Sumitomo Rubber Industries Patente

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A heavy duty tire 2 includes a tread 4. The tread 4 includes a crown circumferential main groove 14 and shoulder circumferential main grooves 12. The tread 4 includes crown land portions 20 and shoulder land portions 22. Each crown land portion 20 has a crown narrow groove 24. Each crown land portion 20 has crown narrow land portions 34. Each crown narrow land portion 34 has crown sipes 40 shallower than the crown circumferential main groove 14 and the crown narrow groove 24. The crown narrow groove 24 includes a body portion main body 32 and an enlarged width portion 28. A locus LB of a groove bottom 12T in each shoulder circumferential main groove 12 includes inner peaks LBu and outer peaks LBs, and extends in a zigzag manner while passing through the inner peaks LBu and the outer peaks LBs alternately in a circumferential direction.

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A method for producing a retreaded tire 2 includes a step of shaving a tread 104 from a tire 102, a step of attaching a tag member 30 to a formed surface BD made by shaving the tread 104, and a step of reconstructing a new tread 4. The formed surface BD is located radially outward of a maximum width position of the tire 2. The tag member 30 is located radially inward of an end of a belt 14. An initial vulcanization time t10 of a rubber composition for a protector 34 of the tag member 30 is shorter than an initial vulcanization time 110 of a rubber composition for the new tread 4.

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Provided is a tire comprising a tire member composed of a rubber composition, the rubber composition comprising a rubber component, a filler, and a plasticizer, the rubber component comprising an isoprene-based rubber and a styrene-butadiene rubber, the isoprene-based rubber comprising an epoxidized isoprene-based rubber, wherein N/t is less than 2.2, where N represents a total content, in % by mass, of isoprene-based rubbers in the rubber component and t represents a thickness, in mm, of the tire member.

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An aqueous adhesive for rubber of the present disclosure includes: a base agent containing rubber latex as a main component thereof; and an organic solvent that causes swelling of a rubber component in the rubber latex. An amount of the organic solvent in the aqueous adhesive for rubber is not less than 25% by mass and not greater than 60% by mass of a total amount of the base agent and the organic solvent. A boiling point of the organic solvent is preferably not higher than 140°C. A tennis ball of the present disclosure includes a hollow core made of a rubber material. The hollow core includes two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for rubber.

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The aqueous adhesive for a tennis ball includes rubber latex. The rubber latex is a mixture of liquid rubber latex and solid rubber latex. A ratio of liquid rubber to an entire rubber component contained in the rubber latex is greater than 20% by weight and less than 90% by weight in terms of solid content. The tennis ball includes a seam formed of the aqueous adhesive for a tennis ball.

An object of the present disclosure is to provide a golf ball having excellent flight distance on driver shots and good spin rate on middle iron shots. The present disclosure provides a golf ball comprising a spherical core and a cover, wherein a hardness difference (C1-C0), a hardness difference (C2-C1), a hardness difference (C3-C2) and a hardness difference (C4-C3) are more than 0 and 6.0 or less, a hardness difference (C5-C4) is 5.0 or more, and a hardness difference (C6-C5), a hardness difference (C7-C6) and a hardness difference (C8-C7) are more than 0 and 3.5 or less where C0 (center), C1, C2, C3, C4, C5, C6, C7 and C8 (surface) are a Shore C hardness at each point from the center obtained by dividing a radius of the spherical core into equal eight parts

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It is an object of the present invention to provide a tire having improved overall performance of high-speed turning performance and fuel efficiency. Provided is a tire having a tread part (4) and a belt layer (3), wherein a rubber composition of the tread part comprises a rubber component and a thermoplastic elastomer, wherein the rubber component comprises a multicomponent copolymer having an aromatic vinyl unit and a conjugated diene unit, wherein the thermoplastic elastomer comprises a styrene-based thermoplastic elastomer having an alkylene unit, wherein, when Y is defined in the following equation with Wt, in mm, being a cross-sectional width of the tire and B, in mm, being a belt layer width of the tire under a condition that a tread of the tire in a standardized state is pressed against a flat surface by applying a standardized load, Y=(B-16)/Wt, Y is 0.75 or less, and wherein a ratio (X/Y) of a total content X, in part(s) by mass, of the thermoplastic elastomer based on 100 parts by mass of the rubber component to Y is 3.0 or more.

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Provided is a pneumatic tire having improved noise performance by reducing pass-by noise. A pneumatic tire 1 includes a belt layer 7. The belt layer 7 is composed of two belt plies 7A, 7B. Each of the belt plies 7A, 7B includes a plurality of steel cords 12 and a topping rubber 13, and has a thickness TP of 0.65 to 0.85 (mm). Each steel cord 12 has a strength of 400 to 540 (N). The number of the steel cords 12 per width of 5 (cm) in a direction orthogonal to a longitudinal direction of the steel cords 12 is 40 to 50. The steel cord 12 has an outer diameter of 0.36 to 0.42 (mm). 0.09≤TP×2/TA+TH/2≤0.14TA: tread portion thickness (mm) at the position of a tire equator CTH: tread portion thickness (mm) at the position of each of ground-contact ends Te

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