Patent ID: 7081504

Claim:
A process for producing cis-1,4-polybutadiene having a reduced molecular weight and improved processability which comprises polymerizing 1,3-butadiene in the presence of (a) an organonickel compound, (b) an organoaluminum compound, (c) a fluorine containing compound, and (d) an alkylated diphenylamine; wherein the alkylated diphenylamine has alkyl groups that contain from 2 to 18 carbon atoms, wherein the organoaluminum compound and the fluorine containing compound are brought together in the presence of the alkylated diphenylamine, wherein said 1,3-butadiene monomer is polymerized to produce the high cis-1,4-polybutadiene by solution polymerization in a polymerization medium which includes an organic solvent.