Method for making cyclic poly(siloxane)s

Details Method for making cyclic poly(siloxane)s Method for making cyclic poly(siloxane)s

1988-09-26

1990-01-23

Shaver, Paul F.

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

Organic compounds

Silicon containing

556460, C07F 708

Patent

active

048959677

ABSTRACT:
A method is provided for making cyclic poly(siloxane) by incrementally contacting linear polysilxoane with a fixed bed cracking catalyst, such as an acidic Zeolite under reduced pressure. The resulting volatile cyclic poly(siloxane) is then recovered.

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patent: 4111973 (1978-09-01), Bluestein
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patent: 4764631 (1988-08-01), Halm et al.
Cyclic Dimethyl Siloxanes, "Organo-Silicon Polymers. The Cyclic Dimethyl Siloxanes", Hunter et al., (1946) pp. 667-672, (vol. 68).
Journal of Organometallic Chemistry, 238 (1982), "Metal Complex-Catalzed Redistribution Reactions of Organosilanes", Gustavson et al., pp. 87-97.
"Cyclic Polysiloxanes from the Hydrolysis of Dichlorosilane", Seyferth et al., (1982) American Chemical Society.

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