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    Multimodal polyethylene composition, mixed catalyst and process for preparing the composition
    8.
    发明申请
    Multimodal polyethylene composition, mixed catalyst and process for preparing the composition 有权
    多峰聚乙烯组合物，混合催化剂及其制备方法

    公开(公告)号：US20090306299A1

    公开(公告)日：2009-12-10

    申请号：US12448449

    申请日：2007-12-18

    申请人： Jennifer Kipke ,  Shahram Mihan ,  Rainer Karer ,  Harald Schmitz

    发明人： Jennifer Kipke ,  Shahram Mihan ,  Rainer Karer ,  Harald Schmitz

    IPC分类号： C08L23/06 ,  C08F2/00 ,  B01J31/12

    CPC分类号： B01J31/12 ,  C08F2/34 ,  C08F4/65912 ,  C08F10/00 ,  C08F10/02 ,  C08F210/16 ,  C08F2410/04 ,  C08J5/18 ,  C08J2323/04 ,  C08L23/04 ,  C08L23/06 ,  C08L23/0815 ,  C08L2205/03 ,  C08L2314/06 ,  Y02P20/52 ,  C08F4/65925 ,  C08F4/65916 ,  C08L23/00 ,  C08L2666/06 ,  C08F210/14 ,  C08F2500/07 ,  C08F2500/08 ,  C08F2500/04 ,  C08F2500/26 ,  C08F4/7042 ,  C08F4/61904

    摘要： A multimodal polyethylene composition, in particular suitable for the preparation of films, but also textile articles, blow molded articles and injection molded articles is described. The polyethylene composition of the invention comprises at least three ethylene polymer fractions having distinct molecular weights or comonomer contents, said at least three ethylene polymer fractions comprising at least one first ethylene polymer fraction having a first molecular weight, a first comonomer content lower than a predetermined value and a first density; at least one second ethylene polymer fraction having a second molecular weight higher than said first molecular weight, a second comonomer content higher than said first comonomer content, and a second density; and at least one third ethylene polymer fraction having a third molecular weight higher than said first molecular weight, a third comonomer content lower than a predetermined value, and a third density; wherein said at least one first ethylene polymer fraction and said at least third ethylene polymer fraction are prepared by the use of a first and, respectively, third catalyst and said at least one second ethylene polymer fraction is prepared by the use of a second catalyst of the single site type. The films prepared from the composition of the invention have improved water vapor barrier properties. Furthermore, a mixed catalyst system comprising at least three catalyst components and a process particularly suitable to prepare the composition of the invention are described.

    摘要翻译： 描述了特别适用于制备薄膜的多峰聚乙烯组合物，但也描述了纺织品，吹塑制品和注塑制品。 本发明的聚乙烯组合物包含至少三种具有不同分子量或共聚单体含量的乙烯聚合物级分，所述至少三种乙烯聚合物级分包含至少一种具有第一分子量的第一乙烯聚合物级分，第一共聚单体含量低于预定的 价值和第一密度; 至少一个具有高于所述第一分子量的第二分子量的第二乙烯聚合物级分，高于所述第一共聚单体含量的第二共聚单体含量和第二密度; 和至少一种具有高于所述第一分子量的第三分子量的第三乙烯聚合物级分，低于预定值的第三共聚单体含量和第三密度; 其中所述至少一种第一乙烯聚合物部分和所述至少三乙烯聚合物部分是通过使用第一和第三催化剂制备的，所述至少一种第二乙烯聚合物部分是通过使用第二催化剂 单一站点类型。 由本发明的组合物制备的膜具有改善的水蒸气阻隔性能。 此外，描述了包含至少三种催化剂组分和特别适于制备本发明组合物的方法的混合催化剂体系。