Method for the preparation of organopolysiloxanes

Details Method for the preparation of organopolysiloxanes Method for the preparation of organopolysiloxanes

1992-02-18

1993-08-31

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 18, 528 21, 528 23, 556467, C08G 7706

Patent

active

052410323

ABSTRACT:
A method for the preparation of an organopolysiloxane comprising polymerizing at least one organosiloxane in the presence of a strong acid catalyst, and subsequently neutralizing said catalyst by the addition of a neutralizing agent, is disclosed wherein the neutralizing agent is ammonia gas. The invention leads to a substantial abbreviation in the neutralization time and, because it affords a nearly complete neutralization of the acid catalyst, the method provides an organopolysiloxane which has excellent heat resistance.

REFERENCES:
patent: 4482670 (1984-11-01), Saam et al.
patent: 4722987 (1988-02-01), Ikeno

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