Patent ID: 7851521

Claim:
A hydrophobicizing, water-redispersible polymer powder comprising: a) a polymer prepared from monomers comprising a1) from 50 to 90 parts by weight of vinyl acetate monomer units, a2) from 5 to 50 parts by weight of vinyl ester monomer units derived from vinyl esters of alpha-branched monocarboxylic acids having up to 20 carbon atoms inclusive, a3) from 1 to 30 parts by weight of (meth)acrylic ester monomer units derived from alcohols having from 1 to 15 carbon atoms, a4) from 1 to 40 parts by weight of vinyl ester monomer units derived from long-chain unbranched monocarboxylic acids having from 10 to 20 carbon atoms, a5) from 0 to 20 parts by weight of ethylene units, a6) optionally, up to 10 parts by weight of auxiliary monomer units, wherein the parts by weight of monomeric units a1) through a6) of polymer a) add up to 100 parts by weight, b) from 0.5 to 30% by weight of one or more, water-soluble protective colloids, c) from 0 to 20% by weight of organosilicon compound(s), d) from 0 to 20% by weight of fatty acid(s) or derivatives thereof, and e) from 0 to 30% by weight of antiblocking agent, where the % by weight data are based on the total weight of the polymer a).