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    Stereospecific olefin polymerization catalysts
    2.
    发明授权
    Stereospecific olefin polymerization catalysts 失效
    立体特异性烯烃聚合催化剂

    公开(公告)号：US5708101A

    公开(公告)日：1998-01-13

    申请号：US696004

    申请日：1996-08-12

    申请人： John E. Bercaw ,  Timothy A. Herzog

    发明人： John E. Bercaw ,  Timothy A. Herzog

    IPC分类号： C07F17/00 ,  C08F4/619 ,  C08F4/6192 ,  C08F4/642 ,  C08F10/00

    CPC分类号： C07F17/00 ,  C08F10/00 ,  C08F4/61912 ,  C08F4/61927 ,  Y10S526/943

    摘要： A metallocene catalyst system for the polymerization of .alpha.-olefins to yield stereospecific polymers including syndiotactic, and isotactic polymers. The catalyst system includes a metal and a ligand of the formula ##STR1## wherein: R.sup.1, R.sup.2, and R.sup.3 are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.10 alkyl, 5 to 7 membered cycloalkyl, which in turn may have from 1 to 3 C.sub.1 to C.sub.10 alkyls as a substituent, C.sub.6 to C.sub.15 aryl or arylalkyl in which two adjacent radicals may together stand for cyclic groups having 4 to 15 carbon atoms which in turn may be substituted, or Si(R.sup.8).sub.3 where R.sup.8 is selected from the group consisting of C.sub.1 to C.sub.10 alkyl, C.sub.6 to C.sub.15 aryl or C.sub.3 to C.sub.10 cycloalkyl; R.sup.4 and R.sup.6 are substituents both having van der Waals radii larger than the van der Waals radii of groups R.sup.1 and R.sup.3 ; R.sup.5 is a substituent having a van der Waals radius less than about the van der Waals radius of a methyl group; E.sup.1, E.sup.2 are independently selected from the group consisting of Si(R.sup.9).sub.2, Si(R.sup.9).sub.2 --Si(R.sup.9).sub.2, Ge(R.sup.9).sub.2, Sn(R.sup.9).sub.2, C(R.sup.9).sub.2, C(R.sup.9).sub.2 --C(R.sup.9).sub.2, where R.sup.9 is C.sub.1 to C.sub.10 alkyl, C.sub.6 to C.sub.15 aryl or C.sub.3 to C.sub.10 cycloalkyl; and the ligand may have C.sub.S or C.sub.1 -symmetry. Preferred metals are selected from the group consisting of group III, group IV, group V or lanthanide group elements. The catalysts are used to prepare stereoregular polymers including polypropylene from .alpha.-olefin monomers.

    摘要翻译： 用于α-烯烃聚合的茂金属催化剂体系以产生立体特异性聚合物，包括间同立构聚合物和全同立构聚合物。 催化剂体系包括金属和下式的配体，其中：R 1，R 2和R 3独立地选自氢，C 1至C 10烷基，5至7元环烷基，其又可以具有 1至3个C1至C10烷基作为取代基，C6至C15芳基或芳烷基，其中两个相邻的基团可以一起代表具有4至15个碳原子的环状基团，其又可以被取代，或其中R8为 选自C1-C10烷基，C6-C15芳基或C3-C10环烷基; R4和R6是具有大于组R1和R3的范德华半径的范德华半径的取代基; R5是范德华半径小于甲基范德华半径的取代基; E1，E2独立地选自Si（R9）2，Si（R9）2-Si（R9）2，Ge（R9）2，Sn（R9）2，C（R9）2，C ）2 -C（R 9）2，其中R 9为C 1至C 10烷基，C 6至C 15芳基或C 3至C 10环烷基; 并且配体可以具有CS或C1对称性。 优选的金属选自III族，IV族，V族或镧系元素。 催化剂用于制备包括α-烯烃单体的聚丙烯的立构规整聚合物。