Patent ID: 6802939
Filing Date: 2004-10-12
Classification: D21H

Abstract:
A method of sizing paper or paper board by applying a composition (A) to at least one of,i) the surface of a formed paper or paper board sheet, ii) a paper or paper board making cellulosic suspension prior to draining, wherein the composition (A) comprises an aqueous dispersion of polymeric particles of particle size up to 1 micron, wherein the polymeric particles comprise a water insoluble polymer matrix, comprised of ethylenically unsaturated monomer or ethylenically unsaturated monomer blend, wherein an oligomer formed from a monomer blend comprising,(a) (meth)acrylamide, (b) an organic mercaptan or organic sulphone, and (c) an ethylenically unsaturated monomer comprising either a tertiary amine group or a quaternary ammonium group is located at the surface of the polymer particles.