Patent ID: 7683108

Claim:
A microencapsulated pigment comprising a plurality of pigment particles, each of the pigment particles having a hydrophilic group on the surface thereof and being coated with a polymer to form a polymer coating, wherein the polymer is prepared by polymerizing at least one of a polymerizable surface active agent having a hydrophilic group, a hydrophobic group and a polymerizable group, and a hydrophilic monomer in the presence of a polymeric azo initiator comprising a repeating unit represented by formula (I): wherein D represents a portion having at least a hydrophobic segment; L 1 and L 2 , which may be the same or different, each represent a linking group; R 1 , R 2 , R 3 , and R 4 each represent an alkyl group having 1 to 4 carbon atoms or a cyano group; and n represents an integer of 1 or greater.