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    Process for producing LLDPE resins
    3.
    发明授权
    Process for producing LLDPE resins 有权

    公开(公告)号：US10584196B2

    公开(公告)日：2020-03-10

    申请号：US15739649

    申请日：2016-06-23

    申请人： BOREALIS AG

    发明人： Alexandra Romina Albunia ,  Ravindra Tupe ,  Victor Sumerin ,  John Jamieson ,  Jani Aho ,  Markku Vahteri ,  Jarmo Kela ,  Renate Eckmayr

    IPC分类号： C08F210/16 ,  C08F110/02 ,  C08F2/00 ,  C08F2/14 ,  C08F2/34 ,  C08F4/02 ,  C08L23/08 ,  C08L23/06

    摘要： A process for producing copolymers of ethylene and at least one alpha-olefin having from 4 to 10 carbon atoms in the presence of a solid Ziegler-Natta catalyst comprising of magnesium, titanium, halogen and an internal organic compound, the copolymer having a density of from 906 to 937 kg/m3 and a melt flow rate MFR21 measured at 190° C. under 21.6 kg load of from 3 to 150 g/10 min. The process includes the steps of (A) homopolymerising ethylene or copolymerising ethylene and a first alpha-olefin having from 4 to 10 carbon atoms in a first polymerisation stage in the presence of the polymerisation catalyst, hydrogen and optionally the first alpha-olefin; (B) copolymerising ethylene and a second alpha-olefin having from 4 to 10 carbon atoms in a second polymerisation stage in the presence of the first homo- or copolymer of ethylene and the Ziegler-Natta catalyst; and (C) recovering the polymer mixture.

    Process for producing multimodal polyethylene in-situ blends including ultra-high molecular weight fractions
    4.
    发明授权
    Process for producing multimodal polyethylene in-situ blends including ultra-high molecular weight fractions 审中-公开

    公开(公告)号：US10669410B2

    公开(公告)日：2020-06-02

    申请号：US15539130

    申请日：2015-12-21

    申请人： BOREALIS AG

    发明人： Yi Liu ,  Qizheng Dou ,  Alexandra Romina Albunia

    IPC分类号： C08L23/08 ,  C08L23/06 ,  C08F10/02 ,  B29B9/12 ,  C08F2/00 ,  B29B9/06

    摘要： The present application relates to a process for producing a multimodal polyethylene composition comprising the steps of polymerizing a polyethylene fraction (A-1) having a weight average molecular weight Mw of equal to or more than 500 kg/mol to equal to or less than 10,000 kg/mol and a density of equal to or more than 915 kg/m3 to equal to or less than 960 kg/m3 in one reaction step and polymerizing a polyethylene fraction (A-2) having a lower weight average molecular weight Mw as polyethylene fraction (A-1) and a density of equal to or more than 910 kg/m3 to equal to or less than 975 kg/m3 in a second reaction step of a sequential multistage process wherein one of said polyethylene fractions is polymerized in the presence of the other of said polyethylene fractions to form a first polyethylene resin (A) having a weight average molecular weight Mw of equal to or more than 150 kg/mol to equal to or less than 1,500 kg/mol, and a density of equal to or more than 910 kg/m3 to equal to or less than 975 kg/m3, wherein the weight average molecular weight Mw of the first polyethylene resin (A) is lower than the weight average molecular weight Mw of the polyethylene fraction (A-1), blending the first polyethylene resin (A) with a second polyethylene resin (B) having a weight average molecular weight Mw of equal to or more than 50 kg/mol to less than 500 kg/mol, and a density of equal to or more than 910 kg/m3 to equal to or less than 970 kg/m3 to form said multimodal polyethylene composition, wherein the multimodal polyethylene composition a melt flow rate MFR5 (190° C., 5 kg) of 0.01 to 10 g/10 min and a density of equal to or more than 910 kg/m3 to equal to or less than 970 kg/m3 a polyethylene composition obtainable by said process and the polyethylene resin of said first polymerization step.

    POLYETHYLENE COMPOSITION FOR HIGH PRESSURE RESISTANT PIPES
    8.
    发明申请
    POLYETHYLENE COMPOSITION FOR HIGH PRESSURE RESISTANT PIPES 有权

    公开(公告)号：US20220010046A1

    公开(公告)日：2022-01-13

    申请号：US17288804

    申请日：2019-10-23

    申请人： BOREALIS AG

    发明人： Yi Liu ,  Qizheng Dou ,  Victor Sumerin ,  Markku Vahteri ,  Thomas Hjertberg ,  Girish Suresh Gali ,  Alexandra Romina Albunia

    IPC分类号： C08F210/16 ,  C08F2/00 ,  C08L23/08

    摘要： The present invention relates to a polyethylene composition comprising a base resin having a density of from 950.0 kg/m3 to 962.0 kg/m3, determined according to ISO 1183, wherein the polyethylene composition has a melt flow rate MFR21 (190° C., 21.16 kg), of from 1.0 to 9.0 g/10 min, determined according to ISO 1133 and a viscosity at a constant shear stress of 747 Pa eta747 of from 3500 kPa #s to 20000 kPa #s, a polyethylene composition obtainable by a multi-stage process, a process for producing said polyethylene composition, an article, such as a pipe or pipe fitting, comprising said polyethylene composition and the use of said polyethylene composition for the production of an article, such as a pipe or pipe fitting.