Rubber composition for tires, method for preparing rubber composition for tires, and tire

Abstract

Provided are a rubber composition for tires having low tan δ at approximately 60° C. and excellent breaking energy at approximately 25° C.; a method for preparing the rubber composition for tires; and a tire thereof. The present invention relates to a rubber composition for tires which contains a rubber component including an isoprene-based rubber, and which has a correlation length Ξb of 50 nm or less as determined by fitting the following Equations 1 to 6 to a scattering intensity curve I(q) obtained by X-ray scattering analysis or neutron scattering analysis: I ( q ) = A 1 + q 2 ⁢ ξ 2 + B ( 1 + q 2 ⁢ Ξ b 2 ) 2 + C ( 1 + q 2 ⁢ Ξ c 2 ) 2 ( Equation ⁢ ⁢ 1 ) ξ < Ξ b < Ξ c ( Equation ⁢ ⁢ 2 ) A = 8 ⁢ π ⁢ ⁢ N a ⁢ σ 2 ⁢ ξ 3 ( Equation ⁢ ⁢ 3 ) B = 4 ⁢ π ⁢ ⁢ N b ⁢ σ 2 ⁢ Ξ b 2 ( Equation ⁢ ⁢ 4 ) C = 4 ⁢ π ⁢ ⁢ N c ⁢ σ 2 ⁢ Ξ c 2 ( Equation ⁢ ⁢ 5 ) q = 4 ⁢ π ⁢ ⁢ sin ⁢ θ 2 λ ( Equation ⁢ ⁢ 6 ) A, B, C, ξ, Ξb, Ξc: fitting parameter q: scattering vector Na: number per unit volume (number/cm3) of scatterers having a correlation length ξ Nb: number per unit volume (number/cm3) of scatterers having a correlation length Ξb Nc: number per unit volume (number/cm3) of scatterers having a correlation length Ξc σ: electron density difference (electron·(cm−3)) between scatterers and the surrounding matrix or scattering length density difference (cm−2) between scatterers and the surrounding solvent θ: scattering angle λ: wavelength of X rays or neutrons.

Dependencies are inferred from the claim text.