Patent ID: 8299167

Claim:
A conjugated diene polymer comprising a conjugated diene-based constituent unit and a constituent unit of formula (I), at least one terminus of the polymer being modified by a compound which is a carboxylic acid amide compound of formula (III) as defined below, wherein X 1 , X 2 , and X 3 independently denote a group of formula (Ia), 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 hydroxy group or a group of formula (Ia), 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 R 31 denotes a hydrogen atom, a hydrocarbyl group having 1 to 10 carbon atoms, a substituted hydrocarbyl group having 1 to 10 carbon atoms, or a heterocyclic group having a nitrogen atom and/or an oxygen atom as a heteroatom, R 32 and R 33 independently denote a group having 1 to 10 carbon atoms, which may have at least one atom selected from the atomic group consisting of a nitrogen atom, an oxygen atom, and a silicon atom, R 32 and R 33 may be bonded so as to form, together with the nitrogen atom, a ring structure, and R 32 and R 33 may be a single group bonded to the nitrogen via a double bond, or at least one compound selected from the compound group consisting of a compound of formula (IVa) and a compound of formula (IVb): wherein m denotes an integer of 0 to 10, and R 41 and R 42 independently denote a hydrocarbyl group having 1 to 20 carbon atoms or a substituted hydrocarbyl group having 1 to 20 carbon atoms, wherein n denotes an integer of 0 to 10, and R 43 denotes a hydrocarbyl group having 1 to 20 carbon atoms or a substituted hydrocarbyl group having 1 to 20 carbon atoms, or at least one compound selected from the compound group consisting of a compound of formula (IVc) and a compound of formula (IVd): wherein r denotes an integer of 1 or 2, Y 1 denotes a nitrogen atom-containing group as a substituent on the benzene ring, and when there are a plurality of Y 1 s, the plurality of Y 1 s may be identical to or different from each other, wherein s denotes an integer of 1 or 2, t denotes an integer of 0 to 2, Y 2 and Y 3 denote nitrogen atom-containing groups as substituents on the benzene rings, when there are a plurality of Y 2 s the plurality of Y 2 s may be identical to or different from each other, and when there are a plurality of Y 3 s the plurality of Y 3 s may be identical to or different from each other.