MODIFIED CONJUGATED DIENE RUBBER, METHOD FOR PRODUCING SAME, AND RUBBER COMPOSITION

摘要

Provided is a method for producing a conjugated diene rubber useful as a starting material for a crosslinked rubber capable of being used in a tire tread and the like in order to reduce fuel consumption. The method for producing a modified conjugated diene rubber comprises: (a) a step for obtaining a modified conjugated diene polymer by reacting a conjugated diene polymer which has alkali metal or alkaline earth metal active terminals and is obtained by polymerization of a conjugated diene compound and an aromatic vinyl compound, with a first alkoxysilane compound having alkoxysilyl groups comprising two or more alkoxy groups and at least one group capable of becoming an onium in the presence of an onium-producing agent; and (b) a step for mixing the resulting modified conjugated diene polymer, the onium-producing agent, a second alkoxysilane compound having alkoxysilyl groups and at least one group capable of becoming an onium in the presence of the onium-producing agent, and, as a condensation catalyst, an alkoxysilane compound containing a metal element.