Patent ID: 8536245
Filing Date: 2013-09-17
Classification: C01P,C09C,C09D,Y10T

Abstract:
1. An ink composition comprising at least a pigment coated with a water-insoluble polymer as a coloring material, a resin emulsion as an additive, water and a water-soluble organic compound, wherein the weight average molecular weight of the water-insoluble polymer is from 50,000 to 150,000, wherein the resin emulsion comprises a resin comprising a monomer component of the same kind as the monomer component constituting the water-insoluble polymer and having a weight average molecular weight of 1.5 to 4 times that of the water-insoluble polymer, wherein the average particle size of the resin emulsion is from 20 to 200 nm, and wherein the average particle size of pigment particles in the ink composition ranges from 50 to 150 nm.