# US 8,465,580 B2 · Aqueous ink composition and urethane resin composition for aqueous ink composition

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- Number: US 8,465,580 B2
- Document ID: US8465580B2
- Status: Granted
- Kind: B2
- Application number: 13/166,164
- Filed: 2011-06-22
- Published: 2011-11-17
- Granted: 2013-06-18
- Earliest claimed: 2005-02-18
- Assignees: Seiko Epson Corporation
- Applicants: Takeshi Tanoue; Tsuyoshi Sano
- Inventors: Takeshi Tanoue; Tsuyoshi Sano
- Web page: https://patentgrep.com/patent/US8465580B2

## CPC

- C09D 11/40: Ink-sets specially adapted for multi-colour inkjet printing
- 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 object of the present invention is to provide a black ink composition by which a recorded matter in which a fine surface defect on a recorded matter is effectively suppressed, can be obtained. For this object, the present invention is a black ink composition containing water, carbon black, and a water-soluble polyurethane resin, wherein when a content of carbon black is not less than 0.4% by weight and less than 1.5% by weight, a content of a solid matter of the water-soluble polyurethane resin is not less than 0.67-fold and not more than 2.5-fold a content of the carbon black and, when a content of the carbon black is less than 0.4% by weight, a content of a solid matter of the water-soluble polyurethane resin is not less than 7.5-fold a content of the carbon black.

## Claims

### Claim 1

An ink set comprising a first black ink composition comprising water, a water-soluble polyurethane resin and carbon black, wherein the content of the carbon black is not less than 0.4% by weight and less than 1.5% by weight, and the content of solid matter of the water-soluble polyurethane resin is not less than 0.2% by weight and not more than 4% by weight, wherein the ink set contains a second black ink composition comprising a water-soluble polyurethane resin, water and carbon black, wherein the content of the carbon black of the second black ink composition is less than 0.4% by weight, and a content of a solid matter of the water-soluble polyurethane resin of the second black ink composition is not less than 1% by weight and not more than 10% by weight, wherein the solid matter of the water-soluble polyurethane resin of the second black ink composition is at least 7.5-fold the content of the carbon black of the second black ink composition, wherein the solid matter of the water-soluble polyurethane resin of the second black ink composition is 2-fold or more the solid matter of the water-soluble polyurethane resin of the first black ink composition.

### Claim 2 (depends on 1)

The ink set according to claim 1, wherein the first black ink composition contains a fine particle emulsion, and a content of the solid matter of the water- soluble polyurethane resin is not less than 40% by weight and not more than 80% by weight of a total amount of solid matters of the water- soluble polyurethane resin and the fine particle emulsion.

### Claim 3 (depends on 2)

The ink set according to claim 2, wherein the fine particle emulsion includes a polyalkylene-based resin.