Improved polymeric ptc compositions

Details Improved polymeric ptc compositions Improved polymeric ptc compositions

H - Electricity

01

C

H01C 7/02 (2006.01) H01C 7/13 (2006.01) H01C 17/30 (2006.01)

Patent

CA 2233314

Circuit protection devices comprising PTC elements and circuits containing such devices. The PTC element includes a crystalline conductive polymer composition comprising a conductive particulate filler grafted to a modified polyolefin. The modified polyolefin comprises a polyolefin having a carboxylic acid or a carboxylic acid derivative grafted thereto. The conductive particulate filler is grafted via an esterification reaction to the modified polyolefin.

Dispositifs de protection de circuits comprenant des éléments à coefficient de température positif (PTC) et circuits contenant ces dispositifs. L'élément à PTC comprend une composition polymère cristalline conductrice contenant une charge conductrice en particules greffée à une polyoléfine modifiée. Cette polyoléfine modifiée est composée d'une polyoléfine à laquelle est greffé un acide carboxylique ou un dérivé d'acide carboxylique. La charge conductrice en particules est greffée à la polyoléfine modifiée par l'intermédiaire d'une réaction d'estérification.

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