Electrical resistance element

Details Electrical resistance element Electrical resistance element

1993-09-17

1995-05-16

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 22SD, 338 23, 338223, 338224, H01C 710

Patent

active

054164621

ABSTRACT:
An electrical resistance element having a resistance body between two contact terminals. The resistance body has PTC behavior and is composed of a polymer matrix and a filler component embedded in the polymer matrix. The filler component is composed of electrically conducting particles. Although the element is of simple and inexpensive construction, the resistance element is notable for good electrical conductivity in the low-resistance state and for a low response time for the PTC transition from the low-resistance to the high-resistance state. This is achieved as a result of the fact that at least some of the electrically conducting particles are formed as composite bodies having electrically conducting surfaces and/or as hollow or porous bodies composed of electrically conducting material. These particles have a lower specific density and/or lower specific heat capacity than solidly formed particles composed of conductive material.

REFERENCES:
patent: 4534889 (1985-08-01), van Konynenburg et al.
patent: 4616125 (1986-10-01), Oppitz
"Anwendungen elektrisch leitfahiger Kunststoffe", Mair, Leitende Kunststoffe fur elektrotechnische Erzeugnisse, 1986, pp. 10-16.
"Temperaturabhangigkeit des elektrischen Widerstands", Klehiheins, Anwendungen strahlungsvernetzter leitfahiger Kunststoffe, 1986, pp. 80-81, 89-90.
"Fullstoffhaltige elektrisch leitfahige Kunststoffe", Mobius, Kunststoffe 78 (1988), pp. 53-58.
"Elektrisch leitende Kunststoffe", Mair, Werkstoffe, 1988, pp. 946-951.
"Elektrisch leitfahige Polymere", Munstedt, Kunststoffe 79, 1989, pp. 510-514.

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