Abstract:
A tread composition for low rolling resistance tires, comprising 100 parts by weight of styrene-butadiene rubber or a styrene-butadiene rubber-based rubber blend and 3.2-5.0 parts by weight of sulphur.
Abstract:
A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.
Abstract:
A radial tire having an under-tread layer between a cap tread and a breaker layer is disclosed. As the material for the cap tread, a rubber composition is employed which contains 0.5 to 1.6 parts by weight of sulfur per 100 parts by weight of starting rubber components consisting of 25 to 75 parts by weight of polybutadidne rubber having 65 to 90 mol % of 1,2-bonding units and 75 to 25 parts by weight of natural rubber and/or polyisoprene rubber, and which has elongation at break of at least 330% at 100.degree. C. A rubber composition containing 1.6 to 10 parts by weight of sulfur per 100 parts by weight of rubber components is used for the under-tread layer.
Abstract:
A pneumatic radial tire for passenger cars having a low rolling resistance is disclosed. The radial tire comprises a body reinforcement including a toroidal carcass composed of radially arranged cords and a belt superimposed about the carcass and consisting of plural rubberized plies each containing cords arranged at 60.degree.-80.degree. with respect to the radial plane of the tire, which cords of said plies being crossed with each other, and a bead reinforcement wherein the carcass is wound around a bead core to form a turnup portion, thread and sidewall rubbers covering these reinforcements. In the radial tire, a super-hard bead filler rubber is arranged at a region extending from the bead core to the middle part of the side portion, and a base rubber having a low loss modulus and a high resilience is arranged on at least both side edge parts of the belt at a volume ratio in the coating rubber for tread portion of 0.1-0.5.
Abstract:
A process for preparing a rubber composition for tire treads having resilience, wet skid resistance and wear resistance well balanced with each other, by mechanically mixing a specific amount in total of a halogenated butyl rubber, natural rubber or a polyisoprene rubber and a polybutadiene rubber with a specific amount of carbon black and with other additives in the first mixing step and then mechanically mixing the resulting mixture with the remainder of the rubber ingredients and carbon black in the second mixing step thereby to obtain the rubber composition.
Abstract:
Rubber compositions containing therein as a source of carbon disulfide at least one compound selected from the group consisting of cyclic bis (thiocarbamoyl) mono- or di-sulfides, cyclic bis (thioxanthogenyl) mono- or di-sulfides, and cyclic (thiocarbamoyl-thioxanthogenyl) mono- or di-sulfides and an amine-isocyanate addition compound as a vulcanization accelerator system having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.
Abstract:
Rubber compositions containing an alkylene-bisdithiocarbamate and an amine-isocyanate addition compound as a vulcanization accelerator having excellent scorching stability with rapid vulcanization at usual vulcanization temperatures.
Abstract:
A rubber-rubber bonded composite structure is made up of one unvulcanized preform formed from a rubber comprising hydrogenated acrylonitrile-butadiene rubber, either a combination of methacrylic acid and zinc oxide or zinc methacrylate, and an organic peroxide and another unvulcanized preform formed from a rubber composition containing a rubber in common use, both preforms having been laminated together into an integrally bonded structure by vulcanization. The resulting structure exhibits good rubber-to-rubber adhesion.
Abstract:
A pneumatic tire for automobile having an inner liner of a thin film of ultra high molecular weight polyethylene, which film is laminated directly over an inner wall of green tire and firmly bonded thereto when the tire is vulcanized.
Abstract:
A rubber composition for tire treads having improved rolling resistance and wet road braking performance, comprising (I) a chlorinated butyl rubber and/or a brominated butyl rubber, (II) natural rubber and/or a polyisoprene rubber and, if desired, (III) a polybutadiene rubber in specific blending ratios.