Redispergierbare, vernetzbare Dispersionspulver

摘要

The invention concerns redispersable cross-linkable dispersion powders made from water-insoluble copolymers of ethylenically unsaturated monomers plus, optionally, additives such as protective colloids and anti-blocking agents. The dispersion powders are produced by a) emulsion polymerization, at a pH of 2 to 9, of a mixture containing one or more comonomers from the group comprising vinyl esters of branched or unbranched alkylcarboxylic acids with 1 to 18 C-atoms, methacrylic acid esters and acrylic acid esters of branched or unbranched alcohols with 1 to 18 C-atoms, olefins, dienes, aromatic vinyl compounds and vinyl halides plus 0.05 to 15.0 % by wt., relative to the total weight of the comonomer mixture, of one or more silicon compound of general formula CH2=CH-(CH2)m-SiR(OR')2 in which m = 0 to 8, CH2=CR''-CO2-(CH2)nSiR(OR')2 in which n = 1 to 6, (I) or (II) and b) spray-drying, at a pH of 4 to 8, the aqueous copolymer dispersion thus obtained, with an outlet temperature of 55 to 100 DEG C, adding the optional additives before or after drying.