Patent ID: 7435291
Filing Date: 2008-10-14
Classification: C08K,C09D

Abstract:
1. An ink-jet ink composition, comprising: a metallized phthalocyanine dye; and a liquid vehicle carrying the dye, said liquid vehicle including a polyamine selected from the group consisting of N-methyl-1,3-propanediamine, 1,10-phenanthroline, diethylenetriamine, triethylenediamine, N,N-diethylethylenediamine, homopiperazine, piperazine, piperazine-2-carboxylic acid, 1,8-bis-[dimethylamino]naphthalene (proton sponge), N-(2-hydroxyethyl)piperazine-N′-(2-ethane sulfonic acid)(HEPES), 4-(2-hydroxyethyl) piperazine-1-propane sulfonic acid (EPPS), and combinations thereof, said polyamine 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 polyamine.