Heat recoverable article

Details Heat recoverable article Heat recoverable article

1990-04-18

1991-03-26

Envall, Jr., Roy N.

Electric heating

Heating devices

With heater-unit housing, casing, or support means

174DIG8, H05B 300

Patent

active

050031635

ABSTRACT:
A heat recoverable article comprising a conductive polymeric material with particular electrical properties. Preferably, when expanded from X% to Y% to render it recoverable the resistivity of the composition decreases on expansion in at least part of the X-Y expansion range. Preferably the composition exhibits a pseudo PTC ratio (peak resistivity/resistivity at 25.degree. C.) in the range 11/2-10. Preferably the composition has a resistivity which increases on recovery as measured in the direction of current flow, throughout the temperature range 20.degree. C. to T.sub.e (extrapolated end temperature). The article is preferably tubular, and the electrtical behaviour allows it to be conveniently electroded with elongate electrodes, while avoiding overheating during recovery.

REFERENCES:
patent: 4675512 (1987-06-01), Doucet et al.
patent: 4689474 (1987-08-01), Overbergh et al.

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