| 摘要 |
<p>A rubber composition obtained by mixing 100 parts by weight of at least one diene rubber selected from a group consisting of natural rubber, butadiene rubber, styrene-butadiene rubber, isoprene rubber and ethylene-propylene-diene terpolymer, characterised by: 5 to 50 parts by weight of a carbon black having an average particle size of primary particle of not less than 20 nm, a compression DBP oil absorption number of not more than 120 m l /100 g and a CTAB specific surface area of not more than 130 m<2>/g, 10 to 60 parts by weight of a precipitated silica having a DBP oil absorption number of not less than 200 m l /100g, a BET nitrogen adsorption specific surface area of not more than 180 m<2>/g, and a silane coupling agent in an amount in the range represented by equation (1) in the case where C=2.6 to 5.1: <MATH> wherein X is a maximum amount of the silane coupling agent (unit is parts by weight) per 100 parts by weight of the precipitated silica, A is the number (unit is per nm<2>) of silanol groups existing per 1 nm<2> of surface area of the precipitated silica, B is BET nitrogen adsorption specific area (unit is m<2>/g) of the precipitated silica, C is a factor showing reactivity of the silane coupling agent to the precipitated silica, D is a molecular weight of the silane coupling agent, E is Avogadro's constant (6.022 x 10<23>).</p> |
