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:
Jul. 16, 1996
Filed:
Feb. 25, 1994
Izumi Ishikawa, Chiba, JP;
Hiroyuki Miyata, Narashino, JP;
Thoru Nakatsuka, Tokyo, JP;
Kazuhiko Goto, Sakura, JP;
Kenji Matsui, Tokyo, JP;
Shiro Nakayama, Yachiyo, JP;
Tohru Takahashi, Tokyo, JP;
Mitutaka Tanida, Yachiyo, JP;
Toshio Niwa, Yachiyo, JP;
Fujikura Ltd., Tokyo, JP;
NOF Corporation, Tokyo, JP;
Abstract
A polyethylene composition which is useful in insulations and joints of extra-high voltage power cables, and in which a cross-linking agent, comprising an organic peroxide subjected to purification processing, and an antioxidant, are blended, wherein the cross-linked composition has a dielectric loss tangent (tan.delta.) of less than or equal to 0.07% at a temperature of 90.degree. C. and under an electric field stress of 20 kV/mm. This polyethylene composition exhibits little dielectric loss, even at high temperatures or high electric field stresses, and is optimally employed in insulations and joints for extra-high voltage power cables of 275 kV or more.