MICROPOROUS FILM, AND METHOD FOR PRODUCING SAME

Title:

MICROPOROUS FILM, AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2021/153792

Kind Code:

A1

Abstract:

Provided is a microporous film which has a surface A and a surface B opposite to the surface A. In one embodiment, the microporous film has a ratio (FB/FA) of a dynamic friction coefficient FB of the surface B to a dynamic friction coefficient FA of the surface A of 1.2 to 20. In another embodiment, the microporous film is a single layer having a thickness of 3-18 μm, a number NA of pores on the surface A is 10-100/μm2, a number NB of pores on the surface B is 20-200/μm2, and NA/NB is 0.2-0.96. In addition, a total area SA of pores on the surface A is 0.02-0.5 μm2/μm2, a total area SB of pores on the surface B is 0.01-0.3 μm2/μm2, and SA/SB is 1.1-10. Furthermore, in another embodiment, a number WB of protrusion-like bodies on the surface B is 0.2-1000/100 μm2.

Inventors:

SAKAKIBARA YUZURU (JP)
ZHANG XUN (JP)
SATO YUKA (JP)
MIZOBUCHI KOSUKE (JP)

Application Number:

PCT/JP2021/003415

Publication Date:

August 05, 2021

Filing Date:

January 29, 2021

Export Citation:

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Assignee:

ASAHI CHEMICAL IND (JP)

International Classes:

B32B5/18; C08J9/26; H01M50/409

Domestic Patent References:

WO2004024808A1	2004-03-25
WO2018180713A1	2018-10-04

Foreign References:

JP2004099799A	2004-04-02
JP2009001817A	2009-01-08
JP2010036355A	2010-02-18
JPH11123799A	1999-05-11
JP2011051330A	2011-03-17
JP2009114434A	2009-05-28
JP2017029338A	2017-02-09
JPH05258741A	1993-10-08
JP5596768B2	2014-09-24

Other References: