MANUFACTURE OF CONJUGATED DIENE POLYMER

PURPOSE:To obtain titled polymer of good processability, sueful for tires, etc., by the polymerization, under a specific condition, in a hydrocarbon solvent, of a conjugated diene, etc., using an organolithium compound, in the presence of tetrahydrofuran, 1,2-butadiene, etc., followed by coupling with a halogenated tin compound. CONSTITUTION:The objective polymer can be obtained by first carrying out a polymerization, in a hydrocarbon solvent, of a conjugated diene (e.g., 1,3-butadiene) or a conbination of it with a vinyl aromatic compound (e.g. styrene) using an organolithium compound (e.g. n-butyllithium) as an initiator, in the presence of (A) at least one sort of compound selected from tetrahydrofuran or its derivatives, dioxane, o-dialkoxybenzenes, and o-carboxylic esters, and (B) one or more sorts of compounds selected from 1,2-butadiene, dihydronaphthalene, 1,4-pentadiene, toluene, diphenylmethane, and triphenylmethane under such condition that an initiation temperature is -10-+50 deg.C and the maximum temperature during the polymerization is 60-120 deg.C and also, the difference between the maximum and initiation temperatures is 40 deg.C or more, followed by coupling with a halogenated tin compound.