Conductive polymer composition and device

Details Conductive polymer composition and device Conductive polymer composition and device

H - Electricity

01

C

H01C 7/02 (2006.01)

Patent

CA 2215903

A conductive polymer composition which has a resistivity at 20 ~C of at most 1.0 ohm-cm and a PTC anomaly of at least 104 contains at most 64 % by volume of a crystalline polymeric component and at least 36 % by volume of a particulate conductive filler. A preferred conductive filler is carbon black having a DBP number of 60 to 120 cm3/100 g. Compositions of the invention, as well as other conductive polymer compositions, are preferably prepared by a method in which the polymeric component and the filler are blended in a first step at a temperature greater than the melting temperature of the polymer, the mixture is then cooled, and the mixture is then mixed in a second step. The resulting composition has a PTC anomaly that is at least 1.2 times the PTC anomaly of the first mixture.

La composition polymère conductrice selon la présente invention a une résistance spécifique maximale à 20 ·C, de 1,0 ohm-cm et une anomalie C.T.P. d'au moins 10?4¿, contient au maximum 64 % en volume d'un composant polymère cristallin et au moins 36 % en volume d'une charge particulaire conductrice. La charge conductrice préférée est le noir de carbone avec un indice d'absorption de dibutylphtalate (DBP) compris entre 60 et 120 cm?3¿/100 g. Les compositions selon l'invention ainsi que les autres compositions polymères conductrices sont préparées de préférence selon une méthode consistant à mélanger une première fois le composant polymère et la charge à une température supérieure à la température de fusion du polymère, à refroidir le mélange, puis à le mélanger une seconde fois. La composition ainsi obtenue a une anomalie C.T.P. au moins 1,2 fois supérieure à l'anomalie C.T.P. du premier mélange.

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