H - Electricity – 05 – B
Patent
H - Electricity
05
B
31/158, 309/85,
H05B 3/10 (2006.01) H01B 1/24 (2006.01) H01B 13/14 (2006.01) H01C 7/02 (2006.01) H05B 3/14 (2006.01) H05B 3/56 (2006.01)
Patent
CA 1138186
Abstract: Disclosed are improved melt processable, self- temperature regulating, irradiation cross-linkable, electrically semi-conductive polymeric compositions (5) which in conjunction with annealing at a temperature at or above their melt point temperatures subsequent to their having been radiation cross-linked provide for improved self-temperature regulating electrical heating devices (1) including flexible electrical heating cables. Heating cables (1) made in accordance with the invention comprise two or more elongate substantially parallel spaced-apart electrical conductors that are electrically interconnected by means of extruded forms of the com- positions which have been annealed at a temperature at or above their melt point temperatures prior and subsequent to their having been cross-linked by irradia- tion. The compositions of the invention have an amount of electrically conductive particles, such as carbon black, dispersed therein, that is controlled within the range of 17% to 25% by weight to the total weight of the compositions.
333556
Borden Ladner Gervais Llp
Corporation Eaton
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