Patent ID: 9156977
Filing Date: 2015-10-13
Classification: C04B,C08F,C08L

Abstract:
1. A process for preparing protective colloid-stabilized polymers based on (meth)acrylate acid esters, said process comprising: conducting radically initiated emulsion polymerization of at least one monomer selected from the group consisting of acrylic acid esters and methacrylic acid esters, and optionally at least one further monomer copolymerizable therewith, wherein the acrylic acid esters and the methacrylic acid esters constitute 45 to 100 wt % based on a total weight of monomers used overall in the radically initiated emulsion polymerization, wherein the emulsion polymerization is carried out in the presence of at least one protective colloid including at least one fully hydrolyzed 1-alkylvinyl ester/vinyl ester copolymer having a degree of ester hydrolysis of 96 to 100 mol %, such that the protective colloid-stabilized polymers comprise the at least one monomer grafted on the at least one fully hydrolyzed 1-alkylvinyl ester/vinyl ester copolymer, wherein the at least one further monomer is a member selected from the group consisting of vinyl esters of unbranched or branched carboxylic acids having 1 to 12 C atoms, vinyl aromatics, vinyl halides, ethylene and propylene, wherein the emulsion polymerization is conducted in water and provides an aqueous dispersion of the protective colloid-stabilized polymers, and optionally drying of the aqueous dispersion to obtain a polymer powder redispersible in water.