Patent ID: 8445583

Claim:
A conjugated diene polymer comprising a conjugated diene-based constituent unit and a constituent unit of formula (I) below, at least one terminus of the polymer being modified by a compound having a linkage of formula (III) below: wherein X 1 , X 2 , and X 3 independently denote a group of formula (Ia) below, a hydroxy group, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of X 1 , X 2 , and X 3 is a group of formula (Ia) below or a hydroxy group, wherein R 1 and R 2 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 1 and R 2 may be bonded so as to form, together with the nitrogen atom, a ring structure, wherein n denotes an integer of 0 to 10, R 3 denotes a hydrocarbyl group having 1 to 5 carbon atoms, R 4 , R 5 , R 6 , and R 7 independently denote a hydrogen atom, a hydrocarbyl group having 1 to 5 carbon atoms, a substituted hydrocarbyl group having 1 to 5 carbon atoms, or a hydrocarbyloxy group having 1 to 5 carbon atoms, when there are a plurality of R 4 s and R 5 s the plurality of R 4 s and the plurality of R 5 s may be identical to or different from each other, R 8 and R 9 independently denote a group having 1 to 6 carbon atoms, which may have at least one type of atom selected from the atomic group consisting of a nitrogen atom, an oxygen atom, and a silicon atom, R 8 and R 9 may be bonded so as to form, together with the nitrogen atom, a ring structure, and R 8 and R 9 may be a single group bonded to the nitrogen via a double bond.