AQUEOUS ACRYLIC COPOLYMER EMULSION, REDISPERSIBLE ACRYLIC COPOLYMER EMULSION POWDER AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an aqueous acrylic copolymer emulsion of protective colloid-type having excellent polymerization stability and produced by scarcely using a modified polyvinyl alcohol and a chain transfer agent. SOLUTION: The aqueous acrylic copolymer emulsion is produced by carrying out high-temperature redox emulsion polymerization of a polyvinyl alcohol having a saponification degree of≥95 mol% and an average polymerization degree of 100-1,000 and a hydrophobic ethylenic unsaturated monomer having a water-solubility of≤1.0 wt.% in an aqueous medium in the presence of a reducing agent at 75-90°C, adding a monomer component at least containing an acrylic monomer and carrying out emulsion polymerization of the components. The emulsion composition has excellent polymerization stability. COPYRIGHT: (C)2006,JPO&NCIPI