Tire polymer, a rubber composition and using the same

PROBLEM TO BE SOLVED: To provide a rubber composition which includes a new polymer having a specific nitrogen-containing compound and has an excellent balance between fuel economy and wet grip performance, and to provide a tire produced by using the rubber composition and having the properties. SOLUTION: There is provided a polymer obtained by copolymerizing a conjugated diene compound and/or an aromatic vinyl compound, with a nitrogen-containing styrene derivative having a specific structure, or a polymer whose at least one terminal end is modified with a modifier having a functional group containing at least one atom selected from nitrogen, oxygen and silicon. A rubber composition containing the polymer of ≥5 wt.% in 100 wt.% rubber ingredients and a tire using the rubber composition are provided. COPYRIGHT: (C)2010,JPO&INPIT