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    METALLOCENE CATALYSTS FOR POLYETHYLENE
    31.
    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

    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

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

    IPC: C08F4/6592 ,  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.

    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching
    32.
    发明申请
    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching 有权

    公开(公告)号：US20210139619A1

    公开(公告)日：2021-05-13

    申请号：US17142312

    申请日：2021-01-06

    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

    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.

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