Patent ID: 6617406
Filing Date: 2003-09-09
Classification: C08F

Abstract:
A process for synthesizing elastomeric-trans-1,4-polybutadiene by polymerizing 1,3-butadiene monomer in the presence of a catalyst system that is comprised of an organocobalt compound, an organoaluminum compound, a para-alkyl substituted phenol, and ortho-phenyl phenol, wherein the molar ratio of the para-alkyl substituted phenol to the organoaluminum compound is within the range of about 1.2:1 to about 1.8:1, wherein the molar ratio of the ortho-phenyl phenol to the organoaluminum compound is within the range of about 0.7:1 to about 1.3:1, and wherein the organaluminum compound is reacted with the ortho-phenyl phenol prior to coming in contact with the organocobalt compound.