The method of manufacturing the same and butadiene polymer, and rubber composition and tire

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PROBLEM TO BE SOLVED : To provide a method of manufacturing a butadiene-based polymer in which the content of the cis-1, 4 bond of a butadiene monomer unit is high. SOLUTION : The method of manufacturing a butadiene-based polymer is characterized by polymerizing the monomer which at least contains 1, 3-butadiene under the presence of : a catalyst system; and a 2-10C unsaturated hydrocarbon which has a triple bond. The catalyst system comprises : a rare earth element-containing compound (A component) of atomic numbers 57-71 of the periodic table or a reaction compound of the compound with a Lewis base; an organoaluminum compound (B component) shown by general formula : AlR1R2R3, wherein R1and R2identically or differently are a 1-10C hydrocarbon group or a hydrogen atom, R3is a 1-10 hydrocarbon group, provided that R3may be the same as or different from the R1 or R2; and at one kind of halogen compound (C component) among a Lewis acid, a complex compound of a metal halide and a Lewis base, and an organic compound containing an active halogen. COPYRIGHT : (C)2012, JPO&INPIT