| 摘要 |
PURPOSE:To produce the titled porous hollow yarn while omitting one step, by pouring an emulsion of a specified high-molecular substance into the core of a spinning dope extruded through an annular hollow nozzle, coagulating and drying it and introducing exchanging groups thereto. CONSTITUTION:A spinning dope prepared by dissolving a high-molecular substance such as polyvinyl fluoride in a solvent miscible with a coagulant solution is extruded from the external annulus of an annular hollow nozzle. At the same time, a pouring solution comprising an emulsion or an aqueous solution prepared by dispersing, in water, an organic solvent solution of a high-molecular substance to which ion-exchanging groups can be introduced (e.g., polyethylene-imine) is poured from the internal hollow portion of the nozzle into the core of the spinning dope extruded in the annular form, and the annular dope is allowed to drop freely into a water or water-based coagulant bath and coagulated into a porous hollow yarn. This hollow yarn is immersed in a coagulant solution to remove completely the solvent in the spinning dope. After sealing the ends of the fiber, the fiber is dried. This fiber is immersed in a solution of cyanuric chloride or the like to introduce ion exchanging groups thereto. |
