Patent ID: 8691744

Claim:
Siloxane copolymers preparable by (a) a first step of reacting organopolysiloxanes (1) which have at least one silicon-attached hydrogen atom per molecule with substantially linear oligomeric or polymeric compounds (2) of the general formula R 1 -(A-C n H 2n ) m -A 1 -H (I) where R 1 is a univalent optionally substituted hydrocarbyl radical capable of adding Si—H groups in a hydrosilylation reaction, A is a bivalent polar organic radical selected from the group consisting of —O—, —C(O)—O—, —O—C(O)—, —O—C(O)—O—, —C(O)—NH—, —NH—C(O)—, urethane radical and urea radical, A 1 is a bivalent polar organic radical selected from the group consisting of —O—, —NH— and —NR′— wherein R′ is a univalent hydrocarbyl radical of 1 to 18 carbon atoms, n is an integer from 1 to 20, and m is zero or a positive integer, (b) a second step of reacting the resulting H-A 1 -containing intermediates (4) with organic compounds (5), which have two or more isocyanate groups per molecule, the reaction taking place in the presence of further organic compounds (6) and (7), which are reactive toward isocyanate groups, wherein the compounds (7) have the structures HB or HBH, where B is an organic radical having one or two hydrogen atoms reactive toward isocyanate groups, with the proviso that the compounds (6) contain at least one tertiary amine group, and that the compounds (7) are those which can be redetached again from the siloxane copolymer in a temperature range from 50° C. to 250° C., preferably 100° C. to 200° C., resulting once more in free isocyanate groups in the siloxane copolymer, and (c) a third step of the amino-containing intermediates (8) from step (b) being partially or completely quaternized with an alkylating agent (9), with the proviso that the water content of the compounds (1) and (2), which are used for preparing the siloxane copolymers, is lower than 2000 weight ppm, based on the total weight of compounds (1) and (2).