High voltage insulating materials

Details High voltage insulating materials High voltage insulating materials

1972-07-21

1977-01-04

Welsh, John D.

Compositions

Electrolytes for electrical devices

252 635, 174137B, 174DIG1, 174110SR, H01B 300

Patent

active

040011283

ABSTRACT:
A filler system for polymers is disclosed which provides high voltage insulation which is resistant to tracking. The filler system utilizes a combination of alumina trihydrate and a chemically treated silica filler. The silica-treated filler results from the exposure of an inorganic silicon-containing filler having a specific surface area of at least 40 square meters per gram to one or more silanes. Preferred silanes are substituted silanes having the formula R.sub.n Si X.sub.4.sub.-n where n is 1, 2 or 3, R is an organic radical bonded to the silicon atom by a Si--C bond and X is a radical bound to the silicon atom via an atom other than a carbon atom.

REFERENCES:
patent: 2768264 (1956-10-01), Jones et al.
patent: 2897173 (1959-07-01), Boggs
patent: 3042743 (1962-07-01), Jones
Sterman et al., "Silane Coupling Agents", Modern Plastics Ency. Sept. 1966, vol. 44, No. 1A pp. 416-417.
Union Carbide Silanes, Union Carbide Corp. SF-1160B N.Y. City, Aug. 1966, pp. 4 and 14.

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