PROBLEM TO BE SOLVED: To provide a method for producing vinyl-cis-polybutadiene rubber excellent in extrusion workability, tensile stress and fatigue resistance.;SOLUTION: The method for producing vinyl-cis-polybutadiene rubber comprises: mixing (A) vinyl-cis-polybutadiene which is obtained through (1) a step of preparing a mixed solution in which 1,2-polybutadiene is mixed to a mixture mainly composed of 1,3-butadiene and a hydrocarbon-based organic solvent to perform cis-1,4-polymerization of 1,3-butadiene and (2) a step of performing 1,2-polymerization of 1,3-butadiene at lower than 60°C in the presence of a catalyst obtained from a soluble cobalt compound, an organic aluminum compound represented by general formula AlR3, and carbon disulfide in the resulting polymerization reaction mixture; and (B) cis-polybutadiene which is obtained through a step of performing cis-1,4-polymerization of 1,3-butadiene with addition of a cis-1,4-polymerization catalyst.;COPYRIGHT: (C)2013,JPO&INPIT
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