Method for the preparation of branched organopolysiloxane

Details Method for the preparation of branched organopolysiloxane Method for the preparation of branched organopolysiloxane

1992-10-19

1993-10-19

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 14, C08G 7704

Patent

active

052546586

ABSTRACT:
The present invention is a method for the preparation of branched organopolysiloxane in which polysiloxane with the formula SiO.sub.2 constitutes the branching center or branch origin and the terminal on only one side of diorganopolysiloxane is bonded to the branch origin wherein this bonding is exactly to the branch origin. Specifically, the method for preparation of branched polyorganosiloxane comprises the reaction of an alkali metal compound with a silanol-containing polysiloxane described by formula

REFERENCES:
patent: 3481898 (1969-12-01), Davies et al.
Polymer Science U.S.S.R., vol. 10, 1968, Oxford, Great Britain, pp. 49-55, K. A. Andrianov et al. "Study of Polydimethylsiloxanes with Three- and Four- Functional Centres of Branching".
Polymer Science U.S.S.R. vol. 23, No. 6, Jun. 1982, Oxford, Great-Britain pp. 1562-1569, I. I. Tverdokhlebova et al. "Synthesis and Properties of Star-Shaped Polymethylphenyl iloxane".
H. Huang, et al., Polymer Bulletin, vol. 14, pp. 557-564 (1985).

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