Process for preparation of cyclopolydiorganosiloxanes

Details Process for preparation of cyclopolydiorganosiloxanes Process for preparation of cyclopolydiorganosiloxanes

1985-11-19

1987-08-25

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556461, C07F 708

Patent

active

046894209

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 polydiorganosiloxanes, 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 polydiorganosiloxanes to the desired product cyclopolydiorganosiloxanes; and (C) recovery of the desired product cyclopolydiorganosiloxanes.

REFERENCES:
patent: 2934550 (1960-04-01), Jack
patent: 3347895 (1967-10-01), Omietanski et al.
patent: 3358009 (1967-12-01), Omietanski et al.
patent: 4197251 (1980-04-01), Hirakawa et al.
patent: 4539418 (1985-09-01), Takago et al.

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