Patent ID: 6444729
Filing Date: 2002-09-03
Classification: C04B,C08J,C08L

Abstract:
A polymer powder produced by drying aqueous polymer dispersions in the presence of a driving assistant, wherein the polymer in the polymer dispersion to be dried has a glass transition temperature TG of below 65Â° C. and wherein the drying assistant comprises at least one copolymer or salt thereof which in copolymerized form comprises based in each case on the overall number of copolymerized monomers.from 20 to 95 mol %of at least one ethylenically unsaturatedcarboxylic acid having 3 to 6 C atoms(monomers A)from 5 to 80 mol %of at least one hydroxylalkyl ester of anethylenically unsaturated carboxylic acidhaving 3 to 6 C atoms (monomers B) andup to 10 mol %of further monomers C.