Toyo Tire Patente

The invention relates to a rubber composition comprising a diene-based rubber, graphene and optionally silica, wherein the graphene is graphene having a specific surface area of 200 m²/g or less, a particle size of 10 µm or less, an average thickness of particles of 10 nm or less, and an oxygen content of 1% by mass or less.The invention also relates to a pneumatic tire comprising a vulcanized rubber of the rubber composition defined above.

A rubber composition for tire treads or tire sidewalls, comprising a diene-based rubber, a filler, a vulcanizing agent, an antiaging agent, and graphene nanoplatelets, wherein the antiaging agent contains at least an amine-ketone-based antiaging agent, and a content of the graphene nanoplatelets is 1 to 10 parts by mass when a total amount of the diene-based rubber is taken as 100 parts by mass. It is preferred that in the rubber composition for tire treads or tire sidewalls, the rubber composition does not contain (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine).

A rubber composition for tire treads or tire sidewalls comprising a diene-based rubber, a filler, a vulcanizing agent, an antiaging agent, and a graphene powder, wherein the antiaging agent contains at least an amine-ketone-based antiaging agent, and a content of the graphene powder is 1 to 10 parts by mass when the total amount of the diene-based rubber is taken as 100 parts by mass. It is preferred that in the rubber composition for tire treads or tire sidewalls, the rubber composition does not contain (N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine).

A rubber composition for tire sidewalls or rubber composition for tire treads comprising a diene-based rubber, a filler, a vulcanizing agent, an antiaging agent, and a graphene powder, wherein the antiaging agent contains at least an amine-ketone-based antiaging agent and N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, and when a content of N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine and a content of the graphene powder per 100 parts by mass of a total amount of the diene-based rubber are respectively defined as X and Y, 1.5 ≤ X + Y ≤ 10, and X : Y is 1 : 3 to 3 : 1 are satisfied.

[Problem to be solved] To provide a pneumatic tire including bridges capable of effectively reducing the likelihood that blocks collapse. [Solution] A tire 1 has a tread 2 including first bridges 61 provided in first main grooves 21. Each first bridge 61 couples a rear first center block 311 to a front first center block 312, each first bridge 61 being connected to an end portion 331 of a first edge 33 of the rear first center block 311, the end portion 331 being located closer to a tire equator S1 in a direction in which the first main groove 21 extends, and each first bridge 61 being connected to an intermediate portion 341 of a second edge 34 of the front first center block 312, the intermediate portion 341 being located intermediately in the direction in which the first main groove 21 extends.

A pneumatic tire (1) comprising a tread (10) is provided. The tread (10) includes a pair of shoulder main grooves (23,24), and a shoulder land portion (60,70) placed outward of the shoulder main grooves (23,24) in a tire axial direction. The shoulder land portion (60,70) includes a shoulder sub groove (61) extending along a tire circumferential direction and having a width smaller than a width of the shoulder main groove (23,24), and a shoulder slit (62) extending outward from the shoulder sub groove (61) in the tire axial direction.

A pneumatic tire includes a tread (2). The tread (2) includes a pair of shoulder main grooves (12,13), and shoulder ribs (50,60) disposed further outward in the tire axial direction relative to the shoulder main grooves (12,13), respectively. Each of the shoulder ribs (50,60) includes a slit (51,61) that extends in a direction intersecting the shoulder main grooves (12,13) and terminates within the shoulder rib (50, 60). The slit (51, 61) has an inward end (51A, 61A) in the tire axial direction, and the inward end (51A, 61A) is disposed further inward in the tire axial direction relative to a contact end (E1, E2) of the tread (2). The tread (2) includes a contact patch having a rectangle ratio A of 0.6 or more and 0.7 or less.

A pneumatic tire includes a tread (2). The pneumatic tire further includes a carcass and a belt. The tread (2) includes a pair of shoulder main grooves (12, 13) and shoulder ribs (50, 60) disposed further outward in the tire axial direction relative to the shoulder main grooves (12, 13), respectively. Each of the shoulder ribs (50, 60) includes a slit (51, 61) that extends in a direction intersecting the shoulder main grooves (12, 13) and terminates within the shoulder rib (50, 60). The slit (51, 61) has an inward end in the tire axial direction, and the inward end is disposed further inward in the tire axial direction relative to a contact end (E1, E2) of the tread (2). A ratio (D/W) of a length D [mm] of the belt in a tire axial direction with respect to a contact width W[mm] of the tread is less than 1.1.

