Patent ID: 7365119

Claim:
A rubber composition for a tire tread comprising 1 to 150 parts by weight of a piezoelectric material, based on 100 parts by weight of a natural rubber and/or a diene synthetic rubber, wherein the piezoelectric material is at least one selected from the group consisting of BaTiO 3 , (Ba,Pb)TiO 3 , (Ba,Ca)TiO 3 , (K,Na)NbO 3 , (K,Li)NbO 3 , Pb(Zr,Ti)O 3 , Pb(Zr,Ti) O 3 containing composite perovskite, Pb(Zr,Ti)O 3 doped with La, Bi 4 Ti 3 O 12 , LiNbO 3 , LiTiO 3 , AIN, PbTiO 3 , copolymer of vinylidene fluoride and trifluoroethylene, copolymer of vinylidene cyanide and vinyl acetate, polyvinyl acetate iodide, and polyurea.