Sumitomo Rubber Industries Patente

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Provided are a method for manufacturing a rubber composition for a tire and a tire manufacturing method that allow good processability to be obtained also when a silane coupling agent having a mercapto group is blended. A method, for manufacturing a rubber composition, for a tire, which contains a rubber component (A) having at least two kinds of rubber components, a compound (B) represented by Formula (1), and a silane coupling agent (C) having a mercapto group, includes: a step X1 of kneading a first rubber component of the rubber component (A) and the compound (B); a step X2 of kneading the silane coupling agent (C) with a kneaded product obtained in the step X1; and a step X3 of kneading a second rubber component of the rubber component (A) with a kneaded product obtained in the step X2. In the method, the first rubber component has a lower activating ability with respect to a mercapto group than the second rubber component. The tire manufacturing method includes the method for manufacturing the rubber composition. (In the Formula, R 1 to R 4 each independently represent a predetermined group.)

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A tire comprises a tread portion 2. The tread portion 2 includes a tread ground contacting surface (2s) and at least one main groove 3 recessed from the tread ground contacting surface (2s) and extending continuously in a tire circumferential direction. The main groove 3 has a first groove wall 11. The first groove wall is provided with a recessed portion 15 recessed outwardly in a groove width direction from a groove edge of the main groove 3 on the tread ground contacting surface. The recessed portion 15 is formed of groove wall rubber 8 having a complex elastic modulus larger than that of base rubber 7 forming a main portion of the tread ground contacting surface (2s).

An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and a high spin rate on approach shots. The present invention provides a multi-piece golf ball comprising a center and n (n is a natural number of 3 or more) envelope layers covering the center, wherein material hardness of the envelop layers satisfies H1<H0<Hn-1; where the envelope layers formed in order from the center side are referred to as the first envelope layer, the second envelope layer, the third envelope layer, the fourth envelope layer, ...the n-1th envelope layer and the nth envelope layer (the outmost layer), respectively and H0 is a material hardness (Shore D hardness) of the center, and H1, H2, H3, H4, ...Hn-1 and Hn are material hardness (Shore D hardness) of the first envelope layer, the second envelope layer, the third envelope layer, the fourth envelope layer, ...the n-1th envelope layer and the nth envelope layer (the outmost layer), respectively ; and the center is formed from a thermoplastic resin composition, and the first envelope layer is formed from a thermoplastic resin composition or a rubber composition.

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Provided is a pneumatic tire having further improved abrasion resistance at the time when the road surface state is in a high severity region. A pneumatic tire including a tread formed from a rubber composition containing: carbon black; and a rubber component that contains not less than 50% by mass and less than 100% by mass of an isoprene-based rubber, and greater than 0% by mass and not greater than 50% by mass of a butadiene rubber, wherein a variation of modulus (M300 max -M300 min )×100/M300 max measured with respect to 10 pieces obtained from portions on an equator of a ground-contact surface of the pneumatic tire is not greater than 20%.

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In oder to provide a heavy-duty tire that allows wear resistance of a tread part to be improved while preventing an increase in rolling resistance, a heavy-duty tire (1) includes a tread part (2); in a tire cross section including a tire rotation axis in a 5% internal pressure state, a profile (20) of the tread part (2) includes a crown profile (21) and a pair of shoulder profiles (22) that respectively extend from both sides of the crown profile (21) to tread edges; the crown profile (21) and the shoulder profiles (22) each have an arc shape that is convex toward a tire radial direction outer side, the ratio (Rc/Rs) of a curvature radius (Rc) of the crown profile (21) to a curvature radius (Rs) of each of the shoulder profiles is 7.0; i.e. the ratio (Rs/Rc) is 0.143 or less; the tire axial direction distance (L1) from the tire equator (C) to the connecting point (23) is 0.70 or more times the tread half width (TWh).

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A motorcycle tire (2) for uneven terrain wherein in a radial direction, a radially outer edge (Pr) of an apex (26) of the tire (2) is located inward of a shoulder block (18s), an axially outer boundary edge between a main body outer surface (20) of a tread (4) and the shoulder block (18s) is denoted by Ps, a point of intersection between the main body outer surface (20) and a straight line (Le) that passes through an axially outer edge of a contact surface (22) of the shoulder block (18s) and extends perpendicularly to the contact surface (22) is denoted by Pe and the outer edge (Pr) of the apex (26) is located between the boundary edge Ps and the point of intersection Pe in the radial direction.

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A pneumatic tire is provided with a noise damper made of a sponge material attached to a radially inner surface of the tread portion. The noise damper has protruding portions protruding from a radially inner surface of a band-shaped base portion. The protruding portions extend from one edge to the other edge of the base portion in the widthwise direction, and arranged at intervals in the tire circumferential direction. In a cross section of the tire parallel with the tire equatorial plane, the radially inner surface of each of the protruding portions includes a flat portion, and the radially inner surface of the base portion includes an arc portion parallel with the inner surface of the tread portion.

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