Silicone rubber compositions for high-voltage electrical insulat

Details Silicone rubber compositions for high-voltage electrical insulat Silicone rubber compositions for high-voltage electrical insulat

1998-02-27

2000-12-19

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...

524731, 524862, 524266, 526279, 528 31, 528 32, C08K 322, C08K 524, C08L 8304, C08F13008

Patent

active

061628549

ABSTRACT:
A silicone rubber composition contains (A) 100 parts by weight of an organopolysiloxane composition of the organic peroxide or addition reaction curing type, (B) 20-400 parts by weight of aluminum hydroxide, and (C) 1-20 parts by weight of an organopolysiloxane of formula (I): R.sup.1.sub.a (OX).sub.b SiO.sub.(4-a-b)/2 wherein R.sup.1 is a monovalent hydrocarbon group, at least 10 mol % of the R.sup.1 groups being phenyl, X is hydrogen or a monovalent hydrocarbon group, a and b are positive numbers satisfying the range: 1.0.ltoreq.a<2.0, 1<a+b.ltoreq.3, and 0.001.ltoreq.b/(a+b).ltoreq.0.8. The composition cures into a silicone rubber having improved high-voltage electrical insulating properties even under humid conditions.

REFERENCES:
patent: 5369161 (1994-11-01), Kunieda et al.
patent: 5519080 (1996-05-01), Matsushita et al.
patent: 5525425 (1996-06-01), Fujioka et al.
patent: 5631321 (1997-05-01), Okazaki et al.
patent: 5854344 (1998-12-01), Shiono et al.
JP 53035982--English abstract (Apr. 3, 1978).

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