Electrical devices comprising conductive polymer compositions

Details Electrical devices comprising conductive polymer compositions Electrical devices comprising conductive polymer compositions

1979-09-14

1981-12-08

Mayewsky, Volodymyr Y.

Electric heating

Heating devices

With heating unit structure

219505, 219538, 219552, 252511, 338 22R, H05B 312

Patent

active

043049877

ABSTRACT:
Electrical devices which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element composed of a conductive polymer composition which comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m.sup.2 /g such that S/D is at least 10. D is preferably less than 27 millimicrons, especially less than 18 millimicrons. S/D is preferably at least 12, especially at least 18. Particularly useful devices are in the form of heaters.

REFERENCES:
patent: 2559077 (1951-07-01), Johnson et al.
patent: 4017715 (1977-04-01), Whitney et al.
patent: 4085286 (1978-04-01), Horsma et al.
patent: 4177376 (1979-12-01), Horsma et al.
patent: 4188276 (1980-02-01), Lyons et al.
Research Disclosure, "13634, Use of the Electro-Conductive Carbon Ketjenblack EC (c08k3104)", Aug. 1975.
Klason and Kubat, "Journal of Applied Polymer Science", vol. 19, pp. 831-845, 1975.
Schubert et al., "Analysis of Carbon Black", Encyclopedia of Industrial Chemical Analysis, (1969), vol. 8, pp. 179-243.
Cities Services Co. Trade Publication, "Industrial Carbon Blacks."
Garret, Kunstoffe 67, (1977), pp. 38-40.
Toy et al., U.S. application Ser. No. 751,095, filed Dec. 16, 1976.
Verhelst et al., Rubber Chemistry and Technology 50, pp. 735-745, (1977).

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