| 摘要 |
PCT No. PCT/SE83/00382 Sec. 371 Date Jul. 12, 1984 Sec. 102(e) Date Jul. 12, 1984 PCT Filed Nov. 8, 1983 PCT Pub. No. WO84/02048 PCT Pub. Date May 24, 1984.A self limiting electrical heating device with an electrical resistance material the resistivity of which is changed by more than a power of (10) within a predetermined, narrow temperature interval and which is arranged between electrical conductors connectable to a voltage source, the conductors and the resistance material being enclosed in an electrically insulating cover. The electrical resistance material (2) comprises: (1) an electrically relatively non-conducting crystalline, monomeric substance which melts within or near the predetermined, narrow temperature interval and which constitutes the outer phase, (2) particles of one or more electrically conducting materials(s), distributed in the non-conducting material, (3) one or more non-conducting powdered or fibrous fillers, which are insoluable in the non-conducting material and which have a considerably higher melting point than this material, similarly distributed in the non-conducting material, whereby the weight ratio between components (1) and (3) is from 10:90 to 90:10.
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