60results about How to "Improve rolling resistance performance" patented technology

Provided are a method for producing a modified conjugated diene polymer / copolymer including a modified reaction step for causing an organosilane compound having a characteristic group for producing a silanol group by hydrolysis and, in the vicinity of the characteristic group, (i) a functional group for combining the organosilane compound with the conjugated dione polymer / copolymer by performing an addition or substitutive reaction on an active site and, after the reaction, prompting a reaction between the silanol group and a reinforcing filler or (ii) a functional group for prompting the reaction between the silanol group and the reinforcing filler to react with the active site of a conjugated dione polymer / copolymer having the active site, and a hydrosis step performed after completing the modified reaction step; a modified conjugated diene polymer / copolymer having, at an end of a molecular of a conjugated diene polymer / copolymer, a silanol group and, in the vicinity of the silanol group, a functional group for prompting a reaction between the silanolgroup and a reinforcing filler; and a rubber composition having the modified conjugated polymer / copolymer and carbon black of a specific property; and a tier using the rubber composition.

There is provided a rubber composition capable of producing a tire which improves rolling resistance performance, wet skid performance and drivability of a vehicle in good balance, and a tire having a tread comprising thereof. A rubber composition comprising 30 to 150 parts by weight of the total of (1) silica with a nitrogen adsorption specific area of 100 m 2 / g or less and (2) silica with a nitrogen adsorption specific area of 180 m 2 / g or more based on 100 parts by weight of a rubber component, wherein the content of silica (1) and silica (2) satisfies the following formula, and a tire having a tread comprising thereof: [ Content of silica ( 1 ) ] 0.2 [ content of silica ( 2 ) ] [ content of silica ( 1 ) ] 6.5.

Tire (1) comprising two beads (4), two sidewalls (3) connected to the beads and a crown (2) connected to the ends of the two sidewalls, the crown comprising a crown reinforcement (6) and a tread (5) radially on the outside of the crown reinforcement (6), said tread (7) comprising a plurality of tread blocks (71), at least two radially superposed layers: a sub-layer (7S) covering the crown reinforcement (6) and a main layer (7P) radially on top of the crown reinforcement (6), the sub-layer comprising a plurality of circumferential reinforcing elements (73) made up of a rubber compound of a rigidity that is higher than the rigidity of the rubber compound of the rest of the sub-layer, the circumferential reinforcing elements (73) extending radially from the radially exterior surface of said crown reinforcement (6) toward the interface between the sub-layer (7S) and the main layer (7P), said circumferential reinforcing elements having axial width that decreases progressively in a radiallyoutwards direction.

The present invention provides a rubber composition for a tread, which is friendly to the global environment and can prepare for the decrease in oil supply in the future because of its high content of non-fossil resources, as well as shows an excellent running performance (braking performance) on a wet road surface and a dry road surface, and has an improved abrasion resistance. The present invention also provides a pneumatic tire in which the rubber composition for a tread is used for a tread of the tire. The rubber composition for a tread of the present invention includes a rubber component containing butadiene rubber and 35% by mass or more of epoxidized natural rubber, and a white filler.

To improve durability performance and rolling resistance performance in a well-balanced manner. It is a tire for heavy loads including a carcass ply (6A). A sidewall rubber (3G) includes an inside rubber part (15) on the carcass (6) side, and an outside rubber part (16) disposed on the outside thereof and forming a tire outer surface. The inside rubber part (15) has a loss tangent tan δ1 less than the outside rubber part (16), and their difference is 0.010 to 0.035. The inside rubber part (15) has a complex elastic modulus less than the outside rubber part (16), their difference is 0.5 to 1.4 (MPa). The outer end (15s) in the tire radial direction of the inside rubber part (15) contacts with the outer surface (2h) in the tire axial direction of the tread rubber (2G), and the inner end (15u) in the tire radial direction is disposed radially inside the outer end (6e) in the tire radial direction of the turned up portion (6b) of the carcass ply (6A).