| 摘要 |
PROBLEM TO BE SOLVED: To produce a vinyl-cis-butadiene rubber and a vinyl-cis-butadiene rubber composition improved in molding processability, tensile stress, tensile strength, flex crack growth resistance, etc. SOLUTION: This vinyl-cis-butadiene rubber is obtained by mixing (A) 1,3-butadiene with an inert solvent consisting essentially of a 4C fraction, (B) regulating the concentration of moisture in the resultant mixture, (C) adding AlRnX3-n [R is a 1-6C alkyl group or a cycloalkyl group; X is a halogen element; (n) is 1.5-2] which is one component of a cis-1,4 polymerization catalyst and a soluble cobalt compound that is another component of the cis-1,4 polymerization catalyst to the resultant mixture and carrying out the cis-1,4 polymerization and (D) making a syndiotactic-1,2 polymerization catalyst prepared from the soluble cobalt compound, the general formula: AlR3 (R is a 1-6C alkyl group or a cycloalkyl group) and carbon disulfide present in the obtained polymerization reactional mixture and conducting the syndiotactic-1,2 polymerization of the 1,3-butadiene.
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