Patent ID: 7759411
Filing Date: 2010-07-20
Classification: C09D

Abstract:
1. An ink composition comprising at least a pigment, a polymer which encapsulates the pigment to make the pigment dispersible in the ink composition, a multivalent metal ion and water, wherein the polymer is a vinyl polymer obtained by polymerizing: A) at least one monomer selected from the group consisting of: wherein R wherein R wherein R B) a monomer having a salt-forming group; C) a macromer having a number average molecular weight of 500 to 500,000, wherein the macromer is a styrenic macromer having a polymerizable functional group at one end thereof; and D) a monomer copolymerizable with the monomers A), B) and C), and wherein the multivalent metal ion is calcium and is present in an amount of from 5 to 100 ppm based on the total amount of the ink composition.