| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a crystallizable polymer microporous membrane, as well as a method for manufacturing the same, having a minute pore diameter, capable of efficiently catching fine particles of tens of nm size, and having a high flux, and a filteration filter. <P>SOLUTION: The crystallizable polymer microporous membrane has a laminate that consists of five or more layers formed by stacking a layer containing a first crystallizable polymer and a layer containing a second crystallizable polymer and formed with two or more holes penetrating in a thickness direction, wherein the melting point of the first crystallizable polymer is higher than the melting point of the second crystallizable polymer, while the layer that at least contains the second crystallizable polymer in the laminate has a fine structure which at least contains a fibril whose average major axis length is 1 μm or less, and at least one layer in the laminate has two or more holes whose average pore diameter is constant without any change at least at a part of the laminate in the thickness direction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
