Method for preparing microporous polyolefin shaped articles
    10.
    发明授权
    Method for preparing microporous polyolefin shaped articles 失效
    微孔聚烯烃成型制品的制备方法

    公开(公告)号:US5238623A

    公开(公告)日:1993-08-24

    申请号:US840291

    申请日:1992-02-24

    Abstract: A method for preparing a microporous polyolefin shaped article which includes the steps of (1) melt blending a polyolefin with an additive which is miscible with the polymer at the melt temperature of the blend but which phase separates on cooling to form a solution; (2) forming a shaped article from the solution; (3) cooling the shaped article by use of a patterned chill roll to provide areas on the surface of the article where the polymer mixture does not contact the chill roll; and (4) (a) removing at least a substantial portion of the compatible liquid; or (b) stretching the article in at least one direction sufficient to permanently attenuate the article and effect orientation of the polymer; or (c) a combination of (a) and (b) to form a microporous polyolefin shaped article. The article is of substantially uniform thickness and has a patterned surface. The patterned surface provides substantially skinless areas having high microporosity and skinned areas or reduced porosity.

    Abstract translation: 一种制备微孔聚烯烃成型制品的方法,其包括以下步骤:(1)将聚烯烃与在所述共混物的熔融温度下与所述聚合物混溶的添加剂熔融共混,但是所述相在冷却时分离形成溶液; (2)从溶液中形成成型制品; (3)通过使用图案化的冷却辊来冷却成形制品,以在制品的表面上提供聚合物混合物不接触冷却辊的区域; 和(4)(a)除去至少大部分的相容液体; 或(b)在足以使制品永久衰减并且影响聚合物取向的至少一个方向上拉伸制品; 或(c)(a)和(b)的组合以形成微孔聚烯烃成型制品。 该制品具有基本均匀的厚度并且具有图案化表面。 图案化的表面提供具有高微孔性和表皮区域或降低的孔隙率的基本上无皮肤区域。

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