Epihalohydrin electrical stress controlling material
AssigneeMinnesota Mining and Manufacturing Company
InventorsThomas J. D. Heyer, Robert A. Wandmacher
Life of this patent
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Abstract
A non-tacky electrical stress control material comprising a) about 100 parts of a resin component containing 1) from about 20% to about 80% of an epihalohydrin polymer, and 2) correspondingly, from about 80% to about 20% of an insulating silicone polymer having a tan .delta. of less than one, b) from about 10 to about 200 parts of a filler, said filler being nonconductive at room temperature, selected from the group consisting of barium titanate and hydrated aluminum silicate, and c) from 0 to 30 parts of a plasticizer.
Claims8
A non-tacky electrical stress control material comprising a mixture of
- a) about 100 parts by weight of a resin component consisting of a blend of
- 1) from about 20% by weight to about 80% by weight of an epihalohydrin polymer, and
- 2) correspondingly, from about 80% by weight to about 20% by weight of an insulating silicone polymer having a tan .delta. of less than one, such silicone being a gum silicone having a durometer of from about 5 to about 30
- b) from about 10 to about 200 parts by weight per hundred parts by weight resin component of barium titanate, and
- c) from 0 to 30 parts by weight of a plasticizer, said material having a permittivity greater than about 15, and a tan .delta. of less than 4 when tested under electrical stress of from at least about 3 kV to about 20 kV/cm.
Dependencies are inferred from the claim text.