Process for the chain extension of .alpha.,.omega.-dihydroxypoly

Details Process for the chain extension of .alpha.,.omega.-dihydroxypoly Process for the chain extension of .alpha.,.omega.-dihydroxypoly

1997-11-10

1999-06-22

Glass, Margaret W.

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

Synthetic resins

From silicon reactant having at least one...

528 17, 528 18, 528 34, 528901, C08G 7708

Patent

active

059143827

ABSTRACT:
In the chain extension of a low molecular weight .alpha.,.omega.-dihydroxypoly(diorganosiloxane) wherein the siloxane is contacted with a chain extension catalyst, the improvement wherein said catalyst comprises at least one phosphoric acid ester, orthophosphoric acid, or a salt thereof. The reaction proceeds rapidly and, when complete, the catalyst can easily be deactivated to prevent degradation and/or rearrangement.

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