Process for production of modified conjugated diene polymers, modified conjugated diene polymers produced by the process, rubber compositions, and tires

摘要

A process for producing a modified conjugated diene based polymer includes a step (a) of reacting a silicon compound with a conjugated diene based polymer having an active end so that the reaction takes place at the active end, the silicon compound having a protected primary amino group in the molecule thereof and a silicon atom to which a hydrocarbyloxy group and a reactive group are bonded, to thereby modify the active end, and a step (b) of performing condensation reaction, in the presence of a titanium compound serving as a titanium-based condensation-accelerating agent. A rubber composition contains the modified diene polymer, and a tire is produced from the rubber composition.

主权项

1. A process for producing a modified conjugated diene based polymer, the process comprising
a step (a) of reacting a silicon compound with a conjugated diene based polymer having an active end so that the reaction takes places at the active end, the silicon compound having a protected primary amino group in the molecule thereof and a silicon atom to which a hydrocarbyloxy group and a reactive group are bonded, to thereby modify the active end, and a step (b) of performing condensation reaction which involves the group derived from the silicon compound and bonded to the active end of the conjugated diene based polymer, in the presence of a titanium compound serving as a titanium-based condensation-accelerating agent, wherein the protected amino group is capable of being deprotected by hydrolysis to be a primary amino group, and wherein the titanium compound is at least one selected from the group consisting of tetrakis(2-ethyl-1,3-hexanediolato)titanium and titanium di-n-butoxide bis(2,4-pentanedionate).