Patent ID: 6670297
Filing Date: 2003-12-30
Classification: C08F,C08L,Y10S,Y10T

Abstract:
A catalyst composition for the polymerization of one or more olefins comprising a transition metal atom, a bidentate diimine ligand and two monodentate ligands, said bidentate ligand and monodentate ligands being coordinate to the transition metal atom in square planar configuration, wherein the bidentate ligand has sufficient steric bulk on both sides of the coordination plane to permit formation of a polymer of said one or more olefins with a degree of polymerization of at least about 10 or more, provided that said transition metal atom is selected from the group consisting of Fe, Co, Ni and Pd and said monodentate ligands comprise at least one of a group Q and group Sâ€², in an amount equal to the oxidation state of the transition metal, wherein Q and Sâ€² are independently an alkyl, hydride, chloride, iodide, or bromide, said catalyst composition further comprising a compound Wâ€², wherein Wâ€² is a neutral Lewis acid capable of abstracting either Qâˆ’ or Sâ€²âˆ’to form Wâ€²Qâˆ’ or Wâ€²Sâ€²âˆ’, provided that the anion formed is a weakly coordinating anion; or Wâ€² is a cationic Lewis or Bronsted acid whose counterion is a weakly coordinating anion.