Patent ID: 6890975

Claim:
In a hydraulically settable inorganic binder-based construction adhesive which is cementitious or cement-free, in which an aqueous polymer dispersion or redispersible polymer powder is added, the improvement comprising adding as at least a portion of said aqueous polymer dispersion or redispersible polymer powder, a polymer prepared by emulsion polymerization in the presence of a protective colloid, said polymer prepared from monomers comprising at least one vinyl ester monomer and from 0.2 to 1.5 weight percent, based on the total weight of all monomers, of an auxiliary monomer having a water solubility higher than vinyl acetate, wherein said cementitious construction adhesives comprises from 5 to 80 weight percent cement, from 5 to 80 weight percent of filler, and from 0.5 to 60 weight percent protective colloid stabilized polymer solids wherein said protective colloid is a partially hydrolyzed polyvinyl alcohol having a degree of hydrolysis less than or equal to 95 mol percent, and wherein said weight percents of cement, filler, and protective colloid stabilized polymer solids are based on the total weight of said construction adhesive.