# US 7,745,510 B2 · Ink composition for ink jet recording, and recording method and recorded matter using the same

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- Number: US 7,745,510 B2
- Document ID: US7745510B2
- Status: Granted
- Kind: B2
- Application number: 11/393,010
- Filed: 2006-03-29
- Published: 2006-10-26
- Granted: 2010-06-29
- Earliest claimed: 2005-03-29
- Assignees: Seiko Epson Corporation
- Inventors: Chie Saito
- Web page: https://patentgrep.com/patent/US7745510B2

## CPC

- 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

The invention provides an ink composition for ink jet recording comprising at least a resin emulsion and a surface-treated pigment, wherein the amount of monomers and oligomers with a molecular weight of 2,000 or less contained in the resin emulsion is 1,000 ppm or less based on the total amount of the ink composition. Also disclosed are an ink jet recording method using the ink composition and recorded matter obtained by the recording method.

## Claims

### Claim 1

An ink composition for ink jet recording comprising at least a resin emulsion and a surface-treated pigment, wherein the amount of monomers and oligomers with a molecular weight of 2,000 or less contained in the resin emulsion is 1,000 ppm or less based on the total amount of the ink composition, wherein the content of the resin emulsion is within the range of 1 to 10% by weight based on the total amount of the ink composition, wherein the surface-treated pigment is a surface-treated pigment which is dispersed by a carboxyl group existing on a surface of the pigment and without a dispersing agent, and wherein the resin emulsion is present in the ink composition in an amount such that the ink composition has good fixing and storage properties in accordance with the following criteria:
(a) when a pattern including printed letters is printed with the ink to form a recorded matter and the recorded matter is air dried for 24 hours, the printed letters do not smudge when rubbed twice with a water-based yellow fluorescent pen; and
(b) when sixty grams of the ink composition is hermetically sealed in a 100-g bottle and left to stand at 70 C for 1 week, the viscosity of the ink composition before and after standing changes at a rate of less than +/−5% as measured with an oscillating viscometer.

### Claim 2 (depends on 1)

The ink composition according to claim 1, wherein the resin emulsion contains at least one monomer selected from the group consisting of an alkyl (meth)acrylate and an aromatic vinyl compound, as a copolymerization monomer(s).

### Claim 3 (depends on 1)

The ink composition according to claim 1, wherein the surface-treated pigment is a surface treated carbon black.

### Claim 4 (depends on 1)

The ink composition according to claim 1, wherein the surface-treated pigment has an average particle size ranging from 100 to 200 nm.

### Claim 5 (depends on 1)

The ink composition according to claim 1, wherein the content of the surface-treated pigment is within the range of 2 to 15% by weight based on the total amount of the ink composition.

### Claim 6 (depends on 1)

An ink jet recording method comprising ejecting droplets of an ink and depositing the droplets on a recording medium to perform printing, wherein the ink is the ink composition according to claim 1.

### Claim 7 (depends on 6)

Recorded matter recorded by the ink jet recording method according to claim 6.