Patent ID: 6300403
Filing Date: 2001-10-09
Classification: C08F

Abstract:
A process for preparing protective-colloid-stabilized polymers in the form of their aqueous polymer dispersions or of their water-redispersible powders by emulsion polymerization of one or more ethylenically unsaturated monomers in the presence of protective colloid and, optionally, drying the resultant polymer dispersions, which comprises polymerizing one or more monomers selected from the group consisting of vinylaromatic compounds, 1,3-dienes and acrylates and methacrylates of alcohols having from 1 to 15 carbon atoms in the presence of a protective colloid combination made from one or more protective colloids selected from the group consisting of hydrophobically modified, partially hydrolyzed polyvinyl esters which as 2% strength aqueous solution produce a surface tension of .ltoreq.40 mN/m, and made from one or more protective colloids which as 2% strength aqueous solution produce a surface tension of >40 mN/m.