Patent ID: 7740743
Filing Date: 2010-06-22
Classification: C08F,D21H

Abstract:
1. A method of improving the strength of paper produced in a paper making process which process comprises providing a cellulosic suspension comprising cellulosic fibres and optionally fillers, including a dry strength resin, and then dewatering the cellulosic suspension on a wire or mesh to form a sheet and drying the sheet, in which the dry strength resin is a polymer comprising i) a synthetic polymeric component that has been formed from an ethylenically unsaturated water-soluble or potentially water-soluble monomer and an ethylenically unsaturated monomer carrying a reactive group, wherein the reactive group is directly reactive with a cellulose binding domain protein; and ii) a protein component comprising a cellulose binding domain protein, wherein the cellulose binding domain protein is covalently bonded to the synthetic polymer component through one or more of the reactive groups.