Patent ID: 6169151
Filing Date: 2001-01-02
Classification: C08F,Y10S

Abstract:
A method of producing an olefin copolymer from a feedstock including ethylene and at least one alpha olefin monomer comprising the steps of: a) contacting said feedstock with an unbridged, rotating, non-rigid fluxional metallocene catalyst component in the presence of a co-catalyst for a time sufficient to produce an elastomeric thermoplastic copolymer; b) said unbridged fluxional metallocene catalyst component is selected from at least one compound of the formula: ##STR5## in which M is a Group 3, 4 or 5 Transition metal, a Lanthanide or an Actinide; X and X' are the same or different uninegative ligands; and L and L' are ligands selected from the group consisting of same or different substituted, polynuclear, hydrocarbyl, and hetero-hydrocarbyl rings; c) said L and L' ligands are selected so that the fluxional metallocene component isomerizes between at least two coordinate geometry states that have different reactivities toward at least one of ethylene and said alpha olefin while in the respective coordinate geometry states; and d) recovering an elastomeric copolymer product.