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    HETEROPHASIC POLYPROPYLENE COMPOSITION WITH IMPROVED BALANCE OF PROPERTIES
    11.
    发明申请
    HETEROPHASIC POLYPROPYLENE COMPOSITION WITH IMPROVED BALANCE OF PROPERTIES 有权

    公开(公告)号：US20210253836A1

    公开(公告)日：2021-08-19

    申请号：US16973673

    申请日：2019-07-10

    Applicant: BOREALIS AG

    Inventor： Markus GAHLEITNER ,  Jingbo WANG ,  Klaus BERNREITNER ,  Simon SCHWARZENBERGER ,  Luigi RESCONI

    IPC: C08L23/12

    Abstract: The present invention is directed to a heterophasic polypropylene composition having an improved balance of desirable properties, i.e. high stiffness, high toughness, and high transparency. The heterophasic polypropylene composition of the present invention comprises 60.0 to 95.0 wt % of a crystalline propylene homopolymer with a melting temperature Tm1 measured by differential scanning calorimetry of higher than 155° C., 5.0 to 20.0 wt % of an elastomeric ethylene-propylene rubber, and at least one polymeric nucleating agent, wherein the crystalline propylene homopolymer (H-PP) and the elastomeric ethylene-propylene rubber (EPR) have been produced in the presence of a single-site catalyst, wherein the heterophasic polypropylene composition is characterized by a soluble fraction determined in 1,2,4-trichlorobenzene at 40° C. in the range of 5.0 to 20.0 wt %, and wherein the soluble fraction has an ethylene in content in the range of 12.0 to 40.0 wt %. The present invention is further directed to a process for the preparation of the heterophasic polypropylene composition comprising polymerizing propylene in at least three polymerization steps in the presence of a single-site catalyst, wherein the at least one polymeric nucleating agent is introduced either as a master batch by a compounding step or via a prepolymerization step prior to the first polymerization step. The present invention is further directed to an article obtained by extrusion of the heterophasic polypropylene composition, and to a packaging article comprising the extruded article. Finally, the present invention is directed to the use of the heterophasic polypropylene composition for the production of extruded articles such as films or sheets.

    LONG-CHAIN BRANCHED PROPYLENE POLYMER COMPOSITION
    13.
    发明公开
    LONG-CHAIN BRANCHED PROPYLENE POLYMER COMPOSITION 审中-公开

    公开(公告)号：US20240043584A1

    公开(公告)日：2024-02-08

    申请号：US18485443

    申请日：2023-10-12

    Applicant: BOREALIS AG

    Inventor： Jingbo WANG ,  Markus GAHLEITNER ,  Klaus BERNREITNER ,  Katja Ellen KLIMKE ,  Friedrich BERGER

    IPC: C08F110/06

    CPC classification number: C08F110/06 ,  C08F2810/10

    Abstract: Disclosed is a process for producing a propylene polymer composition comprising a long chain branched propylene polymer, wherein the propylene polymer composition has
    a) a melt flow rate MFR2 (230° C., 2.16 kg) of 0.8 to 6.0 g/10 min
    b) a xylene hot insolubles (XHU) fraction in an amount of not more than 0.80 wt %, based on the total weight amount of the propylene polymer composition,
    c) a melting temperature Tm of at least 160.0° C.,
    d) a F30 melt strength of from 5.0 to less than 30.0 cN, and
    e) a heat distortion temperature (HDT) of at least 108° C.,
    the process comprising reactive modification of a propylene polymer in the presence of a peroxide. Also disclosed is an article comprising said propylene polymer composition.

    PROCESS FOR RECYCLING PROPYLENE-ETHYLENE COPOLYMERS
    14.
    发明公开
    PROCESS FOR RECYCLING PROPYLENE-ETHYLENE COPOLYMERS 审中-公开

    公开(公告)号：US20240002559A1

    公开(公告)日：2024-01-04

    申请号：US18247342

    申请日：2021-09-27

    Applicant: Borealis AG

    Inventor： Jingbo WANG ,  Markus GAHLEITNER ,  Klaus BERNREITNER ,  Pauli LESKINEN ,  Johanna LILJA ,  Anita LUYTEN

