Unsaturated hydrocarbons polymerization catalysts containing transition metal complexes and Bronsted acids

摘要

Catalysts compositions and methods for polymerizing conjugated diolefins comprisingPP(a) A complex of a transition metal of Groups IV through VIII of Mendeleev's Periodic Table as a nuclear atom and unsaturated hydrocarbon having at least one pair of &pgr; electrons as ligand, andPP(b) A Bronsted acid.PP Preferred embodiments include a catalyst resulting from a pre-treatment of (a) with a conjugated diolefin and the polymerization process incorporating the pretreated catalyst.