Process for preparing diorganopolysiloxanes containing triorgano

Details Process for preparing diorganopolysiloxanes containing triorgano Process for preparing diorganopolysiloxanes containing triorgano

1988-04-01

1989-05-30

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 23, 528 33, 556467, C08G 7706

Patent

active

048352373

ABSTRACT:
Diorganopolysiloxanes containing triorganosiloxy groups as terminal units are prepared by mixing the diorganopolysiloxanes which may already contain triorganosiloxy terminal groups, after they have reached the desired average viscosity by condensation and/or equilibration in the presence of catalysts other than chlorophosphazenes, with a hexaorganodisilazane in an amount of from 0.05 to 2 percent by weight, based on the weight of the diorganopolysiloxanes employed and after mixing, a catalytic amount of a chlorophosphazene is added.

REFERENCES:
patent: 3839388 (1974-10-01), Nitzsche et al.
patent: 4725643 (1988-02-01), Burkhardt

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