Title:
POLYOLEFIN MICROPOROUS FILM AND METHOD FOR MANUFACTURING SAME, SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY CELL, AND NONAQUEOUS ELECTROLYTE SECONDARY CELL
Document Type and Number:
WIPO Patent Application WO/2016/024533
Kind Code:
A1
Abstract:
Provided is a polyolefin microporous film having pores with small diameters and excellent shutdown characteristics, and which is suitable for a separator for a nonaqueous electrolyte secondary cell. The polyolefin microporous film is characterized in that the difference between the shutdown start temperature in the MD direction and the temperature at maximum shrinkage in the MD direction is 8.6°C or greater, and the maximum pore diameter thereof is less than 0.036 µm. Also provided is a method for manufacturing the polyolefin microporous film, characterized by comprising melt-kneading and molding into a sheet shape a plasticizer and a polyolefin resin including an ultrahigh-molecular-weight polyolefin, stretching the resultant sheet in the MD direction and performing simultaneous biaxial stretching thereof, and then drying the stretched sheet.
Inventors:
TOYOTA NAOKI (JP)
SUGATA MASAMI (JP)
ISHIHARA TAKESHI (JP)
SUGATA MASAMI (JP)
ISHIHARA TAKESHI (JP)
Application Number:
PCT/JP2015/072446
Publication Date:
February 18, 2016
Filing Date:
August 07, 2015
Export Citation:
Assignee:
TORAY BATTERY SEPARATOR FILM (JP)
International Classes:
C08J9/26; H01M10/0566; H01M50/406; H01M50/417; H01M50/491; H01M50/494
Domestic Patent References:
| WO2010106984A1 | 2010-09-23 | |||
| WO2012081556A1 | 2012-06-21 |
Foreign References:
| JP2005343958A | 2005-12-15 | |||
| JP2002355938A | 2002-12-10 | |||
| JP2010194726A | 2010-09-09 | |||
| JP2005343957A | 2005-12-15 | |||
| JP2002284918A | 2002-10-03 |
Other References:
See also references of EP 3181621A4
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