Polyborodiphenylsiloxanes

Details Polyborodiphenylsiloxanes Polyborodiphenylsiloxanes

1978-12-13

1980-10-14

Marquis, Melvyn I.

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

Synthetic resins

From boron reactant having at least one boron to hydrogen or...

264331, 528 5, 528 25, 528 30, 556402, C08G 7908

Patent

active

042282705

ABSTRACT:
A polyborodiphenylsiloxane having main repeating units of the formula, ##STR1## wherein X is a hydrogen atom or ##STR2## and a weight-average molecular weight of about 800 to about 5,000, and a method of preparing the same, which comprises polycondensing a borodiphenylsiloxanol of the formula, ##STR3## wherein n is zero or one, at a temperature of from about 140.degree. C. to about 400.degree. C. in the absence of a solvent.

REFERENCES:
patent: 2517945 (1950-08-01), Upson
patent: 3161613 (1964-12-01), Sprung
patent: 3519670 (1970-07-01), Markovitz
patent: 3519671 (1970-07-01), Markovitz
patent: 4152509 (1979-05-01), Yajima et al.

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