Patent ID: 7625981

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 an alkali metal catalyst, 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 the following formula [1] and an isocyanurate compound represented by the following formula [2] in a hydrocarbon solvent, or reacting the alkali metal end-carrying active polymer with the isocyanurate compound in a hydrocarbon solvent: wherein R in the formula [1] is an alkyl group, an alkenyl group, a cycloalkenyl group or an aromatic hydrocarbon group; M therein is a silicon atom or a tin atom; X therein is a halogen atom; c therein is an integer of 0 to 2; d therein is an integer of 2 to 4; each of R 1 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; and wherein the polymer rubber has improved impact resistance compared to a polymer rubber produced in the absence of the isocyanurate compound of formula [2].