Compositions – Electrically conductive or emissive compositions
Patent
1999-06-28
2000-07-18
Gupta, Yogendra
Compositions
Electrically conductive or emissive compositions
252511, 252512, 252502, 252503, 338 22R, 338329, H01B 100
Patent
active
060903139
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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Gupta Yogendra
Hamlin D. G.
Therm-O-Disc Inc.
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