Patent ID: 7976623
Filing Date: 2011-07-12
Classification: C09D

Abstract:
1. An ink-jet ink composition, comprising: a dye; and a liquid vehicle carrying the dye, said liquid vehicle including a sulfonated aromatic compound selected from the group consisting of 6,7-dihydroxy-2-naphthalene-sulfonic acid, 6-amino-1-naphthol-3-sulfonic acid, 6-amino-4-hydroxy-2-naphthalene-sulfonic acid, naphthalene-2-sulfonic acid, 8-amino-1-naphthol-3,6-disulfonic acid, 1-amino-2-naphthol-4-sulfonic acid, 4,5-dihydroxy-1,3-benzenedisulfonic acid, 1,3-benzenedisulfonic acid, anthraquinone-2-sulfonic acid, and mixtures and salts thereof, present in the ink-jet ink at an effective concentration to cause improvement of ozone fastness of said ink-jet ink, wherein the improvement is determined by comparing the ozone fastness of the ink-jet ink with a control ink-jet ink that does not include the sulfonated aromatic compound.