PCT heater cable composition and method for making same

Details PCT heater cable composition and method for making same PCT heater cable composition and method for making same

1990-06-01

1992-05-12

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219528, 219549, 219553, 252510, 252511, 29611, H05B 310

Patent

active

051130580

ABSTRACT:
A self-temperature regulating heater cable using a PTC polymeric matrix is described. A commercially available low density polyethylene is combined with a desired carbon black so as to enable a continuous extrusion at an elevated temperature while enabling residual heat in the extruded PTC layer to anneal the layer to a desired low resistivity in a short time period before quenching. The polyethylene is of the DFD-6005 type in which the amount of molecules whose molecular weight does not exceed about 23,000 is less than about eight percent by weight. The carbon black preferably is a low structure, low resistivity, non-surface treated, conductive carbon black.

REFERENCES:
patent: 3914363 (1975-10-01), Bedard et al.
patent: 4286376 (1981-09-01), Smith-Johannsen et al.
patent: 4327480 (1982-05-01), Kelly
patent: 4426339 (1984-01-01), Kamath et al.
patent: 4668857 (1987-05-01), Smuckler
patent: 4783587 (1988-11-01), Ishii et al.
patent: 4866253 (1989-09-01), Kamath et al.
patent: 4908156 (1990-03-01), Dalle et al.
Wire and Cable-Union Carbide DFD-6005 Natural Union Carbide Co.

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