    IPC: C08F210/06 ,  B29B17/00 ,  B29C48/00 ,  B29C48/04 ,  B29C48/36 ,  B29C48/92 ,  B29D22/00 ,  B29C45/00

    CPC classification number: C08F210/06 ,  B29B17/00 ,  B29C48/022 ,  B29C48/04 ,  B29K2105/26 ,  B29C48/92 ,  B29D22/003 ,  B29C45/0001 ,  B29C48/36

    Abstract: The present invention provides a process for recycling propylene-ethylene copolymers to obtain polymers having good optical and mechanical properties, as well as good processability. The invention further provides propylene-ethylene copolymer pellets obtained from the process, articles comprising or consisting of such pellets and the use of the propylene-ethylene copolymer pellets for injection molding applications. The process comprising the steps of (a) polymerizing propylene and ethylene in the presence of a single site catalyst in a continuous polymerization reactor under dynamic conditions, (b) collecting the resulting propylene-ethylene copolymer powders from step (a) to obtain a mixture (M) of propylene-ethylene copolymer powders having a MFR2 (ISO 1133, 230° C., 2.16 kg) in a raffle of from 1.5 to 80.0 g/ 10 min and an ethylene content in a range of from 1.0 to 4.0 wt. % based on the total weight of the mixture (M), (c) compounding said mixture (M) in an extruder in the presence of a radical initiator, and a clarifying agent in an amount of from 0.01 to 1.0 wt. %, based on the total weight of the mixture of propylene-ethylene copolymer powders, and (d) extruding the above mixture into pellets; wherein, in step a), the dynamic conditions are such that the ethylene content and the melt flow rate (MFR2) of the resulting copolymer gradually changes from a first predetermined ethylene content, E1, to a second predetermined ethylene content, E2, and from a first predetermined melt flow rate, MFR2-1, to a second predetermined melt flow rate, MFR2-2; wherein collecting the copolymer powders in step b) is started when the polymer produced in step a) has a first ethylene content, E1, and a melt flow rate MFR2-1, and collecting the copolymer powders in step b) is stopped when the polymer produced in step a) has a second ethylene content, E2, and a melt flow rate MFR2-2; and wherein said pellets obtained in step d) have (i) a MFR2 (ISO 1133, 230° C., 2.16 kg) in the range of from 20 to 120 g/10 in, (ii) a ratio of MFR2 pellets/MFR2 powder>1, (iii) an ethylene content in a range of from 1.0 to 4.0 wt %, (iv) a crystallization temperature Tc, determined by DSC according to ISO 11357-3:1999 in the range of from 100 to 125° C., and (v) a flexural modulus, determined in a 3-point-bending according to ISO 178 on injection molded specimens of 80×10×4 mm, prepared in accordance with EN ISO 1873-2, of 850 MPa or more.

    POLYMER COMPOSITION SUITABLE FOR MAKING BLOWN FILMS
    15.
    发明申请
    POLYMER COMPOSITION SUITABLE FOR MAKING BLOWN FILMS 有权

    公开(公告)号：US20220363880A1

    公开(公告)日：2022-11-17

    申请号：US17765907

    申请日：2020-09-30

    Applicant: BOREALIS AG

    Inventor： Jingbo WANG ,  Markus GAHLEITNER ,  Klaus BERNREITNER ,  Pauli LESKINEN

    IPC: C08L23/14 ,  C08J5/18

    Abstract: The present invention relates to a polymer composition comprising at least the following components: A) 70.0 to 95.0 wt.-% based on the overall weight of the polymer composition of a C2C3 random copolymer; whereby said C2C3 random copolymer has a melting point in the range of 110 to 140° C. determined by differential scanning calorimetry according to ISO 11357-3; a MFR2 (230° C., 2.16 kg) determined according to ISO 1133 in the range of 0.5 to 4.0 g/10 min; and a total C2-content in the range of 1 to 10 wt.-% based on the overall weight of the C2C3 random copolymer; B) 5.0 to 30.0 wt.-% based on the overall weight of the polymer composition of a LDPE; whereby said LDPE has a density determined according to ISO 1183 in the range of 915 to 922 kg/m3; and a MFR2 (190° C., 2.16 kg) determined according to ISO 1133 in the range of 0.9 to 20.0 g/10 min; with the proviso that the weight proportions of components A) and B) add up to 100 wt.-%. In addition, the present invention refers to the articles, preferably blown films made of said polymer composition

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