| abstract |
The invention relates to a hydrophobing additive in the form of a powder that is redispersible in water or an aqueous dispersion containing a) one or several water-insoluble, film-forming basic polymers based on homopolymers or mixed polymers of one or several monomers from the group comprising vinyl ester of linear or branched alkyl carboxylic acids with 1 to 15 C atoms, methacrylic acid ester and acrylic acid ester of alcohols with 1 to 15 C atoms, vinyl aromatic compounds, olefins, dienes, and vinyl halides, b) one or several hydrophobic compounds from the group comprising organosilicon compounds, fatty acids and the fatty acid derivatives thereof, and hydrocarbon waxes, as well as c) one or several protective colloids. The inventive hydrophobing additive is characterized in that the concentration of component b) is greater than 30 percent by weight relative to the total weight of component a). |