Patent ID: 6818710
Filing Date: 2004-11-16
Classification: C08F

Abstract:
A process for producing a modified polymer rubber, which comprises the steps of:(1) reacting one part by mol of an organoalkali metal compound with nÂ±0.7 (n is an integer of 3 or more) parts by mol of a compound represented by the following formula (1) to produce a reaction mixture, wherein R1 is an amino group, an alkoxy group, a silyloxy group, or an acetal group, (2) polymerizing in the presence of the produced reaction mixture an aromatic vinyl monomer and a conjugated diene monomer in a hydrocarbon solvent, and after completion of the polymerizing, stirring for at least 30 minutes, to produce a polymerization reaction mixture, and (3) repeating such an operation nâˆ’2 times that (i) an aromatic vinyl monomer and a conjugated diene monomer are added to the produced polymerization reaction mixture, and polymerized, and (ii) after completion of the polymerizing, stirring is carried out for at least 30 minutes, and thereby producing a modified polymer rubber, whose both ends an nâˆ’2 positions in its chain are modified by the compound represented by the formula (1).