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. 12, 2021
Filed:
Sep. 22, 2017
Oji Holdings Corporation, Tokyo, JP;
Takeshi Tominaga, Tokyo, JP;
Michiko Sueyoshi, Tokyo, JP;
Yoshimune Okuyama, Tokyo, JP;
Masahiro Nakata, Tokyo, JP;
Tadakazu Ishiwata, Tokyo, JP;
Oji Holdings Corporation, Tokyo, JP;
Abstract
A biaxially stretched polypropylene film including a polypropylene resin and satisfying the following: (a) the crystallite size S, which is determined using the Scherrer equation from the full width at half maximum of the α-crystal (040) plane reflection peak as measured by wide-angle x-ray diffraction after treatment for 200 hours at 105° C., is not more than 12.9 nm; and (b) the planar orientation coefficient ΔP, which is calculated from the birefringence values ΔNyz and ΔNxz with respect to the thickness direction as determined by optical birefringence measurement after treatment for 200 hours at 105° C., is at least 0.013 (ΔP=(ΔNyz+ΔNxz)/2).