Abstract: The present invention relates to a rubber composition for tire applications comprising: rubber polymer(s) comprising at least optionally-functionalized styrene-butadiene rubber (SBR) and at least one rubber selected from polybutadiene rubber (BR), natural rubber (NR), polyisoprene rubber (IR) and mixtures thereof, and at least one ester derived from renewable sources resulting from the esterification of trimer and/or dimer acids having the formula A-(COOH)q, with q being 2 or 3 and A being an acyclic, cyclic or polycyclic, saturated or unsaturated, linear or branched hydrocarbon group having from 3 to 69 carbon atoms, with acyclic or cyclic, saturated or unsaturated, linear or branched alcohols.

Abstract: The present invention relates to a cross-linkable rubber composition, the cross-linkable rubber composition comprising a natural rubber (NR), a filler, and a resin. The resin is a terpolymer of ethylene, acrylic ester and maleic anhydride and is present in an amount ranging from ?5 to ?20 phr.

Abstract: Proposed is a rubber composition for a tire tread, which includes: a solution-polymerized elastomer having a conjugated diene-based monomer unit, a solution-polymerized elastomer having an aromatic vinyl monomer unit and a conjugated diene-based monomer unit, or a combination thereof, at 100 parts by weight; and a plasticizer containing an aromatic petroleum resin and an aliphatic olefin polymer, at 10 to 50 parts by weight. Further, a manufacturing method of the rubber composition for a tire tread is proposed.

Abstract: A friction material comprising: (a) at least one lubricant, wherein the at least one lubricant includes an amount of graphite, and wherein at least about 30 percent by weight of the graphite has a particle size of greater than about 500 microns using a sieve analysis; (b) at least one metal containing constituent for imparting reinforcement, thermal conductivity, and/or friction when the friction material is brought into contact with a movable member, wherein the at least one metal containing constituent includes iron and an iron containing compound; (c) a micro-particulated material; (d) one or more filler materials; (e) optionally at least one processing aid; (f) a balance being an organic binder, wherein the organic binder has less than 1 percent by weight of free phenol; wherein the friction material is free of asbestos and substantially devoid of copper.

Abstract: A tire comprises a rubber layer comprising from 50% to 100% by mass of a rubber crumb having a ratio of the chloroform extract to the acetone extract of less than 2, the chloroform and acetone extracts being expressed as percentages by mass.

Abstract: The present technology provide a rubber composition including: 100 parts by mass of a diene rubber, from 30 to 100 parts by mass of carbon black and/or a white filler, from 1 to 20 parts by mass of silicone-based microparticles that have an average particle size from 5 to 500 ?m and that are three-dimensionally crosslinked, from 0.1 to 10 parts by mass of a nonionic surfactant, and from 1 to 20 parts by mass of thermally expanding microcapsules.

Abstract: An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): about 30 to about 50 phr of polybutadiene having a cis-1,4 linkage content of at least 95%; about 40 to about 70 phr of styrene/butadiene copolymer; about 0 to about 20 phr of natural rubber or polyisoprene; about 0 to about 30 phr of a processing oil; about 10 to about 30 phr of a hydrocarbon resin; about 50 to about 75 phr of a filler; a curative agent; an antioxidant; a silane coupling agent; and about 5 to about 30 phr of a butyl copolymer rubber containing about 85 to about 99.5 mol % C4-C7 isoolefin(s) and from about 0.5 to about 15 mol % C4-C14 conjugated dienes.

Abstract: A rubber composition for tires according to an embodiment is produced by kneading a diene rubber, silica, and a granular carbon nanotube prepared as a binder-coated, granulated carbon nanotube. A tire according to an embodiment comprises the rubber composition.

