Patent ID: 7795367

Claim:
A process for preparing siloxane copolymers, comprising: in a first step, reacting an organyloxysilane of the formula R 7 O—SiR 1 2 —R 6 —NHR 2 (I) with an isocyanate of the formula R 3 (NCO) x (II) to form a urea compound of the formula R 3 (NH—(C═O)—NR 2 —R 6 —SiR 1 2 —OR 7 ) x (III) where the radicals R 1 are individually a monovalent, substituted or unsubstituted hydrocarbon radical optionally interrupted by heteroatom(s), R 2 individually is hydrogen or a monovalent, substituted or unsubstituted hydrocarbon radical optionally interrupted by heteroatoms, R 3 individually is a polyvalent, substituted or unsubstituted hydrocarbon radical optionally interrupted by heteroatoms, R 6 individually is a divalent hydrocarbon radical optionally interrupted by heteroatoms, R 7 individually is a monovalent, substituted or unsubstituted hydrocarbon radical optionally interrupted by heteroatoms, and x is an integer greater than 1; optionally, in a second step, hydrolyzing the urea compound of the formula (III) with water; and in a third step, reacting the urea compound of the formula (III) and/or its reaction product obtained from the second step, with a silanol-terminated compound of the formula R 5 (SiR 4 2 —OH)hd y (IV) to form a copolymer, where the radicals R 4 individually have one of the meanings given for R 1 , R 5 individually are polyvalent polyether radicals, polyester radicals, or polysiloxane radicals, and y is an integer greater than 1.