Process for producing the viscosity, long shelf life silicone re

Details Process for producing the viscosity, long shelf life silicone re Process for producing the viscosity, long shelf life silicone re

1991-01-30

1997-07-29

Marquis, Melvyn I.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528 15, 528 12, 528 18, 528 19, 528 26, 524379, C08K 505

Patent

active

056523025

ABSTRACT:
The invention is an improvement in a process for producing silicone resins, to produce a silicone resin that has a high dynamic viscosity of at 293.degree. K. of from about 40 to about 300 mPas, a long shelf life, and a siloxane content of from about 50 to about 70 ma %, by the condensation of oligomeric siloxanes in concentrated solutions, by carrying out the condensation by heating at reflux and in the presence of a metal containing catalyst and dicarboxylic acid.

REFERENCES:
patent: 3155634 (1964-11-01), Pike
patent: 3668228 (1972-06-01), Zbinden et al.
patent: 3919344 (1975-11-01), Merrill et al.
patent: 4130599 (1978-12-01), Merrill et al.
patent: 4141926 (1979-02-01), Ariga et al.
patent: 4486476 (1984-12-01), Fritsch et al.
patent: 4781973 (1988-11-01), Zotto
East German TGL Standard 14301 Mar. 1962.
Noll: Chemie und Technologie Der Silicone Verlag Chemie, 1968 pp. 183, 357.
Deutsche Farben Zeitschrift 1956, No. 1, pp. 4-5.

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