Metallocenes and catalysts for olefin-polymerisation
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United States of America Patent
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app pub date -
May 2, 2002
filing date -
Nov 12, 1997
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Abandoned
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Abstract
A class of metallocenes of formula (I): (ZR.sup.1.sub.m).sub.n(Cp)(A).sub.-rML.sub.pL'.sub.q (I) wherein ZR.sup.1.sub.m) is a divalent group bridging Cp and A, Cp is a heterocyclic cyclopentadienyl group of formula (II) or (II'), wherein one of X or Y is a single bond, the other being an heteroatom; R.sup.2 and R.sup.3 are hydrogen, halogen or a hydrocarbon radical, optionally containing heteroatoms; R.sup.4 is a halogen or an hydrocarbon radical, optionally containing heteroatoms; the group A is a cyclopentadienyl derivative or is equal to Cp; M is Ti, Zr or Hf; m is 1 or 2; n ranges from 0 to 4; r is 0 or 1; p and q range from 0 to 3; and a ranges from 0 to 4. Moreover, are disclosed catalyst systems containing these metallocenes, useful in the polymerization of olefins. 1
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