# US 2014/0192111 A1 · Ink, ink cartridge, and ink jet recording method

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- Number: US 2014/0192111 A1
- Document ID: US20140192111A1
- Status: Published application
- Kind: A1
- Application number: 14/236,321
- Filed: 2013-05-07
- Published: 2014-07-10
- Earliest claimed: 2012-05-09
- Assignees: Canon Kabushiki Kaisha
- Applicants: Canon Kabushiki Kaisha
- Inventors: Souichi Nagai; Masashi Ogasawara; Keigo Gouda; Fumiaki Fujioka; Akiko Yasuda
- Web page: https://patentgrep.com/patent/US20140192111A1

## CPC

- C09D 11/322: Pigment inks
- B41J 2/2107: {characterised by the ink properties (supplying ink in a solid state B41J2/17593)}
- C09D 11/32: characterised by colouring agents
- C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes
- 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

## Abstract

The present invention provides an ink that can achieve image characteristics for recording an image having excellent optical density, bleeding resistance, and white blur resistance and also can achieve reliability that provides excellent sticking resistance to a recording head. The ink is one for ink jet containing a first pigment and second pigment. The first pigment is a self-dispersible pigment to a surface of a particle of which a first functional group containing a phosphonic acid group is bonded. The second pigment is a self-dispersible pigment to a surface of a particle of which a second functional group not containing a phosphonic acid group but containing an anionic group other than the phosphonic acid group, and further containing another atomic group is bonded. The introduced amount of the functional group of the second pigment is 0.25 mmol/g or more.

## Claims

### Claim 1

An ink for ink jet, comprising a first pigment and a second pigment, wherein
the first pigment is a self-dispersible pigment to a surface of a particle of which a first functional group containing a phosphonic acid group is bonded; the second pigment is a self-dispersible pigment to a surface of a particle of which a second functional group not containing a phosphonic acid group but containing an anionic group other than the phosphonic acid group, and further containing another atomic group is bonded; and
the introduced amount of the functional group of the second pigment is 0.25 mmol/g or more,
wherein the introduced amount of the functional group of the first pigment is 0.10 mmol/g or more and 0.33 mmol/g or less.

### Claim 2 (depends on 1)

The ink according to claim 1, wherein the mass ratio of the content (% by mass) of the first pigment based on the total mass of the ink to the content (% by mass) of the second pigment based on the total mass of the ink is 0.4 times or more and 4.0 times or less.

### Claim 3 (depends on 1)

The ink according to claim 1, wherein the first functional group contains two phosphonic acid groups.

### Claim 4 (depends on 1)

The ink according to claim 1, wherein the second functional group is represented by —R1—(COOM1)n (wherein, R1 represents an alkylene group or an arylene group; M1 represents a hydrogen atom, an alkali metal, ammonium, or an organic ammonium; and n represents an integer of 1 or more).

### Claim 5

(canceled)

### Claim 6 (depends on 1)

The ink according to claim 1, wherein the introduced amount of the functional group of the first pigment is equal to or less than the introduced amount of the functional group of the second pigment.

### Claim 7 (depends on 1)

The ink according to claim 1, the ink further comprising a salt constituted by combining a cation and an anion, wherein
the cation is at least one selected from the group consisting of alkali metal ion, ammonium ion and organic ammonium ion;
the anion is at least one selected from the group consisting of Cl−, Br−, I−, ClO−, ClO2−, ClO3−, ClO4−, NO2−, NO3−, SO42−, CO32−, HCO3−, HCOO−, (COO−)2, COOH(COO−), CH3COO−, C2H4(COO−)2, C6H5COO−, C6H4(COO−)2, PO43−, HPO42− and H2PO4−; and
the value obtained by multiplying the concentration of the anion of the salt in the ink by the valence number of the anion is 0.005 mol/L or more and 0.06 mol/L or less.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

An ink jet recording method comprising the step of recording an image on a recording medium by ejecting an ink from a recording head of an ink jet system, wherein
the ink comprises the ink according to claim 1.

### Claim 10 (depends on 1)

The ink according to claim 1, wherein the anionic group of the second functional group is at least one of a carboxylic acid group and a sulfonic acid group.

### Claim 11 (depends on 1)

The ink according to claim 1, wherein the introduced amount of the functional group of the second pigment is 0.40 mmol/g or more.

### Claim 12 (depends on 1)

The ink according to claim 1, wherein the introduced amount of the functional group of the second pigment is 1.00 mmol/g or less.