Method for producing silicone polyethers

Details Method for producing silicone polyethers Method for producing silicone polyethers

2009-03-03

2011-12-27

Gulakowski, Randy (Department: 1766)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C528S031000

Reexamination Certificate

active

08084552

ABSTRACT:
Silicone polyethers are prepared in a two stage process by reacting an unsaturated polyether with a first Si—H functional organopolysiloxane and then with a second organopolysiloxane, in which the weight ratio of silicon bonded hydrogen in the first and second organopolysiloxanes is at least 0.9. The reaction is more rapid than a single step process and produces a product with less unreacted Si—H content.

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