Foamed perfluorocarbon resin compositions

Details Foamed perfluorocarbon resin compositions Foamed perfluorocarbon resin compositions

H - Electricity

01

B

18/642, 337/82

H01B 13/14 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01) H01B 11/18 (2006.01)

Patent

CA 1154216

ABSTRACT OF THE DISCLOSURE An improved foam dielectric coaxial cable in which the foam dielectric composition comprises a foamed melt extrudable fluori- nated 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 fluoro- methane or, preferably, fluoroethane. The foam dielectric is characterized by its thermal stability, file resistance, small closed cell structure, low density, and low insulating loss characteristics. In a preferred embodiment, the foam dielectric has 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.

370904

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