Conductive polymeric composite material with a resistance which is self-regulated by the temperature

The present invention relates to a composite material comprising, by weight, the total being 100% : A) 40 to 90% of PVDF homopolymer or copolymer crystallized essentially in the form, B) 10 to 60% of a conductive filler, C) 0 to 40% of a crystalline or semi-crystalline polymer, D) 0 to 40% of a fill...

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Bibliographic Details
Main Authors Rastelletti, Emmanuel, Korzhenko, Alexander, Sharpe-Hill, R.G
Format Patent
LanguageEnglish
Published 18.07.2002
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Summary:The present invention relates to a composite material comprising, by weight, the total being 100% : A) 40 to 90% of PVDF homopolymer or copolymer crystallized essentially in the form, B) 10 to 60% of a conductive filler, C) 0 to 40% of a crystalline or semi-crystalline polymer, D) 0 to 40% of a filler other than C, such that the crystals in the form are nucleated on the surface of the particles of the conductive filler. This material is conductive with a resistance which is self-regulated by the temperature. It shows an increase in the resistance as a function of the temperature (PTC or "Positive Temperature Coefficient" effect), so that the intensity stabilizes at an equilibrium temperature.