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Irradiation cross-linked polymeric insulated electric cable

  • US 4,317,001 A
  • Filed: 09/18/1980
  • Issued: 02/23/1982
  • Est. Priority Date: 02/23/1979
  • Status: Expired due to Term
First Claim
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1. An electric cable comprising a conductor and at least one layer of insulating material therearound, said layer comprising a radiation cross-linked, polymeric material with carbon black distributed therein, the amount and particle size of the carbon black which is present in the polymeric material being such that the volume resistivity of said layer of insulating material is at least 1×

  • 1010 ohm-cm. but carbon black having a particle size in the range from about 200 to about 500 millimicrons being present in the polymeric material in an amount of about 10% to about 40% of the total weight of the polymeric material and the carbon black having a particle size in said range, said insulating layer being distinguished from other insulating layers comprising said radiation cross-linked, polymeric material with carbon black therein in particle sizes and amounts different from particle sizes in said range and in said amount not only by having a resistivity of at least 1×

    1010 ohm-cm. but also by having a greater dielectric strength and a reduction in at least one of the number and of the size of electron trees therein as compared to such other insulating layers having lesser amounts of said carbon black.

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