| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation membrane exhibiting high selectivity and excellent permeability to acid gas. SOLUTION: A coating liquid based on the fluorine-containing polyimide resin, for example, shown by formula 1 and an organic solvent is applied to the surface of a porous support, which is then immersed in a water-based solidifying liquid to form a thin film comprising the fluorine-containing polyimide resin. Such a polar solvent, for example diethylene glycol dimethyl ether or triethylene glycol dimethyl ether, is used as the organic solvent, as has 5.5×10-6 cm2/second self-diffusion coefficient at 25 deg.C when the organic solvent is incorporated in heavy water by 10 wt.%.
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