Title:
POROUS POLYMER FILM
Document Type and Number:
Japanese Patent JP3536607
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a film high in strength in a shutdown temperature range, capable of attaining a complete shutdown, excellent in shape retaining properties during melting, etc., by making the modulus of elasticity in a shutdown temperature range a specific value or higher than it in a drawn porous film.
SOLUTION: This drawn porous polymer film has ≥104 dyne/cm2, preferably ≤1011 dyne/cm2 modulus of elasticity in a shutdown temperature range. The porous film is preferably subjected to shutdown substantially by shrinkage in a shutdown temperature range and the shrinkage factor required for shutdown is generally several % or more, preferably 5-90% in a shutdown temperature. The main shrinkage direction is preferably the longitudinal direction of the porous polymer film. This porous film is preferable as a separator for batteries and a permeable membrane for electrolytic capacitor, etc.
Inventors:
Kiuchi, Masayuki
Fujii, Teruaki
Fujii, Teruaki
Application Number:
JP22624097A
Publication Date:
June 14, 2004
Filing Date:
August 22, 1997
Export Citation:
Assignee:
UBE IND LTD
International Classes:
C08J9/00; B29C55/02; B32B5/18; B32B5/32; H01G9/02; H01M2/16; B29K23/00; B29L9/00; (IPC1-7): C08J9/00
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