| abstract |
The present invention relates to an aqueous polymer dispersion and a method for producing the same. Polymer dispersion comprises polymer particles having an average particle size greater than 200 nm, a unimodal particle size distribution and a single glass transition temperature, and radical emulsion polymerization of a monomer mixture comprising an ethylenically unsaturated radical polymerizable monomer Is produced using polymer seeds and less than 0.8 parts by weight of emulsifier and without protective colloids. The monomer mixture comprises: a) at least 60% by weight of C1-C20-alkyl acrylate, C1-C20-alkyl methacrylate, vinyl ester of carboxylic acid containing up to 20 carbon atoms, vinyl aroma having up to 20 carbon atoms Compounds, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols containing from 1 to 10 carbon atoms, aliphatics having from 2 to 8 carbon atoms and one or two double bonds At least one monomer selected from the group consisting of hydrocarbons and mixtures of these monomers, b) at least 0.1% by weight of at least one monomer having at least one acid group, c) optionally Consisting of further monomers, wherein the acid groups of monomer b) are wholly or partly during the emulsion polymerization It is neutralized. The aqueous polymer dispersion can be used as an adhesive, especially for the production of composite films (sheets). |