A flexible fabric for use as an electrical conductive...

H - Electricity – 01 – B

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Details

H01B 1/24 (2006.01) C08K 3/04 (2006.01) H05B 3/14 (2006.01)

Patent

CA 2353456

The invention relates to conductive heaters, and has its objective to provide a material that exhibits a uniform heating effect over the full area of the heater, relatively free from hot and cold spots, a further objective being to maintain the heater pliable. These objectives are met by a conductive material comprising finely divided carbon particles uniformly dispersed in an elastomeric carrier there being carbon particle levels of 20% to 75% by dry weight to carrier levels. Preferably, the carrier is an elastomeric polymer. A further aspect of the invention is a method of forming a compound for an electrically conductive heater comprising stirring fine carbon particles into a polymer base containing an anti-adsorption compound, to achieve carbon particles to polymer levels of 20% by dry weight to 75% by dry weight, and subjecting mixture to high speed stirring for a pre-determined period of time, with the maintenance of the mixture below a predetermined level, to grind the carbon particles to a predetermined final fineness.

L'invention concerne des éléments de chauffage conducteurs. L'invention a aussiour objectif de fournir un matériau qui exerce un effet de chauffage uniforme sur la totalité de l'élément de chauffage, sans points chaud ni froid, tout en assurant la souplesse de l'élément de chauffage. Ces objectifs sont réalisés par un matériau conducteur comprenant des particules de carbone finement divisées, dispersées avec uniformité dans un support élastomère, à raison de 20 à 75 % de particules de carbone en poids secs par rapport au support. De préférence, le support est en élastomère. Selon un autre aspect, l'invention concerne un procédé permettant de former un composé pour un élément de chauffage électriquement conducteur consistant à mélanger les particules de carbone fines dans une base polymère contenant un composé anti-adsorption, pour obtenir 20 % en poids sec de particules de carbone par rapport à 75 % en poids secs de la base de polymère. Ce procédé consiste ensuite à mélanger les composés à vitesse élevée, pendant un laps de temps prédéterminé, tout en maintenant le mélange en dessous d'un niveau prédéterminé, puis à broyer les particules de carbone jusqu'à obtenir une finesse prédéterminée.

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