PTC compositions

Details PTC compositions PTC compositions

1987-02-26

1989-07-18

Barr, Josephine

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252503, 252506, 252512, 252513, 252518, 252514, 264105, 524495, 524496, 524433, 524492, 524439, 524440, 524493, 219553, H01B 106

Patent

active

048491330

ABSTRACT:
A PTC composition comprising at least one polymer, from 5% to 45% by volume of electrically conductive or semiconductive particles having a room temperature electric conductivity of at least 10.sup.2 [s/m] dispersed in said polymer, and from 0.2% to 20% by volume of thermally conductive particles having a room temperature electric conductivity of no more than 10.sup.-3 [s/m] and a thermal conductivity of at least 20 [w/m.multidot.k] dispersed in said polymer. A PTC device using such a PTC composition has a high ratio of peak resistance to room temperature resistance, and exhibits high safety.

REFERENCES:
patent: 4388607 (1983-06-01), Toy et al.
patent: 4514620 (1985-04-01), Cheng et al.
patent: 4560498 (1985-12-01), Horsma et al.
patent: 4629869 (1986-12-01), Bronnwall
patent: 4732701 (1988-03-01), Nishii et al.

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