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. 20, 2008
Filed:
Aug. 26, 2003
Masayuki Adachi, Fuji, JP;
Takashi Ikemoto, Moriyama, JP;
Hiroshi Sogo, Moriyama, JP;
Asahi Kasei Chemicals Corporations, Tokyo, JP;
Abstract
The invention relates to a microporous membrane, which is provided with high safety even under a condition that the interior temperature of a battery becomes high, and which has high permeability and high mechanical strength at the same time. The polyolefin microporous membrane is characterized by a membrane thickness of 5 to 50 μm, a void content of 30 to 60%, a gas transmission rate of 40 to 300 sec/100 cc/20 μm, a piercing strength of not less than 2.5 N/20 μm and a break through temperature of not lower than 110° C. The separator in accordance with the present invention is used to exhibit high safety under a high temperature condition as well as high permeability, and therefore it is particularly useful as a separator for miniaturized high capacity batteries of a non-aqueous electrolytic solution type.