Title:
PRODUCTION METHOD FOR POLYOLEFIN MICROPOROUS FILM
Document Type and Number:
WIPO Patent Application WO/2020/148946
Kind Code:
A1
Abstract:
This production method for a polyolefin microporous film includes a step for supplying a polyolefin resin and a plasticizer to an extruder and melting and kneading the polyolefin resin and the plasticizer inside the extruder, wherein after the resin has been introduced into the extruder, an inert gas is supplied to the extruder from a prescribed location on the extruder while the temperature of the resin is at or below the initial oxidation temperature, and the resin composition is melted and kneaded in an inert gas atmosphere. By preventing oxidative degradation during the melt-processing of the polyolefin in the production process, the present invention suppresses the occurrence of abnormalities in the character of the resin and provides a polyolefin microporous film that has an excellent surface appearance, has excellent film strength uniformity, and can be discharged from the extruder with excellent precision.
Inventors:
SATO GO (JP)
SATO AI (JP)
SATO AI (JP)
Application Number:
PCT/JP2019/038555
Publication Date:
July 23, 2020
Filing Date:
September 30, 2019
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C08J9/26; B29C67/20; B29K23/00; B29L7/00
Domestic Patent References:
| WO2018164057A1 | 2018-09-13 | |||
| WO2011062176A1 | 2011-05-26 |
Foreign References:
| JP2008106237A | 2008-05-08 | |||
| JP2006124652A | 2006-05-18 | |||
| JP2002338728A | 2002-11-27 | |||
| JP2010215901A | 2010-09-30 | |||
| JP2011255652A | 2011-12-22 | |||
| JP2001079830A | 2001-03-27 | |||
| JPH06104736B2 | 1994-12-21 | |||
| JP2002256099A | 2002-09-11 |
Other References:
See also references of EP 3913015A4
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