Chain organopolysiloxane and process for producing the same

Details Chain organopolysiloxane and process for producing the same Chain organopolysiloxane and process for producing the same

1994-02-15

1994-12-20

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 37, 528 42, C08G 7706

Patent

active

053747020

ABSTRACT:
A chain organopolysiloxane is obtained by polymerizing a fluorine-containing cyclotrisiloxane of the general formula: ##STR1## (wherein R.sup.1 is a monovalent hydrocarbon group, and Rf is a perfluoroalkyl group or perfluoroalkyl ether group)
in the presence of a lithium silanolate catalyst, silylating the resulting polymerization product, and treating the silylated product at a temperature of not lower than 100.degree. C. under a reduced pressure of not higher than 10.sup.-1 mmHg to remove volatile components therefrom. The organopolysiloxane is essentially free of volatile low-molecular siloxanes. Therefore, the chain organopolysiloxane can be used without the problems which might arise from the volatile low-molecular siloxanes, such as evaporation of low-molecular siloxanes from a cured rubber product with the result of electrical-contact troubles.

REFERENCES:
patent: 3445426 (1969-05-01), Lee
patent: 5028679 (1991-07-01), Terae et al.
patent: 5059668 (1991-10-01), Fukuda et al.
patent: 5118775 (1992-06-01), Inomata et al.

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