The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Sep. 23, 1994
Toshiya Tanaka, Tokyo, JP;
Hitoshi Kimura, Tokyo, JP;
Koji Yamamoto, Yokkaichi, JP;
Mitsugu Ishioka, Yokkaichi, JP;
Setsuo Goto, Yokkaichi, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
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.