Patent ID: 8562122
Filing Date: 2013-10-22
Classification: C09D

Abstract:
1. An aqueous ink jet ink and an ink jet print head combination, wherein the ink jet ink comprises: (a) a colorant; (b) an aqueous vehicle; and (c) a random hydrophilic copolymer additive, wherein the random hydrophilic copolymer additive comprises a random copolymer comprised of a hydrophilic component and an optional hydrophobic component, wherein the hydrophilic component comprises a monomer (X) having an ionizable acidic group and having a carbon to oxygen ratio of less than about 2.5, wherein said monomer (X) is present in the amount of more than 10%, based on the weight of the polymer additive, and at least one non-acidie hydrophilic monomer (Y) having a carbon to oxygen ratio of less than about 2.5, and the hydrophobic component comprises a monomer (Z) selected from the group consisting of methyl acrylate, vinyl acetate, a hydrophobic monomer (W) having a carbon to oxygen ratio of at least about 2,5, and mixtures thereof, and wherein the hydrophobic component has a concentration of from 0% to less than about 40% by weight, based on the weight of the polymer additive; and wherein the ink jet print head comprises an ink flow passage, at least a portion of which is formed of a nickel-containing metal.