Patent ID: 8436097

Claim:
A process for producing a modified polymer rubber comprising the steps of: (1) polymerizing a conjugated diene monomer or a combination thereof with an aromatic vinyl monomer in a hydrocarbon solvent, in the presence of a compound represented by the following formula [3], to form an alkali metal end-carrying active polymer, and (2) reacting the alkali metal end-carrying active polymer with a coupling agent represented by formula [1] and an isocyanurate compound represented by the following formula [2] in a hydrocarbon solvent, wherein the coupling agent is added in an amount of 0.005 to 0.4 mole per one mole of the active polymer: wherein E in the formula [3] is a group which contains a nitrogen atom having a substituent; T therein is a conjugated diene monomer unit or an aromatic vinyl monomer unit; m therein is an integer of 0 to 10; n is an integer of 1 to 10; J therein is an alkali metal; R in formula [1] is an alkyl group, an alkenyl group, a cycloalkenyl group, or an aromatic hydrocarbon group; M is a silicon atom or a tin atom, X is a halogen atom, c is an integer of 0 to 2, and d is an integer of 2 to 4, each of le to R 3 in the formula [2] is independently of one another an alkyl group having 1 to 8 carbon atoms; each of R 4 to R 9 therein is independently of one another an alkoxy group having 1 to 8 carbon atoms or an alkyl group having 1 to 8 carbon atoms; and each of p, q and r therein is independently of one another an integer of 1 to 8.