| abstract |
cis-1,4-polydien preparation catalysts a polymerization catalyst composition for preparing such 1,4-polydien is provided. the catalyst composition comprises said metal being one (a) a metal containing compound, the transition metal or a lanthanide metal; (b) a carbene, (c) an alkylating agent, and optionally (d) a halogen containing compound provided that the halogen containing compound must be present when none of the metal containing compound and the alkylating agent contains an atom of unstable halogen. Also provided is a process for producing a polydiene comprising reacting a conjugated diene in the presence of the polymerization catalyst composition. |