Abstract: This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass (4) and a belt (6) includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Abstract: Provided are a rubber composition which is improved in dispersion of silica into a rubber composition and improved in both of a low heat build-up and abrasion resistance and which is suitable as a tire tread member and a tire prepared by using the same. In a rubber composition compounded with precipitated silica, a cetyltrimethylammonium bromide-adsorbing specific surface area (CTAB) (m2/g) and the mode Aac (nm) in diameters of primary aggregates determined by acoustic measurement of particle size distribution satisfy equation (I) shown below: Aac??0.76×(CTAB)+274 and further an ignition loss (mass reduction % when heated at 750° C. for 3 hours) and a heating loss (mass reduction % when heated at 105° C. for 2 hours) satisfy equation (II) shown below: (ignition loss)?(heating loss)?3.

Abstract: This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass (4) and a belt (6) includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Abstract: This invention relates to a pneumatic tire wherein at least one of a carcass (4) and a belt (6) comprises a layer of steel cords covered with a coating rubber, and as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6) is used a rubber composition comprising a rubber component (A), 1-10 parts by mass of sulfur (B) and 0.1-10 parts by mass of a compound (C) including a substituted benzene ring, a compound (D1) having a particular structure or a composition (D2) consisting essentially of such a compound based on 100 parts by mass of the rubber component, and as the steel cord is used a steel cord formed by twisting a plurality of steel wires each plated on its peripheral face with a brass and having an amount of phosphorus as an oxide in a surface layer region from a surface of the plated brass to a depth of 5 nm inward in a radial direction of the wire controlled to not more than 1.5 atomic %.

Abstract: This invention relates to a pneumatic tire wherein at least one of a carcass (4) and a belt (6) comprises a layer of steel cords covered with a coating rubber, and as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6) is used a rubber composition comprising a rubber component (A), 1-10 parts by mass of sulfur (B) and 0.1-10 parts by mass of a compound (C) including a substituted benzene ring, a compound (D1) having a particular structure or a composition (D2) consisting essentially of such a compound based on 100 parts by mass of the rubber component, and as the steel cord is used a steel cord formed by twisting a plurality of steel wires each plated on its peripheral face with a brass and having an amount of phosphorus as an oxide in a surface layer region from a surface of the plated brass to a depth of 5 nm inward in a radial direction of the wire controlled to not more than 1.5 atomic %.

Abstract: This invention provides a rubber composition comprising 1-10 parts by mass of sulfur and 0.1-10 parts by mass of a compound represented by the following general formula (1) or a composition containing the compound as a main component based on 100 parts by mass of a rubber component as well as a pneumatic tire in which at least one of a carcass (4) and a belt (6) includes a layer composed of steel cords covered with a coating rubber, characterized in that the above rubber composition is used as the coating rubber covering the steel cords in at least one of the carcass (4) and the belt (6): (wherein R represents a divalent aliphatic group having a carbon number of 1-16 or a divalent aromatic group).

Abstract: The tire reinforcing member of the present invention comprises (a) at least one composite layer comprising a rubber composition and steel cords, and, optionally, (b) at least one rubber composition layer comprising a rubber composition, which adjoins to the composite layer. A basic inorganic filler is compounded into at least one rubber composition layer which constitutes the tire reinforcing member. The tire reinforcing member greatly enhances the endurance of a pneumatic tire by dramatically improving the resistance to loss of steel cord-to-coating rubber adhesion without affecting the initial adhesion.