Patent ID: 8133543
Filing Date: 2012-03-13
Classification: B41M

Abstract:
1. A process for improving the printability of paper and a paper product by enhancing the water resistance of ink-jet printed images, wherein said process comprises treating the paper or the paper product with an aqueous solution comprising a cationic polymer, wherein the cationic polymer is a hydrolyzed homopolymer of N-vinylformamide having a degree of hydrolysis of 50-100% and comprises positive charge providing units, has a charge density of at least 3 meq/g and is used as the sole treatment composition in the aqueous solution, wherein said composition is applied in an amount of from 0.05 g/m 2 to 5 g/m 2 to the surface of the paper or the surface of the paper product, and wherein after the treatment with the cationic polymer the treated paper or paper product is not coated.