Patent ID: 9580591
Date: 2017-02-28
CPC Classifications: C04B,C08F,C08K,C08L,C09D,C09J

Claim:
1. A process for preparing a water-redispersible polymer powder composition, comprising: A) providing a first aqueous dispersion comprising particles of at least one base polymer comprising polymerized ethylenically unsaturated compounds, and B) adding to the aqueous dispersion A), at least one hybrid copolymer protective colloid as a drying aid to form a second aqueous dispesion comprising the base polymer and the hybrid copolymer protective colloid, and C) drying the second aqueous dispersion from step B) to obtain a water-redispersible polymer powder, wherein the hybrid copolymer protective colloid is obtained by a) free-radically initiated polymerizing or one or more condensation products of silicon compounds of the formula (1), where R is an optionally substituted alkyl radical, having 1 to 20 carbon atoms, an aryl radical, or hydrogen, R n is from 1 to 4.