Abstract: This invention is a curable fluoroelastomer composition comprising a peroxide curable fluoroelastomer, 8 to 25 parts by weight, per hundred parts by weight fluoroelastomer, of carbon black having a nitrogen adsorption specific surface area (N2SA) of 25-130 m2/g and a dibutyl phthalate (DBP) absorption of 50-140 ml/100 g, and 0.1 to 8 parts by weight, per hundred parts by weight fluoroelastomer, of a plasticizer having at least one carbon-carbon double bond and at least one ester group.

Abstract: A cured fluoroelastomer rotary shaft lip seal comprises A) fluoroelastomer having at least 53 wt. % fluorine, and B) 10 to 50 parts by weight, per hundred parts by weight fluoroelastomer, of carbon black a nitrogen adsorption specific area of 70-150 m2/g and a dibutyl phthalate absorption of 90-180 ml/100 g.

Abstract: A cured fluoroelastomer part for use in oil and gas exploration and production comprises A) fluoroelastomer having at least 53 wt. % fluorine, and B) more than 20 parts by weight, per hundred parts by weight fluoroelastomer, of carbon black a nitrogen adsorption specific surface area of 70-150 m2/g and a dibutyl phthalate absorption of 90-180 ml/100 g.

Abstract: A cured fluoroelastomer hot air hose comprises A) fluoroelastomer having at least 53 wt. % fluorine, and B) 10 to 30 parts by weight, per hundred parts by weight fluoroelastomer, of carbon black a nitrogen adsorption specific surface area of 70-150 m2/g and a dibutyl phthalate absorption of 90-180 ml/100 g.

Abstract: A rubber composition for a tire containing (i) 100 parts by weight of a diene-based rubber and (ii) 0.5 to 25 parts by weight of a heat-expandable microcapsule including a shell, and a substance capable of vaporizing or expanding under heating to thereby generate a gas and a nonpolar oil, both encapsulated in the shell, wherein the shell is made of a thermoplastic resin obtained by polymerization of a nitrile-based monomer (I), a monomer (II) having an unsaturated double bond and a carboxyl group in the molecule thereof, an optional monomer (III) having two or more polymerizable double bonds, and an optional copolymerizable monomer (IV) for adjusting the expansion properties.

Abstract: A rubber composition for a tire containing (i) 100 parts by weight of a diene-based rubber and (ii) 0.5 to 25 parts by weight of a heat-expandable microcapsule including a shell, and a substance capable of vaporizing or expanding under heating to thereby generate a gas and a nonpolar oil, both encapsulated in the shell, wherein the shell is made of a thermoplastic resin obtained by polymerization of a nitrile-based monomer (I), a monomer (II) having an unsaturated double bond and a carboxyl group in the molecule thereof, an optional monomer (III) having two or more polymerizable double bonds, and an optional copolymerizable monomer (IV) for adjusting the expansion properties.

Abstract: A run flat tire wheel assembly having a run flat support member formed by a ring-shaped metal shell and rubbery elastic members in an inside cavity of a tire/rim, wherein the rubbery elastic members are comprised of at least two types of rubber differing at least at the vicinity of the bonded parts with the ring-shaped metal shell and the other locations and wherein the vicinity of the bonded parts with the ring-shaped metal shell is formed with a directly bondable rubber elastic member.

Abstract: A rubber composition containing 100 parts by weight of a diene-based rubber and 0.5 to 25 parts by weight of a heat expandable microcapsule composed of a thermoplastic resin particle having a substance enclosed therein, capable of vaporizing or expanding due to heat to thereby generate a gas, wherein a shell of the heat expandable microcapsule comprises a thermoplastic resin obtained by polymerization from, as a main component of a monomer, a nitrile-based monomer (I), a monomer (II) having an unsaturated double bond and carboxyl group in the molecule thereof, a monomer (III) having two or more polymerizable double bonds and, optionally, a copolymerizable monomer (IV) for adjusting the expansion characteristics, and a pneumatic tire using the same, whereby the tire weight is decreased and the ice traction thereof is improved.

Abstract: A rubber composition for a tire comprising 100 parts by weight of diene rubber and 1 to 30 parts by weight of expandable graphite having a particle size of 30 to 600 ?m.

Abstract: A rubber composition comprising 100 parts by weight of a diene rubber and 0.5 to 20 parts by weight of a foaming agent-containing resin containing 5 to 65% by weight of a chemical foaming agent, wherein the resin is mainly a polyolefin resin which is not co-crosslinkable with the diene rubber and wherein the rubber composition is structured having microcapsule-shaped bubbles coated with a resin layer after vulcanization of the rubber.

Abstract: A rubber composition for a tire comprising 100 parts by weight of diene rubber and 1 to 30 parts by weight of expandable graphite having a particle size of 30 to 600 &mgr;m.

Abstract: A rubber composition comprising 100 parts by weight of a diene rubber and 0.5 to 20 parts by weight of a foaming agent-containing resin containing 5 to 65% by weight of a chemical foaming agent, wherein the resin is mainly a polyolefin resin which is not co-crosslinkable with the diene rubber and wherein the rubber composition is structured having microcapsule-shaped bubbles coated with a resin layer after vulcanization of the rubber.

Abstract: A rubber composition for a tire tread improved in frictional performance on ice. A rubber composition for a tire tread comprised of 100 parts by weight of a diene-based rubber and 1 to 30 parts by weight of an expanded graphite finished by being expanded by heat treatment.

Abstract: A rubber composition for a tire tread containing 100 parts by weight of a diene-based rubber, 2 to 50 parts by weight of precipitated silica, 1 to 25 parts by weight of heat expandable microcapsules, or 1 to 25 parts by weight of heat expandable microcapsules and 1 to 20 parts by weight of heat expandable graphite, and 0.

Abstract: A rubber composition for a tire comprising 100 parts by weight of diene rubber and 1 to 30 parts by weight of expandable graphite having a particle size of 30 to 600 &mgr;m.