Patent ID: 6136081
Filing Date: 2000-10-24
Classification: 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 ink-receptive substrates;C) loading said printer with an ink jet ink composition comprising a humectant in an amount of up to about 70% by weight of the composition, and from about 0.5% to about 30% by weight of a co-milled mixture of Pigment Yellow 74 and a pigment having the following structure: ##STR6## wherein: R.sub.1, R.sub.2 and R.sub.5 each independently represents H; a substituted or unsubstituted alkyl group of 1 to about 10 carbon atoms; a substituted or unsubstituted aryl group of about 6 to about 10 carbon atoms; or a substituted or unsubstituted hetaryl group of about 5 to about 10 atoms;R.sub.3 and R.sub.4 each independently represent the groups listed above for R.sub.1, R.sub.2 and R.sub.5 ; a substituted or unsubstituted alkoxy group of 1 to about 10 carbon atoms; a substituted or unsubstituted aryloxy group of 6 to about 10 carbon atoms; a substituted or unsubstituted alkoxycarbonyl group; an alkyl dialkyl-, aryl-, diaryl-, or arylalkyl-carbamoyl group; an alkyl-, dialkyl-, aryl-, diaryl-, or arylalkyl-sulfamoyl group; an acylamino group; a sulfonylamido group; an alkyl-, dialkyl-, aryl-, diaryl-, or arylalkyl-amino group; or a ureido group;with the proviso that only one of R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 is not H; andD) printing on an ink-receptivc element using said ink jet ink in response to said digital data signals.