Abstract: Dry mix formulations containing a redispersible polymer powder (RDP) made of a low carboxylation, large particle size water-insoluble film—forming styrene butadiene polymer having at least one ethylenically unsaturated dicarboxylic acid monomer, and a high alumina content cement such as a calcium aluminate cement (CAC) or a calcium sulfoaluminate cement (CSA) provides cement compositions having unexpectedly superior water immersion shear strength and set time for a cement containing tile adhesive (CBTA or CTA), superior adhesion properties in water proofing mortars or mortar applications, and superior flexural and compressive strength in grout applications.

Abstract: Cement tile adhesives and methods for using them, the adhesives comprising a dry mix of a water-redispersible polymer powder made from a low carboxylation, large particle size water-soluble film-forming vinyl aromatic-diene copolymer latex and a reduced amount of cellulose ether exhibit superior water immersion shear strength and freeze/thaw shear strength.

Abstract: Cement tile adhesives and methods for using them, the adhesives comprising a dry mix of a water-redispersible polymer powder made from a low carboxylation, large particle size water-soluble film-forming vinyl aromatic-diene copolymer latex and a reduced amount of cellulose ether exhibit superior water immersion shear strength and freeze/thaw shear strength.

Abstract: A water redispersible polymer powder is produced by drying an aqueous mixture of a low carboxylation, low Tg, large average particle size water insoluble film-forming polymer latex or emulsion and a colloidal stabilizer. The latex polymer may have an average particle size of 2000 ? to 5,000 ?, and an amount of carboxylation of 0.1% to 2.75% by weight of at least one ethylenically unsaturated dicarboxylic acid, salts or mixtures thereof, based upon the weight of the polymer. Dispersions containing the polymer and a polyvinyl alcohol as a colloidal stabilizer exhibit an unexpectedly low viscosity which facilitates spray drying and permits use of high solids content dispersions with low pressure spray drying to increase production efficiency. Cement compositions such as mortars, which contain the redispersible polymer powder exhibit unexpectedly lower rates of viscosity buildup for better workability or troweling, faster set time, and superior heat flow characteristics.