Continuous process for preparing organopolysiloxanes containing

Details Continuous process for preparing organopolysiloxanes containing Continuous process for preparing organopolysiloxanes containing

1987-08-12

1988-12-20

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 16, 528 23, 528 33, 528 37, 556453, 556456, 556462, 556467, C08G 7706

Patent

active

047925965

ABSTRACT:
Organopolysiloxanes containing triorganosiloxy terminal units are obtained by a continuous process in which an organopolysiloxane mixture containing organo(poly)siloxanes having triorganosiloxy terminal units and cyclic organopolysiloxanes are introduced into a tube reactor that has been heated to at least 80.degree. C. and which contains a static catalyst bed. The organopolysiloxane composition containing triorganosiloxy terminal units, which exits from the tube reactor is different from the organo(poly)siloxanes containing triorganosiloxy terminal units which were introduced into the reactor. The contents of the reactor in the area between one-third and two-thirds of the distance between the point where the organopolysiloxanes are introduced into the tube reactor and the point where the organopolysiloxanes exit from the reactor, are maintained at a temperature which is at least 50.degree. C. below that which is immediately upstream from the outlet of the reactor.

REFERENCES:
patent: 3236806 (1966-02-01), Dunham, Jr.
patent: 3607899 (1971-09-01), Brown et al.
patent: 3816493 (1974-06-01), Nitzsche et al.
patent: 4599437 (1986-07-01), Riederer

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