Foamed polymers having low loss at microwave frequencies

Details Foamed polymers having low loss at microwave frequencies Foamed polymers having low loss at microwave frequencies

B - Operations, Transporting

29

C

18/642, 337/82

B29C 47/02 (2006.01) C08J 9/14 (2006.01) H01B 3/44 (2006.01) H01B 11/18 (2006.01) H01B 13/24 (2006.01)

Patent

CA 1223722

ABSTRACT Foamed polymers having low loss at microwave fre- quencies are prepared through use of perfluorinated alkane foaming agents containing at least 3 carbon atoms. The invention is particularly valuable for polymers which are melt-processed at high temperatures, especially fluoropolymers such as tetrafluoroethylene copolymers. The polymeric foams are particularly useful as electrical insulation, especially for coaxial cables suitable for use at microwave frequencies.

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