Heating elements comprising conductive polymers capable of dimen

Details Heating elements comprising conductive polymers capable of dimen Heating elements comprising conductive polymers capable of dimen

1977-03-09

1979-12-04

Mayewsky, Volodymyr Y.

Electrical resistors

Flexible or folding

Tape or sheet

219528, 219543, 219549, 219552, 264105, 338 22R, 338 22SD, 338211, 252511, H01C 306

Patent

active

041774469

ABSTRACT:
The invention relates to heating elements comprising conductive polymers which are capable of undergoing a change in dimension. The heating elements comprise a laminar member composed of a conductive polymer and two laminar electrodes connected directly or indirectly to opposite faces of the laminar member, and there are apertures, for example slits, passing through the thickness of the element so that at least one planar dimension of the element can be changed by changing the shape of the apertures. The apertures through the element facilitate its dimensional change. Preferably the laminar member exhibits PTC characteristics. The heating elements are particularly useful in the form of articles in which the element is attached to a heat-responsive sheet, for example a heat-recoverable polymeric film.

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patent: 3793716 (1974-02-01), Smith-Johannsen
patent: 4017715 (1977-04-01), Whitney et al.

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