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    • 1. 发明申请
    • HIGHLY DURABLE POROUS PVDF FILM, METHOD OF PRODUCING THE SAME AND WASHING METHOD AND FILTRATION METHOD USING THE SAME
    • 高耐多孔PVDF膜,其制造方法和洗涤方法及使用其的过滤方法
    • US20090101600A1
    • 2009-04-23
    • US12297580
    • 2007-04-16
    • Satoshi ShikiHiroyoshi OhyaNoboru KubotaMakiko Hattori
    • Satoshi ShikiHiroyoshi OhyaNoboru KubotaMakiko Hattori
    • B32B3/26B32B5/14B29C47/88B01D29/62
    • B01D71/34B01D67/0011B01D69/02B01D69/08B01D2323/02B01D2325/30B01D2325/34C08J5/18C08J2327/16Y10T428/24595
    • The present invention provides a PVDF porous film, which has high water permeability and high chemical resistance to washing chemicals and the like that has been difficult to realize with conventional polymer porous films, and which can be used over a prolonged period of time; and a method of producing the same and the like. Namely, the present invention provides a porous film in which the degree of crystallization of the PVDF resin is 50% or more but not more than 90%, and the product of the degree of crystallization of the PVDF resin and the specific surface area of the film is 300 (%·m2/g) or more but not more than 2000 (%·m2/g). In addition, the present invention provides a method for producing a porous film comprising: producing a porous film having a PVDF resin as a main component thereof by extruding, from a molding nozzle, a film-forming solution which at least comprises a hydrophobic polymer component having a PVDF resin as a main component thereof, a hydrophilic polymer component and a common solvent for both the hydrophobic and hydrophilic polymer components, and solidifying the film-forming solution in a solution having water as a main component thereof, wherein polyethylene glycol having a weight average molecular weight of 20,000 or more but not more than 150,000 is used as the hydrophilic polymer component.
    • 本发明提供一种PVDF多孔膜,该PVDF多孔膜对于常规聚合物多孔膜难以实现的具有高透水性和耐化学腐蚀性的洗涤剂等,可长期使用; 及其制造方法等。 即,本发明提供一种多孔膜,其中PVDF树脂的结晶度为50%以上且90%以下,PVDF树脂的结晶度与比表面积的乘积 膜为300(%.m2 / g)以上但不大于2000(%.m2 / g)。 另外,本发明提供一种多孔膜的制造方法,其特征在于,具有:通过从成型喷嘴挤出至少含有疏水性聚合物成分的成膜溶液,制造具有PVDF树脂作为主要成分的多孔膜 具有PVDF树脂作为其主要成分的亲水聚合物组分和用于疏水和亲水性聚合物组分的常用溶剂,并且在以水为主要成分的溶液中固化所述成膜溶液,其中聚乙二醇具有 使用重均分子量为20,000以上且15万以下的亲水性高分子成分。