Abstract: The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate.

Abstract: The present invention is to provide a bound stopper, which has high mechanical strength, is excellent in durability against fatigue breaking, settling or the like when a heavy load is repeatedly received, and is easy to be produced, in which the bound stopper comprises a polyurethane foam obtained from a polyurethane foam composition containing an isocyanate component and a blowing agent, and the isocyanate component contains a urethane prepolymer having an isocyanate group, the urethane prepolymer being obtained from a polyol component, a polyrotaxane containing a cyclic molecule having an active hydrogen group as a constituent, and an isocyanate.

Abstract: A manufacturing method for annular run-flat tire support which has a supporting part and a leg part, and which, at the time of run-flat running, is capable of carrying load, comprises the steps of supplying said supporting part and said leg part, applying a bonding agent including a chemical conversion treatment to the bonding region of the radial-direction inside end part of said supporting part that is provided for bonding to said leg part, and bonding between said radial-direction inside end part and said leg part. Thereby, a manufacturing method for run-flat tire support which maintains a high bondability between the supporting part and the leg part, and is excellent in durability, and a run-flat tire support are provided.

Abstract: Provided is an annular supporter for a run-flat tire which comprises a supporting part and a leg part and which can support a load in run-flat running, wherein the leg part comprises a rubber composition comprising a rubber component which contains 60 mass parts or more of a conjugate diene base rubber such as isoprene rubber or natural rubber per 100 mass parts of the rubber component.

Abstract: A manufacturing method for annular run-flat tire support which has a supporting part and a leg part, and which, at the time of run-flat running, is capable of carrying load, comprises the steps of supplying said supporting part and said leg part, applying a bonding agent including a chemical conversion treatment to the bonding region of the radial-direction inside end part of said supporting part that is provided for bonding to said leg part, and bonding between said radial-direction inside end part and said leg part. Thereby, a manufacturing method for run-flat tire support which maintains a high bondability between the supporting part and the leg part, and is excellent in durability, and a run-flat tire support are provided.

Abstract: A rubber composition comprising as a rubber component a specified styrene-butadiene copolymer (A) and a styrene-isoprene copolymer of a specified hydrogenation ratio (B) wherein a bound styrene content of the copolymer (B) is larger by a given value than a bound styrene content of the copolymer (A) is good in the wear resistance and fracture property and further excellent in the wet-skid resistance and dry gripping property.

Abstract: A rubber composition comprising as a rubber component a specified styrene-butadiene copolymer (A) and a styrene-isoprene copolymer of a specified hydrogenation ratio (B) wherein a bound styrene content of the copolymer (B) is larger by a given value than a bound styrene content of the copolymer (A) is good in the wear resistance and fracture property and further excellent in the wet-skid resistance and dry gripping property.