| 摘要 |
<p>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 DEG C, preferably between about 160 DEG C and 200 DEG C. The composition demonstrates a high PTC effect (at least 10<3>, and more typically 10<4> to 10<5> or greater) and a resistivity at 25 DEG 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. <IMAGE></p> |
