AQUEOUS PIGMENT DISPERSION SOLUTION, INK FOR INK-JET RECORDING, AND PROCESS FOR PRODUCTION OF AQUEOUS PIGMENT DISPERSION SOLUTION

摘要

invention is long-term storage stability, high gloss, light resistance of the printed image at the same time feasible ink jet recording ink , and relates to an aqueous pigment dispersion for preparing the ink, also relates to a process for producing the aqueous pigment dispersion. The applicant for the purpose of C.I. Pigment Green 36 (a), a styrene-acrylic acid type copolymer (b), containing the basic compound (c) and the wetting agent (d), a styrene-acrylic acid type copolymer (b) is 60% by weight relative to the total monomer components or more styrene-based monomer unit, having an acid value and a weight average molecular weight of 6000 to 40 000 of from 120 to 240, the mass ratio (b) / (a) is from 0.15 to 0.25 in the range of water-based pigment dispersion, and composed mainly of the aqueous pigment dispersion provides an ink for ink jet recording. Also provides a process for producing an aqueous pigment dispersion having a kneading step of kneading the respective raw materials.