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    Method for producing porous polytetrafluoroethylene film and porous polytetrafluoroethylene film
    3.
    发明授权
    Method for producing porous polytetrafluoroethylene film and porous polytetrafluoroethylene film 有权
    生产多孔聚四氟乙烯薄膜和多孔聚四氟乙烯薄膜的方法

    公开(公告)号：US09493619B2

    公开(公告)日：2016-11-15

    申请号：US14758625

    申请日：2014-06-23

    申请人： SUMITOMO ELECTRIC FINE POLYMER, INC.

    发明人： Fumihiro Hayashi ,  Hiroyuki Tsujiwaki ,  Aya Murata ,  Atsushi Uno

    IPC分类号： C08J5/18 ,  B01D67/00 ,  B01D71/36 ,  B29C55/00 ,  B01D69/06 ,  B29K27/18 ,  B29L7/00

    CPC分类号： C08J5/18 ,  B01D67/0027 ,  B01D69/06 ,  B01D71/36 ,  B01D2323/08 ,  B01D2325/24 ,  B01D2325/30 ,  B29C55/005 ,  B29C55/02 ,  B29C61/003 ,  B29C61/02 ,  B29K2027/18 ,  B29K2105/04 ,  B29L2007/008 ,  C08J2327/18

    摘要： Provided is a method for producing a porous polytetrafluoroethylene film having good chemical resistance, good heat resistance, a high porosity, and good dimensional stability. The method for producing a porous polytetrafluoroethylene film includes a stretching step of stretching a sheet-like molded body composed of a fluororesin containing polytetrafluoroethylene as a main component in a longitudinal direction and/or a lateral direction at a temperature lower than a melting point of the fluororesin to make a porous fluororesin film, and, after the stretching step, an annealing step of holding the porous fluororesin film in a shape-fixed state, and maintaining the porous fluororesin film at a temperature lower than the melting point of the fluororesin but not lower than a temperature 30° C. lower than the melting point for 1 to 20 hours.

    摘要翻译： 本发明提供一种耐化学性，耐热性，高孔隙率，尺寸稳定性好的多孔聚四氟乙烯膜的制造方法。 制造多孔聚四氟乙烯膜的方法包括拉伸步骤，该方法在低于所述聚四氟乙烯的熔点的温度下，在纵向和/或横向方向上拉伸由含有聚四氟乙烯的氟树脂作为主要成分的片状成型体 氟树脂以制造多孔氟树脂膜，并且在拉伸步骤之后，将多孔氟树脂膜保持在形状固定状态并将多孔氟树脂膜保持在低于氟树脂熔点的温度的退火步骤，而不是 低于温度30℃，低于熔点1〜20小时。

    FLUORORESIN MICROPOROUS MEMBRANE, METHOD FOR PRODUCING THE SAME, AND FILTER ELEMENT USING THE FLUORORESIN MICROPOROUS MEMBRANE
    4.
    发明申请
    FLUORORESIN MICROPOROUS MEMBRANE, METHOD FOR PRODUCING THE SAME, AND FILTER ELEMENT USING THE FLUORORESIN MICROPOROUS MEMBRANE 审中-公开
    氟菊酯微孔膜，其制备方法和使用氟代麦芽糖膜的过滤元件

    公开(公告)号：US20150079392A1

    公开(公告)日：2015-03-19

    申请号：US14391779

    申请日：2013-04-02

    申请人： Sumitomo Electric Fine Polymer, Inc.

    发明人： Fumihiro Hayashi ,  Aya Murata ,  Atsushi Uno

    IPC分类号： B01D71/32 ,  C08L27/18 ,  H01B3/44 ,  B01D71/36 ,  B01D67/00

    CPC分类号： B01D71/32 ,  B01D67/002 ,  B01D67/0027 ,  B01D69/02 ,  B01D71/36 ,  C08J9/24 ,  C08J2327/12 ,  C08L27/18 ,  H01B3/445 ,  Y10T428/2933

    摘要： Provided are a fluororesin microporous membrane having a narrow pore-size distribution and a smaller difference between a mean flow pore size and a maximum pore size, a method for producing the fluororesin microporous membrane, and a filter element that uses the fluororesin microporous membrane. The fluororesin microporous membrane is a porous membrane obtained by forming fluororesin particles into a membrane having a particular shape and particular dimensions, baking the fluororesin particles together by heating the membrane to a melting point of the membrane or higher, and then stretching the membrane. The fluororesin particles each have a structure in which a heat of fusion of a fluororesin constituting an outer surface portion of the particle is lower than a heat of fusion of polytetrafluoroethylene constituting an inside portion of the particle.

    摘要翻译： 提供了具有窄孔径分布窄，平均流动孔径和最大孔径之间的较小差异的氟树脂微孔膜，使用该氟树脂微多孔膜的氟树脂微多孔膜的制造方法和过滤元件。 氟树脂微多孔膜是通过将氟树脂颗粒形成为具有特定形状和特定尺寸的膜而获得的多孔膜，通过将膜加热至膜的熔点以上，然后拉伸膜将氟树脂颗粒一起烧制。 氟树脂颗粒各自具有构成颗粒的外表面部分的氟树脂的熔化热低于构成颗粒内部的聚四氟乙烯的熔化热的结构。