The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2013
Filed:
Oct. 09, 2008
Waifong Liew Anton, Wilmington, DE (US);
Waifong Liew Anton, Wilmington, DE (US);
E I du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
The present disclosure pertains to an aqueous ink jet ink having improved corrosion resistance for use in an ink jet print head including: (a) a colorant; (b) an aqueous vehicle; and (c) a certain random hydrophilic polymer additive, wherein the random hydrophilic polymer additive includes a random copolymer consisting of a hydrophilic component and an optional hydrophobic component, wherein the hydrophobic component includes a monomer selected from the group consisting of methyl acrylate and/or vinyl acetate and/or a hydrophobic monomer having a carbon to oxygen ratio of at least about 2.5, and wherein the hydrophobic component has a concentration of less than about 40% by weight, based on the weight of the polymer additive, and the hydrophilic component includes at least one non-acidic hydrophilic monomer having a carbon to oxygen ratio of less than about 2.5, and a monomer with an ionizable acidic group with a carbon to oxygen ratio of less than about 2.5 present in the amount of at least 10%, based on the weight of the polymer additive; and wherein the ink jet print head includes an ink flow passage, at least a portion of which is formed of nickel-containing metal such as nickel or nickel alloy.