Anhydrous process for preparation of polyorganosiloxanes

Details Anhydrous process for preparation of polyorganosiloxanes Anhydrous process for preparation of polyorganosiloxanes

1992-12-21

1993-08-24

Shaver, Paul F.

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

Organic compounds

Silicon containing

556453, 556456, C07F 708

Patent

active

052391019

ABSTRACT:
The present invention is an anhydrous process for preparing organosiloxy end-blocked polyorganosiloxanes from chlorine end-terminated polyorganosiloxanes. The process comprises contacting an anhydrous mixture comprising a chlorine end-terminated polyorganosiloxane and an organodisiloxane with a rearrangement catalyst, where the rearrangement catalyst facilitates a chlorine and organosiloxy exchange between the chlorine end-terminated polyorganosiloxane and the organodisiloxane forming a organochlorosilane as a by-product. The organochlorosilane is continuously removed from the process providing a means by which the chlorine displaced from the chlorine end-terminated polyorganosiloxane can be effectively removed from the organosiloxy end-blocked polyorganosiloxanes in a useable form. The present process is especially useful for the rearrangement of chlorine end-terminated polyorganosiloxanes having one or more hydrogen atoms bonded to silicon to organosiloxy end-blocked polyorganohydrosiloxanes.

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