| 摘要 |
PROBLEM TO BE SOLVED: To improve the stability of the electric resistance of a polymer PTC element when repeating its switching operation, with respect to the polymer PTC element in whose structure electrodes are formed on both surfaces of a sheet-form polymer PTC composition made of a metal-based conductive powder and a binder having a crystalline polymer as the main components thereof. SOLUTION: By adding a thermoplastic elastomer of 0.001-10 pts.wt. to a binder of 100 pts.wt., the bonding property of the interface between the polymer PTC composition and the electrode of the polymer PTC element is improved, and the stability of the polymer PTC composition itself is also improved. Therefore, the stability of the characteristics of the polymer PTC element can be secured. Also, the heat deterioration of the binder can be so suppressed by adding an electrification preventing agent to the polymer PTC composition as to improve further the stability of the characteristics of the polymer PTC element. COPYRIGHT: (C)2004,JPO
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