Electrical devices comprising cross-linked conductive polymers

Details Electrical devices comprising cross-linked conductive polymers Electrical devices comprising cross-linked conductive polymers

1985-03-14

1988-02-09

Shaw, Clifford C.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 22SD, 219549, 219553, H01C 710

Patent

active

047244178

ABSTRACT:
Electrical devices containing PTC conductive polymers which have been cross-linked in two steps, preferably by radiation. The conductive polymer is heat-treated above the temperature at which it begins to melt between the two cross-linking steps, and/or the cross-linking steps are such that a center section of the conductive polymer, intermediate the electrodes, is substantially more cross-linked than the conductive polymer adjacent the electrodes. The process is particularly useful for the preparation of circuit protection devices which are subject to high voltage faults.

REFERENCES:
patent: 3351882 (1967-07-01), Kohler
patent: 3861029 (1975-01-01), Smith-Johannsen
patent: 4304987 (1981-12-01), van Konynenburg
patent: 4317027 (1982-02-01), Middleman et al.
patent: 4352083 (1982-09-01), Middleman et al.
patent: 4388607 (1983-06-01), Toy et al.
patent: 4534889 (1985-08-01), van Konynenburg et al.
patent: 4591700 (1986-05-01), Sopory

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