Process for preparation of cyclopolydiorganosiloxanes

Details Process for preparation of cyclopolydiorganosiloxanes Process for preparation of cyclopolydiorganosiloxanes

C - Chemistry, Metallurgy

07

F

260/445.2

C07F 7/18 (2006.01) C07F 7/21 (2006.01) C08G 77/04 (2006.01)

Patent

CA 1300165

A PROCESS FOR PREPARATION OF CYCLOPOLYDIORGANOSILOXANES ABSTRACT What is disclosed is a process for converting polydiorganosiloxanes to cyclopolydiorganosiloxanes with reduced cleavage of organic groups from silicon atoms. The process comprises (A) feeding a mixture of the polydiorgano- siloxanes, a catalyst, and an organic solvent to a device in which water is formed as the polydiorganosiloxanes react in the presence of the catalyst and the organic solvent, the water formed being driven out of said device as a two-phase organic solvent/water azeotrope; (B) reacting the polydiorganosiloxane/catalyst/ organic solvent mixture from (A), essentially free of water, to convert the polydiorgano- siloxanes to the desired product cyclopolydiorganosiloxanes; and (C) recovery of the desired product cyclopolydiorgano- siloxanes.

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