Abstract: To provide a rubber composition in which wet performance, wear resistance, low rolling resistance, and breaking resistance are highly balanced. A rubber composition comprising a rubber component comprising at least three polymers and a filler, wherein the rubber component is separated into at least two polymer phases: a polymer phase (1) with the highest tan ? peak temperature; and a polymer phase (2) with the lowest peak temperature; the polymer phases (1) and (2) are incompatible with each other; the polymer phase (1) at least comprises the modified conjugated diene-based polymers (A1) and (A2), and the filler; the modified conjugated diene-based polymer (A1) has a particular weight-average molecular weight and a particular contracting factor (g?); and when a filler concentration and an average aggregate area of the filler in the polymer phase (1) are defined as X and Y, respectively, an formula (1): Y<4.8X+1200 is satisfied.

Abstract: This invention is based upon the unexpected discovery that silica containing tire tread rubber performance characteristics, such as hysteresis and payne effect, can be significantly improved using low levels of coupling agents and increasing silanization times and temperatures. The rubbers formulations made in accordance with this finding are of particular value for use in the treads of winter tires. Such rubber formulations will typically be made using a maximum level of about 7 phf of silica coupling agent and will more typically contain 3 phf to 6 phf of the silica coupling. A silanization time of at least 4 minutes or 5 minutes (within the range of 4 to 10 minutes) at a temperature of at least 150° C. and preferably 160° C. (within the range of 150° C. to 180° C.) will also be used.

Abstract: The present invention is directed to a pneumatic tire having a tread comprising a vulcanizable rubber composition comprising, based on 100 parts by weight of elastomer (phr), up to 100 phr of a solution polymerized styrene-butadiene rubber; from 5 to 50 phr of a fatty acid monoester of formula 1 where R1 is selected from C1 to C8 linear or branched alkyl, C1 to C8 linear or branched alkenyl, and C2 to C6 linear or branched alkyl substituted with from one to five hydroxyl groups; R2 is C11 to C21 alkyl or C11 to C21 alkenyl; from 5 to 50 phr of a hydrocarbon resin having a Tg ranging from ?40° C. to 20° C.; less than 10 phr of a petroleum-derived oil; and from 50 to 130 phr of silica. optionally, from about 1 to 50 phr carbon black.

Abstract: A rubber composition for a tire, which does not require the addition of a compound when synthesizing rubber component and the modification of a rubber component, and a winter tire using the rubber composition are provided. The rubber composition for a tire contains fine particles of rotaxane having a straight chain molecule, acyclic molecule clathrating the straight chain molecule and blocking groups arranged at both terminals of the straight chain molecule such that the cyclic molecule does not desorb from the straight chain molecule, covered with silica; a rubber component comprising styrene-butadiene rubber; and at least one of carbon black and silica, wherein the total content of the fine particles, the carbon black and the silica (excluding silica covering rotaxane) is 70 to 150 parts by mass per 100 parts by mass of the rubber component.

Abstract: Provided are copolymers which provide improved overall performance in terms of fuel economy and wet grip performance, as well as rubber compositions and tires containing the copolymers. Included is a copolymer obtained by copolymerizing an aromatic vinyl compound, a conjugated diene compound, and a compound represented by the formula (1) below or by copolymerizing a conjugated diene compound and a compound represented by the formula (1) below, the copolymer having a weight average molecular weight of 1.0×103 to 2.5×106, wherein R1 and R2 may be the same or different and each represents a functional group containing at least two selected from the group consisting of carbon, hydrogen, and silicon, and R1 and R2 may be joined together to form a ring structure.

Abstract: There is provided a rubber composition which can provide a tire having an excellent balance of the breaking properties, the rolling resistance performance (low fuel consumption) and the wet grip performance. The rubber composition includes 100 parts by mass of a diene rubber, and 1 to 100 parts by mass of fine particles (A) having a glass transition point of ?70° C. to 0° C. and composed of a polymer comprising constituent units of at least one monofunctional monomer. The fine particles (A) have a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together.

Abstract: A studless tire having a tread composed of a rubber composition for a tread comprising 1 to 20 parts by mass of a farnesene resin and 1 to 20 parts by mass of a terpene resin based on 100 parts by mass of a rubber component.

