| abstract |
The present invention relates to a method for preparing a conjugated diene-based polymer and a method for preparing a graft copolymer comprising same, the methods preparing a second conjugated diene-based polymer via multi-stage enlargement of a first conjugated diene-based polymer, wherein the multi-step enlargement comprises a primary enlargement step and a secondary enlargement step, and the weight ratio of an acid injected to the primary enlargement step and the secondary enlargement step is 70:30 to 90:10. By using a graft copolymer prepared by the aforementioned preparation method, a thermoplastic resin molded product having excellent plating characteristics, mechanical characteristics, surface characteristics, coloring properties, and workability can be produced. |