Electrical devices comprising conductive polymers

  • US 4,882,466 A
  • Filed: 05/03/1988
  • Issued: 11/21/1989
  • Est. Priority Date: 05/03/1988
  • Status: Expired due to Term
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First Claim
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1. An electrical device which comprises(1) a laminar resistive element which is composed of a conductive polymer composition which (a) exhibits PTC behavior, (b) comprises an organic polymer and, dispersed in the polymer, a particulate conductive filer, and (c) has a melting temperature, Tm ;

  • and(2) two electrodes which can be connected to a source of electrical power and which comprise a material which (a) has a resistivity of 1.0×

    10-6 to 1.0×

    10-2 ohm-cm, and (b) exhibits ZTC behavior at temperature less than Tm, said electrodes(i) each having a length 1, of 0.1 to 1,000,000 inches and a width, w, of 0.005 to 10 inches such that the length to width ratio is at least 1000;

    1,(ii) each having a thickness of 0.0001 to 0.01 inch,(iii) each having a resistance, Re, of 0.1 to 10,000 ohms,(iv) each attached to a flat laminar surface of the resistive element, and said resistive element having a resistance, Rcp, which is less than Re and is from 0.1 to 10,000 ohms when connected to a source of electrical power and the electrical device having a resistance, Rh, the resistances Re, Rcp and Rh being measured when the electrodes are first connected to a source of electrical power with the whole device being at a uniform temperature of 23°

    C.

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