REDISPERGIERBARE, VERNETZBARE DISPERSIONSPULVER

摘要

PCT No. PCT/EP96/03161 Sec. 371 Date Jan. 20, 1998 Sec. 102(e) Date Jan. 20, 1998 PCT Filed Jul. 18, 1996 PCT Pub. No. WO97/04013 PCT Pub. Date Feb. 6, 1997A dispersion powder of water-insoluble copolymers of ethylenically unsaturated monomers and optionally, further additives, which are redispersible in water and obtained by: a) emulsion polymerizing, at a pH of 2 to 9, a comonomer mixture of at least one comonomer selected from vinyl esters of unbranched or branched alkylcarboxylic acids having 1 to 18 carbon atoms, methacrylic acid esters of unbranched or branched alcohols having 1 to 18 carbon atoms, acrylic acid esters of unbranched or branched alcohols having 1 to 18 carbon atoms, olefins, dienes, vinylaromatics and vinyl halides, and 0.05 to 15.0% by weight, based on the total weight of the comonomer mixture, of at least one silicon compound of the formulaCH2=CH-(CH2)m-SiR(OR')2,where m=0-8CH2=CR''-CO2-(CH2)nSiR(OR')2where n=1-6 b) spray drying aqueous dispersion, at a pH of 4 to 8 at a discharge temperature of 55 to 100 DEG C., before or after addition of any additives. The dispersion powders are useful as additives for hydraulic binders and binders in coating compositions and adhesives.