Rubber composition and method for preparing the same

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The present invention relates to a rubber composition with excellent machinability comprising a rare earth metal-catalyzed conjugated diene-based polymer, and to a manufacturing method thereof. The rubber composition can be excellent in machinability by containing the rare earth metal-catalyzed conjugated diene-based polymer having a long-chain branch index and a solution viscosity in a specific range and carbon black excellent in affinity with the rare earth metal-catalyzed conjugated diene-based polymer.(AA) Comparative example 2(BB) Example 1COPYRIGHT KIPO 2018