Abstract: The tire has a radial carcass reinforcement intended to equip vehicles carrying heavy loads and running at sustained speed. The tire comprises a crown reinforcement, itself capped radially with a tread joined to two beads via two sidewalls. The tread comprises at least two radially superposed layers of polymeric compound, a radially outer first layer that comes into contact with the ground and a radially inner second layer. The second layer has a composition based on at least a diene elastomer, a reinforcing filler comprising predominantly a filler covered at least partially by silica, an agent for coupling the filler with the elastomer and a crosslinking system. The dispersion of the filler in the elastomeric matrix has a Z value greater than or equal to 70.

Abstract: The invention relates to a method for improving braking performance of a microporous friction material under wet conditions. A hydrophobic agent is added into the components for preparing microporous friction material. The microporous friction material is prepared from the following raw materials in percentage by weight: 10%-20% of nano-silica modified phenolic resin, 4%-14% of butadiene-styrene rubber, 5%-15% of glass fiber, 2%-11% of aramid pulp, 4%-15% of aluminum borate whisker, 4%-10% of hydrophobic agent and 3%-8% of calcium silicate, 1%-8% of artificial graphite, 2%-8% of coke, 2%-7% of mica, 5%-10% of cryolite and 4%-10% of diatomite.

Abstract: The present invention relates to a rubber composition having excellent abrasion resistance and improved tensile and viscoelastic properties by controlling compatibility among rubber components, and a tire manufactured using the same.

Abstract: A pneumatic tire comprising a tread composed of a rubber composition containing 30 to 120 parts by mass of silica having a BET specific surface area of 180 to 280 m2/g based on 100 parts by mass of a rubber component, wherein, under a normal state with no load where the pneumatic tire is mounted with a normal rim and filled with a normal internal pressure, a grounding surface shape in which a normal load is applied and the tread is pressed against a plane surface satisfies the following equation (1): 0.95?SL0/SL80?1.6 (wherein, SL0 is a ground contact length in a circumferential direction of the tire on a tire equator, and SL80 is a ground contact length in a circumferential direction of the tire on a position away from the tire equator by a distance in a tire axial direction of 80% of a tread grounding half width.

Abstract: Provided is a rubber composition for tires having low tan ? at approximately 60° C. and excellent fracture energy at approximately 25° C.

Abstract: Modified thermoplastic hydrocarbon thermoplastic resins are provided, as well as methods of their manufacture and uses thereof in rubber compositions. The modified thermoplastic resins are modified by decreasing the relative quantity of the dimer, trimer, tetramer, and pentamer oligomers as compared to the corresponding unmodified thermoplastic resin polymers, resulting in a product that exhibits a greater shift in the glass transition temperature of the elastomer(s) used in tire formulations. This translates to better viscoelastic predictors of tire tread performance, such as wet grip and rolling resistance. The modified thermoplastic resins impart remarkable properties on various rubber compositions, such as tires, belts, hoses, brakes, and the like. Automobile tires incorporating the modified thermoplastic resins are shown to possess excellent results in balancing the properties of rolling resistance, tire wear, snow performance, and wet braking performance.

Abstract: Provided are a rubber composition for tires having low tan ? at approximately 60° C. and excellent breaking energy at approximately 25° C.; a method for preparing the rubber composition for tires; and a tire thereof.

Abstract: A friction material composition of the present invention includes a fibrous base, a friction regulator, and a binder and has a copper content of 0.5 mass % or less in terms of copper element amount. The friction material composition contains regenerated cellulosic fibers as the fibrous base. In an embodiment of the friction material composition, the regenerated cellulose fiber has a fiber length of 2 mm to 20 mm.

Abstract: The invention relates to a rubber composition containing diene based elastomer(s) coupled with a silica coupler in situ in the rubber composition to a precipitated silica which is partially pre-hydrophobated with an alkylsilane, its preparation and to a tire containing a component comprised of such rubber composition.

