A rubber composition for tires according to an embodiment includes a diene rubber, a filler, and a fatty acid ester of a polyoxyalkylene glyceryl ether, and 50 mass % or more of the filler is carbon black. A tire according to an embodiment includes the rubber composition for tires.

A tread additive composition to be combined with a base composition for tire treads to achieve low rolling resistance includes an elastomeric component, a first additive component, and a second additive component. The elastomeric component includes a first silane-grafted polyolefine elastomer. The first additive component including a polymer carrier, a reinforcing filler, silane-terminated liquid polybutadienes, and one or more process activators. The second additive component including a butadiene rubber, a hydrocarbon resin, sulfur; and one or more accelerators. Advantageously, the tread additive composition can decrease rolling resistance and improve fuel economy when combined with a base tread composition as compared to treads formed from the base tread composition without the tread additive composition.

To provide a method for producing a multicomponent copolymer with which a multicomponent copolymer having excellent rupture strength can be obtained, and a multicomponent copolymer, a rubber composition and a tire having excellent rupture strength. The method is a method for producing a multicomponent copolymer having a conjugated diene unit, a non-conjugated olefin unit and an aromatic vinyl unit, comprising adding a conjugated diene compound in divided portions into a reactor containing a catalyst and at least one selected from the group consisting of a non-conjugated olefin compound and an aromatic vinyl compound. The multicomponent copolymer is obtained with the production method. The rubber composition comprises the multicomponent copolymer as a rubber component. The tire uses the rubber composition.

An off-road tyre includes a tread portion being provided on a tread edge side with shoulder blocks arranged in a tyre circumferential direction. The shoulder blocks include at least one first shoulder block and at least one second shoulder block having a circumferential length greater than that of the at least one first shoulder block. The at least one first shoulder block includes a first ground contact surface, a second ground contact surface protruding outwardly from the first ground contact surface in a block height direction, and a first shallow groove extending between the first ground contact surface and the second ground contact surface.

Disclosed is a rubber composition which suppresses poor mixing or poor dispersion from occurring between an organic polymer material derived from natural rubber and an inorganic material such as silica and exhibits excellent viscoelastic properties, and a silane coupling agent composition used in the same. Also disclosed is a silane coupling agent composition comprising a protein modifying agent and a silane compound represented by Formula (1):

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wherein each of the variables is as defined herein.

A vehicle wheel includes two annular rim members, at least one annular flange member disposed between the two rim members, a securing member that secures relative positional relationship between adjacent members among the two rim members and the at least one flange member, a plurality of body springs that each connects adjacent members among the two rim members and the at least one flange member, and a plurality of linking springs linked to the plurality of body springs so as to restrict relative displacement between the plurality of body springs. At least part of each body spring in a width direction of the vehicle wheel protrudes further to an outer side in a radial direction of the vehicle wheel than the rim members and the flange member, and the plurality of body springs is provided at intervals over an entire circumferential direction of the vehicle wheel.

A method for producing a modified conjugated diene-based polymer includes polymerizing a monomer including a conjugated diene compound in the presence of an alkali metal compound or an alkali earth metal compound to obtain a polymer having an active terminal; (a modification) reacting the polymer having an active terminal with a compound [M] having a plurality of hydrocarbyloxysilyl groups to obtain a modified polymer; and a mixing the modified polymer with at least one compound [C] selected from a compound [N] having one hydrocarbyloxysilyl group and an alcohol having 6 to 20 carbon atoms.

Tyre (1) for heavy load vehicle wheels, having a tread band (8) comprising: —a plurality of circumferential grooves (3, 4, 5, 6); —a plurality of transverse grooves (15) extending between two axially consecutive circumferential grooves (3, 4, 5, 6), thus defining a plurality of blocks (21); —each block (21) comprising a radially outer top surface (7) and having a height (M) measured between said top surface and a bottom surface of a respective transverse groove (15); —said transverse grooves (15) comprising a first segment (16) having a width L1 and a second segment (17) having a width L2, where L2<L1; —said first segment (16) being at least partially delimited by walls of two circumferentially consecutive blocks (20, 21); —at least one filling element (18) contained within said first segment (16); —said at least one filling element (18) having a radially outer top surface (19), located radially inwardly relative to said top surface (7) of the block at a radial distance (D) between 5% and 50% of the height (M) of the blocks (21); —the plan surface area (A2) of said top surface (19) of said at least one filling element (18) being greater than 60% of the plan surface area (Ai) of said first segment (16); —said at least one filling element (18) being spaced apart from said walls (27, 28) along at least 70% of its perimeter (P).

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.

Vulcanizates with desirable properties such as reduced hysteresis and improved wear resistance can be obtained from a composition that includes particulate filler(s) and at least two types of terminally functionalized polymers. One type of polymer has a heterocyclic moiety at a terminus, while another type has at one of its termini an aryl group that includes at least two hydroxyl substituents. The functionalized polymers are provided by reacting terminally active polymers with, respectively, a heterocyclic nitrile and a compound that includes an aryl group having at least two directly bonded OG.sub.p substituents, where G.sub.p is a protecting group, and a substituent that can react with the active terminus. The protecting groups can be removed so as to provide a terminal moiety that includes an aryl group having at least two directly bonded hydroxyl groups.