| 摘要 |
HOMOGENEOUS OLEFIN POLYMERIZATION CATALYST BY ION WITH LEWIS ACIDS Addition polymerization catalysts having a limiting charge separated structure corresponding to the formula: LMX+ XA-, wherein: L is a derivative of a substituted delocalized n-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- 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, are prepared by contacting a derivative of a Group 4 or Lanthanide metal corresponding to the formula: LMX2, wherein L, M, and X are as previously defined, with the Lewis acid, A. 39,819A-F
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