| abstract |
PROBLEM TO BE SOLVED: To provide a method for producing a conjugated diene-based polymer which can promote polymerization in a living manner without causing a runaway reaction at a high monomer concentration and further increase the 1,2-vinyl content. To provide. SOLUTION: (R 2 ) 2 Mg and R 1 M 1 and / or R 1 OM 1 (wherein R 1 and R 2 are hydrocarbon compounds, O is an oxygen atom, and M 1 is at least one kind of alkali metal among Li, Na and K) And the molar concentration of each metal is [Mg] / A method for producing a conjugated diene polymer, comprising producing a conjugated diene polymer using a polymerization initiator having a ratio of [M 1 ] ≧ 1.5. |