Process for preparing a foamed perfluorocarbon dielectric coaxia

Details Process for preparing a foamed perfluorocarbon dielectric coaxia Process for preparing a foamed perfluorocarbon dielectric coaxia

1980-02-29

1981-12-08

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

29458, 29828, 264 53, 264174, 264DIG5, 264DIG13, 521 98, B29D 2700

Patent

active

043047130

ABSTRACT:
An improved foamable dielectric composition comprising a melt extrudable perfluorocarbon resin containing therein (i) a polytetrafluoroethylene (PTFE) nucleating agent and (ii) a volatile blowing agent, preferably a lower fluorocarbon blowing agent having only one or two carbon atoms; a process for forming such a composition; and, products produced therewith. More specifically, a foamed melt extrudable fluorinated ethylene-propylene (FEP) polymer containing therein a PTFE nucleating agent and blown to a foamed structure by means of a volatile fluid--e.g., a lower fluorocarbon such as fluoromethane or, preferably, fluoroethane, a process for forming such a foamed compostion; and, products produced therewith such as jacketed electrical conductors and/or coaxial cables wherein at least one conductor is bonded to such a foamed melt extrudable resin. The foamed dielectric melt extrudable resin is characterized by its thermal stability, fire resistance, small closed cell structure, low density, and low insulating loss characteristics. In a preferred embodiment, the melt extrudable foamed resin comprises a perfluorocarbon polymer having a closed cellular structure with cells ranging from 10 to 40 mils., a density at least as low as 1.0 g./cc., and an insulation loss of less than 1.8 db/100 ft. at 1000 MHz.

REFERENCES:
patent: 3072583 (1963-01-01), Randa
patent: 3575897 (1971-04-01), Port et al.
patent: 3843757 (1974-10-01), Ehrenfreund et al.
patent: 3962153 (1976-06-01), Gore
patent: 4048208 (1977-09-01), Spicuzza et al.
patent: 4075265 (1978-02-01), McClung et al.
patent: 4107354 (1978-08-01), Wilkenloh et al.
Slothour, "Expanded PTFE Dielectrics for Coaxial Cables", Plastics Engineering, Mar. 1975, pp. 49-51.
Sales lit. of Storm Products Co., entitled "Microporous Teflon Coax".
TR. No. 94 of E. I. duPont de Nemours & Co. (Inc.) Feb. 21, 1962 "Teflon 100 FEP-Fluorocarbon Resins, Method of Producing Foamed Constructions".
TR. No. 102 of E. I. duPont de Nemours and Co. (Inc.) "Method of Extruding Foamed Shapes of `Teflon` 100, FEP-Fluorocarbon Resin" (undated).

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