Homogeneous olefin polymerization catalyst by abstraction with lewis
acids
    7.
    发明授权
    Homogeneous olefin polymerization catalyst by abstraction with lewis acids 失效
    均相烯烃聚合催化剂与路易斯酸的萃取

    公开(公告)号:US5721185A

    公开(公告)日:1998-02-24

    申请号:US876268

    申请日:1992-05-05

    摘要: A process for preparing addition polymerization catalysts having a limiting charge separated structure corresponding to the formula: LMX.sup.+ XA.sup.-, wherein: L is a derivative of a substituted delocalized .pi.-bonded group imparting a constrained geometry to the metal active site and containing up to 50 nonhydrogen atoms; M is a metal of Group 4 or the Lanthanide series of the Periodic Table of the Elements; X independently each occurrence is hydride or a hydrocarbyl, silyl or germyl group having up to 20 carbon, silicon or germanium atoms; and A.sup.- is an anion of a Lewis acid, A, having relative Lewis acidity greater than or equal to that of phenylbis(perfluorophenyl)borane, said anion being compatible with the metal cation, the steps of the process comprising contacting a derivative of a Group 4 or Lanthanide metal corresponding to the formula: i LMX.sub.2, wherein L, M, and X are as previously defined, with the Lewis acid, A, under conditions to cause abstraction of X and formation of the anion XA.sup.-.

    摘要翻译: 一种制备具有对应于下列通式的极限电荷分离结构的加成聚合催化剂的方法:LMX + XA-,其中:L是取代的离域π键合基团的衍生物,其赋予金属活性位点约束几何形状, 50个非氢原子; M是第4族金属或元素周期表的镧系元素; 独立地,每次出现氢化物或具有至多20个碳,硅或锗原子的烃基,甲硅烷基或甲硅烷基; A是具有大于或等于苯基双(全氟苯基)硼烷的相对路易斯酸度的路易斯酸A的阴离子,所述阴离子与金属阳离子相容,所述方法的步骤包括使 在引起X的抽出和形成阴离子XA-的条件下,与路易斯酸A相对应的式4或镧系金属,其中L,M和X如前所定义。