Oriented porous polypropylene films
    2.
    发明授权
    Oriented porous polypropylene films 失效
    定向多孔聚丙烯薄膜

    公开(公告)号:US4975469A

    公开(公告)日:1990-12-04

    申请号:US325680

    申请日:1989-03-20

    摘要: This invention relates to oriented porous films having cells with polygonal cross sections and average pore diameters of about 5 to about 30 microns and interconnecting pores between the cells which have a diameter of about 0.2 to about 20 microns which are formed from a polypropylene-based resin and a process for forming the film which comprises the steps of forming a film containing beta-spherulites, selectively extracting a portion of the beta-spherulites to form a porous film and stretching the porous film in at least one direction to form the oriented polymeric porous film.

    摘要翻译: 本发明涉及具有多边形横截面和平均孔径约5至约30微米的细胞的定向多孔膜,并且在直径为约0.2至约20微米的单元之间互连孔,其由聚丙烯基树脂 以及形成膜的方法,其包括以下步骤:形成含有β-球晶的膜,选择性地提取一部分β-球晶以形成多孔膜并且在至少一个方向上拉伸多孔膜以形成定向聚合物多孔 电影。