Patent ID: 8163820

Claim:
A process for producing an aqueous pigment dispersion for ink-jet recording, comprising: a first step of kneading (1) a styrene-acrylic resin with a styrene monomer unit of 50 to 90 mass %, and at least one unit selected from an acrylic monomer unit and a methacrylic monomer unit, having an acid value of 50 to 300 and a mass average molecular weight of 5,000 to 40,000, (2) a pigment, (3) a basic compound, and (4) a humectant to produce a solid colored kneaded product, and a second step of dispersing the solid colored kneaded product in an aqueous medium comprising water or water and a humectant, wherein the (3) basic compound is an alkali metal hydroxide, and the solid content percentage of the colored kneaded product in the first step is from 50 to 80 mass %.