Temperature sensitive electrical device

Details Temperature sensitive electrical device Temperature sensitive electrical device

H - Electricity

01

C

356/108, 338/18

H01C 7/02 (2006.01)

Patent

CA 1133085

S P E C I F I C A T I O N Title: "CONDUCTIVE POLYMER COMPOSITIONS" Applicant: Raychem Corporation, a corporation organized according to the laws of the State of California, U.S.A., of 300 Constitution Drive, Menlo Park, California 94025, U.S.A. Inventor: Peter H. van Konynenburg, a citizen of the United States of America, residing at 739 Coastland Drive, Palo Alto, California Convention Priority to be claimed from: U.S. Serial No. 943,659, filed 18 September, 1978 by the inventor named above. ABSTRACT OF THE DISCLOSURE The invention relates to electrical devices, which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element which is composed of a conductive polymer composition. According to the invention, particularly good results are obtained if the CW composition comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m2/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.

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