Patent ID: 8039563

Claim:
A process comprising: a) polymerizing a composition comprising one or more monomers selected from the group consiting of of vinyl esters of carboxylic acids having from 1 to 15 carbon atoms, methacrylic esters or acrylic esters of unbranched or branched alcohols having from 1 to 15 carbon atoms, olefins, dienes, vinyl aromatics and vinyl chloride; an initiator consisting of a water soluble initiator selected from the group consisting of sodium, potassium and ammonium salts of peroxodisulfuric acid, hydrogen peroxide, tert-butyl peroxide, tert-butyl hydroperoxide, potassium peroxodiphosphate, tert-butyl peroxopivalate, cumolene hydroperoxide, and isopropylbenzene monohydroperoxide; and a polyvinyl alcohol, in the absence of emulsifiers other than the polyvinyl alcohol, by emulsion polymerization at a maximum polymerization temperature of 140° C. to form a polymer dispersion stabilized by polyvinyl alcohol, wherein at least 60% total conversion in the polymerization occurs at a temperature from 100° C. to 140° C., the polymerization temperature being raised to at least 120° C.; and b) drying of the polymer dispersion stabilized by polyvinyl alcohol to obtain a water-redispersible polymer powder composition.