| 简介 |
PROBLEM TO BE SOLVED : To provide a rubber composition that can improve wet grip performance, abrasion resistance and tensile performances in a well balanced manner, and a pneumatic tire having a tread manufactured by using the rubber composition.
SOLUTION : The rubber composition includes : a rubber component comprising an oil-extended butadiene rubber having a cis content of 95 mol% or more, a vinyl content of 1.2 mol% or less, and a weight average molecular weight of 530000 or more, and/or a styrene-butadiene rubber having a bonded styrene amount of 10 to 60 mass% and a weight average molecular weight of 800000 or more; an inorganic reinforcement agent represented by formula : mM-xSiOy-zH2O, which has a nitrogen adsorption specific surface area of 10 to 60 m2/g; and silica having a nitrogen adsorption specific surface area of 100 m2/g or more and/or carbon black having a nitrogen adsorption specific surface area of 100 m2/g or more. The oil-extended butadiene rubber is a butadiene rubber synthesized by using a rare earth catalyst; and the total content of the oil-extended butadiene rubber and the styrene butadiene rubber in the rubber component is 10 to 100 mass%. With respect to 100 parts by mass of the rubber component, the inorganic reinforcement agent is included by 1 to 70 parts by mass, and the silica and the carbon black in total are included by 50 parts by mass or more. In the formula of the inorganic reinforcement agent, M represents at least one metal selected from the group consisting of Al, Mg, Ti, Ca and Zr or an oxide or hydroxide of the metal; m represents an integer of 1 to 5; x represents an integer of 0 to 10; y represents an integer of 2 to 5; and z represents an integer of 0 to 10.
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