Process for preparing a liquid silicone composition

Details Process for preparing a liquid silicone composition Process for preparing a liquid silicone composition

1995-02-28

1996-04-02

Szekely, Peter A.

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...

523209, 523212, 524188, 524262, 524492, 524493, 524588, 524862, C08K 336, C08K 554, C08K 906, C08L 8307

Patent

active

055041477

ABSTRACT:
A process for preparing a liquid silicone composition of the type which comprises (A) a diorganopolysiloxane having a viscosity of 1000 to 100,000 centipoises and having at least two reactive groups, (B) a filler mainly composed of SiO.sub.2 having a specific surface area of not smaller than 50 m.sup.2 /g, (C) a diorganopolysiloxane having a viscosity of from 10 to 1000 centipoises and substantially free of any terminal silanol group, (D) hexamethyldisilazane and/or (E) water is described. In the process, 10 to 100 wt % of the (A) and (C) components and 100% of the (B), (D) and, if present, (E) components are mixed under heating conditions of 100.degree. to 250.degree. C. for a time sufficient to obtain a uniform dispersion. If present, the balances of the (A) and (C) components are subsequently mixed with the dispersion.

REFERENCES:
patent: 4152315 (1979-05-01), Lee et al.
patent: 4427801 (1984-01-01), Sweet
patent: 4785047 (1988-11-01), Jensen
patent: 4857564 (1989-08-01), Maxson
patent: 5039736 (1991-08-01), Fujiki

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