Patent ID: 8008391

Claim:
An aqueous pigment dispersion containing carbon black or an organic pigment (P), a (meth)acrylic copolymer (A), a polyoxyethylene/polyoxypropylene block copolymer (B) represented by the following general formula (1), a polyether based polyurethane (C), a basic material and water, wherein a mass ratio of the total of nonvolatile contents of the (meth)acrylic copolymer (A), the polyoxyethylene/polyoxypropylene block copolymer (B) and the polyether based polyurethane (C) to the carbon black or organic pigment (P), (A+B+C)/P, is from 0.3 to 1.6; and that a mass ratio of the (meth)acrylic copolymer (A) to the total of nonvolatile contents of the resin component, A/(A+B+C), is from 0.05 to 0.45: HO—(C 2 H 4 O) a —(C 3 H 6 O) b —(C 2 H 4 O) c —H (General Formula 1) wherein each of a, b and c represents an integer.