Compositions – Electrically conductive or emissive compositions – Elemental carbon containing
Patent
1998-03-24
1999-11-16
Kopec, Mark
Compositions
Electrically conductive or emissive compositions
Elemental carbon containing
338 20, 338 21, H01B 124, H01C 702
Patent
active
059851821
ABSTRACT:
A high temperature PTC device comprising a polymeric conductive composition that includes nylon-11 and a carbon-based particulate conductive filler has a switching temperature greater than 150.degree. C., preferably between about 160.degree. C. and 200.degree. C. The composition demonstrates a high PTC effect (at least 10.sup.3, and more typically 10.sup.4 to 10.sup.5 or greater) and a resistivity at 25.degree. C. of 100 .OMEGA.cm or less, preferably 10 .OMEGA.cm or less. High temperature PTC devices that comprise nylon-11 or nylon-12 compositions and that are manufactured by extrusion/lamination demonstrate good thermal and electrical stability compared with those manufactured by compression molding and do not require composition crosslinking for stability, although crosslinking may be used to further improve stability. The use of a high temperature solder for attaching electrical terminals to the device improves the PTC properties of the device.
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Kopec Mark
Therm-O-Disc Incorporated
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