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Process for preparing a foamed perfluorocarbon dielectric coaxial cable

  • US 4,304,713 A
  • Filed: 02/29/1980
  • Issued: 12/08/1981
  • Est. Priority Date: 02/29/1980
  • Status: Expired due to Term
First Claim
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1. A process for preparing the core for a foam dielectric coaxial cable, said process comprising the steps of:

  • (a) forming a mixture of a melt extrudable fluorinated ethylene-propylene polymer and a polytetrafluoroethylene nucleating agent;

    (b) heating the polymer and nucleating agent mixture to the molten state;

    (c) extruding the molten mixture through an extrusion die while feeding a continuous conductor axially through the extrusion die so as to form a layer of foam dielectric surrounding and in intimate contact with the continuous conductor along the entire length and about the entire periphery thereof;

    (d) dissolving or injecting a volatile liquid blowing agent in the melt extrudable polymer at a point in the process prior to exit of the moisture from the extrusion die; and

    ,(e) recovering the foamed articles exiting from the extrusion die.

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