Abstract: The invention relates to a sulfur-crosslinkable rubber mixture, to a vulcanizate thereof and to a vehicle tire. The sulfur-crosslinkable rubber mixture contains at least the following constituents: at least one diene rubber; and 10 to 300 phr of at least one silica; and 1 to 30 phf of at least one silane A having general empirical formula A-I) (R1)oSi—R2—(S—R3)q—S—X; and??A-I) 0.5 to 30 phf of at least one silane B having general empirical formula B-I) (R1)oSi—R2—(S—R3)u—S—R2—Si(R1)o??B-I) wherein q is 1, 2 or 3; and u is 1, 2 or 3; and X is a hydrogen atom or a —C(?O)—R8 group wherein R8 is selected from hydrogen C1-C20-alkyl groups, preferably C1-C17, C6-C20-aryl groups, preferably phenyl, C2-C20-alkenyl groups and C7-C20-aralkyl groups.

Abstract: An object is to provide a winter tire being excellent in performance on ice and performance for inhibiting clogging with snow and accretion of snow. The present invention relates to a winter tire having a tread composed of a rubber composition comprising 2.5 to 30 parts by mass of a cyclopentadiene-based resin and 5 to 100 parts by mass of silica based on 100 parts by mass of a rubber component comprising a natural rubber.

Abstract: A friction material includes a base, a deposit including a friction modifier, and a resin disposed throughout the friction material. The base includes aramid fibers present in an amount of from greater than 50 weight percent to 70 weight percent, based on a total weight of the base. The base also includes a filler present in an amount from 30 weight percent to less than 50 weight percent, based on a total weight of the base. The friction material is also free of a material having a thermal degradation temperature of less than 200° C. The friction material may have a porosity of from 60% to 85% as determined using ASTM D4404-10 and a median pore size of from 0.5 ?m to 50 ?m, as determined using ASTM D4404-10.

Abstract: The present invention provides: a rubber composition for tires which has excellent processability and has excellent low heat build-up when formed into a tire; and a pneumatic tire using the same. The rubber composition for tires of the present invention is a rubber composition for tires, the rubber composition containing a diene rubber (A) and a microparticle (B), a vinyl group content of the diene rubber (A) being from 5 to 35 mass %, the microparticle (B) being a mercapto group-containing organic microparticle in which a crosslinkable oligomer or polymer (b1) is crosslinked, an average particle size of the microparticle (B) being from 1 to 200 ?m, and a content of the microparticle (B) being from 1 to 55 parts by mass per 100 parts by mass of the diene rubber (A).

Abstract: Tire treads, especially tire treads for aircraft or for heavy vehicles, formed from a material that is based upon a cross-linkable rubber composition, the cross-linkable rubber composition comprising, per 100 parts by weight of rubber, between 40 phr and 100 phr of a polyisoprene rubber, between 0 and 60 phr of a highly unsaturated diene rubber and between 1 phr and 25 phr of a polyterpene resin having a glass transition temperature of between 50° C. and 120° C. The rubber composition further includes between 0.1 phr and 10 phr of a poly-thiosulfate anti-reversion agent having the formula: MO3S—S—X—S—SO3M wherein X is an alkylene radical or a radical comprising two or more alkylene units, pairs of which units being linked through an oxygen or a sulfur atom, through a group —SO2—, —NH—, —NH2+—, —N(C1-16alkyl)- or —COO—, or through an arylene or cycloalkylene radical and M is a metal.

Abstract: A modified diene elastomer is provided. The elastomer comprises: at least 70% by weight, with respect to the total weight of the modified diene elastomer, of a linear diene elastomer functionalized predominantly in the middle of the chain by an alkoxysilane group, optionally partially or completely hydrolysed to give silanol, the alkoxysilane group optionally bearing another functional group capable of interacting with a reinforcing filler, the alkoxysilane group bonded to the two branches of the diene elastomer via the silicon atom, the functionalized diene elastomer exhibiting a polydispersity index before fractionalization of less than or equal to 1.6; and more than 0 and up to 30% by weight, with respect to the total weight of the modified diene elastomer, of a star-branched diene elastomer exhibiting a polydispersity index before star-branching of less than or equal to 1.6, the Mooney viscosity of the modified diene elastomer varying from 30 to 80.

