Sumitomo Rubber Industries Patente

Both outer appearance of a tire and efficiency for cleaning a vulcanization mold are improved.Provided is a tire 1 that includes a decorative pattern 7 formed on a surface 5 of a sidewall portion 3. The decorative pattern 7 is formed such that a plurality of ridges 11 that extend in a tire radial direction are aligned in a tire circumferential direction so as to form gaps 12. A transverse cross-section of each ridge 11 is tapered so as to gradually reduce a length L1 along the surface 5 such that the greater a distance from the surface 5 is, the less the length L1 along the surface 5 is. The decorative pattern 7 is structured so as to satisfy expressions (1) and (2),20≤A≤400.15≤C≤0.25wherein A represents a taper angle (degree) of the ridge 11, and C represents a minimum length (mm), of each gap 12, measured along the surface 5.

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A golf ball 2 includes a spherical core 4, an inner mid layer 6, an outer mid layer 8, a reinforcing layer 10, and a cover 12. When distances (%) from a central point of the core 4 to nine points and JIS-C hardnesses at the nine points, which nine points are obtained by dividing a region from the central point of the core 4 to a surface of the core 4 at intervals of 12.5% of a radius of the core 4, are plotted in a graph, R 2 of a linear approximation curve obtained by a least-square method is equal to or greater than 0.95. Hm1 is greater than Hm2. Hc is less than Hm1. T2 is equal to or greater than 0.5 mm but equal to or less than 1.6 mm.

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A tire comprises center blocks (4) comprising a first center lateral groove (5A) and a second center closed sipe (6a) opposed to each other in a tire axial direction, and a second center lateral groove (5B) and a first center closed sipe (6b) axially opposed to each other. Lengths thereof satisfy the followings: LA/LA0 ¤ 1/2, LB/LB0 ¤ 1/2, Lb/Lb0 in a range of from 1/3 to 2/3, La/La0 in a range of from 1/3 to 2/3, LA <La, (LA + La) <LA0, LB <Lb, and (LB + Lb) <LB0. The center blocks (4) comprise a high rigidity region extending continuously between penetrating sipes (3) and between a first imaginary line passing through terminating ends of the first center lateral groove and the first center closed sipe and a second imaginary line passing through terminating ends of the second center lateral groove and the second center closed sipe.

A tire capable of exhibiting excellent noise performance is provided. The tire includes a tread portion 2. At least one first groove 10 is provided on a ground-contact surface of the tread portion 2. The first groove 10 has a stepped shape in which lateral portions 15 extending in a tire axial direction and longitudinal portions 20 extending in a tire circumferential direction are alternately arranged in a longitudinal direction of the first groove 10. The number of the lateral portions 15 included in the first groove is at least three. The lateral portions 15 extend at an angle of 10° or less relative to the tire axial direction. The longitudinal portions 20 extend at an angle of 10° or less relative to the tire circumferential direction. The longitudinal portions 20 are not connected to any main groove continuously extending in the tire circumferential direction.

Provided is a studdable tire that can exhibit excellent on-snow performance as well as on-ice performance. A studdable tire 101 has a tread portion 102 to which a stud 103 is mounted. The tread portion 102 has a designated rotation direction R. The tread portion 102 includes a plurality of blocks 105. The plurality of blocks 105 each include a corner portion 106 that projects forward in the rotation direction R. The stud 103 is mounted to at least one of the plurality of blocks 105. The stud 103 includes a body embedded in the block 105 and a pin portion 120 that projects from the body in a tire radial direction. The body has a top flange 111 formed therein, and the top flange 111 includes a tapered portion 111A in a planar view. The stud 103 is mounted to the block 105 such that the tapered portion 111A and the corner portion 106 are oriented in the same direction.

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The present invention provides a method for producing a masterbatch and related products which enhance the dispersibility of fillers in rubber to improve the balance of tensile strength, rigidity, and fuel economy. Provided is a method for producing a masterbatch, including a step of mixing a rubber latex having a zeta potential of -100 to -20 mV with a filler dispersion having a zeta potential of 10 to 90 mV, and preparing a latex compound having a zeta potential of -20 to 0 mV.

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