Method for preparing microporous polyolefin film by thermally-induced phase separation method
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United States of America Patent
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Oct 31, 2017
Grant Date -
Jan 15, 2015
app pub date -
Jul 28, 2014
filing date -
Jan 26, 2012
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Abstract
The present invention discloses a method for preparing a microporous polyolefin film comprising: a step of injecting a composition comprising polyolefin 30 to 60 wt % and a diluent mixture comprising a diluent, which can make liquid-liquid phase separation with the polyolefin thermodynamically 40 to 70 wt %, into an extruding machine, and melting and kneading thereof to prepare a single phase melt; and a step of extruding the melt while conducting liquid-liquid phase separation by passing through a section having the temperature below the liquid-liquid phase separation temperature and forming thereof in the form of a sheet, and a microporous polyolefin film prepared according to the method.
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