Patent ID: 7132471

Claim:
A rubber composition comprising 100 parts by weight of a rubbery polymer and 5–150 parts by weight of an inorganic filler per 100 parts by weight of said rubbery polymer, wherein the haze of said rubber composition having a thickness of 5 mm is 50% or less, and the inorganic filler is dispersed so that the number of circular regions with a diameter of 0.5 μm or more having no inorganic fillers is one or less and the number of circular regions with a diameter of 0.3 μm or more having no inorganic fillers is three or less in an image of a 5 μm square of said rubber composition determined by a scanning probe microscope (SPM), and wherein said rubbery polymer comprises 5–80% by weight of a rubbery polymer component (A) having a refractive index of 1.535 or greater and less than 1.600 and 20–95% by weight of a rubbery polymer component (B) having a refractive index of 1.400 or greater and less than 1.530.