Patent ID: 7504467
Filing Date: 2009-03-17
Classification: C08G

Abstract:
1. A process for preparing organopolysiloxanes which bear triorganosiloxy groups, of the formula where R is a monovalent, SiC-bonded, optionally substituted hydrocarbon radical which is free of aliphatic carbon-carbon double bonds and has from 1 to 18 carbon atoms, R R R a is an integer from 80 to 1000, b is an integer from 0 to 100, c is an integer from 1 to 100, d is an integer from 0 to 100, by where e is the sum of b+c and is an integer from 1 to 200, R and R, a, b, c and d are each as defined above, in the presence of at least one catalyst (B) selected from the group consisting of the metals of transition group VIII of the Periodic Table and compounds thereof, and in the presence of at least one cocatalyst K selected from the group consisting of organic acids and low molecular weight organosilicon hydrides, with water (C), to provide intermediate(s) which have Si—OH groups and are of the formula where R and R, a, b, c and d are each as defined above, and, reacting the intermediates which have SiOH groups with at least one silane (D) which has a group reactive with SiOH groups.