Patent ID: 6464767
Filing Date: 2002-10-15
Classification: C09B,C09D

Abstract:
An ink jet printing method, comprising the steps of:A) providing an ink jet printer that is responsive to digital data signals; B) loading said printer with an ink jet recording element comprising a support having thereon an image-receptive layer capable of accepting an ink jet image; C) loading said printer with an ink jet ink composition comprising water, a humectant and a water-soluble pyrazoleazoindole dye; and D) printing on said ink jet recording element using said ink jet ink in response to said digital data signals; wherein said water-soluble pyrazoleazoindole dye may be represented by the following structure: wherein:R1 and R3 each independently represents hydrogen, a substituted or unsubstituted alkyl group of 1-6 carbon atoms, a substituted or unsubstituted allyl group, a substituted or unsubstituted aryl group of 6-10 carbon atoms, a substituted or unsubstituted heteroaryl group of 5-10 atoms or a polyoxyalkylene group of 2-20 alkylene oxide residues; R2, X and Y each independently represents the groups listed above for R1, halogen, cyano, carboxy, acyl, nitro, sulfo, a substituted or unsubstituted alkoxy group of 1-6 carbon atoms, a substituted or unsubstituted aryloxy group of 6-10 carbon atoms, a substituted or unsubstituted alkoxy- or aryloxy-carbonyl group of 1-10 carbon atoms, a polyoxyalkylene group of 2-20 alkylene oxide residues, a ureido group, carbamoyl, a substituted or unsubstituted alkyl-, arylalkyl-, aryl-, diaryl- or dialkyl-carbamoyl group of 1-20 carbon atoms, sulfamoyl, a substituted or unsubstituted alkyl-, arylalkyl-, aryl-, diaryl- or dialkyl-sulfamoyl group of 1-20 carbon atoms, acylamino, sulfonylamino, amino, or a substituted or unsubstituted alkyl-, aralkyl-, aryl-, diaryl- or dialkyl-amino group of 1-20 carbon atoms; n represents an integer from 1-4; and Z represents cyano, carboxy, sulfo, alkoxycarbonyl, carbamoyl or a substituted or unsubstituted alkyl-, arylalkyl-, aryl-, diaryl- or dialkyl-carbamoyl group of 1-20 carbon atoms; with the proviso that the dye must contain at least one group capable of imparting water solubility at a pH of about 4-9.