PTC Devices and their preparation

Details PTC Devices and their preparation PTC Devices and their preparation

1981-11-18

1983-08-23

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

29611, 219544, 219549, 219553, 264105, 338 22R, H05B 334

Patent

active

044006144

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.
patent: 4277673 (1981-07-01), Kelly
patent: 4286376 (1981-09-01), Smith-Johannsen et al.

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