Patent ID: 6841591
Filing Date: 2005-01-11
Classification: C09D

Abstract:
1. A method for stabilizing a dye in an ink comprising said dye and a vehicle, said ink intended for printing on a print medium, said method comprising: (a) providing at least one dye moiety in a reactive monomeric form that is insoluble in water; (b) providing at least one photostabilizing additive in reactive monomeric form (c) copolymerizing said dye moiety and said photostabilizer with a transparent polymeric matrix thereby forming an encapsulated dye particle that provides a barrier to protect said dye moiety; (d) providing the surface of said encapsulated dye particle with functional groups that either ionically or sterically stabilize dispersion of said encapsulated dye particle; and (e) incorporating said encapsulated dye particle in said ink, wherein said encapsulated dye particles are dispersion-stable and wherein said ink, when printed, forms a film that is waterfast when dried.