Method of producing modified conjugated diene rubber, modified conjugated diene rubber, and rubber composition

摘要

There is provided a method of producing a conjugated diene rubber capable of being used as a starting material for a crosslinked rubber that can be used in applications such as tire treads and can raise the fuel efficiency. This method of producing a conjugated diene rubber comprises (a) a step of reacting a first alkoxysilane compound having in a molecule at least one group convertible to onium by an onium generator and at least one alkoxysilyl group that has at least two alkoxy groups, with a conjugated diene polymer having an alkali metal or alkaline-earth metal active terminal and obtained by polymerizing a conjugated diene compound and an aromatic vinyl compound, thereby to obtain a modified conjugated diene polymer that has the group convertible to onium and the alkoxysilyl group, and (b) a step of mixing the resulting modified conjugated diene polymer with the onium generator and a second alkoxysilane compound having in a molecule at least one alkoxysilyl group and at least one group convertible to onium by the onium generator.

主权项

1. 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.