Process for the production of a biaxially highly oriented polypropylene
film
    5.
    发明授权
    Process for the production of a biaxially highly oriented polypropylene film 失效
    制备双轴取向聚丙烯薄膜的方法

    公开(公告)号:US5766532A

    公开(公告)日:1998-06-16

    申请号:US439598

    申请日:1995-05-12

    IPC分类号: B29C55/00 C08F8/00 B29C55/12

    摘要: A process for the production of a biaxially oriented propylene polymer film contains, in its single ply (or, if it is a multi-ply film, in its base ply) a low molecular weight resin, and the film has improved stretchability and other desirable physical properties, even though the propylene polymer of the sole or base ply is preferably a homopolymer. The n-heptane-insoluble fraction of the film has a chain isotacticity index, measured by means of .sup.13 C-NMR spectroscopy, of at least 85 to 94%. The sole or base ply contains less than 10% by weight of resin. The film is stretched in such a way that the product of tensile strength in the longitudinal and transverse direction is greater than 50,000 (N/mm.sup.2).sup.2. The film is made by, among other steps, carrying out the orientation in the longitudinal and transverse directions such that the product of the longitudinal stretching ratio and the transverse stretching ratio is.gtoreq.60.

    摘要翻译: 制造双轴取向丙烯聚合物膜的方法在其单层(或者如果是其多层膜中在基底层中)含有低分子量树脂,并且该膜具有改善的拉伸性和其它所需的 物理性质,即使鞋底或底层的丙烯聚合物优选为均聚物。 所述膜的正庚烷不溶级分具有至少85至94%的通过13 C-NMR光谱法测量的链全同立构指数。 底层或底层含有少于10重量%的树脂。 该膜以拉伸强度在纵向和横向上的乘积大于50,000(N / mm 2)2的方式拉伸。 除了其他步骤之外,通过纵向和横向方向进行取向,使得纵向拉伸比和横向拉伸倍数的乘积为> 60°而制成薄膜。

    Low-sealing, biaxially oriented polyolefin multilayer film, process for
its production and its use
    6.
    发明授权
    Low-sealing, biaxially oriented polyolefin multilayer film, process for its production and its use 失效
    低密度双轴取向聚烯烃多层膜,其生产工艺及其应用

    公开(公告)号:US5817412A

    公开(公告)日:1998-10-06

    申请号:US755489

    申请日:1996-11-22

    IPC分类号: B32B27/32

    摘要: A polyolefinic multilayer film comprises at least three layers BIT, wherein B is a polyolefinic base layer, I is an intermediate layer, and T is a top layer applied to the intermediate layer I. The intermediate layer I comprises at least 75% by weight, based on the weight of the intermediate layer I, of heat sealable polyolefins. The top layer T comprises at least 75% by weight, based on the weight of the top layer T, of heat sealable polyolefins. The minimum sealing temperature of the polyolefin of top layer T is at least 100.degree. C. and is greater than the minimum sealing temperature of the polyolefin of the intermediate layer I. The thickness of the top layer T is less than 0.4 .mu.m.

    摘要翻译: 聚烯烃多层膜包括至少三层BIT,其中B是聚烯烃基层,I是中间层,T是施加到中间层I的顶层。中间层I包含至少75重量% 基于中间层I的重量,可热封聚烯烃。 顶层T包含至少75重量%,基于顶层T的重量,可热封聚烯烃。 顶层T的聚烯烃的最小密封温度为至少100℃,大于中间层I的聚烯烃的最小密封温度。顶层T的厚度小于0.4μm。