Abstract: Disclosed herein are a modified guayule resin product and related processes for preparing the modified guayule resin product. The modified guayule resin product comprises a mixture of argentatins having at least one functional group, wherein the at least one functional group is provided by a functionalizing compound selected from alkoxysilanes, mercaptosilanes and blocked mercaptosilanes. In a second embodiment, a process for preparing a modified guayule resin product is provided whereby a guayule resin component (comprising a mixture of argentatins) is mixed with a functionalizing compound selected from alkoxysilanes, mercaptosilanes and blocked mercaptosilanes to produce a modified guayule resin comprising functionalized argentatins having at least one functional group provided by the functionalizing compound.

Abstract: Provided with a tire temperature prediction unit 102 configured to calculate a predicted tire temperature at a specific time point based on a history of operation information of a vehicle (V1, etc.) mounted with tires (10a, etc.); a temperature tolerance calculation unit 104 configured to calculate a temperature tolerance at the specific time point; a determination unit 106 configured to determine whether or not the temperature tolerance is within a preset tolerance range; an information generation unit 202 configured to generate vehicle operation change information which changes operation of the vehicle when the determination unit 106 determines that the temperature tolerance is within the tolerance range; and a communication unit 201 configured to transmit the generated vehicle operation change information to the vehicle or to an external system 300 which manages the operation of the vehicle.

Abstract: The pneumatic tire for passenger vehicles according to the present disclosure comprises a carcass consisting of plies of radially arranged cords, spanning toroidally between a pair of bead portions; the cross-sectional width SW and the outer diameter OD of the tire satisfy a given relationship; the land portion has a plurality of width direction sipes extending in the tire width direction; the pitch length in the tire circumferential direction of the plurality of width direction sipes is 3 mm to 10 mm; and the width direction sipe has a widened portion on the sipe bottom side where the sipe width is larger than that on the tread surface side.

Abstract: A pneumatic tire includes, in a land portion, at least one circumferential sipe extending in the tire circumferential direction. At a first position, from the tread surface towards the sipe bottom, the sipe width gradually decreases from the tread surface to a first changing point and then gradually increases from the first changing point to the sipe bottom. At a second position, from the tread surface towards the sipe bottom, the sipe width gradually increases from the tread surface to a second changing point and then gradually decreases from the second changing point to the sipe bottom. The sipe width at the tread surface and at the sipe bottom gradually decreases in the tire circumferential direction from the first position towards the second position, and the sipe width in a tire radial intermediate portion gradually increases in the tire circumferential direction from the first position towards the second position.

Abstract: The present disclosure aims at providing an EPDM-containing rubber composition capable of exhibiting excellent adhesion to a metal member without necessitating inclusion of a cobalt salt of organic acid therein. Specifically, a rubber composition includes therein: a rubber component containing ?20 phr of EPDM; a rubber-metal adhesion promoter; a vulcanization accelerator other than a thiuram-based compound; and no thiuram-based vulcanization accelerator, wherein the rubber-metal adhesion promoter contains a specifically formulated metal salt of aliphatic carboxylic acid.

Abstract: A rubber crawler 1 includes an endless crawler body 12 made of rubber, and a plurality of cores 13 embedded in the crawler body and arranged along the crawler circumferential direction, where at least a first projection on the crawler width direction first side in a pair of first projections of each core has a first recess R1 on a surface facing a second projection of another core of the surfaces on the two sides in the crawler width direction.

Abstract: Disclosed herein are methods for improving the rolling resistance of a tire rubber composition by providing a rubber composition including a rubber component which includes a majority by weight of guayule rubber where the guayule rubber includes a bagasse component, and a filler component where the filler component is free of silica, and including at least one silane in the rubber composition, where the at least one silane is selected from the group consisting of mercaptosilanes, blocked mercaptosilanes, and alkoxysilanes. Also disclosed is a tire rubber composition which comprises (a) 100 parts of a rubber component including a majority by weight of guayule rubber where the guayule rubber includes a bagasse component, (b) a filler component, where the filler component is free of silica, and (c) at least one silane selected from the group consisting of mercaptosilanes, blocked mercaptosilanes, and alkoxysilanes.

Abstract: The run flat tire according to this disclosure comprises a tread portion, sidewall portions, bead portions, a side-reinforcing rubber, and a carcass. An inner liner is provided on the tire inner surface, and an inner layer rubber is disposed between the side-reinforcing rubber and the inner liner. In accordance with JIS K6270, when the dumbbell-shaped No. 8 specimens having 1 mm notch in a direction perpendicular to the direction of repeated tension at the center thereof are subjected to repeated tension at a frequency of 10 Hz under the conditions of 150° C., the number of repetitions until the specimen of the inner layer rubber fails is, in the range of 10% to 30% of the tensile strain applied, at least twice that of the side-reinforcing rubber, and in the reference condition, the ratio t2/t1 is 0.05 to 0.30.

Abstract: The pneumatic tire for passenger vehicles according to the present disclosure comprises a carcass consisting of plies of radially arranged cords, spanning toroidally between a pair of bead portions; the cross-sectional width SW and the outer diameter OD of the tire satisfy a given relationship; the tire has a tread portion with tread rubber; the rubber gauge of the tread portion is 2 mm or more and less than 5 mm; and the tread surface of the tread portion has one or more land portions, and a width direction sipe extending in the tire width direction is formed in the land portion so that there are two or more of the width direction sipes in the contact patch.

