Melt-shapeable fluoropolymer compositions

Electric heating – Heating devices – With heating unit structure

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338 22R, 338308, 338309, 219505, 219552, H05B 310

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active

048598364

ABSTRACT:
Melt-shapeable polymeric compositions comprising a first fluoropolymer of relatively low crystallinity, e.g. a copolymer of tetrafluoroethylene and a perfluorinated comonomer, and a second fluoropolymer of relatively high crystallinity, especially a fluoropolymer obtained by irradiating PTFE or another fluoropolymer which cannot be melt-shaped in the absence of other polymers. The weight ratio of the first to the second polymer is preferably 0.3:1 to 2.5:1. The compositions have a wide variety of uses, for example as insulating materials or, if they contain carbon black or another conductive filler, as PTC conductive polymers.

REFERENCES:
patent: 3291864 (1966-12-01), Eldridge et al.
patent: 3838030 (1974-09-01), Kagaya et al.
patent: 4123401 (1978-10-01), Berghmans et al.
patent: 4400614 (1983-08-01), Sopory
patent: 4427877 (1984-01-01), Dhingra

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