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:
Oct. 01, 2019
Filed:
Sep. 30, 2014
Oji Holdings Corporation, Tokyo, JP;
Masahiro Nakata, Tokyo, JP;
Kazuo Ikeda, Tokyo, JP;
Tadakazu Ishiwata, Tokyo, JP;
Akihiro Kakehi, Tokyo, JP;
Yoshinori Matsuo, Tokyo, JP;
Yuichi Shishido, Tokyo, JP;
Shigeo Murase, Tokyo, JP;
OJI HOLDINGS CORPORATION, Tokyo, JP;
Abstract
Provided is a biaxially stretched polypropylene film for capacitors having a thin thickness and having excellent initial voltage resistance and excellent long-term heat resistance and voltage resistance, and also provided is a metallized polypropylene film for capacitors. The polypropylene film for capacitors is obtained by biaxially stretching a polypropylene resin, the polypropylene film having a crystallite size of 122 Å or less as determined by the Scherrer's equation from the half width of the reflection peak from (040) plane of α-crystal measured by a wide angle X-ray diffraction method, and the polypropylene film having a value of birefringence ΔNyz with respect to a thickness direction of 7.0×10or more and 10.0×10or less as measured by an optical birefringence measurement.