluble organic solvent,
in which the water-soluble organic solvent comprises one or more organic solvents each having a boiling point of not lower than 90° C., and a boiling point of the water-soluble organic solvent as a weighted mean value of boiling points of the one or more organic solvents which are weighted by contents (% by mass) of the respective organic solvents is not higher than 250° C.

### Claim 14 (depends on 13)

An ink-jet printing method comprising the steps of:
ejecting the water-based ink for ink-jet printing according to claim 13 by an ink-jet ejecting method to allow the water-based ink to adhere onto a printing medium; and
then drying the printing medium onto which the water-based ink is adhered, at a temperature of not lower than 40° C.

### Claim 15 (depends on 14)

The ink-jet printing method according to claim 14, wherein the printing medium is a fiber.

### Claim 16 (depends on 1)

The pigment water dispersion according to claim 1, wherein the water-insoluble polymer A′ comprises a constitutional unit derived from (a-1) a carboxy group-containing monomer and a constitutional unit derived from (a-2) a hydrophobic monomer.

### Claim 17 (depends on 16)

The pigment water dispersion according to claim 16, wherein a mass ratio of the component (a-1) to the component (a-2) [component (a-1)/component (a-2)] is not less than 0.05 and not more than 1.2.

### Claim 18 (depends on 1)

The pigment water dispersion according to claim 1, wherein the water-soluble amine compound is at least one compound selected from the group consisting of N-methyl diethanolamine, N,N-dimethyl ethanolamine, diethanolamine and triethanolamine.

### Claim 19 (depends on 1)

The pigment water dispersion according to claim 1, wherein the content of the pigment in the pigment water dispersion is not less than 3.0% by mass and not more than 20% by mass.

### Claim 20 (depends on 13)

The water-based ink according to claim 13, further comprises pigment-free water-insoluble polymer B particles.