Patent ID: 8394894

Claim:
A method for producing a conjugated diene polymer, comprising steps A and B: step A: a step of polymerizing monomers comprising a conjugated diene and a vinyl compound of formula (IV) below in a hydrocarbon solvent in the presence of an alkali metal catalyst to produce a polymer having an alkali metal originating from the catalyst at at least one terminus of a polymer chain comprising a conjugated diene-based monomer unit and a monomer unit based on the vinyl compound of formula (IV), wherein X 4 , X 5 , and X 6 independently denote a group of formula (IVa) below, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of X 4 , X 5 , and X 6 is a group of formula (IVa), wherein R 10 and R 11 independently denote a hydrocarbyl group having 1 to 6 carbon atoms, a substituted hydrocarbyl group having 1 to 6 carbon atoms, a silyl group, or a substituted silyl group, and R 10 and R 11 may be bonded so as to form, together with the nitrogen atom, a ring structure, and step B: reacting the resulting polymer in step A with a compound having a linkage of formula (II): wherein m denotes an integer of 1 to 10, and A denotes a nitrogen atom-containing functional group.