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:
Feb. 14, 2017
Filed:
Jan. 25, 2013
Mitsubishi Paper Mills Limited, Tokyo, JP;
Hiroo Kaji, Tokyo, JP;
Toshihiro Shigematsu, Tokyo, JP;
Nobuaki Hirota, Tokyo, JP;
Hiroshi Matsuda, Tokyo, JP;
MITSUBISHI PAPER MILLS LIMITED, Tokyo, JP;
Abstract
A base material for a lithium ion secondary battery separator provided by the present invention comprises a polyethylene terephthalate fiber, in which an average fiber diameter of the polyethylene terephthalate fiber is 9.0 μm or less, a specific X-ray diffraction intensity derived from the polyethylene terephthalate fiber is 300 cps/(g/m) or more, and a coefficient of variation of a specific X-ray diffraction intensity is 12.0% or less, and is excellent in the workability during production and excellent in mechanical strength, uniformity and handling in a subsequent treatment step.