A pneumatic tire (10) which reduces vehicle exterior noise is provided. A pneumatic tire (10) according to the present disclosure has a plurality of primary grooves (11, 12, 13, 14), and has a direction of equipping on a vehicle body designated. In a ground-contacting region which contacts a flat road surface when a load of 85% of a regular load (maximum load capacity) at a regular internal pressure is applied in a state in which the pneumatic tire (10) is equipped on a regular rim and air is filled to achieve the regular internal pressure; a length L1 in a circumferential direction at a position which is 1/10<th> of a tire ground-contacting width toward a vehicle interior side from a ground-contacting end (E1, E2) on a vehicle exterior side, and a length L2 in the circumferential direction at a tire equator (CL) satisfy a relationship of (L1/L2) ≤ 0.7; and a cross-sectional area of an outer primary groove (11), which is a primary groove positioned at an outermost position on the vehicle exterior side among the plurality of primary grooves (11, 12, 13, 14), is smaller than cross-sectional areas of the plurality of primary grooves (12, 13, 14) other than the outer primary groove (11).

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A pneumatic tire having improved traction performance is provided. A pneumatic tire according to an embodiment has a tread (10) and has a designated direction of rotation. The tread (10) includes a main groove (20, 21) which extends from a side of an equator (CL) toward a side of a ground-contacting end (E1, E2), and which has an inclination with respect to a tire axial direction which is larger on the side of the equator (CL) than the side of the ground-contacting end (E1, E2), and a block (30, 31) which is formed along the main groove (20, 21) and which is placed alternately with the main groove (20, 21) in a tire circumferential direction. On the block (30, 31), an inclined surface (60, 61, 62, 63) which is inclined with respect to an upper surface of the block is formed on a side wall on a front side in a tire rotational direction, among side walls along the main groove (20, 21).

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A pneumatic tire is provided for which blocks arranged in a region of the shoulder are unlikely to be damaged, and thus is able to secure running stability on snowy road surfaces. A shoulder block (60) has at least one shoulder sipe (110) having a wavy shape in a tire surface view, and extending in a direction which intersects in a tire-circumferential direction. A central block (70) has at least one central sipe (120) having a wavy shape in a tire surface view, and extending in a direction which intersects in a tire-circumferential direction. An intermediate block (80) has at least one intermediate sipe (130) having a wavy shape in a tire surface view, and extending in a direction which intersects in a tire-circumferential direction. A relationship of Ceθ > Shθ > Meθ is established where ShA is amplitude in a tire surface of the shoulder sipe (110), CeA is amplitude in a tire surface of the central sipe (120), and MeA is amplitude in a tire surface of the intermediate sipe (130).

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A rubber composition for a base tread according to an embodiment includes a rubber component containing 70 mass% or more of natural rubber, a first filler that is carbon black having an N₂SA of less than 60 m²/g, a second filler that is carbon black having an N₂SA of 60 m²/g or more and/or silica, sulfur, and a sulfenamide-based vulcanization accelerator. Per 100 parts by mass of the rubber component, the amount of the first filler is 10 to 45 parts by mass, the amount of the second filler is 15 to 30 parts by mass, the total amount of the first filler and the second filler is 35 to 60 parts by mass, the amount of the sulfur is 1.6 to 3.0 parts by mass, and the amount of the sulfenamide-based vulcanization accelerator is 1.6 to 3.0 parts by mass.

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The sealant composition according to an embodiment includes, per 100 parts by mass of a solid rubber component containing 60 parts by mass or more of natural rubber: 95 to 150 parts by mass of a hydrocarbon resin containing 30 parts by mass or more of a terpene-based resin; and 20 to 100 parts by mass of a liquid plasticizer.

The rubber composition for a tire tread according to the embodiment contains a rubber component containing a diene rubber and vegetable granules having a surface treated with a sulfonic acid-type surfactant.

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In order to improve steering stability at the time of turning while ensuring good fuel efficiency, there is provided a tire tread rubber composition including a rubber component containing styrene-butadiene-based rubber and isoprene-based rubber, wherein the hardness Hs at 23 °C is 55 or greater and 62 or less, and the hardness Hs at 23 °C and the loss tangent tan δ at 35 °C satisfy the following formula: 0.240 ≤ tan δ/Hs × 100 ≤ 0.320. There is also provided a tire having a tread composed of this tire tread rubber composition.

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Provided is a pneumatic tire (10) having a tread (20) including a block (30) in which a waveform sipe (41) is formed. The waveform sipe (41) is formed such that the pitch (P) increases and the amplitude (A) decreases from a block surface side to a block bottom side. The pitch (P) increases towards end sides the block (30) with respect to a center of the block (30) in a tire axial direction (W).