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    Process for the preparation of copolymers of propylene
    31.
    发明授权
    Process for the preparation of copolymers of propylene 有权

    公开(公告)号：US10081686B2

    公开(公告)日：2018-09-25

    申请号：US15510040

    申请日：2015-09-11

    Applicant: BOREALIS AG

    Inventor： Luigi Resconi ,  Wilfried Töltsch ,  Jingbo Wang

    IPC: C08F4/00 ,  C08F4/06 ,  C08F32/00 ,  C08F4/16 ,  C08F210/02 ,  C08F210/06 ,  B01J35/02

    CPC classification number: C08F4/16 ,  B01J35/026 ,  C08F2/38 ,  C08F210/02 ,  C08F210/06 ,  C08F2500/10 ,  C08F2500/17 ,  C08F4/65927 ,  C08F2500/12

    Abstract: A process for the preparation of a copolymer of propylene and ethylene comprising polymerizing propylene and ethylene in the gas phase in the presence of a solid particulate catalyst free from an external carrier comprising: (i) a symmetrical complex of formula (I), wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR′2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom, C1-C20-alkyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; R2 is a C1-C20 hydrocarbyl radical; m is 2 to 5; R9 is a H or C1-C20 hydrocarbyl radical; R7 is a hydrogen atom or a C1-10 hydrocarbyl radical; n is 0 to 3; R1 is a C1-C20 hydrocarbyl radical and optionally two adjacent R1 groups taken together can form a further mono or multicyclic ring condensed to Ph ring optionally substituted by one or two groups R4; and R4 is a C1-C10 alkyl radical; and (ii) a cocatalyst, preferably comprising an organometallic compound of a Group 13 metal; wherein the xylene soluble fraction of the propylene ethylene copolymer has an ethylene content of at least 10 wt % and an intrinsic viscosity of at least 1.2 dl/g.

    Process for reducing the VOC content of a polyolefin composition
    39.
    发明申请
    Process for reducing the VOC content of a polyolefin composition 有权

    公开(公告)号：US20250092167A1

    公开(公告)日：2025-03-20

    申请号：US18577242

    申请日：2022-07-13

    Applicant: Borealis AG

    Inventor： Jingbo Wang ,  Markus Gahleitner ,  Klaus Bernreitner ,  Pauli Leskinen ,  Elisabeth Potter

    IPC: C08F6/28

    Abstract: The present invention relates to a process for reducing the volatile organic compound (VOC, VDA 278 October 2011) content of a polyolefin composition, the polyolefin composition including a polypropylene homopolymer, a polypropylene copolymer, a polyethylene homopolymer, and/or a polyethylene copolymer, the process comprising the steps of a) subjecting the polyolefin composition having a VOC (VOC, VDA 278 October 2011) content, which is contained in an aeration vessel, to an aeration gas flow, and maintaining said aeration gas flow for an aeration time of 15 hours or less the aeration gas having a minimum temperature of at least 20° C. measured at an inlet of the aeration gas of the aeration vessel, and a maximum temperature of 99° C. measured at an inlet for aeration gas of the aeration vessel; the aeration vessel having—at least one inlet for aeration gas,—at least one outlet for aeration gas,—an inlet for the polyolefin composition having a VOC content,—an outlet for an aerated polyolefin composition at the bottom of the aeration vessel; wherein the polyolefin composition contains 20 to 55 pieces/g (pellet size 3-5 mm) as measured according to the specification; and wherein the polyolefin composition is present in the aeration vessel as a packed bed; and b) withdrawing the aerated polyolefin composition from the aeration vessel having a VOC content (VOC, VDA 278 October 2011) of not greater than 600 μg/g.

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