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    • 10. 发明授权
    • Porous membrane and method for preparing the same
    • 多孔膜及其制备方法
    • US5202025A
    • 1993-04-13
    • US821844
    • 1992-01-14
    • Makoto OnishiKenichi Shimura
    • Makoto OnishiKenichi Shimura
    • B01D67/00
    • B01D67/0093B01D67/0027B01D2323/38B01D2325/32B01D2325/36
    • In the method for preparing a porous membrane, a polymer having a low glass transition temperature is held on the surface of a porous membrane substrate and then drawing is conducted. Accordingly, the drawing at a high draw ratio can be conducted to which the substrate as such can not be subjected. As a result, not only an excellent porous membrane having an enlarged pore size and an increased void volume can be obtained but also it is possible to control the pore size and the void volume in wide ranges. Further, a hydrophilic polymer having a glass transition temperature of not more than 300 K is formed on the surface of pores of a porous membrane substrate by graft polymerization so as to bond the hydrophilic polymer on the substrate by a covalent bond. Therefore, it is possible to provide a porous membrane excellent in unbrittleness and inhibiting elution in an environmental liquid or the like.
    • 在制备多孔膜的方法中,将具有低玻璃化转变温度的聚合物保持在多孔膜基材的表面上,然后进行拉伸。 因此,可以进行基板不能经受的高拉伸比的拉伸。 结果,不仅可以获得具有扩大的孔径和增加的空隙体积的优异的多孔膜,而且可以在宽范围内控制孔径和空隙体积。 此外,通过接枝聚合在多孔膜基材的孔的表面上形成玻璃化转变温度不超过300K的亲水性聚合物,以通过共价键将亲水性聚合物键合在基材上。 因此,可以提供在环境液体等中不易脆性和抑制洗脱优异的多孔膜。