Process for the polymerization of cyclic diorganopolysiloxanes w

Details Process for the polymerization of cyclic diorganopolysiloxanes w Process for the polymerization of cyclic diorganopolysiloxanes w

1977-06-22

1978-10-24

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

2604482E, 260615B, 252431R, 528 18, 528 37, 528421, C08G 7704

Patent

active

041222474

ABSTRACT:
Diorganopolysiloxane homo- and copolymers having a viscosity from 50 to 200,000,000 centipoise at 25.degree. C, are produced by (a) reacting a composition of (i) a first cyclic siloxane having 3 to 6 units alone or admixed with (ii) a second cyclic siloxane having 3 to 6 units, (i) being present in an amount of 30 to 100 mol % of the composition, at a temperature in the range of 90.degree. to 150.degree. C and in the presence of 5 to 500 parts per million, as alkali metal hydroxide of a catalyst comprising alkali metal hydroxide or a silanolate of an alkali metal hydroxide complexed with a low molecular weight polymer of ethylene oxide (polyethylene glycol) soluble in the cyclic siloxanes. Especially useful products of the process are homopolymers and copolymers including siloxane chain units of the formula R R.sup.1 SiO wherein R.sup.1 is alkyl, halogenated alkyl or cycloalkyl, and preferably, perfluoroalkyl, and R is the same as R.sup.1 and, in addition, vinyl or phenyl.

REFERENCES:
patent: 4003917 (1977-01-01), Selin

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