Multi layer insulation system for conductors comprising a fluorinated copolymer layer which is radiation cross-linked
AssigneeHaveg Industries, Inc.
InventorNelson Hildreth
Life of this patent
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Abstract
An insulation system for electrical conductors is provided. The insulation system has a layer of polymer selected from ethylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer and ethylene-tetrafluoroethylene terpolymer surrounding the conductor. This layer of polymer is irradiation crosslinked with from 3 to 20 megarads of high energy ionizing irradiation. Bonded to the surface of the irradiation crosslinked layer of polymer is a polyimide coating. The insulation is a high temperature, flame resistant system having a combination of properties useful in the aircraft industry as airframe and hookup wire.
Claims11
An insulation system for electrical conductors comprising a first layer of radiation crosslinked polymeric insulation in which the polymer is selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene copolymer, which polymer has been crosslinked solely by subjecting said polymer to high energy ionizing radiation, said radiation dose being from 3 megarads to 20 megarads, and a coating comprising a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
An insulated electrical conductor comprising
- (a) an electrical conductor,
- (b) a first layer of crosslinked polymeric insulator surrounding the electrical conductor, said polymer being selected from ethylene-tetrafluoroethylene copolymer, ethylene-tetrafluoroethylene terpolymer, and ethylene-chlorotrifluoroethylene, copolymer, said polymer being crosslinked solely by subjecting said polymer to from 3 megarads to 20 megarads of high energy ionizing radiation, and
- (c) a heat curable polyimide adherent to the surface of the crosslinked polymeric insulation.
Dependencies are inferred from the claim text.