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    Ziegler-Natta catalysts for the production of polyethylene
    3.
    发明授权
    Ziegler-Natta catalysts for the production of polyethylene 有权

    公开(公告)号：US11542344B2

    公开(公告)日：2023-01-03

    申请号：US17057766

    申请日：2019-05-29

    申请人： Dow Global Technologies LLC

    发明人： Linfeng Chen ,  Kurt F. Hirsekorn ,  Mehmet Demirors ,  Teresa P. Karjala

    IPC分类号： C08F4/658 ,  C08F2/04 ,  C08F2/44 ,  C08F10/02

    摘要： The heterogeneous procatalyst of this disclosure includes a titanium species; a hydrocarbon soluble transition metal compound having a structure M(OR1)z; a chlorinating agent having a structure A(Cl)x(R2)3-x, and a magnesium chloride component. M of M(OR1)z is a non-reducing transition metal other than titanium, the non-reducing transition metal being in an oxidation state of +2 or +3. Each R1 is independently (C1-C30)hydrocarbyl or —C(O)R11, where R11 is (C1-C30)hydrocarbyl. Subscript z of M(OR1)z is 2 or 3. Each R1 and R11 may be optionally substituted with one or more than one halogen atoms, or one or more than one —Si(RS)3, where each RS is (C1-C30)hydrocarbyl. A of A(Cl)x(R2)3-x is aluminum or boron; R2 is (C1-C30)hydrocarbyl; and x is 1, 2, or 3; and a magnesium chloride component.

    Polyolefin composition and method of producing the same
    5.
    发明授权
    Polyolefin composition and method of producing the same 有权

    公开(公告)号：US09879105B2

    公开(公告)日：2018-01-30

    申请号：US15025366

    申请日：2014-10-30

    申请人： Dow Global Technologies LLC

    发明人： Linfeng Chen ,  Stephanie M. Whited ,  Robert J. Jorgensen

    IPC分类号： C08F210/16

    CPC分类号： C08F210/16 ,  C08F210/14 ,  C08F4/6494 ,  C08F4/6543

    摘要： The instant invention provides a polyolefin composition, a catalyst composition, and a method of producing the same. The method for polymerizing one or more polyolefins according to the present invention comprises the steps of: (1) selecting a first olefin monomer and optionally one or more alpha-olefin comonomers; (2) selecting one or more catalyst systems comprising one or more procatalysts comprising a first metal selected from the group consisting of Ti, V, Hf, Zr, and combinations or mixture two or more thereof, one or more cocatalysts comprising Al, and one or more self-limiting agents (SLA) selected from the group consisting of polyether, polyester, and combinations or mixtures thereof; wherein the ratio of said SLA to said first metal (SLA:first metal) is from 0.1:1 to 30:1; (3) polymerizing said first olefin monomer and optionally one or more alpha-olefin comonomers in the presence of said one or more catalyst systems via a slurry polymerization process or gas-phase polymerization process in one or more reactors; (4) thereby producing one or more olefin-based polymers; (5) wherein said catalyst system has a loss of least 85 percent of catalyst activity when the temperature is increased from 85 to 110° C.

    MODIFIED ZIEGLER-NATTA (PRO) CATALYSTS AND SYSTEM
    9.
    发明申请
    MODIFIED ZIEGLER-NATTA (PRO) CATALYSTS AND SYSTEM 有权

    公开(公告)号：US20210332170A1

    公开(公告)日：2021-10-28

    申请号：US17371728

    申请日：2021-07-09

    申请人： Dow Global Technologies LLC

    发明人： Linfeng Chen ,  Mehmet Demirors

    IPC分类号： C08F210/16 ,  C08F10/00

    摘要： A modified Ziegler-Natta procatalyst that is a product mixture of modifying an initial Ziegler-Natta procatalyst with a molecular (pro)catalyst, and optionally an activator, the modifying occurring before activating the modified Ziegler-Natta procatalyst with an activator and before contacting the modified Ziegler-Natta procatalyst with a polymerizable olefin. Also, a modified catalyst system prepared therefrom, methods of preparing the modified Ziegler-Natta procatalyst and the modified catalyst system, a method of polymerizing an olefin using the modified catalyst system, and a polyolefin product made thereby.