# US 2014/0198150 A1 · Ink for ink jet recording apparatuses and image forming method

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- Number: US 2014/0198150 A1
- Document ID: US20140198150A1
- Status: Published application
- Kind: A1
- Application number: 14/150,540
- Filed: 2014-01-08
- Published: 2014-07-17
- Earliest claimed: 2013-01-11
- Assignees: KYOCERA Document Solutions Inc.
- Applicants: Kyocera Document Solutions Inc.
- Inventors: Noriaki OZAWA
- Web page: https://patentgrep.com/patent/US20140198150A1

## CPC

- 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)

## Abstract

An ink for ink jet recording apparatuses contains water and a pigment dispersion containing a resin and carbon black. The ink additionally contains a surfactant including a compound expressed by the general formula (I) below, and the mass average molecular weight of the resin, the DBP oil absorption of the carbon black, the content of the resin with respect to the content of the carbon black in the pigment dispersion, and the dried-by-evaporation viscosity V40, which is the viscosity of the ink at the dryness of 40% by mass, are all within the respective predetermined ranges.

## Claims

### Claim 1

An ink for inkjet recording apparatuses, comprising:
water; a pigment dispersion; and a surfactant including a compound expressed by the general formula (I) below,
wherein the pigment dispersion includes a resin and carbon black,
a mass average molecular weight of the resin is from 10,000 to 40,000,
a DBP oil absorption of the carbon black is from 40 g/100 g to 80 g/100 g,
a content of the resin in the pigment dispersion is from 30% by mass to 60% by mass with respect to a content of the carbon black,
a dried-by-evaporation viscosity of the ink is 50 mPa·s or less, the dried-by-evaporation viscosity defining a viscosity of the ink at a dryness of 40% by mass,
wherein in the general formula (I),
R1 represents CAH2A+1,
R2 represents C1-BH2B+1,
A and B each represent an integer 1 or larger,
A+B represents an integer from 6 to 10,
-E-O— represents —CH2CH2—O—,
—P—O— represents —CH2CH(CH3)—O—,
n and m each represents a positive number,
n+m represents a number from 5 to 11,
n>m is satisfied, and
a repetitive sequence of (-E-O—) and (—P—O—) is either a random sequence or a block sequence.

### Claim 2 (depends on 1)

An ink for inkjet recording apparatuses according to claim 1, wherein
a content of the surfactant is from 0.05% by mass to 0.5% by mass with respect to a total mass of the ink.

### Claim 3 (depends on 1)

An ink for inkjet recording apparatuses according to claim 1, wherein
a content of the carbon black is from 4% by mass to 8% by mass with respect to the total mass of the ink.

### Claim 4 (depends on 1)

An image forming method for forming an image by an inkjet recording apparatuses by using an ink for inkjet recording apparatuses according to claim 1.

### Claim 5 (depends on 4)

An image forming method according to claim 4, wherein
the image is formed without heating a recording medium.

### Claim 6 (depends on 4)

An image forming method according to claim 4, wherein
the inkjet recording apparatus is of a linehead recording type.