Patent ID: 6547865
Filing Date: 2003-04-15
Classification: C09D

Abstract:
An ink jet printing process for improving the ozone stability of an ink jet image comprising:a) providing an ink jet recording element comprising a support having thereon a porous image-receiving layer having interconnecting voids; and b) applying droplets of a liquid ink on said image-receiving layer in an image-wise manner, said ink comprising water, humectant and a metallized, phthalocyanine dye, said metallized, phthalocyanine dye comprising the formula: MPc(SO3X)a(SO2NRRâ€²)b wherein:M represents a metal; Pc represents a phthalocyanine nucleus; X represents hydrogen, alkali metal or an organic cation; a is from 0 to2; R represents hydrogen; a substituted or unsubstituted alkyl group having from about 1 to about 15 carbon atoms, a substituted or unsubstituted aryl group, or a substituted or unsubstituted heterocyclic group; Râ€² represents an amino acid radical or at least one substituted or unsubstituted alkyl, aryl or heterocyclic substituent containing a primary, secondary, tertiary or quaternary amino group which may be part of a cyclic ring; and b is from 1 to 4, with the proviso that a+b is an average of from 3 to 4.