| 摘要 |
PURPOSE:To obtain a hollow fibrous membrane of which the separation capacity is highly held and the thermal deformation ratio at 121 deg.C for 20min in a free state is 2% or less, by reducing the number of solute impervious pores while holding the number of solute pervious pores. CONSTITUTION:Cellulose ester is dissolved in a solvent such as N-methyl-2- pyrrolidone or dimethylformamide and polyethylene glycol being a swelling agent and the resulting solution is spun into a hollow yarn shape along with an internal solution consisting of the same solvent and the same swelling agent. This spun hollow yarn is guided to a coagulation bath consisting of the same solvent and the same swelling agent. In this case, the value calculated by subtracting the concn. of the solvent and swelling agent in the internal solution from that of the solvent and swelling agent in the coagulation bath is set to 0-20. Because each of the change ratios of the hollow yarn in the axial and diameter directions, after said yarn was immersed in water at 121 deg.C for 20min in such a state that both ends thereof are made free, can be suppressed to 2% or less, autoclave sterilization in water at 121 deg.C, in such a state that both ends are fixed, is enabled.
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