Patent ID: 8809440

Claim:
A method of producing a modified conjugated diene rubber, the method comprising: (a) reacting a first alkoxysilane compound comprising a group, which is a protected group protected from an alkali metal or alkaline-earth metal active terminal of a conjugated diene polymer, and after deprotection, is convertible to onium by an onium generator, and an alkoxysilyl group comprising at least two alkoxy groups, with the conjugated diene polymer comprising the alkali metal or alkaline-earth metal active terminal and obtained by polymerizing a conjugated diene compound or a conjugated diene compound and an aromatic vinyl compound, thereby obtaining a modified conjugated diene polymer comprising the group convertible to onium and the alkoxysilyl group; and (b) mixing the modified conjugated diene polymer with an onium generator and a second alkoxysilane compound comprising an alkoxysilyl group and a group convertible to onium by the onium generator; and (c) bringing a mixture obtained in (b) into contact with water.