Process for preparing linear organopolysiloxanes having terminal

Details Process for preparing linear organopolysiloxanes having terminal Process for preparing linear organopolysiloxanes having terminal

1986-06-16

1988-02-16

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...

524493, 524864, 524869, 528 21, 528 22, 528 23, 528 33, 556467, C08K 302

Patent

active

047256435

ABSTRACT:
Linear triorganosiloxy-terminated organopolysiloxanes are prepared by the condensation of linear organopolysiloxanes having one Si-bonded hydroxyl group in each teminal unit in the presence of phosphonitrilic chloride, and after the organopolysiloxane has reached the desired average viscosity and while still containing the phosphonitrilic chloride, the organopolysiloxane is reacted with from 0.05 to 1 weight percent of hexaorganodisilazane, based on the weight of the starting organopolysiloxane, with the proviso that a filler having a BET surface area of at least 50 m.sup.2 /g does not exceed 1 weight percent, based on the weight of the starting organopolysiloxane.

REFERENCES:
patent: 4008198 (1977-02-01), Krohberger et al.
patent: 4203913 (1980-05-01), Burkhardt et al.

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