Patent ID: 8039549
Filing Date: 2011-10-18
Classification: C08F

Abstract:
1. A process for the preparation of an aqueous polymer dispersion, comprising: (i) preparing an aqueous dispersion of at least one lipophilic active substance which is an alkyldiketene and/or an alkenylsuccinic anhydride, and which has a water solubility of not more than 5 g/l (determined at 25° C. and 1013 mbar) and a melting point below 130° C. in a state of an aqueous emulsion which further comprises at least one dispersion stabilizer, whereby an aqueous dispersion of the lipophilic active substance having a mean particle size of not more than 1000 nm is formed; and (ii) combining said aqueous dispersion (i) with a monomer composition which comprises at least 80% by weight of a neutral, monoethylenically unsaturated monomer emulsifiable in water and emulsion polymerizing the monoethylenically unsaturated monomer in the aqueous dispersion of the lipophilic active (i).