| 摘要 |
This invention relates to a catalyst system for the production of polyolefins comprising: (A) a Group IV B transition metal component represented by one of the two general formulae wherein (C<SUB>5</SUB>H<SUB>5-y-x</SUB>R<SUB>x</SUB>) is a cylopentadienyl ring (JR'<SUB>z-l-y</SUB>) is a heteroatom ligand in which J is an element with a coordination number of three from Group V-A or an element with a coordination number of two rom Group VI-A of the Periodic Table of Elements, each Q is independently, hydride, C<SUB>1</SUB>-C<SUB>20 </SUB>hydrocarbyl radicals, substituted hydrocarbyl radials wherein one or more hydrogen atoms is replaced by an electron withdrawing group, or C<SUB>1</SUB>-C<SUB>20 </SUB>hydrocarbyl-substituted metalloid radicals wherein the metalloid is selected from the group consisting of germanium and silicon, provided that Q is not a substituted or unsubstituted cyclopentadienyl ring, or both Q together may be an alkylidene, olefin, acetylene or a cyclometallated hydrocarbyl; "y" is 0 or 1; when "y" is 1, T is a covalent bridging group containing a Group IV-A or V-A element; L is a neutral Lewis base; and "w" is a number from 0 to 3; (B) an activator compound comprising (1) a cation; and (2) a compatible noncoordinating anion.
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