| abstract |
The present invention uses an alkali metal compound and / or an alkaline earth metal compound as a polymerization initiator to copolymerize a conjugated diene compound and a nitrogen atom-containing vinyl compound, or a conjugated diene compound, an aromatic vinyl compound, and a nitrogen atom-containing vinyl compound to polymerize the polymer. A polymerization step of obtaining a conjugated diene-based polymer containing a nitrogen atom in the chain and having an active end, and a modification step of reacting a modified agent, which is a compound represented by the following formula (1), with an active end of the conjugated diene-based polymer It relates to a method for producing a modified conjugated diene polymer. (In formula (1), R < 1> -R < 4> represents a C1-C20 alkyl group or a C6-C20 aryl group each independently, R < 5> represents a C3-C10 alkylene group, R < 6> An alkylene group having 1 to 20 carbon atoms, m is an integer of 1 or 2, n is an integer of 2 or 3) |