| 摘要 |
PROBLEM TO BE SOLVED: To produce a dilithium initiator in a non-polar solvent without using a polar compound containing one or more nitrogen or oxygen atoms, to obtain a polymer having a narrow mol.wt. distribution by using the obtained solution as such for a polymerization reaction, and further to obtain a polymer containing the 1,2-bond structures of conjugated diene polymer portions in a small amount, when a conjugated diene is used as a monomer. SOLUTION: This method for producing a dilithium initiator comprises reacting an organic monolithium compound with 1,3-diisopropenylbenzene in a molar ratio of 2/1 in a non-polar hydrocarbon solvent. The reaction is carried out in the presence of aπcomplexed compound having a benzene ring in aπ-complexed compound/organic monolithium compound molar ratio of 1/10 to 1,000/1 at a temperature of -20 to 60 deg.C.
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