Abstract: A rubber composition including guayule rubber and 15 to 90 phr silica. The rubber can be cis-1,4 polyisoprene and include 15 to 90 phr silica and contain less than 20% of the proteins associated with Hevea rubber and further include at least a trace of resins present in other natural rubbers. The rubber can be cis-1,4 polyisoprene and further include between at least a trace and 3% by weight of resins present in guayule rubber. The rubber composition can further be comprised of a synthetic rubber and include between about 40-100 phr of guayule rubber, and silica. The silica can be hydrophobated.

Abstract: The present invention relates to a modified polymer having a high modification ratio and an excellent affinity with a filler, a method of preparing the same, a rubber composition including the modified polymer, and a molded article prepared from the rubber composition. The modified polymer according to the present invention may exhibit a high modification ratio by including functional groups in a polymer main chain and on at least one end thereof, and thus, an affinity with a filler, such as silica, may be excellent. Also, the rubber composition according to the present invention may have excellent processability by including the modified polymer having an excellent affinity with the filler, and, as a result, a processed product (e.g., tire) prepared by using the rubber composition may have excellent tensile strength, abrasion resistance, and wet road surface resistance.

Abstract: An object of the present invention is to provide a rubber composition which is excellent in wet grip performance and abrasion resistance without deteriorating fuel efficiency, and a tire having a tread composed of the rubber composition. The present invention relates to a rubber composition comprising a rubber component comprising 20 to 90% by mass of a rubber component A and 10 to 80% by mass of a rubber component B, wherein an SP value of the rubber component A is not less than 17.8 (J/cm3)1/2 and an SP value of the rubber component B is lower than the SP value of the rubber component A by not less than 0.6 (J/cm3)1/2, and a tire having a tread composed of the rubber composition.

Abstract: The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler including at least carbon black, having a specific surface area CTAB greater than or equal to 130 m2/g, a plasticizing hydrocarbon resin, the vitreous transition temperature of which, Tg, is greater than 20° C., and the softening point of which is less than 170° C., and a cross linking system, the dispersion of the filler in the elastomeric matrix having a Z score greater than or equal to 70.

Abstract: A preparation method of a rubber composition for a tire assures that good processability can be obtained even if a silane coupling agent having a mercapto group is blended. The preparation method of a rubber composition for a tire is characterized by initiating kneading of a rubber component and a specific polysulfide compound before kneading the rubber component and a silane coupling agent having a mercapto group.

Abstract: Provided herein are cured rubber compositions containing guayule natural rubber with 2.5-4 weight % resin and fillers. By the use of a specified cure package that contains increased amounts of sulfur and accelerator, the cured rubber compositions are found to exhibit strain induced crystallization (as can be observed by X-ray diffraction). Also provided are related methods for preparing the rubber compositions.

Abstract: The disclosure relates to a rubber composition based on at least one styrene/butadiene copolymer SBR, the SBR having a content of greater than or equal to 50 parts per hundred parts of elastomer, phr, a reinforcing filler comprising predominantly carbon black with a CTAB specific surface area of greater than or equal to 90 m2/g, wherein the composition comprises an aromatic dicyclopentadiene plasticizing resin comprising essentially styrene, ethylene and dicyclopentadiene units, at a content ranging from 2 to 40 phr, the composition containing less than 5 phr of another plasticizer.

Abstract: The present invention provides a rubber composition a tire, by which both low rolling resistance and wet grip performance can be achieved at high levels. This rubber composition for a tire is obtained by blending from 66 to 180 parts by weight of a silica having a nitrogen adsorption specific surface area of from 150 to 400 m2/g into 100 parts by weight of a diene rubber; a size Rss of aggregates of the silica forming a hierarchical structure being from 14 to 23 nm when the rubber composition is measured by ultra-small-angle X-ray scattering and an obtained scattering profile is applied to a Unified-Guinier function.

