| 摘要 |
PURPOSE:To obtain a hollow yarn like membrane excellent in water permeability and strength, by extruding a film forming solution wherein aromatic polysulfone and a solvent, which is mixed with a polar org. solvent capable of dissolving said polysulfone but does not dissolve said polysulfone, are dissolved in said polar solvent from the outer tube of a double tube type nozzle while flowing out an inside coagulating liquid from the inner tube of said nozzle. CONSTITUTION:In a polar solvent capable of dissolving aromatic polysulfone, a solvent which is mixed with said solvent but does not dissolve said polysulfone or an inorg. salt dissolved in the polar org. solvent or both of them and said polysulfone are dissolved and contained to prepare a film forming solution. This film forming solution is extruded into an outside coagulating liquid from the outer tube of a double tube type nozzle while an inside coagulating liquid the temp. of which differs 10 deg.C or more as compared with the outside coagulating liquid is flowed out from the inner tube of said nozzle and the extrudate is coagulated and subjected to solvent removal treatment to prepare an aromatic polysulfone hollow yarn like membrane.
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