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    Process for the preparation of copolymers of propylene
    32.
    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.

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