Sumitomo Rubber Industries Patente

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Provided is a pneumatic tire that allows ride comfort to be improved while enhancing steering stability. A pneumatic tire 1 includes: a carcass 6 that extends from a tread portion 2 through sidewall portions 3 to bead portions 4; and annular bead cores 5 disposed in the bead portions 4. The carcass 6 is turned up along inner circumferential portions of the bead cores 5. Each bead core 5 includes a wire 50 that is wound in a tire circumferential direction. In the pneumatic tire 1 in a normal state, an outer end 5o, in a tire radial direction, of the bead core 5 is positioned tire-radially inward of an outer end Fo, in the tire radial direction, of a flange F. The wire 50 is structured so as to have a plurality of filaments twisted. The number of times the wire 50 is wound in the tire radial direction into a stacked state is greater than or equal to 1.5 times the number of rows of the wire 50 in the tire axial direction.

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Provided are surface treatment agents that enable surfaces with a chemically fixed lubricant to be produced instead of a resin coating which has drawbacks, such as that lubricity is reduced due to separation, peeling or the like of the coating during the movement within a vessel or tube; and medical devices, such as catheters, having a surface at least partially treated with such a surface treatment agent. The present invention relates to a surface treatment agent for medical devices which contains a copolymer of a hydrophilic functional group-containing monomer and an epoxy group-containing monomer.

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Provided are: a rubber composition, for a tread, that has improved wet grip performance and abrasion resistance; and a pneumatic tire having a tread formed from the rubber composition for a tread. The rubber composition for a tread contains diene-based rubber and aluminum hydroxide having an average particle diameter (D50) of 0.6 to 1.3 µm and containing 10% by mass or greater of particles having a particle diameter not less than 3.0 µm.

The present invention provides a rubber composition for treads, containing: a rubber component including an isoprene-based rubber and polybutadiene rubber; silica; carbon black; a terpene-based resin; and a water-soluble fine particle and/or a foaming agent, the terpene-based resin having a softening point of 70-150 °C, an α-pinene unit content of 65-100% by mass, and a β-pinene unit content of 0-35% by mass, the rubber component including, based on 100% by mass thereof, 20-80% by mass of the isoprene-based rubber and 20-80% by mass of the polybutadiene rubber, with a combined amount of the isoprene-based rubber and the polybutadiene rubber of 90% by mass or more, the rubber composition containing, per 100 parts by mass of the rubber component, 20-200 parts by mass of the silica, 0.1-50 parts by mass of the carbon black, and 0.1-50 parts by mass of the terpene-based resin.

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A tyre includes a tread portion including an outboard middle land portion disposed between an outboard tread edge and a tyre equator. The outboard middle land portion includes first and second longitudinal edges, outboard middle lateral grooves extending from the first longitudinal edge and having terminal ends within the outboard middle land portion, first outboard middle sipes extending from the respective terminal ends of the outboard middle lateral grooves to the second longitudinal edge, and second outboard middle sipes extending from the first longitudinal edge toward the second longitudinal edge beyond the terminal ends of the outboard middle lateral grooves and terminating within the outboard middle land portion. The outboard middle land portion is not provided with any lateral grooves that extend from the second longitudinal edge toward the first longitudinal edge to reach an axial center location of the outboard middle land portion.

A tyre (1) includes a tread portion (2) provided with an outer main groove (3A), an inner main groove (3B), and a middle main groove (3C). Each of the main grooves has a pair of groove edges arranged on both sides in a tyre axial direction and extending in a tyre circumferential direction. At least one of the groove edges includes circumferential portions (6) extending in the tyre circumferential direction and axial portions (7) inclined at larger angles than the circumferential portions (6) with respect to the tyre circumferential direction. When an axial portion total length is a sum of axial lengths of the axial portions included in the main grooves (3A, 3B, 3C), an axial portion total lengths L1, L2, and L3 of the outer main groove 3A, the middle main groove 3C, and the inner main groove 3B, respectively, satisfy Expressions (1) and (2) shown below:

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A tyre includes a tread portion having an outer shoulder main groove, a crown main groove, and an outer middle land region defined between the outer shoulder main groove and the crown main groove. The outer middle land region is provided with first middle sipes each extending inwardly in a tyre axial direction from the outer shoulder main groove to have an inner end in the outer middle land region and second middle sipes each extending outwardly in the tyre axial direction from the crown main groove to have an outer end in the outer middle land region. The number of the second middle sipes is larger than the number of the first middle sipes.

A tyre has a tread portion. The tread portion has a land region divided by a first edge and a second edge extending in a tyre circumferential direction. The land region is provided with a plurality of sipes each extending between the first edge and the second edge. The plurality of the sipes includes inclined sipes and bent sipes. Each of the bent sipes includes first inclined elements inclined in the first direction with respect to the tyre axial direction and a second inclined element inclined in a direction opposite to the first inclined elements with respect to the tyre axial direction. Each of the inclined sipes is configured to have a depth larger at a center portion thereof than at both end portions thereof. Each of the bent sipes is configured to have a depth smaller at a center portion thereof than at both end portions thereof.

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A tyre includes a tread portion including a tread surface which is provided with grooves. At least one of the grooves includes a widening-width portion at least partially. The widening-width portion includes a first groove portion extending inwardly in a tyre radial direction from the tread surface, and a second groove portion located inwardly in the tyre radial direction of the first groove portion and having a groove width greater than that of the first groove portion.