| 摘要 |
PROBLEM TO BE SOLVED: To provide an efficient production method for obtaining a satisfactory porous membrane in which filtering flow rate and fractionation characteristics are compatible with each other. SOLUTION: This production method for the porous membrane comprises a process (1) for obtaining a coagulation by coagulating a dope containing a hydrophobic polymer and a hydrophilic polymer, and a process (2)for drying the coagulation in the mid of a process (3) for eliminating at least a part of the hydrophilic polymer from the coagulation. In this method, as the hydrophilic polymer is eliminated after moving the hydrophilic polymer remaining in an inner layer of a porous layer to a surface layer, the hydrophilic polymer can be eliminated efficiently. COPYRIGHT: (C)2005,JPO&NCIPI
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