| abstract |
Provided is a method for producing a conjugated diene polymer which can be used as a raw material of a crosslinked polymer which can improve the fuel economy of an automobile, and can be used as a tire for automobiles. A method for producing a modified conjugated diene polymer, comprising a polymerization step of at least one compound selected from the group consisting of the following formulas (1) and (2), and an alkali metal compound or an alkaline earth metal In the presence of a compound, a monomer containing a conjugated diene compound or a monomer containing a conjugated diene compound and an aromatic vinyl compound is polymerized to obtain a modified conjugated diene polymer. □□ (wherein A1 is a 3-substituted hydrocarbylalkylene group having at least one atom selected from the group consisting of N, P and S, having no active hydrogen, and having an atom of the above N, P or S a functional group bonded to R1. R1 and R2 are a hydrocarbyl group. In the formula, R1, R2 and A1 which are present in plurality may be the same or different. |