C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 77/02 (2006.01) C08K 3/04 (2006.01) C08K 3/08 (2006.01) H01C 7/02 (2006.01)
Patent
CA 2216175
The present invention provides a high temperature PTC device comprising a conductive polymeric composition that exhibits a switching temperature that falls between 150°C and 190°C, a PTC effect of at least 10 3 and a low initial resistivity at 25°C of 10 .OMEGA.cm or less. The conductive polymeric composition comprises a semicrystalline polymer component selected from nylon-12 or nylon-11, and a particulate conductive filler. The composition may include, in addition to the nylon-12 or nylon-11, a second semicrystalline component that preferably is a polyolefin-based or polyester-based thermoplastic elastomer. Crosslinking of the composition enhances thermal and electrical stability.
L'invention porte sur un dispositif PTC haute température renfermant une composition conductrice polymérique, qui présente une température de transition comprise entre 150 et 190 degrés C, un effet PTC d'au moins 10 3 et une faible résistivité initiale à 25 degrés C de 10 OMÉGAcm ou moins. La composition conductrice polymérique renferme un constituant polymérique semicristallisé, soit le nylon-12 ou le nylon-11, et une charge conductrice particulaire. La composition peut contenir, en plus du nylon-12 ou du nylon-11, un second constituant semicristallisé, qui est de préférence un élastomère thermoplastique à base de polyoléfine ou de polyester. La réticulation de la composition améliore la stabilité thermique et électrique.
Zhao Liren
Gowling Lafleur Henderson Llp
Therm-O-Disc Incorporated
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