Base catalyzed preparation of polyorganosiloxanes with controlle

Details Base catalyzed preparation of polyorganosiloxanes with controlle Base catalyzed preparation of polyorganosiloxanes with controlle

1992-06-22

1992-12-22

Bleutge, John C.

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 23, 528 33, 556450, 556462, C08G 7706

Patent

active

051735580

ABSTRACT:
The described process uses a Lewis base as a catalyst to effect the condensation of hydroxy end-substituted polyorganosiloxanes, in the presence of triorganosilyl endblocker to control polymer chain length. The inventors have discovered that within a base catalyst concentration range where the cation concentration is about 1.times.10.sup.-3 to 2.times.10.sup.-1 mole percent in relation to the silicon atoms present, the partial pressure of water can be controlled at a constant value to produce polyorganosiloxane polymers with a reproducible and predictable level of hydroxy substitution.

REFERENCES:
patent: 4128568 (1978-12-01), Buchner
patent: 4250290 (1981-02-01), Petersen
patent: 4439592 (1984-03-01), Maass et al.
patent: 4551515 (1985-11-01), Herberg et al.
patent: 4739026 (1988-04-01), Riederer et al.
patent: 4780519 (1988-10-01), Saam et al.
patent: 4792596 (1988-12-01), Ottlinger et al.
Voronkov et al., The Siloxane Bond, Consultants Bureau, NY, 1978, pp. 159-198.

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