Patent ID: 6969444
Filing Date: 2005-11-29
Classification: D21H

Abstract:
1. A process comprising applying a composition comprising at least one addition polymer or copolymer comprised of polymerized units of: from 1 to 100 parts by weight of N-vinylformamide, from 0 to 10 parts by weight of at least one water-soluble cationic monomer, from 0 to 30 parts by weight of at least one monoethylenically unsaturated carboxylic acid monomer unit selected from the group consisting of acrylic acid, methacrylic acid, dimethylacrylic acid, ethacrylic acid, maleic acid, citraconic acid, methylenemalonic acid, allylacetic acid, vinylacetic acid, crotonic acid, fumaric acid, mesaconic acid, itaconic acid and the water soluble salts thereof, and from 0 to 90 parts by weight of an additional water-soluble vinyl monomer, and one or more optical brighteners to paper, wherein the stated amount of units of N-vinylformamide is sufficient to achieve an increased brightening effect of the paper and an increased dry and wet strength of the paper.