Patent ID: 7541412

Claim:
A method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst with a substoichiometric amount of a co-catalyst; adding a first olefin monomer; and polymerizing by degenerative transfer polymerization said first monomer for a time sufficient to form said polyolefin, wherein said metallocene pre-catalyst has the formula: wherein the dotted lines indicate a delocalized bond; M is V, Nb or Ta; each R 1 is independently hydrogen or alkyl or two adjacent R 1 form an aromatic ring; each R 2 , R 3 and R 4 is independently alkyl, cycloalkyl, Si(alkyl) 3 , Si(aryl) 3 , phenyl, optionally substituted phenyl, or alkylphenyl; and each R 5 is halo, alkyl, cycloalkyl, aryl or arylalkyl.