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    ETHYLENE COPOLYMER FOR BIAXIAL ORIENTATION
    5.
    发明公开
    ETHYLENE COPOLYMER FOR BIAXIAL ORIENTATION 审中-公开

    公开(公告)号：EP4269481A3

    公开(公告)日：2024-01-03

    申请号：EP23189835.4

    申请日：2021-06-23

    Applicant: Nova Chemicals (International) S.A.

    Inventor： FEREYDOON, Maryam ,  GOYAL, Shivendra ,  BROWN, Stephen ,  LIGHTBODY, Owen ,  AUBEE, Norman ,  GILLON, Bronwyn ,  GREEN, Thomas ,  MARK, Lison ,  CARELLO, Christian

    IPC: B29C55/14 ,  B29D7/01 ,  B29C55/00 ,  B29K23/00

    Abstract: A solution phase polymerization process to make an ethylene copolymer in a multi-zone reactor system is described. The multi-zone-reactor system comprises a first, second and third polymerization zone, wherein the first polymerization zone is defined by a first tubular reactor having an inlet and an outlet. The polymerization process comprises feeding solvent, hydrogen, a Ziegler-Natta polymerization catalyst, ethylene, and at least one alpha olefin having 4 to 8 carbon atoms, to the inlet of the first tubular reactor to initiate a polymerization reaction; feeding hydrogen to at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; wherein at least 80 weight percent of the total amount of hydrogen added to the multi-zone reactor system, is added to the at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; and wherein from 20 to 50 weight percent of the total amount of ethylene copolymer made in the multi-zone reactor system is made in the first tubular reactor. An ethylene copolymer made by the process is useful in the preparation of biaxially oriented polyethylene (BOPE) films.

    MDO MULTILAYER FILM
    8.
    发明公开
    MDO MULTILAYER FILM 审中-公开
    MDO多层膜

    公开(公告)号：EP3233473A1

    公开(公告)日：2017-10-25

    申请号：EP15821168.0

    申请日：2015-12-10

    Applicant: Nova Chemicals (International) S.A.

    Inventor： BORSE, Nitin ,  AUBEE, Norman

    IPC: B32B7/02 ,  B32B27/08 ,  B32B27/18 ,  B32B27/32

    CPC classification number: B29C47/065 ,  B29C47/0004 ,  B29C47/0021 ,  B29C47/0057 ,  B29C55/005 ,  B29C55/06 ,  B29K2023/065 ,  B29K2105/0005 ,  B29K2995/0063 ,  B29L2007/008 ,  B29L2009/00 ,  B29L2031/712 ,  B32B7/02 ,  B32B27/08 ,  B32B27/18 ,  B32B27/32 ,  B32B2270/00 ,  B32B2307/516 ,  B32B2307/72 ,  B32B2439/00

    Abstract: A multilayer film having Machine Direction Orientation (MDO) is prepared by first co-extruding a multilayer film, then stretching the multilayer film in the machine direction at a temperature lower than the melting point of the polyethylene resin that is used to prepare the film. At least one layer of the film is a first polyethylene composition having a density of from about 0.94 to about 0.97 g/cc and at least one second layer is prepared from a polyethylene composition having a lower density than the first polyethylene composition. This disclosure enables the manufacture of films having outstanding barrier properties (low Water Vapor Transmission Rate, WVTR, and low Oxygen Transmission Rate, OTR) and good physical properties.

    Abstract translation: 通过首先共挤出多层膜，然后在低于用于制备膜的聚乙烯树脂的熔点的温度下沿机器方向拉伸多层膜，制备具有机器方向取向（MDO）的多层膜。 至少一层薄膜是密度为约0.94至约0.97g / cc的第一聚乙烯组合物，至少一个第二层由密度低于第一聚乙烯组合物的聚乙烯组合物制备。 本公开使得能够制造具有优异阻隔性能（低水蒸气透过率，WVTR和低氧透过率，OTR）和良好物理性质的膜。

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