Patent ID: 7153990

Claim:
A process for preparing crosslinked or branched organopolysilanes which contain at least one unit of the formulae 1 and/or 2 RSi≡ (1), ═Si═(2), at least one unit of the formula 3 R 2 Si═ (3), and optionally one or more units of the formula 4 R 3 Si— (4), comprising reacting silane(s) of the formulae 1a and 2a RSiX 3 (1a), SiX 4 (2a), silane(s) of the formula 3a R 2 SiX 2 (3a), and optionally, silane(s) of the formula 4a R 3 SiX (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.