초록 ▼

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

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.

대표청구항 ▼

[ I claim:] [1.] An electrically conductive polymeric composition which exhibits PTC behavior, comprising:(a) a semicrystalline polymer component that includes nylon-11;(b) a carbon-based particulate conductive filler,wherein the composition has a resistivity at 25.degree. C. of 100 .OMEGA.cm or les

[ I claim:] [1.] An electrically conductive polymeric composition which exhibits PTC behavior, comprising:(a) a semicrystalline polymer component that includes nylon-11;(b) a carbon-based particulate conductive filler,wherein the composition has a resistivity at 25.degree. C. of 100 .OMEGA.cm or less and a resistivity at a T.sub.S greater than 150.degree. C. that is at least 10.sup.3 times the resistivity at 25.degree. C.