PTC compositions

Details PTC compositions PTC compositions

1984-03-12

1986-05-27

Barr, Josephine L.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219552, 219553, 252511, 524495, 524496, H05B 102

Patent

active

045917000

ABSTRACT:
Novel PTC conductive polymer compositions contain a mixture of two crystalline polymers of different melting points, the higher melting of the polymers having a melting point which is at least 160.degree. C. and at least 25.degree. C. higher than the melting point of the other polymer. The compositions do not increase in resistivity by a factor more than 2 when maintained at 150.degree. C. for 1000 hours, and are therefore particularly suitable for self-limiting heaters which can be used on apparatus which is periodically subjected to high temperatures, e.g. during steam-cleaning thereof.

REFERENCES:
patent: 3793716 (1974-02-01), Smith-Johannsen
patent: 3823217 (1974-07-01), Kampe
patent: 3861029 (1975-01-01), Smith-Johannsen et al.
patent: 3914363 (1975-10-01), Bedard et al.
patent: 3951871 (1976-04-01), Lloyd et al.
patent: 4188276 (1980-02-01), Lyons et al.
patent: 4237441 (1980-12-01), Van Konynenburg et al.
patent: 4242573 (1980-12-01), Batliwalla

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