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    Controlling Melt Fracture in Bimodal Resin Pipe
    14.
    发明申请
    Controlling Melt Fracture in Bimodal Resin Pipe 有权
    控制双峰树脂管中的熔体断裂

    公开(公告)号：US20130323450A1

    公开(公告)日：2013-12-05

    申请号：US13660777

    申请日：2012-10-25

    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

    Inventor： Paul J. DesLauriers ,  Yongwoo Inn ,  Qing Yang ,  Ashish M. Sukhadia ,  David C. Rohlfing ,  Pamela L. Maeger

    IPC: C08F110/02

    CPC classification number: C08F110/02 ,  C08L23/04 ,  C08L23/06 ,  F16L9/00 ,  F16L9/12 ,  G01N3/24 ,  G01N11/04 ,  G06F17/10 ,  G06F19/703 ,  Y10T428/139

    Abstract: A method of preparing a medium-density polyethylene pipe comprising melting a multimodal metallocene-catalyzed polyethylene resin to form a molten polyethylene, wherein the multimodal metallocene-catalyzed polyethylene resin has a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi, a stress for smooth to matte transition of greater than about 90 kPa of stress, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test; and forming the molten polyethylene resin into pipe. A pipe prepared from a multimodal metallocene-catalyzed polyethylene resin having a density of from about 0.925 g/ml to about 0.942 g/ml, a magnitude of slip-stick greater than about 300 psi; a stress for smooth to matte transition of greater than about 90 kPa, and a shear rate for smooth to matte transition greater than about 10 s−1, wherein the magnitude of slip-stick, stress for smooth to matte transition, and shear rate for smooth to matte transition are determined by a capillary rheology test.

    Abstract translation: 一种制备中密度聚乙烯管的方法，包括熔化多峰茂金属催化的聚乙烯树脂以形成熔融聚乙烯，其中多峰茂金属催化的聚乙烯树脂的密度为约0.925g / ml至约0.942g / ml， 大于约300psi的滑棒的大小，大于约90kPa应力的平滑无光泽转变的应力和大于约10s -1的平滑到无光泽转变的剪切速率，其中滑移的大小 通过毛细管流变学测试确定平滑无光泽过渡的应力和平滑到无光泽过渡的剪切速率; 并将熔融的聚乙烯树脂形成管。 由密度为约0.925g / ml至约0.942g / ml的多峰金属茂催化的聚乙烯树脂制备的管，滑棒的大小大于约300psi; 大于约90kPa的平滑无光泽转变的应力，以及大于约10s -1的平滑到无光泽转变的剪切速率，其中滑棒的大小，光滑到无光泽的转变的应力和剪切速率 通过毛细管流变学测试确定光滑的无光泽转变。

    Controlling Melt Fracture in Bimodal Resin Pipe
    15.
    发明申请
    Controlling Melt Fracture in Bimodal Resin Pipe 审中-公开
    控制双峰树脂管中的熔体断裂

    公开(公告)号：US20130319131A1

    公开(公告)日：2013-12-05

    申请号：US13660747

    申请日：2012-10-25

    Applicant: CHEVRON PHILLIPS CHEMICAL COMPANY LP

    Inventor： Yongwoo Inn ,  Paul J. Deslauriers ,  Qing Yang ,  Ashish M. Sukhadia ,  David C. Rohlfing

    IPC: G01N3/24 ,  G06F17/10

    CPC classification number: C08F110/02 ,  C08L23/04 ,  C08L23/06 ,  F16L9/00 ,  F16L9/12 ,  G01N3/24 ,  G01N11/04 ,  G06F17/10 ,  G16C20/20 ,  Y10T428/139

    Abstract: A method of improving processing of polyethylene resins comprising obtaining a plurality of multimodal metallocene-catalyzed polyethylene samples measuring the shear stress as a function of shear rate for the plurality of multimodal metallocene-catalyzed polyethylene samples using capillary rheometry wherein the measuring yields values for a magnitude of slip-stick, a stress for smooth to matte transition, and a shear rate for smooth to matte transition; and identifying from the plurality of multimodal metallocene-catalyzed polyethylene samples individual multimodal metallocene-catalyzed polyethylene resins having a reduced tendency to melt fracture characterized by a magnitude of slip-stick greater than about 300 psi, a stress for smooth to matte transition greater than about 90 kPa, and a shear rate for smooth to matte transition greater than about 10 s−1.

    Abstract translation: 一种改进聚乙烯树脂加工的方法，其包括使用毛细管流变测定法测量剪切应力作为多种多峰茂金属催化聚乙烯样品的剪切速率的函数的多个多峰金属茂催化的聚乙烯样品，其中测量产生大小的值 的滑棒，平滑无光泽过渡的应力和平滑无光泽过渡的剪切速率; 并且从多个多峰茂金属催化的聚乙烯样品中鉴定具有降低的熔融断裂倾向的单个多峰茂金属催化的聚乙烯树脂，其特征在于大于约300psi的滑棒大小，平滑至无光泽转变的应力大于约 90kPa，以及平滑到无光泽转变的剪切速率大于约10s -1。

    Dual catalyst system for producing high density polyethylenes with long chain branching
    16.
    发明授权
    Dual catalyst system for producing high density polyethylenes with long chain branching 有权

    公开(公告)号：US11851505B2

    公开(公告)日：2023-12-26

    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

    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.

    Dual Catalyst System for Producing High Density Polyethylenes With Long Chain Branching
    20.
    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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