Polyethylene films for barrier applications
    1.
    发明授权
    Polyethylene films for barrier applications 失效
    用于屏障应用的聚乙烯膜

    公开(公告)号:US06984698B2

    公开(公告)日:2006-01-10

    申请号:US10685853

    申请日:2003-10-15

    IPC分类号: C08F8/00

    摘要: Disclosed is a method of modifying polyethylene to increase its ability to resist the transmission of water vapor. The polyethylene is modified to increase long chain branching resulting in lower water vapor transmission rates in films prepared with the modified polyethylene. The polyethylene can be modified using peroxides, air and even by admixture with high long chain branching content polyethylene. The polyethylene, particularly when in the form of films, can be used for preparing packaging where sorption of flavor, aroma, or colorant compounds must be minimized.

    摘要翻译: 公开了一种改性聚乙烯以提高其抵抗水蒸气透过的能力的方法。 聚乙烯被改性以增加长链支化,导致用改性聚乙烯制备的膜中的较低的水蒸气透过率。 聚乙烯可以使用过氧化物,空气以及甚至通过与高长支链含量聚乙烯的混合来改性。 聚乙烯,特别是当以薄膜形式时,可以用于制备包装,其中香料,芳香剂或着色剂化合物的吸附必须最小化。

    Process for producing polyolefin
    4.
    发明授权
    Process for producing polyolefin 有权
    生产聚烯烃的方法

    公开(公告)号:US07094856B1

    公开(公告)日:2006-08-22

    申请号:US11189179

    申请日:2005-07-25

    IPC分类号: C08L23/16

    摘要: Process for the production of an oriented polyolefin film using multi-component polymer compositions. One polymer component comprises an isotactic propylene homopolymer produced by the polymerization of propylene with a Ziegler-Natta catalyst. A secondary component is a Ziegler-Natta polymerized ethylene-propylene random copolymer or a metallocene-polymerized ethylene-propylene random copolymer produced by the polymerization of propylene and ethylene in the presence of a metallocene polymerization catalyst. The Ziegler-Natta polymerized copolymer is produced by the polymerization of ethylene and propylene in the presence of a Ziegler-Natta catalyst and contains no more than 0.5 wt. % ethylene and has a xylene solubles content of at least 2 wt. %. The primary and secondary polymer components are mixed together to provide a blend in which, when the secondary component is a Ziegler-Natta polypropylene, is present in an amount within the range of 5–25 wt. % and the secondary polymer component is a metallocene-based copolymer present in an amount of less than 5 wt. %. After mixing the two polymer components together, the mixture is extruded and the formed into a biaxially oriented film.

    摘要翻译: 使用多组分聚合物组合物制备定向聚烯烃膜的方法。 一种聚合物组分包括通过丙烯与齐格勒 - 纳塔催化剂聚合制备的全同立构丙烯均聚物。 次级组分是齐格勒 - 纳塔聚合的乙烯 - 丙烯无规共聚物或通过丙烯和乙烯在金属茂聚合催化剂存在下聚合制备的茂金属聚合的乙烯 - 丙烯无规共聚物。 齐格勒 - 纳塔聚合的共聚物是在齐格勒 - 纳塔催化剂存在下通过乙烯和丙烯的聚合制备的,并且含有不超过0.5wt。 %乙烯,二甲苯可溶物含量至少为2重量%。 %。 将初级和次级聚合物组分混合在一起以提供共混物,其中当第二组分是齐格勒 - 纳塔聚丙烯时,其存在量为5-25wt。 %,并且次级聚合物组分是以小于5重量%的量存在的茂金属基共聚物。 %。 将两种聚合物组分混合在一起后,将混合物挤出并形成双轴取向薄膜。