Patent ID: 8674039
Filing Date: 2014-03-18
Classification: C04B,C08G,C08L

Abstract:
1. A crosslinkable polymer powder composition comprising a polymer powder, obtained by a) free radical polymerization, in an aqueous medium, of one or more monomers selected from the group consisting of vinyl esters of straight-chain or branched alkylcarboxylic acids having 1 to 15 C atoms, methacrylates and acrylates of alcohols having 1 to 15 C atoms, vinylaromatics, olefins, and dienes, no epoxide-functional comonomers being copolymerized, and b) subsequent spray drying of the polymer dispersion obtained thereby in the presence of a protective colloid as drying aid to form the polymer powder, wherein an epoxy resin is added before and/or during the polymerization and/or before the drying of the polymer dispersion, wherein the composition is redispersible in water; wherein the protective colloid is selected from the group consisting of polyvinyl alcohols; polyvinyl acetals; polyvinylpyrrolidones; polysaccharides in water-soluble form; celluloses and carboxymethyl, methyl, hydroxyethyl and hydroxypropyl derivatives thereof; dextrins; cyclodextrins; proteins; ligninsulfonates; poly(meth)acrylic acid; copolymers of (meth)acrylates with carboxy-functional comonomer units; poly(meth)acrylamide; polyvinylsulfonic acids and water-soluble copolymers thereof; melamine formaldehyde sulfonates; naphthalene formaldehyde sulfonates; styrene-maleic acid copolymers; vinyl ether-maleic acid copolymers and cationic polymers.