# US 10,870,770 B2 · Aqueous ink, ink cartridge and ink jet recording method

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- Number: US 10,870,770 B2
- Document ID: US10870770B2
- Status: Granted
- Kind: B2
- Application number: 16/027,501
- Filed: 2018-07-05
- Published: 2019-01-10
- Granted: 2020-12-22
- Earliest claimed: 2017-07-07
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Junichi Sakai; Tsuyoshi Kanke; Akiko Tominaga; Mamiko Kaji; Takashi Imai
- Web page: https://patentgrep.com/patent/US10870770B2

## CPC

- C09D 11/322: Pigment inks
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C08K 5/053: Polyhydroxylic alcohols
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- C09D 11/324: containing carbon black
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

An aqueous ink that enables recording of an image with suppressed feathering and has high ejection stability can be provided. An aqueous ink for ink jet contains a pigment, a polyhydric alcohol derivative and a water-soluble organic solvent. The polyhydric alcohol derivative is a compound in which a proportion of {Y/(X+Y)}×100 (%) where X mole(s) of ethylene oxide group(s) and Y mole(s) of propylene oxide group(s) are added to polyhydric alcohol having three or more hydroxy groups is 55% or more to 95% or less. The water-soluble organic solvent includes a first water-soluble organic solvent having a relative dielectric constant of 10.0 or more to 40.0 or less.

## Claims

### Claim 1

An aqueous ink for ink jet, the aqueous ink comprising:
(i) a pigment;
(ii) a polyhydric alcohol derivative; and
(iii) a water-soluble organic solvent,
wherein the polyhydric alcohol derivative is a compound in which a proportion of {Y/(X+Y)}×100(%), where X mole(s) of ethylene oxide group(s) and Y mole(s) of propylene oxide group(s) are added to a polyhydric alcohol having three or more hydroxy groups, is 55% or more to 95% or less, and
wherein the water-soluble organic solvent comprises a first water-soluble organic solvent having a relative dielectric constant of 10.0 or more to 40.0 or less.

### Claim 2 (depends on 1)

The aqueous ink according to claim 1, wherein the proportion of {Y/(X+Y)}×100(%) is 70% or more to 90% or less.

### Claim 3 (depends on 1)

The aqueous ink according to claim 1, wherein the polyhydric alcohol derivative has a molecular weight of 1,500 or more to 25,000 or less.

### Claim 4 (depends on 1)

The aqueous ink according to claim 1, wherein the polyhydric alcohol comprises a sorbitol.

### Claim 5 (depends on 1)

The aqueous ink according to claim 1, wherein a content (% by mass) of the polyhydric alcohol derivative is 0.5% by mass or more to 4.0% by mass or less with respect to a total mass of the ink.

### Claim 6 (depends on 1)

The aqueous ink according to claim 1, wherein a content (% by mass) of the first water-soluble organic solvent is 0.5 times or more to 10.0 times or less as large as a content (% by mass) of the polyhydric alcohol derivative in terms of a mass ratio.

### Claim 7 (depends on 1)

The aqueous ink according to claim 1, wherein the first water-soluble organic solvent is a compound that is solid at 25° C.

### Claim 8 (depends on 1)

The aqueous ink according to claim 1, further comprising a resin particle.

### Claim 9 (depends on 8)

The aqueous ink according to claim 8, wherein the resin particle has an acid group, and
wherein an introduction amount of the acid group of the resin particle is 120 μmol/g or more to 250 μmol/g or less.

### Claim 10 (depends on 1)

An ink cartridge comprising an ink and an ink storage portion storing the ink, wherein the ink comprises the aqueous ink according to claim 1.

### Claim 11 (depends on 1)

An ink jet recording method for recording an image on a recording medium by ejecting an ink from an ink jet recording head, wherein the ink comprises the aqueous ink according to claim 1.

### Claim 12 (depends on 1)

The aqueous ink according to claim 1, wherein a content (% by mass) of the pigment is 0.5% by mass or more to 15.0% by mass or less with respect to a total mass of the ink.

### Claim 13 (depends on 1)

The aqueous ink according to claim 1, wherein a content (% by mass) of the first water-soluble organic solvent is 0.5% by mass or more to 40.0% by mass or less with respect to a total mass of the ink.

### Claim 14 (depends on 1)

The aqueous ink according to claim 1, wherein the first water-soluble organic solvent that is solid at 25° C. comprises at least one of trimethylolpropane and polyethylene glycol having a number-average molecular weight of 600.