Conductive polymer composition

Details Conductive polymer composition Conductive polymer composition

1989-10-03

1990-12-25

Envall, Jr., Roy N.

Electric heating

Heating devices

With heating unit structure

219505, 219553, 338 22R, H05B 312

Patent

active

049805410

ABSTRACT:
Electrical devices with improved resistance stability comprise a PTC element comprising a conductive polymer and two electrodes. The conductive polymer composition comprises an organic crystalline polymer and carbon black with a pH of less than 5.0. Particularly preferred conductive polymer compositions comprise carbon blacks which have a pH of less than 5.0, a dry resistivity R.sub.CB and a particle size D in nanometers such that R.sub.CB /D is at most 0.1. Electrical devices of the invention include heaters and circuit protection devices.

REFERENCES:
patent: 4237441 (1980-12-01), Van Konynenburg et al.
patent: 4277673 (1971-07-01), Kelly
patent: 4304987 (1981-12-01), Van Konyenenburg
patent: 4374113 (1983-02-01), Yates et al.
patent: 4388607 (1983-06-01), Toy et al.
patent: 4591700 (1986-05-01), Sopory
patent: 4668857 (1987-05-01), Smuckler
patent: 4818439 (1989-04-01), Blackledge et al.

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