Polyethylene for an insulation layer of a power cable and a cros

Details Polyethylene for an insulation layer of a power cable and a cros Polyethylene for an insulation layer of a power cable and a cros

1994-09-23

1996-05-28

Ryan, Patrick J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428383, 174110PM, 174120SR, B32B 1500, D02G 300

Patent

active

055210104

ABSTRACT:
A polyethylene for an insulation layer of a power cable, of which the dissipation factor never increases even in a high-temperature, high electric field, and a crosslinked polyethylene insulated power cable which uses this polyethylene so that the high-temperature dielectric breakdown voltage is large enough for high-capacitance transmission. This polyethylene is a low-density polyethylene which is synthesized by high-pressure radical polymerization of ethylene, and has properties including: a melt flow rate of 0.1 to 10 g/10 minutes; a density of 0.915 to 0.935 g/cm.sup.3 ; an absorbance of 0.03 to 1.0 for a ketone-type carbonyl group, having a peak in a position corresponding to a wave-number of 1,725.+-.4 cm.sup.-1 in an infrared absorption spectrum, an absorbance of 1.0 or less for an ester-type carbonyl group, having a peak in a position corresponding to a wave-number of 1,743.+-.4 cm.sup.-1 and absorbances of less than 0.03 for other carbonyl groups; and/or a content of 3% by weight or less for components eluted at a temperature not lower than an elution temperature T (.degree.C.) calculated as T=687.times.D-547, where D (g/cm.sup.3) is the density of the low-density polyethylene, in a CFC measurement.

REFERENCES:
patent: 3684821 (1972-08-01), Miyauchi et al.
patent: 4400429 (1983-08-01), Barlow et al.

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