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    Metallocene catalysts for polyethylene
    1.
    发明授权
    Metallocene catalysts for polyethylene 有权

    公开(公告)号：US11325995B2

    公开(公告)日：2022-05-10

    申请号：US16797875

    申请日：2020-02-21

    申请人： CHEVRON PHILLIPS CHEMICAL COMPANY LP

    发明人： Errun Ding ,  Qing Yang ,  Carlton E. Ash ,  Randall S. Muninger ,  Jim B. Askew ,  Zhou Chen

    IPC分类号： C07F17/00 ,  C08F4/6592 ,  C08F210/16 ,  C08F10/02

    摘要： Disclosed are metallocene compounds, catalyst compositions comprising a metallocene compound, processes for polymerizing olefins, methods for making catalyst compositions, olefin polymers and articles made from olefin polymers. In an aspect, a metallocene compounds contain a fluorenyl ligand and a cyclopentadienyl ligand which are bridged by a linking group, in which the metallocene is characterized by [1] the cyclopentadienyl ligand being substituted with a C2-C18 heterohydrocarbyl group having an oxygen atom positioned 5 atoms distance or less from the cyclopentadienyl ligand and [2] the linking group having a pendant C3-C12 alkenyl group having a terminal C═C double bond. It has been discovered that a catalyst composition comprising a metallocene compound having these features can produce polyethylene having a low melt index in the absence of a second metallocene.

    METALLOCENE CATALYSTS FOR POLYETHYLENE
    2.
    发明申请
    METALLOCENE CATALYSTS FOR POLYETHYLENE 有权

    公开(公告)号：US20210261697A1

    公开(公告)日：2021-08-26

    申请号：US16797875

    申请日：2020-02-21

    申请人： CHEVRON PHILLIPS CHEMICAL COMPANY LP

    发明人： Errun Ding ,  Qing Yang ,  Carlton E. Ash ,  Randall S. Muninger ,  Jim B. Askew ,  Zhou Chen

    IPC分类号： C08F4/6592 ,  C08F10/02

    摘要： Disclosed are metallocene compounds, catalyst compositions comprising a metallocene compound, processes for polymerizing olefins, methods for making catalyst compositions, olefin polymers and articles made from olefin polymers. In an aspect, a metallocene compounds contain a fluorenyl ligand and a cyclopentadienyl ligand which are bridged by a linking group, in which the metallocene is characterized by [1] the cyclopentadienyl ligand being substituted with a C2-C18 heterohydrocarbyl group having an oxygen atom positioned 5 atoms distance or less from the cyclopentadienyl ligand and [2] the linking group having a pendant C3-C12 alkenyl group having a terminal C═C double bond. It has been discovered that a catalyst composition comprising a metallocene compound having these features can produce polyethylene having a low melt index in the absence of a second metallocene.