Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more.

Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more with respect to a total mass of the styrene-alkylene block copolymer, and the rubber component contains a styrene butadiene rubber having a styrene content of 30 mass % or more.

Abstract: Provided is an anti oxidant supply composition that enables replenishment of a rubber article with anti oxidant without taking a long time. An anti oxidant supply composition comprises: a base material and 5 mass % or more of anti oxidant, wherein a solubility parameter (SP value) of the base material is less than 7.8 (cal/cm3)1/2.

Abstract: An object of the present disclosure is to provide a rubber composition capable of achieving both dry performance and wet performance at the same time without deteriorating a low loss property of a tire, and a solution thereof is a rubber composition including: a rubber component (A) including a natural rubber (A1), a synthetic rubber (A2) having a glass transition temperature (Tg) of ?50° C. or less, and a synthetic rubber (A3) having a glass transition temperature (Tg) of more than ?50° C.; and a thermoplastic resin (B) containing an aromatic monomer, with a content of the natural rubber (A1) in the rubber component (A) being 40% by mass or more, and a content of the thermoplastic resin (B) containing an aromatic monomer being 10 to 50 parts by mass based on 100 parts by mass of the rubber component (A).

Abstract: Provided is a tire on which cracks on sidewall portion outer surfaces are unlikely to progress. The tire comprises a depthwise structure on at least a part of a sidewall portion, the depthwise structure comprising, in a depth direction from a point on a sidewall portion outer surface, a depthwise part from the sidewall portion outer surface to 0.5 mm and a depthwise part II from 0.5 mm to 1.0 mm, wherein: the depthwise part I and the depthwise part II satisfy: the depthwise part I: peak temperature T1 of tan ? is ?20° C. or more and ?5° C. or less, and when tang at the peak temperature T1 is ?1 and storage modulus at the peak temperature T1 is E?1, ?1?0.90 and E?1?5 MPa; and the depthwise part II: when tan ? at peak temperature T1 is ?2, and storage modulus at peak temperature T1 is E?2, ?2<?1 and E?2<E?1.

Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more.

Abstract: Provided is a rubber composition that achieves both wet performance and low loss property while delivering excellent dry handling performance. A rubber composition comprises: a rubber component; and a styrene-alkylene block copolymer, wherein a total styrene content of the styrene-alkylene block copolymer is 30 mass % or more with respect to a total mass of the styrene-alkylene block copolymer, and the rubber component contains a styrene butadiene rubber having a styrene content of 30 mass % or more.

Abstract: An object of the present disclosure is to provide: a rubber composition having excellent low hysteresis loss properties and snow-gripping capability without lowering the wet-gripping capability; and a tire using the rubber composition. To achieve the object, a rubber composition of the present disclosure has: a rubber component including therein 50 mass % or more of a natural rubber, and a modified styrene-butadiene rubber which contains 1 mass % to 20 mass % of styrene; a resin having a glass transition temperature (Tg) higher than 0° C.; and a low-temperature plasticizer having a glass transition temperature (Tg) lower than ?50° C.

Abstract: An object of the present disclosure is to provide a rubber composition having satisfactorily low hysteresis loss, while maintaining high wear resistance. In order to achieve the object, a rubber composition contains: a rubber component having diene-based rubber therein; and a tetrazine compound.

Abstract: Provided is a rubber composition in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. Also provided is a tire in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. The rubber composition comprises a rubber component, a petroleum wax, and an antidegradant, wherein the petroleum wax comprises a C20-C34 hydrocarbon component and a C35 or higher hydrocarbon component, and a proportion of the C20-C34 hydrocarbon component is 15% by mass to 30% by mass and a proportion of the C35 or higher hydrocarbon component is 70% by mass to 85% by mass, based on a total mass of the C20-C34 hydrocarbon component and the C35 or higher hydrocarbon component.

Abstract: Provided is a rubber composition in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. Also provided is a tire in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. The rubber composition comprises a rubber component, a petroleum wax, and an antidegradant, wherein the petroleum wax comprises a C20-C34 hydrocarbon component and a C35 or higher hydrocarbon component, and a proportion of the C20-C34 hydrocarbon component is 15% by mass to 30% by mass and a proportion of the C35 or higher hydrocarbon component is 70% by mass to 85% by mass, based on a total mass of the C20-C34 hydrocarbon component and the C35 or higher hydrocarbon component.

Abstract: A rubber composition allows suppression of cracking and discoloration of a tire surface. The rubber composition includes a rubber component (A), a quinoline age resistor (B) including a polymer of 2,2,4-trimethyl-1,2-dihydroquinoline, and N-phenyl-N?-(1,3-dimethylbutyl)-p-phenylenediamine (C). The content ratio of the quinoline age resistor (B) is 0.1 mass % to 1.5 mass % in terms of the total amount of the rubber composition. The total content ratio of dimers and trimers of the 2,2,4-trimethyl-1,2-dihydroquinoline in the quinoline age resistor (B) is 60 mass % or more.

Abstract: Provided is a tire on which cracks on sidewall portion outer surfaces are unlikely to progress. The tire comprises a depthwise part I from a point on a sidewall portion outer surface to 0.5 mm on at least a part of a sidewall portion, wherein: the depthwise part I satisfies the following requirement: the depthwise part I: comprising a natural rubber, a butadiene rubber, and a thermoplastic elastomer; a peak temperature T1 (° C.) of tan ? is ?20° C. or more and ?5° C. or less; and when tan ? at the peak temperature T1 (° C.) is ?1 and a storage modulus at the peak temperature T1 (° C.) is E?1 (MPa), ?1?0.90 and E?1?MPa.

Abstract: The present invention aims to provide a steel cord-rubber composite that is, even when a rubber composition constituting coating rubber does not contain cobalt salt, excellent in adhesion to a steel cord and capable of suppressing a decrease in modulus. The steel cord-rubber composite according to the present invention is constituted by using the steel cord coated with a rubber composition containing organic acid metal salt containing 10 mass % or less of free acid.