| 摘要 |
[PTOBLEM TO BE SOLVED] To provide a conjugated diene polymer that bears a halogen atom at a terminal of a polymer chain, the halogen atom permitting easy introduction of a desired functional group into the terminal of the polymer chain, and exhibits excellent moldability, and a method for producing the same. [SOLUTION] The conjugated diene polymer comprising at least a conjugated diene monomer unit, wherein the conjugated diene polymer has a number-average molecular weight (Mn) in terms of polystyrene of 1,000 to 1,000,000, a ratio (Mw/Mn) of a weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of lower than 2.0 and the polymer bears a halogen atom at a terminal of the polymer chain. The method for producing the conjugated diene polymer comprises subjecting a monomer containing at least a conjugated diene to living radical polymerization using a polymerization initiator comprising a halogenocyclopentadienyl triorganophosphine · 2 -olefin ruthenium complex represented by formula (6) (wherein R 11 , R 12 , R 13 and R 14 each represent a hydrogen atom, a cyano group, a carbonyl group, an ester group, an amide group, a nitro group or a halogen atom (with the proviso that at least one of R 11 , R 12 , R 13 and R 14 is not a hydrogen atom) ; R 15 represents a chlorine atom, a bromine atom or an iodine atom; R 16 , R 17 and R 18 each represent an optionally substituted organic group having 1 to 10 carbon atoms; R 16 , R 17 and R 18 may be the same as or different from each other; and L represents an optionally substituted cyclopentadienyl ring) and an organic halide. |
