MICROPOROUS STRETCHED CELLULOSE NANOFIBER-CONTAINING POLYOLEFIN FILM, METHOD FOR PRODUCING MICROPOROUS STRETCHED CELLULOSE NANOFIBER-CONTAINING POLYOLEFIN FILM, AND SEPARATOR FOR NONAQUEOUS SECONDARY BATTERIES

WIPO Patent Application WO/2013/035786

A1

Provided is a method for producing a microporous stretched film having high puncture strength and the like. The method comprises: a first step wherein cellulose nanofibers and a polyolefin resin are melt-kneaded, so that the nanofibers are dispersed in the resin; a second step wherein the water content is removed from the kneaded material obtained in the first step; a third step wherein a plasticizer is mixed and melt-kneaded with the nanofibers and the resin, so that a polyolefin resin composition is obtained; a fourth step wherein the polyolefin resin composition is extrusion molded; a fifth step wherein the extrusion molded body obtained in the fourth step is stretched and formed into a film; and a sixth step wherein the plasticizer is extracted from the film.

NAKAMURA SATORU (JP)
KUSHIZAKI YOSHIYUKI (JP)
ISHIGURO RYOU (JP)
YOSHIOKA MARIKO (JP)

PCT/JP2012/072739

March 14, 2013

September 06, 2012

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JAPAN STEEL WORKS LTD (JP)
NAKAMURA SATORU (JP)
KUSHIZAKI YOSHIYUKI (JP)
ISHIGURO RYOU (JP)
YOSHIOKA MARIKO (JP)

C08J9/26; B82Y30/00; H01M50/406; H01M50/411; H01M50/489; H01M50/491

WO2010008003A1	2010-01-21
WO2011118361A1	2011-09-29
WO2012017954A1	2012-02-09

JP2009293167A	2009-12-17
JP2003123724A	2003-04-25
JPH0680832A	1994-03-22

Shin-Ei Patent Firm, P. C. (JP)
Patent business corporation Shin-Ei Patent Firm (JP)

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