Patent ID: 9181443
Filing Date: 2015-11-10
Classification: C09D

Abstract:
1. An aqueous pigment dispersion for ink jet recording ink, comprising: a resin produced by copolymerization of a composition that contains (a) one or two or more compounds selected from the group consisting of alkenylsuccinic acids, alkenylsuccinic anhydrides, alkylsuccinic acids, and alkylsuccinic anhydrides, (b) a styrene monomer, (c) a monomer having an αβ-ethylenically unsaturated bond and an anionic group, wherein the (a) component constitutes 5% by mass or more and the (b) component constitutes 30% by mass or more of the total amount of all the monomer component(s) and the (a) component of the composition; 5 to 50% by mass of a pigment; and a basic compound, wherein the aqueous pigment dispersion has a resin/pigment mass ratio of 1/10 to 2/1, wherein the aqueous pigment dispersion is prepared by a method comprising: kneading the resin with the pigment, which is then diluted with an aqueous medium, wherein a pigment particle of the pigment is covered with the resin in the aqueous pigment dispersion, wherein the basic compound neutralizes the anionic group included in the resin.