Title:
POROUS FILM, SEPARATOR FOR BATTERY USING THE SAME AND BATTERY
Document Type and Number:
Japanese Patent JP2015004017
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a porous film that has excellent air permeability and strength characteristics, to provide a separator for a battery that has excellent air permeability and strength characteristics contributing to battery performance in particular and has a pore size corresponding to a high output of the battery and to provide a method of manufacturing the separator for a battery.SOLUTION: A porous film is composed of a resin composition including (A) a polypropylene resin and (B) one or more kinds of ethylene copolymer selected from the group consisting of an ethylene-α-olefin resin and an ethylene-(meth)acrylic acid ester resin, has a mixing mass ratio (A)/(B) in the resin composition of 88/12 to 70/30, has β-crystal activity and has an air permeability of less than 500 sec/100 ml. in the porous film, the tensile strength Ein the flow direction (MD) of the porous film is not less than 100 MPa; the tensile strength Ein the vertical direction (TD) with respect to the flow direction is less than 100 MPa; and the ratio (E/E) of the Eto the Eis not less than 3 to less than 10.
Inventors:
MUTA TAKATOSHI
NEMOTO TOMOYUKI
NEMOTO TOMOYUKI
Application Number:
JP2013131082A
Publication Date:
January 08, 2015
Filing Date:
June 21, 2013
Export Citation:
Assignee:
MITSUBISHI PLASTICS INC
International Classes:
C08J9/00; C08L23/08; C08L23/10; H01M2/16
Domestic Patent References:
| JP2013032505A | 2013-02-14 | |||
| JP2012007156A | 2012-01-12 | |||
| JP2012117047A | 2012-06-21 |
Foreign References:
| WO2010107023A1 | 2010-09-23 | |||
| WO2013054931A1 | 2013-04-18 | |||
| WO2012105660A1 | 2012-08-09 | |||
| WO2013054932A1 | 2013-04-18 | |||
| WO2002066233A1 | 2002-08-29 |
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