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    • 9. 发明申请
    • MULTIMODAL POLYETHYLENE COMPOSITION, MIXED CATALYST AND PROCESS FOR PREPARING THE COMPOSITION
    • 多型聚乙烯组合物,混合催化剂和制备组合物的方法
    • WO2008077530A2
    • 2008-07-03
    • PCT/EP2007011113
    • 2007-12-18
    • BASELL POLYOLEFINE GMBHKIPKE JENNIFERMIHAN SHAHRAMKARER RAINERSCHMITZ HARALD
    • KIPKE JENNIFERMIHAN SHAHRAMKARER RAINERSCHMITZ HARALD
    • C08L23/04C08F297/08
    • B01J31/12C08F2/34C08F4/65912C08F10/00C08F10/02C08F210/16C08F2410/04C08J5/18C08J2323/04C08L23/04C08L23/06C08L23/0815C08L2205/03C08L2314/06Y02P20/52C08F4/65925C08F4/65916C08L23/00C08L2666/06C08F210/14C08F2500/07C08F2500/08C08F2500/04C08F2500/26C08F4/7042C08F4/61904
    • 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.
    • 描述了一种多峰聚乙烯组合物,特别适用于制备薄膜,但也包括纺织品,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部分,所述至少三种乙烯聚合物部分包含至少一种具有第一分子量的第一乙烯聚合物部分,第一共聚单体含量低于预定的 价值和第一密度; 至少一种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部分,第二共聚单体含量高于所述第一共聚单体含量和第二密度; 和至少一种具有比所述第一分子量高的第三分子量,低​​于预定值的第三共聚单体含量和第三密度的第三乙烯聚合物部分; 其中所述至少一种第一乙烯聚合物部分和所述至少第三乙烯聚合物部分通过使用第一催化剂和第三催化剂制备,并且所述至少一种第二乙烯聚合物部分通过使用第二催化剂 单一网站类型。 由本发明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的混合催化剂体系和特别适用于制备本发明组合物的方法。