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    • 9. 发明公开
    • PROCESS FOR PRODUCTION OF POROUS MEMBRANE
    • VERFAHREN ZUR HERSTELLUNG EINERPORÖSENMEMBRAN
    • EP2557111A1
    • 2013-02-13
    • EP11765901.1
    • 2011-04-05
    • Mitsubishi Rayon Co., Ltd.
    • MINAGAWA MasakazuTERAMACHI Masashi
    • C08J9/28B01D71/34
    • B01D67/0011B01D67/003B01D69/06B01D69/08B01D69/10B01D71/12B01D71/34B01D71/40B01D71/42B01D71/48B01D71/56B01D71/68B01D2323/06B01D2323/22B01D2325/20B01D2325/36C08J9/26C08J2201/0464C08J2327/16
    • Disclosed is a process for production of a porous membrane that includes the steps of: layering a film-forming dope that contains a polymer (A) that forms a membrane base, a polyvinylpyrrolidone (B) and a solvent (C) into a single layer or two or more layers; immersing the film-forming dope in a solidifying fluid that is a non-solvent with respect to the polymer (A) and is a good solvent with respect to the polyvinylpyrrolidone (B); and removing the polyvinylpyrrolidone (B), wherein the polyvinylpyrrolidone (B) has a K value of 50 to 80, a mass ratio r of the polyvinylpyrrolidone (B) to the polymer (A) is 0.5 or more and less than 1, and the viscosity of the film-forming dope at a membrane production temperature is 100 to 500 Pa·s. Accordingly, by using an appropriate amount of a low-molecular-weight hydrophilic polymer capable of being easily removed, it is possible to produce a porous membrane of a three-dimensional network structure in which macrovoids are suppressed, having high water permeability and superior filtration performance.
    • 公开了一种生产多孔膜的方法,其包括以下步骤:将含有形成膜基的聚合物(A),聚乙烯吡咯烷酮(B)和溶剂(C))的成膜原液层压成单层 或两层或多层; 将成膜原液浸渍在相对于聚合物(A)为非溶剂的固化液中,相对于聚乙烯吡咯烷酮(B)为良溶剂; (B)的聚乙烯吡咯烷酮(B)的K值为50〜80,聚乙烯吡咯烷酮(B)与聚合物(A)的质量比r为0.5以上且小于1, 膜生成温度下的成膜原液的粘度为100〜500Pa·s。 因此,通过使用适量的能够容易地除去的低分子量亲水性聚合物,可以制造出抑制大孔,具有高透水性和优异过滤性的三维网状结构的多孔膜 性能。