Organic positive temperature coefficient thermistor and manufact

Details Organic positive temperature coefficient thermistor and manufact Organic positive temperature coefficient thermistor and manufact

1999-01-28

2000-11-07

Kopec, Mark

Compositions

Electrically conductive or emissive compositions

252510, 252511, 252512, 252513, 2525181, 219541, 219546, 338 22R, H01B 100

Patent

active

061432067

ABSTRACT:
An organic positive temperature coefficient thermistor comprising a thermoplastic polymer matrix, a low-molecular organic compound having a melting point that is equal to or greater than 40.degree. C. and less than 100.degree. C. and conductive particles, each having spiky protuberances, is obtained by crosslinking a milled mixture of these components with a silane coupling agent comprising a vinyl group or a (meth)acryloyl group and an alkoxy group. This organic positive temperature coefficient thermistor has sufficiently low resistance at room temperature and a large rate of resistance change between an operating state and a non-operating state, and can be operated at less than 100.degree. C. with a reduced temperature vs. resistance curve hysteresis, ease of control of operating temperature, and high performance stability.

REFERENCES:
patent: 5378407 (1995-01-01), Chandler et al.
patent: 5945034 (1999-08-01), Handa et al.
F. Bueche, J. Appl. Phys., vol. 44, No. 1, pp. 532-533, "A New Class of Switching Materials", Jan. 1973.
Kazuyuki Ohe, et al., Japanese Journal of Applied Physics, vol. 10, No. 1, pp. 99-108, "A New Resistor Having an Anomalously Large Positive Temperature Coefficient", Jan. 1971.
F. Bueche, Journal of Polymer Science, vol. 11, pp. 1319-1330, "Electrical Properties of Carbon Black in an SBR-Wax Matrix", 1973.

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