Process for producing a porous film
    3.
    发明授权
    Process for producing a porous film 失效
    多孔膜的制造方法

    公开(公告)号:US4921652A

    公开(公告)日:1990-05-01

    申请号:US229797

    申请日:1988-08-08

    摘要: A process for producing a porous film having practically sufficient mechanical strengths, good flexibility, uniform fine pores and high moisture vapor permeability, and further an extremely thin porous film, which process comprises blending 30 to 80 parts by weight of an inorganic fine powder having a specific surface area of 15 m.sup.2 /g or less and an average particle size of 0.4 to 4 .mu.m with 20 to 70 parts by weight of a polyolefin resin, followed by melt-molding the resulting blend into a film and then stretching the film to 2 to 7 times the original length at least in the uniaxial direction.

    摘要翻译: 一种具有实际上足够的机械强度,良好的柔韧性,均匀的细孔和高透湿度的多孔膜的制造方法,以及进一步的极薄的多孔膜,该方法包括混合30〜80重量份的无机细粉末, 比表面积为15m 2 / g以下,平均粒径为0.4〜4μm,聚烯烃树脂为20〜70重量份,然后将所得共混物熔融成型,然后将膜拉伸至 至少在单轴方向上为原始长度的2至7倍。