Method for manufacturing an alkenyl group-containing organopolys

Details Method for manufacturing an alkenyl group-containing organopolys Method for manufacturing an alkenyl group-containing organopolys

1989-09-26

1990-12-25

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 33, 528 34, 528 18, C08G 7706

Patent

active

049804391

ABSTRACT:
The method of the present invention provides for the manufacturing of an alkenyl group-containing organopolysiloxane using an alkali catalyst in the presence of oxygen and in the absence of carbon dioxide. The copolymer is characterized by a viscosity of at least 500 cst at 25.degree. C., can be efficiently manufactured and is free of gelation. In the method an organopolysiloxane represented by the average formula R.sup.1.sub.a SiO.sub.(4-a)/2 in which R.sup.1 is a monovalent hydrocarbon group free of aliphatic unsaturation and a 4-8 carbon atom alkenyl group-containing organopolysiloxane represented by the average formula R.sup.2.sub.b R.sup.3.sub.c SiO.sub.(4-b-c)/2 are copolymerized.

REFERENCES:
patent: 4609574 (1986-09-01), Keryk et al.
Chemistry and Technology of Silicones, 2nd Ed., Water Noll, 1968, pp. 388-391.

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