Patent ID: 8642705
Filing Date: 2014-02-04
Classification: B60C,C08C

Abstract:
1. A process for producing a conjugated diene-based polymer which comprises conducting a first modification of a conjugated diene-based polymer having active chain ends, which is obtained by polymerizing a diene-based monomer singly or in combination with other monomers and has a content of a cis-1,4 unit of 75% by mole or greater in a conjugated diene portion of a main chain, by bringing the active chain ends into reaction with a hydrocarbyloxysilane compound, and conducting a second modification of a polymer obtained by the first modification by adding a hydrocarbyloxysilane compound in a presence of a condensation accelerator, wherein at least one of hydrocarbyloxysilane compounds represented by general formula (I) and partial condensation products thereof is used as the hydrocarbyloxysilane compound in the first modification, general formula (I) being: wherein A wherein, after the first modification is conducted by bringing the active chain ends into reaction with the hydrocarbyloxysilane compound represented by general formula (I) (hydrocarbyloxysilane compound I), at least one compound (hydrocarbyloxysilane compound II) selected from hydrocarbyloxysilane compounds represented by general formula (II) and/or partial condensation products thereof and hydrocarbyloxysilane compounds represented by general formula (III) and/or partial condensation products thereof and a condensation accelerator are added and brought into reaction with the polymer obtained by the first modification, general formula (II) being: wherein A wherein A