Modifying agent and modified conjugated diene polymer prepared by using the same

To in the present invention, the conjugated diene by modified to easily introduce a functional filler affinity to the polymer chain to prevent the aggregation of my filler rubber composition increases the dispersibility of the filler can improve the processability of the rubber composition of the silane-based compound of formula 1 the modifier and the conjugated diene-based polymer prepared by using this modified is provided comprising a. Formula 1 (As defined in above Formula