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PTC Devices and their preparation

  • US 4,400,614 A
  • Filed: 11/18/1981
  • Issued: 08/23/1983
  • Est. Priority Date: 05/19/1980
  • Status: Expired due to Term
First Claim
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1. A flexible electrical device which comprises(a) an elongate flexible PTC element composed of a PTC conductive polymer composition which exhibits PTC behavior and which comprises(i) a polymer component which comprises a mixture of a first crystalline polymer having a first melting point T1 and a second melting point T2 which is at least (T1 +25)°

  • C.; and

    (ii) a particulate filler component which has been dispersed in said polymer component and which comprises a conductive filler;

    (b) two elongate metal electrodes which are electrically connected to the PTC element so that, when the electrodes are connected to a source of electrical power, current flows through said PTC element; and

    (c) surrounding said PTC element and melt-fused thereto, a layer of a second polymeric composition having substantially greater flexibility at 23°

    C. than said PTC composition.

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