abstract |
In the present invention, there is provided a method for preparing a conjugated diene monomer, comprising: preparing a mixture of a molecular weight modifier and a conjugated diene monomer; And a step of polymerizing the mixture using a catalyst composition comprising a lanthanide-based rare earth element-containing compound, a modified methylaluminoxane, a halogen compound, and an aliphatic hydrocarbon-based solvent, wherein the content of the high cis- There is provided a method for producing a conjugated diene-based polymer capable of producing a conjugated diene-based polymer having a high linearity, a high linearity, and a narrow molecular weight distribution. |