Patent ID: 6417297
Filing Date: 2002-07-09
Classification: C08C,C08F,C09D,C09J

Abstract:
A process for reducing the odor emission of an aqueous vinylaromatic/1,3-diene copolymer dispersion and of a water-redispersible polymer powder obtained therefrom, comprisingemulsion polymerizing of a mixture containing at least one vinylaromatic and at least one 1,3-diene in the presence of at least one surfactant substance; adding to the dispersion 0.01% to 15.0% by weight of at least one monomer selected from the group consisting of branched alkyl esters having 3 to 8 C atoms in the alkyl radical and straight-chain alkyl esters having 1 to 8 C atoms in the alkyl radical of monounsaturated monocarboxylic acids and monounsaturated dicarboxylic acids and adding to the dispersion 0.01% to 15.0% by weight of at least one monomer selected from the group consisting of vinyl esters of branched aliphatic carboxylic acids having 1 to 10 C atoms and vinyl esters of straight-chain aliphatic carboxylic acids having 1 to 10 C atoms; wherein said additions occurs in a manner selected from the group consisting of in one step and in two successive steps toward an end of the polymerizing, when a total content of free monomers in the aqueous polymer dispersion is in a range from >0 to &lE;20% by weight; and wherein the data in % by weight is based in each case on the total polymer content of the dispersion.