Patent ID: 8470120

Claim:
A spray-dried water-redispersible polymer powder composition comprising as a first component, a polymer of at least one monomer selected from the group consisting of vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylic esters and acrylic esters of alcohols having from 1 to 15 carbon atoms, vinylaromatics, olefins, dienes and vinyl halides and, as a second component one or more silanes of the general formula (RO) 3−n R 1 n SiR 2 X (1), where R is a substituted or unsubstituted alkyl, aryl or alkoxyalkyl radical having from 1 to 10 carbon atoms, R 1 is a substituted or unsubstituted hydrocarbon radical having from 1 to 12 carbon atoms, R 2 is a substituted or unsubstituted alkylene radical having from 1 to 20 carbon atoms in which nonadjacent methylene units can be replaced by —O— groups, X is an amino radical NHR 3 or an epoxy radical CR 4 (O)CR 5 R 6 , where R 3 is hydrogen or a substituted or unsubstituted alkyl, aryl or aminoalkyl radical having from 1 to 10 carbon atoms and n is 0, 1, 2 or 3 and R 4 , R 5 , R 6 are each hydrogen or a substituted or unsubstituted alkyl or aryl radical having from 1 to 10 carbon atoms, wherein after polymerization an aqueous dispersion of the polymer is obtained, wherein the silane (1) is added to the aqueous dispersion of the polymer after conclusion of polymerization and before spray drying, to form an aqueous mixture and the aqueous mixture is then spray dried to form the water-redispersible polymer powder.