Patent ID: 7074843
Filing Date: 2006-07-11
Classification: B01J,C01P,C09B,C09C,C09D,Y10T

Abstract:
1. A process for producing a microencapsulated pigment, comprising coating pigment particles having a hydrophilic group on the surface thereof with a polymer, wherein said hydrophilic group on the surface of the pigment particles is an anionic group and the coating step comprises the steps of: (a) mixing a polymerization initiator having a cationic group with an aqueous dispersion having dispersed therein the pigment particles having the anionic group under a condition that does not activate said polymerization initiator; (b) adding a hydrophilic monomer, a surface active agent and, optionally, a comonomer copolymerizable with said hydrophilic monomer to the dispersion; and (c) activating said polymerization initiator to carry out emulsion polymerization.