Sumitomo Rubber Industries Patente

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A heavy-duty tire includes a tread portion (2) including a pair of tread edges (TE) and a tire equator (C) located therebetween. In a tire cross-section including a tire axis under a 5% inner pressure condition where the tire is mounted on a standard wheel rim with 5% of a standard pressure but is loaded with no tire load, the tread portion (2) has a profile which includes a first profile (21) including the tire equator, a pair of second profiles (22) extending axially inwardly from the tread edges (TE) and a pair of third profiles (23) connecting the first profile (21) and the respective second profiles (22). The first profile (21) and the second profiles (22) are configured as arc shapes protruding outwardly in a tire radial direction, and the third profiles (23) are configured as straight shapes.

A motorcycle tire is provided in the tread portion with first inclined main grooves and second inclined main grooves which are arranged alternately in the tire circumferential direction while inclining in opposite directions. The first inclined main grooves extend from a first tread edge toward a second tread edge across the tire equator and terminate at the respective second inclined main grooves which extend from the second tread edge toward the first tread edge across the tire equator and terminate at the respective first inclined main grooves which are respectively next to the above-said first inclined main grooves. A first region, which is delimited by the first tread edge, two of the first inclined main grooves and one of the second inclined main grooves, is provided with blocks whose ground contacting top surfaces have vertices each having an angle of not less than 45 degrees.

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An apparatus for vulcanizing a tire comprises: a side mold segment (15) provided with a face for shaping the outer surface of a tire sidewall portion, and an opposite face not serving for shaping(16); and a heater part (J1) for vulcanizing the raw tire. The heater part (J1) is disposed adjacently to the side mold segment to heat the raw tire abutting on the side-shaping-face from the side of the face not serving for shaping (16) . The side mold segment is provided with a flow path (18) through which a first fluid whose temperature is lower than the vulcanization temperature of the raw tire can flow to prevent over-vulcanization of the sidewall portion.

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Provided are surface-modified rubbers or surface-modified thermoplastic elastomers, such as catheters, syringe barrels, tubes of medical instruments, and mudguard fenders, and methods for modifying the surface of rubber or a thermoplastic elastomer, wherein a lubricant layer is firmly bonded to the surface of medical devices such as catheters, syringe barrels, and tubes of medical instruments to impart lubricity to the surface and, further, improve the durability of the lubricant layer on the surface, thereby suppressing deterioration of the sliding properties. Included is a surface-modified rubber or a surface-modified thermoplastic elastomer each having a surface at least partially treated by polymerization of a monomer in the presence of a thermal polymerization initiator.

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In a tire 2 according to the present invention, belt cords 42 included in a belt 22 each include a twisted string obtained by twisting together four filaments 46. Each belt cord 42 has an elliptical cross-section. On the cross-section, the ratio of the length of the minor axis to the length of the major axis is greater than or equal to 0.67 and not greater than 0.94. A first filament 46a and a third filament 46c are disposed along the minor axis. The first filament 46a and the third filament 46c are each in contact with a second filament 46b and a fourth filament 46d, or the first filament 46a is in contact with the third filament 46c.

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Uneven wear resistance at a tread pattern having tilted main grooves is improved.In a tire in which first and second tread pattern portions P1 and P2 provided at one side and another side with respect to a tire equator C have a relationship of point symmetry, each of the first and second tread pattern portions P1 and P2 has tilted main grooves 4 each having an outer end portion 4a connected to a shoulder main groove 3, extending toward the tire equator C while being tilted relative to a tire circumferential direction, and having an inner end portion 4b terminating without intersecting the tire equator C. A center sipe 5 having shallow portions 15 and a deep portion 16 penetrate between each tilted main groove 4 on the first tread pattern portion P1 and each tilted main groove 4 on the second tread pattern portion P2.

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