The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2002
Filed:
Jul. 08, 1999
Ilya E. Nifant'ev, Moscow, RU;
Vladimir V. Bagrov, Moscow, RU;
Basell Technology Company BV, Hoofddorp, NL;
Abstract
A class of metallocenes of formula (I): (ZR ) (Cp)(A) ML L′ (I) wherein (ZR ) , 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 and R are hydrogen, halogen or a hydrocarbon radical, optionally containing heteroatoms; R is 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.