Process for preparing hydrogen siloxane copolymers

Details Process for preparing hydrogen siloxane copolymers Process for preparing hydrogen siloxane copolymers

1997-08-07

1999-10-12

Moore, Margaret G.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 32, 556451, C08G 7712

Patent

active

059656832

ABSTRACT:
A sequential catalysis of the ring opening polymerization of cyclic organosiloxanes using a base catalyst that can be neutralized by a subsequent redistribution and condensation catalyst such as a Lewis acid catalyst, preferably a phosphonitrilic compound, permits the rapid synthesis of functionalized and poly-functionalized silicone copolymers such as alkenyl hydride copolymers, a new composition of matter. The instant claims are drawn to branched siloxanes having both Si--H and Si-alkenyl groups.

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