Patent ID: 7396894
Filing Date: 2008-07-08
Classification: C08G

Abstract:
1. A process for preparing linear organopolysiloxanes (P) containing both diorganosiloxy units and Si—H groups, comprising, in a first step, reacting diorganodichlorosilanes (A) and monochlorosilanes (B) and optionally dichlorosilanes (C), at least one of monochlorosilanes (B) or dichlorosilanes (C) containing Si—H groups, with at most 0.5 mol of water per mole of hydrolyzable chlorine to give a partial hydrolyzate (T) and gaseous hydrogen chloride, and, in a second step, removing SiCl groups still present in the partial hydrolyzate (T) by reacting with water to form hydrochloric acid, and recovering a hydrolyzate (H) containing organopolysiloxanes (P), wherein the hydrolyzate (H) obtained after the second step is contacted with a rearrangement catalyst.