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    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching
    2.
    发明公开
    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching 审中-公开

    公开(公告)号：US20240076424A1

    公开(公告)日：2024-03-07

    申请号：US18496994

    申请日：2023-10-30

    Applicant: Chevron Phillips Chemical Company LP

    Inventor： Errun Ding ,  Qing Yang ,  Randall S. Muninger ,  Youlu Yu ,  Yongwoo Inn

    IPC: C08F10/02 ,  C08F2/34 ,  C08F4/6592

    CPC classification number: C08F10/02 ,  C08F2/34 ,  C08F4/65922 ,  C08F2500/01 ,  C08F2500/04 ,  C08F2500/12 ,  C08F2500/17

    Abstract: Disclosed herein are ethylene-based polymers generally characterized by a melt index of less than 1 g/10 min, a density from 0.93 to 0.965 g/cm3, a CY-a parameter at 190° C. of less than 0.2, an average number of short chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g/mol that is greater than that in a molecular weight range of 40,000 to 60,000 g/mol, and an average number of long chain branches per 1000 total carbon atoms of the polymer in a molecular weight range of 400,000 to 600,000 g/mol that is greater than that in a molecular weight range of 4,000,000 to 6,000,000 g/mol. The ethylene polymers can be used to fabricate pipes, blown films, and blow molded products, and the ethylene polymers can be produced with a dual catalyst system containing a single atom bridged or two carbon atom bridged metallocene compound with two indenyl groups or an indenyl group and a cyclopentadienyl group, and a single atom bridged metallocene compound with a fluorenyl group and a cyclopentadienyl group with an alkenyl substituent.

    Metallocene catalysts for polyethylene
    3.
    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

    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

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

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

    Abstract: 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.

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