Abstract: A rubber composition has: at least three types of diene polymers forming a plurality of polymer phases immiscible with each other; and silica, wherein: a diene polymer (B), of which glass transition temperature (Tg) is neither the highest nor the lowest among the diene polymers each having content of ?10% by mass with respect to the total mass of the diene polymers, has been modified by a compound containing silicon atom; the diene polymer (B) satisfies formula (i) shown below: St+Vi/2?33??(i) (In the formula, “St” represents content of bonded styrene (mass %) of the diene polymer (B) and “Vi” represents vinyl bond content (mass %) of a conjugated diene compound part of the diene polymer (B)); and the silica has content of ?25 parts by mass with respect to the total mass or 100 parts by mass of the diene polymers.

Abstract: An object of the present disclosure is to provide a rubber composition which can attain both low loss property and crack growth resistance on a high level. In order to achieve the object, the rubber composition of the present disclosure contains: a rubber component; carbon black having a DBP absorption of 50 to 100 cm3/100 g; a phenol resin; and a methylene donor, wherein a ratio of a 200% modulus value (M200) to a 50% modulus value (M50) is 5.0 or less (M200/M50?5.0).

Abstract: A rubber composition, capable of improving both on-ice performance and wear resistance of a tire, contains at least one type of diene polymer, silica, and a resin, wherein: 5 MP?storage elastic modulus (E?) of the rubber composition at ?20° C.?10 MPa; storage elastic modulus (E?) at ?20° C. and loss tangent (tan ?) at ?20° C. of the rubber composition satisfy formula (1) below; and a mass ratio of content (parts by mass) of the silica with respect to content (parts by mass) of the resin, or silica content/resin content, is in the range of 1.00 to 4.00. 0.02×(E??20° C.)+0.25?(tan ??20° C.)?0.65??(1) In the formula, (E??20° C.) represents storage elastic modulus (MPa) of the rubber composition at ?20° C. and (tan ??20° C.) represents loss tangent of the rubber composition at ?20° C.

Abstract: A rubber composition, capable of improving both on-ice performance and wear resistance of a tire, contains at least one type of diene polymer, silica, and a resin, wherein: 5 MP?storage elastic modulus (E?) of the rubber composition at ?20° C.?10 MPa; storage elastic modulus (E?) at ?20° C. and loss tangent (tan ?) at ?20° C. of the rubber composition satisfy formula (1) below; and a mass ratio of content (parts by mass) of the silica with respect to content (parts by mass) of the resin, or silica content/resin content, is in the range of 1.00 to 4.00. 0.02×(E??20° C.)+0.25?(tan ??20° C.)?0.65??(1) In the formula, (E??20° C.) represents storage elastic modulus (MPa) of the rubber composition at ?20° C. and (tan ??20° C.) represents loss tangent of the rubber composition at ?20° C.

Abstract: A rubber composition has: at least three types of diene polymers forming a plurality of polymer phases immiscible with each other; and silica, wherein: a diene polymer (B), of which glass transition temperature (Tg) is neither the highest nor the lowest among the diene polymers each having content of ?10% by mass with respect to the total mass of the diene polymers, has been modified by a compound containing silicon atom; the diene polymer (B) satisfies formula (i) shown below: St+Vi/2?33 ??(i) (In the formula, “St” represents content of bonded styrene (mass %) of the diene polymer (B) and “Vi” represents vinyl bond content (mass %) of a conjugated diene compound part of the diene polymer (B)); and the silica has content of ?25 parts by mass with respect to the total mass or 100 parts by mass of the diene polymers.

Abstract: This invention relates to a rubber composition capable of improving fracture properties and wear resistance of a tire, and more particularly to a rubber composition formed by compounding a non-compatible polymer blend, which comprises at least two rubber components and forms a polymer phase A and a polymer phase B, with a block copolymer comprising a block-a composed of the same monomer unit as a monomer unit forming the polymer phase A and a block-b composed of the same monomer unit as a monomer unit forming the polymer phase B, wherein at least one of the rubber components has at least one functional group.

Abstract: This invention relates to a rubber composition capable of improving fracture properties and wear resistance of a tire, and more particularly to a rubber composition formed by compounding a non-compatible polymer blend, which comprises at least two rubber components and forms a polymer phase A and a polymer phase B, with a block copolymer comprising a block-a composed of the same monomer unit as a monomer unit forming the polymer phase A and a block-b composed of the same monomer unit as a monomer unit forming the polymer phase B, wherein at least one of the rubber components has at least one functional group.