Process for converting chlorine end-terminated polyorganosiloxan

Details Process for converting chlorine end-terminated polyorganosiloxan Process for converting chlorine end-terminated polyorganosiloxan

1992-12-23

1993-08-03

Shaver, Paul F.

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

Organic compounds

Silicon containing

556461, C07F 708

Patent

active

052330702

ABSTRACT:
The present invention is a process for converting chlorine end-terminated polyorganosiloxanes to polyorganocyclosiloxanes. The process comprises forming a mixture comprising chlorine end-terminated polyorganosiloxanes, aqueous hydrogen chloride, and a heterogeneous reequilibrium catalyst. The mixture is heated at a temperature within a range of about 70.degree. C. to 150.degree. C. to effect reequilibrium of the chlorine end-terminated polyorganosiloxanes to form polyorganocyclosiloxanes which are removed from the process as they are formed.

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