| abstract |
PROBLEM TO BE SOLVED: To provide a catalyst and a method for stereospecifically living-polymerizing a conjugated diene, and an isoprene-based polymer and a butadiene-based copolymer having a specific microstructure and a narrow molecular weight distribution. SOLUTION: A group IV transition metal compound (A) having a cyclopentadienyl skeleton in which one hydrocarbon group is directly bonded to a cyclopentadiene ring; organic aluminum oxy compounds (a) and (A); An ionic compound (b) capable of reacting to form a cationic transition metal compound, Lewis acid compound (c) capable of producing a cationic transition metal compound by reacting with (A), and Periodic Tables I to III Conjugated diene polymerization catalyst comprising co-catalyst (B) selected from organometallic compound (d) of main group element metal; method for producing conjugated diene polymer using the same; and molecular weight having specific microstructure and Isoprene-based polymers and butadiene-based copolymers with a narrow distribution. |