Patent ID: 7459507

Claim:
A method for terminating anionic polymerization, in the course of preparing a homopolymer from conjugated diene monomers, in the course of preparing a conjugated diene copolymer from conjugated diene monomers, in the course of preparing a vinyl aromatic-conjugated diene copolymer from a vinyl aromatic monomer and a conjugated diene monomer, and in the course of preparing a block copolymer from a vinyl aromatic monomer and a conjugated diene monomer, all in the presence of an organic alkali metal compound as an anionic polymerization initiator, wherein said polymerization is terminated by mixing a phosphate ester and water to a nonpolar hydrocarbon solvent, wherein said phosphate ester is a mixture of mixture 1 and mixture 2 , wherein said mixture 1 is mixture of the compound represented by the formula (1) and the compound represented by the formula (2), and said mixture 2 is a mixture of the compound represented by the formula (3) and the compound represented by the formula (4): wherein R is a hydrogen atom or a C 1 -C 20 alkyl and n is the number of repeating units of the ion enclosed within parentheses.