PTC devices and their composition

Details PTC devices and their composition PTC devices and their composition

1990-04-04

1991-09-03

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219504, 219505, 219528, 219548, 338 22R, 338214, 252510, 252511, 264105, H05B 300

Patent

active

050456733

ABSTRACT:
PTC Devices and PTC compositions described herein comprise a blend of at least three carbon blacks as a particulate filler in a fluorinated polymer to achieve a substantial PTC effect and operability over a wide temperature range including temperatures prevailing in a steam environment. Two of the carbon blacks are selected to impart PTC effect to the composition. The third carbon black is selected to adjust the resistive properties of the composition into the range of commercial usage and to impart uniformity of the resistive properties within a given batch as well as from one batch of mix to the next.

REFERENCES:
patent: 3861029 (1975-01-01), Smith-Johannsen et al.
patent: 4277673 (1981-07-01), Kelly
patent: 4327480 (1982-01-01), Kelly
patent: 4348584 (1982-09-01), Gale et al.
patent: 4367168 (1983-01-01), Kelly
patent: 4459473 (1984-07-01), Kamath
patent: 4591700 (1986-05-01), Sopory
patent: 4629869 (1986-12-01), Bronnvall
patent: 4866253 (1989-09-01), Leder
Narkis Article at pp. 1163-115, vol. 22, Journal of Applied Polymer Science, 1978.
Cabot Corporation Technical Report S-136 entitled "Carbon Blacks for Specialty Applications".

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