Title:
POLYOLEFIN MULTILAYER MICROPOROUS MEMBRANE, METHOD FOR PRODUCING THE SAME, BATTERY SEPARATOR AND BATTERY
Document Type and Number:
WIPO Patent Application WO/2007/117005
Kind Code:
A1
Abstract:
Disclosed is a polyolefin multilayer microporous membrane which comprises first microporous layers forming at least the both surface layers and at least one second microporous layer arranged between the surface layers. The first layers contain a first polyethylene resin wherein the content of super high molecular weight polyethylenes having a weight average molecular weight of not less than 1 X 106 is not less than 8% by mass, and the second layer contains a second polyethylene resin wherein the super high molecular weight polyethylene content is not more than 7% by mass. The polyolefin multilayer microporous membrane has a structure which has at least two peaks in the pore size distribution curve obtained by mercury intrusion porosimetry, and the total thickness of the first layers is 15-60% when the total thickness of the first and second layers is taken as 100%.
Inventors:
TAKITA, Kotaro (200-8-202, Tayuuduka 2-chome Nasushiobara-shi Tochigi, 35, 3292735, JP)
滝田 耕太郎 (〒35 栃木県那須塩原市太夫塚２－２００－８－２０２ Tochigi, 3292735, JP)
滝田 耕太郎 (〒35 栃木県那須塩原市太夫塚２－２００－８－２０２ Tochigi, 3292735, JP)
Application Number:
JP2007/057858
Publication Date:
October 18, 2007
Filing Date:
April 09, 2007
Export Citation:
Assignee:
TONEN CHEMICAL CORPORATION (8-15, Kohnan 1-chome Minato-ku Tokyo, 05, 1088005, JP)
東燃化学株式会社 (〒05 東京都港区港南１丁目８－１５ Tokyo, 1088005, JP)
TAKITA, Kotaro (200-8-202, Tayuuduka 2-chome Nasushiobara-shi Tochigi, 35, 3292735, JP)
東燃化学株式会社 (〒05 東京都港区港南１丁目８－１５ Tokyo, 1088005, JP)
TAKITA, Kotaro (200-8-202, Tayuuduka 2-chome Nasushiobara-shi Tochigi, 35, 3292735, JP)
International Classes:
B32B27/32; H01M2/16; C08J9/00
Attorney, Agent or Firm:
TAKAISHI, Kitsuma (Kagurazaka FN Bldg. 5F, 67 Kagurazaka 6-chom, Shinjuku-ku Tokyo 25, 1620825, JP)
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