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7 条记录 (耗时 0.017 秒)

    PROCESS FOR PREPARING A CAP OR CLOSURE
    4.
    发明申请
    PROCESS FOR PREPARING A CAP OR CLOSURE 有权

    公开(公告)号：US20220227030A1

    公开(公告)日：2022-07-21

    申请号：US17607059

    申请日：2020-04-28

    申请人： BOREALIS AG

    发明人： Jingbo WANG ,  Markus GAHLEITNER ,  Elisabeth POTTER ,  Luc MONNISSEN ,  Meta CIGON ,  Daniela MILEVA

    IPC分类号： B29C45/00 ,  C08F110/06 ,  B29C45/72

    摘要： A process for producing a cap or closure comprising obtaining a polypropylene composition by sequential polymerization comprising the steps: A) polymerizing in a first reactor, preferably a slurry reactor, in the presence of a Ziegler-Natta catalyst monomers comprising propylene and optionally one or more comonomers selected from ethylene and C4-C10 alpha-olefins, to obtain a first propylene polymer fraction having a comonomer content in the range of 0.0 to 1.8 wt %, and a MFR2 in the range of from 12.0 to 40.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg; B) polymerizing in a second reactor, preferably a first gas-phase reactor, monomers comprising propylene and one or more comonomers selected from ethylene and C4-C10 alpha-olefins, in the presence of the first propylene polymer fraction, to obtain a second propylene polymer fraction, wherein the polypropylene composition comprising said first and second propylene polymer fractions has an MFR2 in the range of from 12.0 to 60.0 g/10 min, as measured according to ISO 1133 at 230° C. under a load of 2.16 kg, has a comonomer content in the range of from 2.2 to 5.0 wt % and wherein the ratio of the comonomer content of component A) to the comonomer content of the polypropylene composition is 0.35 or less, C) melting, extruding and moulding the polypropylene composition in the presence of at least one nucleating agent to prepare a cap or closure; and D) exposing the cap or closure obtained in step (C) to a cooling rate of 50 K/s or more.

    HETEROPHASIC POLYPROPYLENE COMPOSITION
    6.
    发明申请
    HETEROPHASIC POLYPROPYLENE COMPOSITION 有权

    公开(公告)号：US20220306851A1

    公开(公告)日：2022-09-29

    申请号：US17610765

    申请日：2020-05-14

    申请人： BOREALIS AG

    发明人： Jingbo WANG ,  Elisabeth POTTER ,  Luc MONNISSEN ,  Meta CIGON

    IPC分类号： C08L23/16 ,  C08L23/08

    摘要： A heterophasic polypropylene composition comprises a matrix based on a propylene-random copolymer and a linear low density polyethylene dispersed in the matrix. The heterophasic polypropylene composition has both improved impact strength and reduced amount of fraction soluble in cold xylene (XCS), while maintaining optical properties. Further, the heterophasic polypropylene composition has an optimised ratio of impact strength to the amount of fraction soluble in cold xylene (XCS).p.