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    Process for Producing Multimodal Polyethylene in-situ Blends Including Ultra-High Molecular Weight Fractions
    3.
    发明申请
    Process for Producing Multimodal Polyethylene in-situ Blends Including Ultra-High Molecular Weight Fractions 审中-公开

    公开(公告)号：US20170362417A1

    公开(公告)日：2017-12-21

    申请号：US15539130

    申请日：2015-12-21

    Applicant: BOREALIS AG

    Inventor： Yi LIU ,  Qizheng DOU ,  Alexandra Romina ALBUNIA

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

    Abstract: 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.

    PROCESS
    5.
    发明公开
    PROCESS 审中-公开

    公开(公告)号：US20230416428A1

    公开(公告)日：2023-12-28

    申请号：US18039082

    申请日：2021-11-26

    Applicant: BOREALIS AG

    Inventor： Tuan Anh TRAN ,  Alexandra Romina ALBUNIA ,  Qizheng DOU ,  Victor SUMERIN ,  Markku VAHTERI ,  Jarmo KELA

    IPC: C08F210/16 ,  C08J5/18

    CPC classification number: C08F210/16 ,  C08J5/18 ,  C08J2323/08 ,  C08J2423/08

    Abstract: The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a density of greater than 950 kg/m, a Mz of at least 1000 kDa and a melt flow rate (MFR5) of 0.01 to 4.0 g/10 min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE; wherein the split for the third polymerisation stage is at least 50%.

    PROCESS FOR THE PREPARATION OF MULTIMODAL HIGH DENSITY POLYETHYLENE
    6.
    发明申请
    PROCESS FOR THE PREPARATION OF MULTIMODAL HIGH DENSITY POLYETHYLENE 有权

    公开(公告)号：US20210147660A1

    公开(公告)日：2021-05-20

    申请号：US17056855

    申请日：2019-05-30

    Applicant: BOREALIS AG

    Inventor： Anh Tuan TRAN ,  Alexandra Romina ALBUNIA ,  Joy Jie CHENG ,  Joseph THORMAN ,  John JAMIESON ,  Ravindra TUPE

    IPC: C08L23/06 ,  C08F210/02 ,  C08F210/08 ,  C08F2/00 ,  C08F2/34 ,  B29C45/00 ,  B29C43/00

    Abstract: The invention provides a process for the preparation of a multimodal high density polyethylene (HDPE) having a melt flow rate (MFR2) of 0.1 to 4.0 g/10 min, said process comprising: (i) polymerising ethylene in a first polymerisation stage in the presence of a Ziegler-Natta catalyst to prepare a first ethylene homopolymer having a MFR2 from 10 to 500 g/10 min; (ii) polymerising ethylene in a second polymerisation stage in the presence of said catalyst and said first ethylene homopolymer to prepare an ethylene homopolymer mixture comprising said first ethylene homopolymer and a second ethylene homopolymer, said mixture having a MFR2 from 50 to 1000 g/10 min; and (iii) polymerising ethylene and at least one alpha-olefin comonomer in a third polymerisation stage in the presence of said catalyst and said ethylene homopolymer mixture to prepare said multimodal HDPE.

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