Patent ID: 7321019

Claim:
A process for the preparation of an aqueous dispersion containing organopolysiloxane/polyurea copolymers of the formula R 3 -[(A) a (B) b ]-R 3 (I), in which (A) is a radical of the formula —[NH-Z-NH—CO—ND-Y—SiR 2 —(O—SiR 2 ) r —O—SiR 2 —Y—ND-CO]— (II) and (B) a radical of the formula —[NH-Z-NH—CO-E-X-E-CO]— (III) in which X are identical or different C 1-700 alkylene radicals optionally substituted by fluorine, chlorine, C 1 -C 6 -alkyl or C 1 -C 6 -alkyl ester in which non-adjacent methylene units are optionally replaced by —O—, —COO—, —OCO— or —OCOO— groups, or are optionally substituted C 6-22 arylene radicals, Y are identical or different C 1-30 hydrocarbon radicals in which non-adjacent methylene units are optionally replaced by —O— groups, Z are identical or different divalent C 1-30 hydrocarbon radicals optionally substituted by fluorine or chlorine, D are identical or different and are hydrogen, an optionally substituted hydrocarbon radical, or an —R 2 Si—X—NH 2 radical, E are identical or different and are oxygen or an amino group —NR 2 —, R are identical or different and are a monovalent C 1-20 hydrocarbon radical optionally substituted by fluorine or chlorine, or an —OR 4 radical in which R 4 has the same meaning as that given for R 2 , R 2 are identical or different and are hydrogen or a C 1-22 hydrocarbon radical, R 3 are identical or different and are an —NH-Z-NCO, an —CO-E-X-E-H or an —CO—ND-Y—SiR 2 —(O—SiR 2 ) r —O—SiR 2 —Y—NDH radical, r is 0 or an integer from 1 to 4000, a is an integer greater than 1 and b is 0 or an integer from 1 to 2000, wherein the individual blocks (A) and (B) are optionally randomly distributed (R 3 -[(A) a -stat-(B) b ]-R 3 ), comprising mixing (a) at least one amino-terminated organopolysiloxane, (b) at least one diisocyanate, (c) water, (d) at least one Brönsted acid, (e) optionally one or more surface-active agents, (f) one or more bases, (g) polyfunctional amines which differ from (a), and (h) optionally one or more polyfunctional isocyanates which differ from (b), and reacting reactive species to form an organopolysiloxane/polyurea polymer.