PROCESS FOR PRODUCTION OF POROUS MEMBRANE
    33.
    发明申请
    PROCESS FOR PRODUCTION OF POROUS MEMBRANE 有权
    生产多孔膜的方法

    公开(公告)号:US20130049246A1

    公开(公告)日:2013-02-28

    申请号:US13261454

    申请日:2011-04-05

    Abstract: 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.

    Abstract translation: 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))的成膜原液分层成单层或 两层或多层; 将成膜原液浸渍在相对于聚合物(A)为非溶剂的凝固液中,相对于聚乙烯吡咯烷酮(B)为良好的溶剂; 除去聚乙烯吡咯烷酮(B),其中聚乙烯吡咯烷酮(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,通过使用能够容易地除去的适量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。

    Process for producing porous polymer materials
    36.
    发明申请
    Process for producing porous polymer materials 有权
    生产多孔聚合物材料的方法

    公开(公告)号:US20030116877A1

    公开(公告)日:2003-06-26

    申请号:US10241440

    申请日:2002-09-12

    Abstract: A process for producing porous polymer material. The method combines a polymer and water-soluble granules to form a mixture. The mixture is placed into a mold; the surface of the polymer is dissolved to cause cohesion and form a polymer structure having water-soluble granules dispersed within, and water is introduced into the inner part of the polymer structure so that the polymer is solidified and water-soluble granules are washed out to obtain a porous polymer material. According to the invention, single or multiple layers of porous polymer material with different apertures, porosities, or made with different materials, are obtained by combining different polymer materials and water-soluble granules having different particle sizes in different weight ratios.

    Abstract translation: 一种多孔聚合物材料的制造方法。 该方法结合聚合物和水溶性颗粒以形成混合物。 将混合物放入模具中; 溶解聚合物的表面以引起内聚,并形成分散在其中的水溶性颗粒的聚合物结构,并且将水引入聚合物结构的内部,使得聚合物固化并将水溶性颗粒冲洗至 获得多孔聚合物材料。 根据本发明,通过将不同聚合物材料和具有不同重量比的不同粒度的水溶性颗粒结合,获得具有不同孔径,孔隙率或不同材料制成的单层或多层多孔聚合物材料。

    PROCESS FOR PRODUCING POROUS POLYIMIDE AND POROUS POLYIMIDE
    37.
    发明申请
    PROCESS FOR PRODUCING POROUS POLYIMIDE AND POROUS POLYIMIDE 有权
    生产多孔聚酰胺和多孔聚酰胺的方法

    公开(公告)号:US20020058720A1

    公开(公告)日:2002-05-16

    申请号:US09984416

    申请日:2001-10-30

    Abstract: A porous polyimide having a finely cellular structure and having a low dielectric constant and heat resistance. The porous polyimide can be produced by a process comprising adding a dispersible compound to a polyimide precursor to form a micro-domain structure in which the dispersible compound is dispersed in the polymer so as to have a size smaller than 10 nullm and then removing the dispersible compound by extraction with supercritical carbon dioxide to thereby make the precursor porous, wherein the interaction parameter nullAB between the polyimide precursor A and the dispersible compound B is larger than 3. This porous polyimide has an average cell diameter smaller than 5 nullm and a dielectric constant of 3 or lower.

    Abstract translation: 具有微细结构并具有低介电常数和耐热性的多孔聚酰亚胺。 多孔聚酰亚胺可以通过包括向聚酰亚胺前体中加入可分散化合物以形成其中可分散化合物分散在聚合物中以使其尺寸小于10μm的微畴结构,然后除去可分散的 通过用超临界二氧化碳萃取,从而使前体多孔化,其中聚酰亚胺前体A和可分散化合物B之间的相互作用参数和AB均大于3.该多孔聚酰亚胺的平均泡孔直径小于5μm, 介电常数为3以下。

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