Electrically conductive self-regulating article
AssigneeE-B Industries, Inc.
InventorCornelius J. N. Kelly
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Abstract
The method of manufacturing, composition and product described herein utilize highly electrically resistive carbon black alone or with low resistivity carbon black to form a self-limiting electrically resistive semi-conductor which presents a positive temperature co-efficient of resistance, the methods which are described providing significantly shortened anneal times, manufacturing ease and reliability.
Claims5
An electrically conductive self-regulating in watts per unit length article comprised of at least two spaced elongated electrodes electrically inter-connected by and embedded in a self-regulating semi-conductive composition exhibiting a positive temperature coefficient of electrical resistance containing carbon black dispersed in a polymeric matrix having at least 20% crystallinity as determined by X-ray diffraction, the improvement wherein the carbon black comprises a high electrical resistivity carbon black which percentage by weight of the total weight of the semi-conductive composition is at least 6% which amount is sufficient to achieve the critical level for electrical conductivity.
Dependencies are inferred from the claim text.