Electric cable insulated with a corona resistant polyethylene composition containing a silicon additive
AssigneeGeneral Electric Company
InventorsBurton Thornley MacKenzie, Jr., Charles Frank Wallace, Jr.
Life of this patent
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Abstract
A curable composition, especially adaptable for use as insulation for wire and cable, comprising an ethylene-containing polymeric member, a curing agent, and a silicone fluid having a viscosity not greater than about 100 centistokes at 25.degree.C. A filler such as carbon black or a mineral filler may be incorporated into the system.
Claims13
An electric cable which comprises a metallic conductor and a thermosetting insulation having improved resistance to corona surrounding said conductor, said thermosetting insulation consisting of:
- a. a polymeric member containing not less than 50% by weight of ethylene selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable material selected from the group consisting of propylene and vinyl acetate;
- and
- b. a silicone fluid having a viscosity not greater than 100 centistokes at 25.degree.C in an amount of about 2 to about 5 parts by weight per 100 parts by weight of polymeric material.
An electric cable comprising a metallic conductor and a thermoset insulation having improved resistance to corona surrounding said conductor, said thermoset insulation consisting of the cured product of:
- a. a polymeric member containing not less than about 50by weight of ethylene selected from the group consisting of polyethylene, blends of polyethylene and other polymers, and copolymers of ethylene and other polymerizable materials selected from the group consisting of propylene and vinyl acetate;
- b. a peroxide curing agent for effecting cross-linking of said polymeric member;
- and
- c. a silicone fluid having a viscosity not greater than about 100 centistokes at 25.degree.C present in the range of from about 2 to 5 parts by weight per 100 parts by weight of polymeric material.
An electric cable comprising a metallic conductor and a thermoset insulation having improved resistance to corona surrounding said conductor, said thermoset insulation consisting of the cured product of polyethylene, an organic peroxide curing agent, and a silicone fluid having a viscosity not greater than 100 centistokes at 25.degree.C and present in the range of about 2 to 5 parts by weight of polyethylene.
Dependencies are inferred from the claim text.