| 摘要 |
PURPOSE:To improve durability and to increase a permeation speed, by forming a multilayer composite hollow yarn membrane by alternately laminating a separation membrane layer having a thickness of 1mum or less composed of an oxygen permeable polymer and a porous membrane layer composed of a crystalline polymer. CONSTITUTION:A polymer (polymer a') having oxygen separation factor of 3 or more and a crystalline polymer (polymer b') having a m.p. of 170-250 deg.C are alternately arranged and the polymer b' is arranged on inner and outer surface sides and the polymers a', b' are subjected to melt composite spinning using a multiple cylindrical nozzle. Subsequently, the composite spun yarn is stretched to make the part of the polymer b' of the polymer a' porous to obtain an oxygen enriching multilayer composite hollow yarn membrane wherein a separation membrane layer A' with a thickness of 1mum or less composed of the polymer a' and porous membrane layer B' composed of the polymer b' are alternately laminated and said layers B' are arranged on the inner and outer surface sides. As the polymer a', poly-4-methylpentene-1 having thermal deformation temp. of 75-85 deg.C is pref.
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