Patent ID: 7250468

Claim:
A polyvinyl alcohol-stabilized redispersible powder having plasticizing properties, prepared by drying a polyvinyl alcohol-stabilized, aqueous dispersion of at least one homopolymeric or copolymeric base polymer comprising polymerized monomers selected from the group consisting of vinyl esters of optionally branched C 1-18 alkylcarboxylic acids, (meth)acrylic esters of optionally branched C 1-15 alcohols, dienes, olefins, vinylaromatics and vinylhalides, in the presence of a plasticizing copolymer comprising a copolymerisate comprising: a) at least one monomer selected from the group consisting of ethylenically unsaturated C 4-8 monocarboxylic acids, ethylenically unsaturated C 4-8 dicarboxylic acids, ethylenically unsaturated C 4-8 dicarboxylic acid anhydrides, and salts thereof, in an amount of from about 10 to about 50 weight percent, b) at least one ethylenically unsaturated monomer containing sulfonic, sulfuric, and/or phosphonic acid groups, and/or salts thereof, in an amount of from about 10 to about 50 weight percent, and c) at least one monomer selected from the group consisting of vinyl esters of optionally branched C 1-18 alkylcarboxylic acids and (meth)acrylic esters of optionally branched C 1-15 alcohols, in an amount of from about 20 to about 80 weight percent, said weight percents based on the total weight of said plasticizing copolymer, wherein said base polymer is an ethylene/vinyl acetate copolymer, and the plasticizer is a copolymer of at least one carboxyl-group-containing monomer selected from the group consisting of acrylic acid, methacrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic acid, and salts thereof, of sulfopropylacrylate, and one or more alkyl(meth)acrylates.