公开(公告)号：US4919810A

公开(公告)日：1990-04-24

申请号：US54894

申请日：1987-05-28

申请人： Hajime Itoh ,  Hiroshi Takahashi ,  Kouji Ohbori ,  Hideaki Habara

发明人： Hajime Itoh ,  Hiroshi Takahashi ,  Kouji Ohbori ,  Hideaki Habara

IPC分类号： B01D53/22 ,  B01D67/00 ,  B01D69/02 ,  B01D69/06 ,  B01D71/28 ,  B01D71/40 ,  B01D71/42 ,  B01D71/52 ,  C08J9/00 ,  C08J9/36

CPC分类号： B01D69/06 ,  B01D67/0016 ,  B01D69/02 ,  B01D2323/02 ,  B01D2323/12 ,  B01D2323/30 ,  B01D2325/022 ,  Y10T428/269 ,  Y10T428/2935 ,  Y10T428/2975 ,  Y10T428/31928 ,  Y10T428/31931 ,  Y10T428/31935

摘要： Disclosed is a porous membrane consisting of a film-forming polymer characterized in that:(a) in at least one surface thereof, pores extending in a direction substantially perpendicular to the membrane surface are present at a surface pore density of 20 to 80%, said pores having an average pore diameter within the range of 0.01 to 100 .mu.m, a ratio of major to minor axis within the range of 1.0 to 2.0, and a coefficient of variation of pore diameter within the range of 0 to 50%; and(b) the overall porosity of said porous membrane is within the range of 20 to 90%.

摘要翻译： 公开了一种由成膜聚合物组成的多孔膜，其特征在于：（a）在其至少一个表面中，以基本上垂直于膜表面的方向延伸的孔以20至80％的表面孔密度存在， 所述孔的平均孔径在0.01〜100μm的范围内，主轴与短轴的比在1.0〜2.0的范围内，孔径的变异系数在0〜50％的范围内。 和（b）所述多孔膜的总孔隙率在20〜90％的范围内。

公开(公告)号：US4869857A

公开(公告)日：1989-09-26

申请号：US55049

申请日：1987-05-28

申请人： Hajime Itoh ,  Hiroshi Takahashi ,  Kouji Ohbori ,  Hideaki Habara

发明人： Hajime Itoh ,  Hiroshi Takahashi ,  Kouji Ohbori ,  Hideaki Habara

IPC分类号： B01D67/00 ,  B01D69/06 ,  C08J9/28

CPC分类号： C08J9/28 ,  B01D67/0013 ,  B01D67/0016 ,  B01D69/02 ,  B01D69/06 ,  B01D2323/12 ,  B01D2325/022 ,  C08J2201/0502 ,  C08J2201/0544 ,  Y10S264/13

摘要： Porous membranes are produced by dissolving a film-forming polymer in a good solvent for the polymer, forming a film of the resulting polymer solution, and forcibly contacting saturated steam or mist-containing steam with at least one surface of said film. Such porous membranes have pores having a narrow pore diameter distribution and extending in a direction substantially perpendicular to the membrane surface at a high surface pore density on at least one surface thereof.