Sumitomo Rubber Industries Patente

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Provided are a rubber composition, for a tire outer layer, that can improve low fuel consumption performance and ozone resistance in a balanced manner, and a pneumatic tire using the rubber composition. The rubber composition for the tire outer layer contains: a rubber component containing a butadiene rubber; a phenylenediamine antioxidant; and a surfactant having an HLB value of 5 to 12. The butadiene rubber contains a nitrogen atom and/or has a cis content of not greater than 60% by mass. An amount of the butadiene rubber in 100% by mass of the rubber component is 3 to 50% by mass. An amount of the phenylenediamine antioxidant is 1 to 10 parts by mass, an amount of the surfactant is 0.1 to 6 parts by mass, and an amount of carbon black is less than 25 parts by mass, per 100 parts by mass of the rubber component.

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A golf ball has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14. The minute projections 18 are exposed on the surface of the golf ball. The surface of the golf ball has an arithmetic average height Sa of not less than 0.5 µm and not greater than 30 µm. The surface of the golf ball has a maximum height Sz of not less than 5 µm and not greater than 200 µm.

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A tire includes a tread portion being provided with a pair of circumferentially and continuously extending shoulder main grooves and at least one crown main groove between the shoulder main grooves to form a pair of middle portions each of which is between adjacent one crown main groove and one shoulder main groove. Each of the middle portions is provided with a circumferentially and continuously extending longitudinal sipe, a plurality of inner middle sipes extending axially outwardly from the crown main groove and terminating without reaching the longitudinal sipe and a plurality of outer middle sipe extending axially inwardly from the shoulder main groove and terminating without reaching the longitudinal sipe. The number of the outer middle sipes is greater than the number of the inner middle sipes.

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A pneumatic tire having improved durability is provided. In the tire 2, in a state where no load is applied to the tire 2, when: a position at which a width of the tire 2 is at its maximum is referred to as reference position Pm 0 ; a straight line that passes through the reference position Pm 0 and extends in an axial direction is referred to as reference line M 0 ; a height from the reference position Pm 0 to an outer end of a tread 4 in a radial direction is denoted by Ht 0 ; and a reference line that is located outward of the reference line M 0 in the radial direction and extends in the axial direction and from which a distance to the reference line M 0 is 0.2 times of the height Ht 0 is denoted by L 0 , a radius of curvature Rp 0 of a circular arc Cp 0 that has a center Zp 0 on the reference line M 0 and passes through a point of intersection Pp 0 between the reference line M 0 and an outer surface of a carcass 12 and a point of intersection Pq 0 between the reference line L 0 and the outer surface of the carcass 12 is smaller than a distance Lp 0 between the center Zp 0 and an end of a first apex 32.

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Provided are a rubber composition that allows wear resistance and fuel economy performance to be improved in a well-balanced manner, and a pneumatic tire using the same.A rubber composition, for a tire, according to the present invention includes: a rubber component that contains a first styrene butadiene rubber having a weight-average molecular weight of not less than 1000000, a second styrene butadiene rubber having a weight-average molecular weight of not less than 100000 and not greater than 400000, and a butadiene rubber having a weight-average molecular weight of not less than 400000 and not greater than 1000000; a silica; a mercapto silane coupling agent; a sulfenamide-based vulcanization accelerator; a guanidine-based vulcanization accelerator; and a thiazole-based vulcanization accelerator.

A method for creating a 2D or 3D finite element model of a rubber composite of a rubber matrix and fillers are disclosed. The method comprises a first step in which a region of the rubber matrix and a plurality of regions of the fillers are defined in a predetermined 2D or 3D space; a second step in which the regions of the rubber matrix and fillers are divided into primary elements to form a primary finite element model, wherein the primary elements are triangular elements and optional quadrilateral elements when the space is two-dimensional or tetrahedral elements and optional hexahedron elements when the space is three-dimensional; and a third step in which each of the primary elements is subdivided into quadrilateral elements when the space is two-dimensional or hexahedron elements when the space is three-dimensional.

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A tire comprises a tread portion 2. The tread portion 2 is provided with at least one main groove 3 extending continuously in a tire circumferential direction. A first groove wall 10, which is one of groove walls of the main groove 3, is provided with at least one first recessed portion 11 recessed outwardly in a groove width direction from a corresponding one of groove edges 6 of the main groove on a ground contacting surface of the tread portion 2. In the first recessed portion 11, a recess amount from the corresponding one of the groove edges 6 gradually decreases toward both sides in the tire circumferential direction from a deepest portion 15 recessed most outwardly in the groove width direction.

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Provided are a rubber composition that allows wear resistance to be improved, and a pneumatic tire using the same.A rubber composition, for a tire, according to the present invention includes: a rubber component that contains a first styrene butadiene rubber having a weight-average molecular weight of not less than 1000000, a second styrene butadiene rubber having a weight-average molecular weight of not less than 100000 and not greater than 400000, and a butadiene rubber having a weight-average molecular weight of not less than 400000 and not greater than 1000000; an oil having an aromatic hydrocarbon content of not less than 20% by mass; a sulfenamide-based vulcanization accelerator; a guanidine-based vulcanization accelerator; and a thiazole-based vulcanization accelerator, and a content of the oil is not less than 10 parts by mass per 100 parts by mass of the rubber component.