Patent ID: 7153990
Filing Date: 2006-12-26
Classification: C08G

Abstract:
1. A process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the formulae 1 and/or 2 at least one unit of the formula 3 and optionally one or more units of the formula 4 comprising reacting silane(s) of the formulae 1a and 2a silane(s) of the formula 3a and optionally, silane(s) of the formula 4a where R is hydrogen or a hydrocarbyl radical having from 1 to 18 carbon atoms and X is fluorine, chlorine or bromine, with elemental alkali metal, elemental alkaline earth metal, or combinations thereof, and immediately after reaction has ended, treating the reaction mixture at at least 50° C. for at least 30 seconds with a mineral treating agent comprising one or more polysilicic acids, silicates or aluminosilicates.