Title:
MICROPOROUS MEMBRANE, BATTERY SEPARATOR AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2013241594
Kind Code:
A
Abstract:
To provide a split resistant battery separator which is a thin microporous shutdown separator and has sufficient strength so that the hole may not open with easiness.
A microporous membrane comprises at least 80 wt.% of a polymer selected from the group consisting of polypropylene, polyethylene and their copolymer and has at least about 50 kgf/cm2 of lateral resistance to cleavage. The microporous membrane is prepared by processes comprising a step of extruding a film precursor by a blown film method at a blow-up ratio of at least about 1.5, a step of annealing the film precursor, and a step of drawing the annealed film precursor to form the microporous membrane. The multilayer shutdown separator is made of the microporous membrane.
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Inventors:
CALLAHAN ROBERT W
CALL RONALD W
HARLESON KEN J
YU TA-HUA
CALL RONALD W
HARLESON KEN J
YU TA-HUA
Application Number:
JP2013104620A
Publication Date:
December 05, 2013
Filing Date:
May 17, 2013
Export Citation:
Assignee:
CELGARD INC
International Classes:
C08J9/00; B01D67/00; B01D69/02; B01D71/26; B29C55/04; B29C55/06; H01M6/50; H01M50/406; H01M50/417; H01M50/451; H01M50/489; H01M50/494; B29C55/28; H01M10/052; H01M10/36
Domestic Patent References:
| JPH10306168A | 1998-11-17 | |||
| JPH10258462A | 1998-09-29 |
Attorney, Agent or Firm:
Seiji Ohno
Reiko Tanaka
Ken Kitano
Reiko Tanaka
Ken Kitano