| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a polyimide asymmetric membrane which comprises a multi-component polyimide including fluorine atom-containing polyimide and is obtained by controlling the proportion of the fluorine atom-containing polyimide in a dense layer. SOLUTION: The manufacturing method of polyimide asymmetric membrane comprising multi-component polyimide comprises a process (1) of mixing a polyimide component (A) and a polyimide component (B) in such a combination that the number-average polymerization degrees N<SB>A</SB>, N<SB>B</SB>satisfy the expression 1 to prepare a mixed solution of the multi-component polyimide, a process (2) of further polymerizing and imidizing the mixed solution of the multi-component polyimide and a subsequent process (3) of obtaining the asymmetric membrane according to a phase transition method by using the mixed solution of the multi-component polyimide. COPYRIGHT: (C)2006,JPO&NCIPI
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