Method for preparing diphenylsiloxane/dimethylsiloxane copolymer

Details Method for preparing diphenylsiloxane/dimethylsiloxane copolymer Method for preparing diphenylsiloxane/dimethylsiloxane copolymer

1991-04-18

1992-12-08

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 37, 528 43, C08G 7704

Patent

active

051699206

ABSTRACT:
The molecular weight of diphenylsiloxane-dimethylsiloxane copolymers can be controlled and the desired copolymers obtained in high yield when mixtures of hexaphenylcyclotrisiloxane and hexamethylcyclotrisiloxane are polymerized in a suitable aprotic solvent using a specified class of lithium silanolates as the polymerization initiator and a low molecular weight silanol-terminated polydiorganosiloxane as a molecular weight regulator, and the polymerization reaction is terminated when from 85 to 100 percent of the cyclosiloxanes are converted to said copolymer and prior to any substantial equilibration of the copolymer.

REFERENCES:
patent: 3337497 (1967-08-01), Bostick
patent: 3578726 (1971-03-01), Bostick et al.
patent: 4317899 (1982-03-01), Bluestein et al.
patent: 4807341 (1989-04-01), Nielsen et al.
patent: 5045621 (1991-09-01), Suzuki
patent: 5079291 (1992-01-01), Evans

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