H - Electricity – 01 – C
Patent
H - Electricity
01
C
H01C 7/02 (2006.01) H01C 17/00 (2006.01) H01C 17/065 (2006.01)
Patent
CA 2170186
A PTC element comprising a conductive sheet of a crystalline polyolefin matrix and a conductive filler, having provided on both sides thereof an electrode of a metallic foil, the PTC element having a resistivity at 20°C (P20) of not more than 1.8 .OMEGA.cm, a peak resistivity (pp) of not less than 2.0 x 106 .OMEGA.cm, and a temperature difference [Ta (°C) - Tb (°C)] of not greater than 10°C, wherein Ta (°C) is a temperature at which the resistivity is 106 times the resistivity at 20°C (P20) and Tb (°C) is a temperature at which the resistivity is 10 times the resistivity at 20°C (P20). The PTC element is produced by a process comprising mixing a crystalline polyolefin and a conductive filler, molding the mixture into a conductive sheet, press bonding under heat a metallic foil to both sides of the conductive sheet, and repeatedly subjecting the conductive sheet to a heating and cooling cycle consisting of heating at a temperature of not lower than (the melting point of the crystalline polyolefin minus 5°C) and then cooling to a temperature lower than (the melting point of the crystalline polyolefin minus 5°C). The PTC elements exhibit an extremely low resistivity at 20°C and a high resistivity at a peak temperature, showing a very steep increase in resistance in a narrow temperature range.
Asami Keiichi
Echigo Yoshiaki
Ito Akira
Iwaya Yoshiaki
Kajimaru Hiroshi
Riches Mckenzie & Herbert Llp
Unitika Ltd.
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