Patent ID: 8481648

Claim:
A process for the preparation of cationically stabilized and water-redispersible polymer powder compositions, comprising polymerizing one or more ethylenically unsaturated monomers by free-radical polymerization in an aqueous medium in the presence of a protective colloid and/or emulsifier selected from the group consisting of non-ionic protective colloids, non-ionic emulsifiers, and mixtures thereof, to form an aqueous polymer dispersion, and then drying the aqueous polymer dispersion thereby obtained after addition of a cationic protective colloid selected from the group consisting of homo- or copolymers of one or more cationic monomers from the group consisting of diallyldimethylammonium chloride (DADMAC), diallyldiethylammonium chloride (DADEAC), (3-methacryloxy)propyl-trimethylammonium chloride (MPTAC), (3-methacryloxy)ethyltrimethylammonium chloride (METAC), (3-methacrylamido)propyltrimethylammonium chloride (MAPTAC), 2-dimethylaminoethyl methacrylate (DMAEMA), and 3-dimethylaminopropylmethacrylamide (DMAPMA) as a drying aid, in an amount of from 0.1 to 20% by weight based on the weight of polymeric constituents of the aqueous polymer dispersion.