Patent ID: 7678844

Claim:
A system for printing images on a substrate, comprising: a) an ink-jet ink including: i) a liquid vehicle including water, and from 5 wt % to 35 wt % total organic solvent content, wherein the organic solvent content includes at least three of 1,5-pentanediol, ethoxylated glycerol, 2-pyrrolidinone, and 2-methyl-1,3-propanediol; ii) from 0.1 wt % to 6 wt % of acid-functionalized pigment solids; iii) from 0.001 wt % to 6 wt % of styrene-maleic anhydride copolymer, said styrene-maleic anhydride copolymer having a weight average molecular weight from about 400 Mw to 15,000 Mw. b) a printhead loaded with the ink-jet ink and configured for jetting the ink-jet ink at a firing frequency from 12 kHz to 25 kHz, and wherein the frequency response range for the ink-jet ink is such that the ink-jet ink is jettable at from 3 kHz to 25 kHz.