| abstract |
The present invention relates to a polymerization initiator represented by Chemical Formula 1, a modified conjugated diene polymer obtained by using the polymerization initiator, their production method, rubber containing the modified conjugated diene polymer Composition and tire prepared from said rubber composition. In Chemical Formula 1, Cy is a cyclic saturated hydrocarbon group having 5 to 8 carbon atoms that is unsubstituted or substituted by an alkyl group having 1 to 4 carbon atoms, and A 1 and A 2 are each independently represented by Chemical Formula 2 Indicated functional groups. In Chemical Formula 2, R is a linear hydrocarbon group having 1 to 20 carbon atoms, or a monocyclic or polycyclic saturated hydrocarbon group having 3 to 20 carbon atoms, and X is a divalent hydrocarbon group having 1 to 5 carbon atoms , M is an alkali metal, and a is 0 or 1. [chemical formula 1] [chemical formula 2] |