Self limiting microwave susceptor

H - Electricity – 05 – B

Patent

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Details

H05B 6/64 (2006.01) B65D 81/34 (2006.01) H01C 7/02 (2006.01)

Patent

CA 2140518

A self limiting dispersion of a conductive material in a binder is disclosed wherein the conductive material consists essentially of a carbon material having a structure selected to undergo percolation when dispersed in the binder at a concentration of from about 10 weight percent to about 45 weight percent. The binder comprises a thermoplastic material selected to go through a first order phase transition or a second order transition at a temperature from about 200 °F to about 480 °F and the dispersion is formulated near the conductance percolation threshold so that its electrical conductivity drops precipitously ((e.g., at least about 1.5 to about 2 orders of magnitude) above the binder transition temperature. The dispersion of the conductive material in the binder is especially suitable for use as a self-limiting microwave heater material which is either a molding composition, surface coating composition, and especially a composition that can be applied to a substrate by printing.

Dispersion à autolimitation d'un matériau conducteur dans un liant, le matériau conducteur se composant essentiellement de carbone possédant une structure sélectionnée pour subir une percolation lorsqu'il est dispersé dans le liant à une concentration comprise entre environ 10 % en poids et environ 45 % en poids. Le liant comprend une matière présentant une transition de phase de premier ordre ou de deuxième ordre à une température comprise entre environ 200 DEG F et environ 480 DEG F, et la dispersion est formulée à proximité du seuil de percolation de conductance, de sorte que sa conductivité électrique chute rapidement (par exemple au moins d'environ 1,5 à environ 2 ordres de grandeur) au-dessus de la température de transition du liant. La dispersion de matériau conducteur dans le liant convient particulièrement comme matériau chauffant capteur d'énergie micro-ondes à autolimitation, sous la forme d'une composition de moulage, d'une composition de revêtement de surface, et notamment d'une composition pouvant être appliquée sur un substrat par impression.

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