Redispersible polymer powder compositions prepared from styrene butadiene-based latex for dry mix formulations

摘要

Redispersible polymer powder compositions which include a polyglycol in admixture with a redispersible polymer powder (RDP), which powder includes a codried mixture of a carboxylated, water insoluble film-forming styrene butadiene polymer and a colloidal stabilizer, results in cement compositions having unexpectedly superior overall bonding strength and adhesion after water immersion. Use of the polyglycol provides good workability or ease of troweling during application. In addition, the RDP composition, which includes the RDP and the polyglycol, provides the cement-based composition with excellent abrasion resistance, surface appearance, and color. Also, the RDP composition provides for at least a 30% reduction, for example a 50% or more reduction in the amount of retarder or retardant employed in the dry mix formulation for cement compositions, such as self leveling flooring compounds or compositions, and cement-based tile adhesives.

主权项

1. A water redispersible polymer powder composition comprising an admixture of powders, wherein the admixture of powders comprises:
a) a first powder which is a water redispersible polymer powder (RDP), said water redispersible polymer powder (RDP) comprising a co-dried admixture of a water insoluble film-forming polymer and a colloidal stabilizer, said film forming polymer comprising a carboxylated styrene-butadiene copolymer or the copolymerization product of styrene, butadiene, a carboxylic acid and one or more other monomer and b) a second powder comprising a polyglycol which is a polyethylene glycol, a polypropylene glycol, or any other polyether diol or triol, the amount of the polyglycol being from 0.001% by weight to 10% by weight, based upon the weight of the water redispersible polymer powder (RDP).