Novel PTC devices and their preparation

Details Novel PTC devices and their preparation Novel PTC devices and their preparation

1980-05-19

1982-06-15

Gilden, Leon

Metal working

Method of mechanical manufacture

Electrical device making

29621, 338 20, 264105, H05B 300

Patent

active

043343511

ABSTRACT:
The flex life of devices comprising a relatively inflexible PTC conductive polymer element is improved by surrounding the PTC element with a layer of a relatively flexible polymeric composition which is melt-fused thereto. Particularly useful devices are self-limiting strip heaters in which the polymeric component of the PTC element comprises a mixture of two crystalline polymers having substantially different melting points, the higher melting polymer having a melting point of at least 160.degree. C., preferably at least 200.degree. C., for example a mixture of polyvinylidene fluoride and a copolymer of ethylene and tetrafluoroethylene. Such devices can be made by melt-extruding a layer of the relatively flexible polymeric composition around the PTC element, and heating to cause melt-fusion of the polymers at the interface of the layer and the PTC element.

REFERENCES:
patent: 3435401 (1969-03-01), Epstein
patent: 3793716 (1974-02-01), Smith-Johannsen
patent: 3914363 (1975-10-01), Bedard et al.

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