Abstract: In various embodiments, methods for extracting various constituents from Parthenium argentatum resin are disclosed. The methods begin with a nonpolar resin solution that is manipulated by polar solvent and water additions to precipitate low MW isoprene rubber and form separable aqueous polar and nonpolar liquid fractions, wherein the aqueous polar liquid fraction is rich in argentatins and the nonpolar liquid fraction is rich in guayulins. In other variations, an aqueous polar solvent is added to the nonpolar resin solution to directly produce a two-phase system. The extraction methods can be fully automated by using a continuous countercurrent liquid/liquid extractor.

Abstract: The pneumatic radial tire for passenger vehicles according to the present disclosure comprises a carcass consisting of plies of radially arranged cords, spanning toroidally between a pair of bead portions; the cross-sectional width SW and the outer diameter OD of the tire satisfy a given relationship; the tire has a tread portion with tread rubber; the rubber gauge of the tread rubber is 2 mm or more and less than 5 mm; and the negative ratio of the tread surface of the tread portion is 20% or less.

Abstract: An elastic crawler includes a plurality of elastic protrusion portions formed in a manner protruding on an inner circumferential face of a crawler main body, which is made of an elastic material and formed in an endless belt shape, at regular intervals in a crawler circumferential direction, and a resin cover member made of a resin material and covering a surface of each elastic protrusion portion, and the resin cover member covers the elastic protrusion portion to form a guide protrusion. In the elastic crawler, the resin cover member of the guide protrusion is put on the elastic protrusion portion to cover the surface of the elastic protrusion portion except a root portion 13r, and a reinforcing fiber part is embedded at least in the root portion of the elastic protrusion portion along a side face of the elastic protrusion portion.

Abstract: A rubber composition, contains a rubber component, a filler, and a resin, wherein: the rubber component contains natural rubber, a high-Tg modified styrene-butadiene rubber, and a low-Tg modified styrene-butadiene rubber having a lower glass transition temperature (Tg) than the high-Tg modified styrene-butadiene rubber; both ends of the high-Tg modified styrene-butadiene rubber have been modified and at least one end thereof has been modified with an alkoxysilane; one end of the low-Tg modified styrene-butadiene rubber has been modified with an alkoxysilane; and a mass ratio of the high-Tg modified styrene-butadiene rubber (high-Tg modified SBR) content with respect to the low-Tg modified styrene-butadiene rubber (low-Tg modified SBR) content, i.e., high-Tg modified SBR content/low-Tg modified SBR content, is larger than 1.

Abstract: Provided is a pneumatic tire including: a pair of bead cores embedded in a pair of bead portions; and a carcass including one or more carcass plies extending in a toroidal form between the pair of bead cores, wherein bead fillers are disposed on an outer side in a tire radial direction of the bead cores, rubber chafers are provided on an outer side in a tire width direction of the bead fillers, and when a storage modulus of the bead fillers is E1?, and a storage modulus of the rubber chafers is E2?, the ratio E2?/E1? satisfies 0.4?E2?/E1??1.

Abstract: A vulcanizable composition comprising rubber component, a filler, and a curing agent, where the rubber component includes a block copolymer of polybutadiene and polyisoprene, and where the block copolymer has a cis content of at least 90%.

Abstract: Provided is a pneumatic tire including: a pair of bead portions; and a carcass including one or more carcass plies of radially arranged cords that extend in a toroidal form between the pair of bead portions, wherein a reinforcing member is provided so as to extend at an angle with respect to a tire radial direction in an area including a tire maximum width position of the pneumatic tire that stretches in the tire radial direction on an outer side in a tire width direction of the carcass in a reference state.

Abstract: In a vehicle action simulation method according to the present invention, a behavior of an actual vehicle during travel is predicted, and an attitude of a tire and a rotational speed of a rotary drum are changed to reproduce a transient change in a tire attitude that occurs during the travel of the actual vehicle on the tire while the predicted behavior of the actual vehicle during travel is reflected, stress applied to the tire in contact with the rotary drum of a tire ground contact characteristic measuring portion is measured, tire ground contact characteristics are calculated, the behavior of the actual vehicle during travel is predicted while vehicle characteristics predicted from the tire ground contact characteristics are reflected, and the prediction, the reproduction, the measurement of stress, and the calculation are performed in parallel.

Abstract: A tire air pressure monitoring system includes: a data acquisition unit that acquires tire air pressure data at each fixed detection period; a storage unit that stores newly acquired air pressure data P(0), and air pressure data P(1) to P(N) acquired 1 to N periods prior to the air pressure data P(0); a determination unit that determines a state in which air pressure has decreased, on the basis of air pressure data; and a communication unit that transmits a determination result of the determination unit to an external device, in which the determination unit compares each piece of the air pressure data P(1) to P(n) with the air pressure data P(0) to calculate decrease values, compares the decrease values with a preset first threshold value (th1), and determines that tire air pressure is decreasing when at least one decrease value is greater than or equal to the first threshold value.

Abstract: A tire includes a circumferential direction groove and plural protrusions. The circumferential direction groove is formed in a tread face so as to open toward an outer side in a tire radial direction. The plural protrusions are formed so as to project to a projection height of from 0.1 mm to 1.0 mm from a groove bottom face or a groove side face of the circumferential direction groove, and are spaced apart by a spacing of from 0.1 mm to 1.0 mm. A center line MA, MB linking a center point of a leading end side with a center point of a base end side of each of the plural protrusions leans with respect to a perpendicular line HA, HB such that the leading end side of the protrusion is positioned further toward a tire rotation direction upstream side than the base end side of the protrusion when viewed along a tire width direction or the tire radial direction.