| 摘要 |
PURPOSE:To obtain hydrophilic porous membrane causing no decrease of strength nor swelling by wetting and generating no eluted substance, by providing a layer of ethylene/vinyl alcohol copolymer having specified ethylene content and degree of saponification covering the surface of pores of polyolefin matrix having a porous structure. CONSTITUTION:A porous structure comprising polyolefin matrix obtd. by drawing perforation method is immersed in a soln. dissolving ethylene/vinyl alcohol copolymer having 20-70mol% ethylene content and above 80% degree of saponification in aq. ethanol, then the matrix is dried and the solvent is removed by evaporation. The compound porous membrane obtd. by this method has good wettability for water, permitting treatment of aq. liquid without any particular pretreatment, having also high mechanical strength and dimensional stability in the wet state. Further, no elutable substance such as surface active agent is used for the prepn., the membrance has superior medical stability. Accordingly, the membrance is effective for separation of blood components.
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