| 摘要 |
A process for producing polybutadiene of a high degree of polymerization having high 1,2 and cis-1,4 microstructure contents and a low trans-1,4 microstructure content, which comprises polymerizing 1,3-butadiene in the presence of a catalyst system composed of (1) a halogen-containing organoaluminum compound, (2) (a) a cobalt dithiocarbamate compound or (b) the reaction product of carbon disulfide, a secondary amine and a cobalt compound, and (3) water. The polybutadiene has for example (A) a 1,2 microstructure content of 7 to 50%, (B) a cis-1,4 microstructure content of at least 50%, (C) a trans-1,4-microstructure content of at most 5%, (D) an inherent viscosity, measured in toluene at 30 DEG C., of at least 1, and (E) a gel content of at most 0.3%.
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