Abstract: The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler including at least carbon black, having a specific surface area CTAB greater than or equal to 130 m2/g, a plasticizing hydrocarbon resin, the vitreous transition temperature of which, Tg, is greater than 20° C. and the softening point of which is less than 170° C., and a cross linking system, the dispersion of the filler in the elastomeric matrix having a Z score greater than or equal to 70.

Abstract: A rubber composition for tires comprises a diene rubber, silica, and a silane coupling agent, and is characterized in that a function v of a shear modulus G? of the rubber composition at 0.28% shear stress at 110° C., a CTAB specific surface area (CTAB) of the silica, a volume fraction (?) of the silica in the rubber composition, and a stress at 100% elongation (M100) of the rubber composition satisfies the relationship of the following equation (i): G?=K×v, where K is a coefficient greater than 0 and not greater than 450, and v is represented by the following equation (ii): v=?×(1+0.0258×CTAB×M100) and is a real number not less than 2.5 and not greater than 20.

Abstract: The invention relates to vulcanizable rubber compositions comprising at least the following components: a) at least one functionalized polymer, b) at least one modified polybutadiene having a proportion of cis-1,4 units of >95% by weight and a proportion of 1,2-vinyl content of <1% by weight, the polybutadiene having been modified by means of sulphur chlorides after the polymerization, c) at least one silica, d) at least one further filler, e) at least one vulcanizing agent, f) at least one oil and g) optionally at least one further rubber additive.

Abstract: A friction material for a clutch pad comprising: a plurality of fibers; and, a filler material including at least 0.1% and at most 100% calcium silicate particles by weight based on total weight of the filler. A friction material for a clutch comprising: a plurality of fibers; a filler material including at least 0.1% and at most 40% calcium silicate particles by weight based on total weight of the friction material; the calcium silicate particles characterized by a specific surface area of at least 40 m2/g and an average particle size of at most 60 ?m; and, a binder. In an example aspect, the calcium silicate particles are characterized by a spherical morphology. In another example aspect, the calcium silicate particles are characterized by a specific surface area of about 105 m2/g and an average particles size of about 10 ?m.

Abstract: Disclosed is a rubber composition for tire treads and a tire manufactured using the same. The rubber composition for tire treads includes 50 to 200 parts by weight of a wet masterbatch, 60 to 70 parts by weight of a raw rubber, and 50 to 200 parts by weight of a carbon black, the wet masterbatch being prepared by reacting 50 to 200 parts by weight of a carbon black, 20 to 100 parts by weight of a plant based resin and 50 to 200 parts by weight of a processing oil with respect to 100 parts by weight of a styrene-butadiene latex, according to a batchwise method. Accordingly, high grip performance is exhibited under a condition of heavy load, high slip and high speed, thereby being applicable to an ultra-high performance tire.

Abstract: This invention relates to a tire with tread for promoting a combination of winter service at low temperatures and for promoting wet traction. The tread is of a rubber composition containing low Tg styrene/butadiene elastomer and cis 1,4-polybutadiene rubber, along with high Tg liquid styrene/butadiene polymer, traction resin and vegetable triglyceride oil.

Abstract: The invention relates to a tire rubber composition based on at least one diene elastomer, an inorganic filler as reinforcing filler, a coupling agent providing the bonding between the inorganic filler and the diene elastomer, characterized in that the coupling agent is an azosilane compound of following formula (I): (G1)3-a(G2)aSi—Z—NH—C(O)—N?N—C(O)—NH—Z—Si(G1)3-a(G2)a??(I) in which: G1, identical to or different from one another, each represent a monovalent hydrocarbon-based group chosen from branched or unbranched, substituted or unsubstituted alkyls, having from 1 to 18 carbon atoms, substituted or unsubstituted cycloalkyls or aryls, having from 5 to 18 carbon atoms, G2, identical to or different from one another, each represent a hydroxyl group or a monovalent group in the form (G3)n-OG1 in which G3 is a divalent linking group having from 1 to 18 carbon atoms and comprising one or more heteroatoms chosen from O, S, Si and N, n being a number equal to or higher than 0 and less than or equal to 18, Z r

