Siloxane bischloroformates

Details Siloxane bischloroformates Siloxane bischloroformates

2005-08-16

2005-08-16

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Silicon containing

C556S439000, C556S440000, C556S441000

Reexamination Certificate

active

06930194

ABSTRACT:
Siloxane bischloroformates are prepared in a continuous process by phosgenating siloxane bisphenols in a flow reactor using a substantial excess of phosgene and sodium hydroxide. While very high levels (>95%) of conversion of the siloxane bisphenol to the corresponding siloxane bischloroformate are achieved using a flow reactor according to the method of the invention, only more modest conversion (˜90%) of the siloxane bisphenol to the corresponding siloxane bischloroformate is attained when analogous batch processes are employed. The process holds promise for use in the manufacture of silicone-containing copolycarbonates which requires high purity siloxane bischloroformate intermediates.

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English language translation of Japanese Patent 9265663.
U.S. Appl. No. 09/613,040 (RD-26769), filed Jul. 10, 2000, for “Substantially Single Phase Silicone Copolycarbonates”, of Gary C. Davis et al.

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