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Title:
POROUS POLYOLEFIN FILM
Document Type and Number:
WIPO Patent Application WO/2019/163935
Kind Code:
A1
Abstract:
This porous polyolefin film: has a shutdown temperature of 133°C or lower; a porosity of 41% or higher; a value of 12,500 or higher for (longitudinal (MD) direction tensile elongation (%) × longitudinal (MD) direction tensile strength (MPa) + width (TD) direction tensile elongation (%) × width (TD) direction tensile strength (MPa))/2; and satisfies formula (1),where TSD (°C) is the shutdown temperature and Tm (°C) is the lowest melting point of the melting points of respective layers. Formula (1): Tm - TSD ≥ 0 Provided is a porous polyolefin film that offers excellent safety against internal short-circuit, thermal runaway, or the like without lowering the permeability of conventional microporous membranes.

Inventors:
TOYOTA NAOKI (JP)
SHIMOKAWATOKO HARUKA (JP)
ISHIHARA TAKESHI (JP)
KUMA TAKUYA (JP)
Application Number:
JP2019/006736
Publication Date:
August 29, 2019
Filing Date:
February 22, 2019
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J9/26; H01G9/02; H01G11/52; H01M2/16
Domestic Patent References:
WO2017170289A12017-10-05
WO2015146579A12015-10-01
Foreign References:
JP2013517152A2013-05-16
JP2012501357A2012-01-19
JP2009108323A2009-05-21
JP2008266457A2008-11-06
JP2009138159A2009-06-25
JP2015208893A2015-11-24
JPH11322989A1999-11-26
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