Patent ID: 6534566
Filing Date: 2003-03-18
Classification: C09B,C09D

Abstract:
An ink jet ink composition comprising water, a humectant, and a water-dispersible polymeric latex having contained therein a practically water-insoluble delocalized cationic azo dye which has solubility in water less than about 0.1 g/l at 25Â° C. and solubility in organic solvents greater than or equal to about 0.2 g/l and is derived from the quaternization of a nitrogen heterocyclic azo dye wherein said delocalized cationic azo dye has the following formula: wherein:Z represents the atoms necessary to complete a nitrogen-containing heterocyclic ring containing 2 or 3 nitrogen atoms and the balance carbon atoms; R1 and R2 each independently represents hydrogen or a substituted or unsubstituted alkyl group of 1 to about 6 carbon atoms; R4, R5 and R6 each independently represents the same substituents as R1 and R2, halogen, cyano, substituted or unsubstituted alkoxy, acyl, benzoyl or alkoxycarbonyl; with the proviso that at least one of R4, R5 and R6 represents a substituted or unsubstituted alkyl group of 1 to about 6 carbon atoms attached to a nitrogen atom; R3 represents the same groups as R4, R5 and R6; hydroxy; a polyoxyalkylene group of 2-20 alkylene oxide residues; carboxy or sulfo or phospho ester; carbamoyl; substituted or unsubstituted alkyl-, aryl-aralkyl-, diaryl- or dialkyl-carbamoyl of 1 to about 20 carbon atoms; sulfamoyl; substituted or unsubstituted alkyl-, aryl-, aralkyl-, diaryl- or dialkyl-sulfamoyl of 1 to about 20 carbon atoms; acylamino; sulfonylamino; amino; a substituted or unsubstituted alkyl-, aryl-, aralkyl-, diaryl- or dialkylamino- of 1 to about 20 carbon atoms; or a quaternary ammonium or phosphonium group; or may be combined with R2 to form a carbocyclic or heterocyclic 5 or 6 membered ring; n is 1 except when Z represents the atoms necessary to complete a nitrogen-containing heterocyclic ring containing 3 nitrogen atoms, in which case n is 0; and X represents a counterion of BF4âˆ’, OTsâˆ’, PF6âˆ’, C12H25,SO3âˆ’ or ClO4âˆ’; with the proviso that when Z represents the atoms necessary to complete a nitrogen-containing heterocyclic ring of 3 nitrogen atoms, then R3 is combined with R2 to form a carbocyclic or heterocyclic 5 or 6 membered ring.