Method for preparing perfluoroalkyl group-containing organopolys

Details Method for preparing perfluoroalkyl group-containing organopolys Method for preparing perfluoroalkyl group-containing organopolys

1989-10-02

1991-07-02

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 23, 528 37, 528 42, 556450, 556454, 556485, C08G 7706

Patent

active

050286790

ABSTRACT:
Perfluoroalkyl group containing organopolysiloxanes having a high degree of polymerization can be prepared by reacting a liquid organopolysiloxane of formula (I): R.sup.1.sub.aR.sup.2.sub.b (OH).sub.c SiO.sub.[4.(a+b+c)]/2 with an alkali metal hydroxide to form an alkali metal silanolate; reacting the alkali metal silanolate with a perfluoroalkyl group-containing organosilane of formula (II): RfR.sup.3 SiX.sub.2 to synthesize a perfluoroalkyl group-containing organopolysiloxane intermediate of formula (III): [(R.sup.1.sub.a R.sup.2.sub.b SiO).sub.m (RfR.sup.3 SiO)].sub.n ; and polymerizing the intermediate of formula (III) or a mixture of the intermediate and an organopolysiloxane of formula (IV): R.sup.5.sub.e R.sup.6.sub.g SiO.sub.[(4.(e+g)]/2 in the presence of a strongly acidic catalyst or strongly basic catalyst.

REFERENCES:
patent: 4157337 (1979-06-01), Evans
patent: 4814418 (1989-03-01), Miyake et al.

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