Patent ID: 6586542
Filing Date: 2003-07-01
Classification: C08F

Abstract:
A process for controlling the degree of branch of high 1,4-cis polybutadiene, in which 1,3-butadiene is polymerized in a non-polar solvent using a catalyst prepared by aging a mixture of organo-nickel compound, boron trifluoride (BF3) compound and organo-aluminum compound with or without a conjugate diene compound, the process being characterized by adding to the mixture a dialkylzinc compound as an agent for controlling the degree of branch, said dialkylzinc compound being represented by the following formulaR1â€”Znâ€”R2 wherein R1 and R2 are same or different and include an alkyl group containing 1 to 5 carbon atoms.