Patent ID: 6080813
Filing Date: 2000-06-27
Classification: C04B,C08B,C08F,C08L,D21H

Abstract:
An aqueous polymer dispersion obtained by free-radical polymerization of a mixture of unsaturated monomers which comprises at least one starch-degradation product which is obtained by a process consisting of hydrolysis of a native starch in the aqueous phase, wherein the starch-degradation product is water-soluble at room temperature and has a weight average molecular weight Mw of from 4,000 to 16,000, wherein the starch-degradation product is present in an amount of from 20 to 60% by weight, based on the amount of polymerized monomers,wherein said mixture of unsaturated monomers consist essentially of:from 39 to 69% by weight of at least one ester of .alpha.,.beta.-monoethylenically unsaturated mono- and dicarboxylic acid having 3 to 6 carbon atoms with alkanols having 1 to 6 carbon atoms,from 30 to 60% by weight of styrene,from 1 to 10% by weight of at least one monomer selected from the group consisting of .alpha.,.beta.-monoethylenically unsaturated carboxylic acids having 3 to 6 carbon atoms, and amides and nitrites thereof, andfrom 0 to 10% by weight of one or more monomers selected from the group consisting of alkylolamides of .alpha.,.beta.-monoethylenically unsaturated carboxylic acids having 3 to 6 carbon atoms, with 1 to 4 carbon atoms in the alkyl group, and monomers having up to 25 carbon atoms and containing two non-conjugated, ethylenically unsaturated double bonds.