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    Olefin copolymerization process with bridged hafnocenes
    12.
    发明授权
    Olefin copolymerization process with bridged hafnocenes 有权
    烯烃共聚方法与桥连氢键

    公开(公告)号：US06300433B1

    公开(公告)日：2001-10-09

    申请号：US09422533

    申请日：1999-10-21

    申请人： George Rodriguez ,  Donna J. Crowther

    发明人： George Rodriguez ,  Donna J. Crowther

    IPC分类号： C08F452

    CPC分类号： C08F10/00 ,  C07F17/00 ,  C08F4/65908 ,  C08F10/02 ,  C08F110/02 ,  C08F210/16 ,  C08F4/65927 ,  C08F210/14 ,  C08F2/06 ,  C08F2500/03 ,  C08F2500/04 ,  C08F2500/12 ,  C08F2500/08

    摘要： The invention is directed to olefin polymerization processes using bridged hafnocene catalyst complexes that are surprisingly stable under high temperature olefin polymerization processes such that olefin copolymers can be prepared with high molecular weights and catalyst activities. More specifically, the invention is a polymerization process for ethylene copolymers having a melt index of about 0.850 to about 0.930 comprising contacting, under homogeneous polymerization conditions at a reaction temperature at or above 60° C. to 250° C., ethylene and one or more comonomers capable of insertion polymerization with a bridged hafnocene catalyst complex derived from A) a biscyclopentadienyl hafnium organometallic compound having i) at least one unsubstituted cyclopentadienyl ligand or aromatic fused-ring substituted cyclopentadienyl ligand, ii) one aromatic fused-ring substituted cyclopentadienyl ligand, iii) and a covalent bridge connecting the two cyclopentadienyl ligands, said bridge comprising a single carbon or silicon atom with two aryl groups, each substituted with a C1-C20 hydrocarbyl or hydrocarbylsilyl group at least one of which is a linear C3 or greater substitutent; and B) an activating cocatalyst.

    摘要翻译： 本发明涉及使用在高温烯烃聚合方法中出人意料地稳定的桥联茂茂催化剂络合物的烯烃聚合方法，使得可以以高分子量和催化剂活性制备烯烃共聚物。 更具体地，本发明是一种熔体指数为约0.850至约0.930的乙烯共聚物的聚合方法，其包括在均相聚合条件下在等于或高于60℃至250℃的反应温度下接触乙烯和一种或 能够与来自A）双环戊二烯基铪有机金属化合物的桥连的茂金属催化剂络合物进行插入聚合的更多共聚单体，其具有i）至少一个未取代的环戊二烯基配体或芳族稠环取代的环戊二烯基配体，ii）一个芳族稠环取代的环戊二烯基配体， iii）和连接两个环戊二烯基配体的共价桥，所述桥包含单个碳或硅原子与两个芳基，每个被C1-C20烃基或烃基甲硅烷基取代，其中至少一个是直链C3或更大的取代基; 和B）活化助催化剂。