Abstract: The present invention relates to rubber mixtures comprising respectively at least one rubber, one sulfur-containing alkoxysilane, one silicon-based filler, and one ?-mercaptocarboxylic ester of polyhydric alcohols.

Abstract: A rubber composition for tire tread contains a diene-based rubber including 30 wt % or more of a terminal modifying group-containing conjugated diene-based copolymer, silica, carbon black, and at least one of silane coupling agents represented by specified formulae. The total amount of silica and carbon black in the composition is 35 to 140 parts by weight relative to 100 parts by weight of the diene-based rubber, while the silane coupling agent content is 4 to 18 wt % on the silica content. The copolymer is produced by a specified method such that the aromatic vinyl monomer content in the copolymer is 38 to 48 wt %, the vinyl unit content in all the conjugated diene-based monomers is 20 to 35 mol %, the weight average molecular weight of the copolymer is 600,000 to 1,000,000, and the terminal modifying group in the copolymer contains a functional group which interacts with the silica.

Abstract: A rubber composition by which a rubber elastic body having both of excellent low rolling resistance and wet skid resistance and also having excellent mechanical strength and wear resistance can be obtained, a rubber elastic body, a tire, and a block copolymer are provided. The rubber composition of the present invention comprises a block copolymer (A) comprising a block (a-1) of a conjugate diene and an aromatic vinyl and a block (a-2) of a conjugate diene or the diene and an aromatic vinyl, a specific polymer (B) other than the copolymer, and a filler (C), wherein the block copolymer (A) has a specific functional group; the block copolymer (A) has two glass transition temperatures separated from each other by 5° C. or more within a range of ?100 to 20° C. in measurement in accordance with ASTM D3418; and the ratio of the block copolymer (A) is 10% by mass or more when the sum of the block copolymer (A) and the polymer (B) is taken as 100% by mass.

Abstract: Rubber composition for treads, providing pneumatic tires (particularly for passenger vehicles and sport utility vehicles) having both excellent abrasion resistance and good wet grip performance. The rubber composition also provides the tires with good fuel economy and elongation at break. The rubber composition includes, per 100% by mass of a rubber component, 40-75% by mass of BR and 25-55% by mass of SBR, and includes, per 100 parts by mass of the rubber component, 40-120 parts by mass of a silica having a nitrogen adsorption specific surface area of 160-270 m2/g and 15-50 parts by mass of a carbon black having a nitrogen adsorption specific surface area of 100-250 m2/g. A ratio of a total content of silica to a total content of SBR in the rubber composition is 0.70-2.50, and a ratio of a total content of carbon black to a total content of BR therein is 0.25-0.75.

Abstract: Provided is a pneumatic tire including a bead apex and/or sidewall reinforcing layer, which achieves balanced improvements in high-hardness properties, elongation at break, and self-heating properties to provide good run-flat durability while maintaining good processability. The pneumatic tire includes a bead apex and/or sidewall reinforcing layer formed from a rubber composition, the composition containing a rubber component (A) and carbon black (B), the rubber component (A) containing, per 100% by mass thereof: 10-75% by mass of a modified butadiene rubber (A1) with a cis content of 50% by mass or less; 5-40% by mass of a polybutadiene rubber (A2) containing 1,2-syndiotactic polybutadiene crystals; and 10-40% by mass of a diene rubber (A3) different from (A1) and (A2), the composition containing 35-65 parts by mass of carbon black (B) per 100 parts by mass of rubber component (A), the carbon black (B) having a BET specific surface area of 18-50 m2/g.