Patent ID: 7956113

Claim:
A hydrophobicizing additive in the form of a water-redispersible powder comprising: a) one or more water-insoluble, film-forming base polymers selected from the group consisting of vinyl acetate homopolymers; copolymers of vinyl acetate with from 1 to 40% by weight of ethylene; copolymers of vinyl acetate with from 1 to 40% by weight of ethylene and from 1 to 50% by weight of one or more further comonomers selected from the group consisting of vinyl esters having from 1 to 15 carbon atoms in the carboxylic acid radical, copolymers of vinyl acetate, from 1 to 40% by weight of ethylene and 1 to 60% by weight of acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms, copolymers comprising from 30 to 75% by weight of vinyl acetate, from 1 to 30% by weight of vinyl laurate or the vinyl ester of an alpha-branched carboxylic acid having from 9 to 13 carbon atoms, and from 1 to 30% by weight of acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms, and further comprising from 1 to 40% by weight of ethylene; copolymers comprising vinyl acetate, from 1 to 40% by weight of ethylene and from 1 to 60% by weight of vinyl chloride, (meth)acrylic ester polymers, styrene-acrylic ester copolymers, vinyl acetate-acrylic ester copolymers, and styrene-1,3-butadiene copolymers, b) one or more hydrophobic compounds selected from the group consisting of organosilicon compounds, fatty acids, fatty acid derivatives, and hydrocarbon waxes, and c) one or more protective colloids, wherein component b) is present in an amount of 100% to 500% by weight based on the weight of component a).