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    High-Density Polyethylene Compositions, Method of Making the Same, Articles Made Therefrom, and Method of Making Such Articles
    1.
    发明申请
    High-Density Polyethylene Compositions, Method of Making the Same, Articles Made Therefrom, and Method of Making Such Articles 有权

    公开(公告)号：US20080221273A1

    公开(公告)日：2008-09-11

    申请号：US12067832

    申请日：2007-05-02

    申请人： William J. Michie Jr. ,  Thomas W. Kay ,  Stephanie M. Whited ,  Dale M. Elley-Bristow ,  David T. Gillespie ,  Lonnie G. Hazlitt

    发明人： William J. Michie Jr. ,  Thomas W. Kay ,  Stephanie M. Whited ,  Dale M. Elley-Bristow ,  David T. Gillespie ,  Lonnie G. Hazlitt

    IPC分类号： C08L23/04 ,  C08F2/00 ,  B29C43/00 ,  B29C45/00

    CPC分类号： C08L23/08 ,  C08L23/04 ,  C08L23/06 ,  C08L23/0815 ,  C08L2203/10 ,  Y10T428/24992 ,  Y10T428/273 ,  C08L2666/06

    摘要： The instant invention is a high-density polyethylene compositions, and method of making the same. The high-density polyethylene composition of the instant invention includes a first component, and a second component. The first component is a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.915 to 0.940 g/cm3, and a melt index (I21) in the range of 0.5 to 10 g/10 minutes. The second component is a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g/cm3, and a melt index (I2) in the range of 50 to 1500 g/10 minutes. The high-density polyethylene composition has a melt index (I2) of at least 1, a density in the range of 0.950 to 0.960 g/cm3, and g′ of equal or greater than 1. The method of producing a high-density polyethylene composition include the following steps: (1) introducing ethylene, and an alpha-olefin comonomer into a first reactor; (2) copolymerizing the ethylene with the alpha-olefin comonomer in the first reactor thereby producing a first component, wherein the first component being a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.915 to 0.940 g/cm3, and a melt index (I21) in the range of 0.5 to 10 g/10 minutes; (3) introducing the first component and additional ethylene into a second reactor; (4) polymerizing the additional ethylene in the second reactor thereby producing a second component, wherein the second component being a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g/cm3, and a melt index (I2) in the range of 50 to 1500 g/10 minutes; and (5) thereby producing the high-density polyethylene composition, wherein the high-density polyethylene composition having a melt index (I2) of at least 1, a density in the range of 0.950 to 0.960 g/cm3, and g′ of equal or greater than 1.