Method for the preparation of an organopolysiloxane

Details Method for the preparation of an organopolysiloxane Method for the preparation of an organopolysiloxane

1986-08-14

1988-02-02

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 33, 528 38, 528 37, 528 12, 556459, 556462, 556466, C08G 7706

Patent

active

047229870

ABSTRACT:
An oligomer or a mixture of organopolysiloxane oligomers is polymerized in the presence of a strong acid, e.g. trifluoromethane sulfonic acid, as the catalyst to give an organopolysiloxane containing a considerable amount of silanolic hydroxy groups at the molecular chain ends. Thereafter, the mixture is admixed with water and a hexaorganodisilazane or triorganosilyl amine compound in combination so as to neutralize the acid catalyst by the ammonia produced by the hydrolysis of the disilazane or silyl amine compound with simultaneous silylation of the terminal hydroxy groups. Thus, the organopolysiloxane contains a greatly decreased amount of the residual silanolic hydroxy groups at the molecular chain ends to be imparted with remarkably improved heat stability.

REFERENCES:
patent: 4008346 (1977-02-01), Moeller
patent: 4341888 (1982-07-01), Razzano

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