Tracking-resistant electrical insulators containing silica and a

Details Tracking-resistant electrical insulators containing silica and a Tracking-resistant electrical insulators containing silica and a

1993-09-27

1995-06-20

Michl, Paul R.

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...

523220, 523513, 523514, 523521, 524437, 524493, C08J 320, C08K 318, C08K 322, C08L 6706

Patent

active

054261457

ABSTRACT:
Electrical insulators having a high tracking resistance are obtained from a highly filled polymerizable composition, by injection molding said composition within a short period of time as low as 5 minutes, said composition containing an amount of up to 96% by weight of an improved filler which comprises, based on the total composition, from about 40 to about 52% by weight of silica sand having a particle size such that no less than about 70% by weight of the particles are retained on a 60 mesh U.S. standard sieve and no more than about 30% by weight of the particles are retained on a 40 mesh U.S. standard sieve, an amount of from about 23 to about 36% by weight of silica sand having a particle size such that no less than about 80% by weight of the particles are retained on a 325 mesh U.S. standard sieve and no more than about 11% by weight of the particles are retained on a 200 mesh U.S. standard sieve, and a smaller proportion of finely comminuted alumina; and the remainder of the composition comprising a relatively high viscosity unsaturated polyester resin precursor incorporated in said filler. Fibrous materials may be added to the filler for increases strength and dimensional stability.

REFERENCES:
patent: 3956230 (1976-05-01), Gaylord
patent: 4001128 (1977-01-01), Penneck
patent: 4210774 (1980-07-01), Perry
patent: 4311738 (1982-01-01), Chi
patent: 4766163 (1988-08-01), Strudwick

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