METHOD FOR MANUFACTURING POROUS MEMBRANE

摘要

A method for manufacturing a porous membrane according to the present invention comprises the steps of: (I) kneading a resin composition containing both a crystalline resin containing a polyolefin as the main component and a low-molecular-weight substance and shaping the resultant product into a sheet-like form, thereby producing a sheet-like material; (II) substituting the low-molecular-weight substance contained in the sheet-like material by an amphiphilic solvent; (III) subsequent to step (II), substituting the amphiphilic solvent contained in the sheet-like material by water; and (IV) subsequent to step (III), drying the sheet-like material.