Method for the redistribution of polyorganosiloxanes

Details Method for the redistribution of polyorganosiloxanes Method for the redistribution of polyorganosiloxanes

2006-03-15

2009-11-03

Gulakowski, Randy (Department: 1796)

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

Organic compounds

Silicon containing

C556S450000, C528S012000

Reexamination Certificate

active

07612222

ABSTRACT:
Linear hydroxy endblocked linear polyorganosiloxanes, linear chloro-endblocked polyorganosiloxanes, and mixtures thereof, are redistributed in a process by contacting the linear polyorganosiloxanes, with a diorganodichlorosilane having the formula R′2SiCl2, wherein R′ is an alkyl group containing 1-8 carbon atoms; in the presence of an aqueous hydrochloric acid catalyst; to form a redistributed mixture containing cyclic polyorganosiloxanes and chloro-endblocked polyorganosiloxanes. The process generates less amounts of undesired branched siloxane species than processes which utilize an alumina catalyst.

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