| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a porous membrane by which shrinkage of a porous membrane is controlled, problems of defective chuck and reduction in porosity are effectively prevented and a method for producing a separator for a battery. SOLUTION: In the method for producing a porous membrane comprising a process for removing a low-molecular substance from the porous membrane 15 containing a low-molecular-weight substance by using a cleaning solvent after film formation and then drying the porous membrane 15, the method comprises a process for removing the low-molecular-weight substance from the porous membrane 15 by using the cleaning solvent, a process for immersing the porous membrane 15 in a low-boiling solvent 11 that has a boiling point lower than that of the cleaning solvent and is not compatible with water to replace the cleaning solvent 11 and a process for pulling up the porous membrane 15 from an immersion bath 10 while forming a water membrane 12a and drying the membrane in an vapor-phase atmosphere. COPYRIGHT: (C)2006,JPO&NCIPI |
