| abstract |
The present invention i) epoxidizing a part or all of the 1,4 double bond with an epoxidizing reagent which selectively epoxidizes the 1,4 double bond, ii) reacting the epoxidized polybutadiene with an alcohol or water to obtain polybutadiene Having a number-average molar mass of 300 to 20%, including 20 to 50% 1,4-double bonds and 50 to 80% 1,2-vinyl and 1,2-vinylvinyl double bonds, based on the amount of all double bonds, To 2000 g / mol of polybutadiene. |