Patent ID: 7842773
Filing Date: 2010-11-30
Classification: C08G

Abstract:
1. A process for the preparation of organosilicon compounds containing urethane groups, comprising reacting in a 1st stage, aminofunctional organosilicon compounds (1) which contain at least one siloxane unit of the formula per molecule and at least two siloxane units of the formula per molecule, in which R are identical or different and are monovalent, optionally substituted hydrocarbon radicals having 1 to 18 carbon atoms, A is a radical of the formula in which R R X is a group capable of condensation, a is 0 or 1, b is 1 or 2, z is 0 or an integer from 1 to 10; with organic carbonates (2) which contain a group of the general formula and, in a 2nd stage, condensing the reaction products of (1) and (2) which are obtained in the 1st stage and have groups capable of condensation, with silanes (3) which have groups capable of condensation, wherein silanes (3) are α-silanes of the formula in which W is a monovalent radical of the formula —CH 2 —Y, Y is a monofunctional radical selected from the group consisting of the halogens, monosubstituted O and S atoms, and substituted N and P atoms, R e is 0 or 1, to give higher molecular weight organosilicon compounds containing urethane groups.