Abstract: Provided are a rubber composition for injection molding with which it is possible to prevent scorching by ensuring the fluidity of the rubber composition needed for injection molding to suppress a temperature rise of the composition in an injection cylinder, without impairing the performance characteristics of a vulcanized product, as well as a golf ball using the rubber composition and its producing method. The rubber composition for injection molding includes a diene rubber, a crosslinking agent, an &agr;, &bgr;-unsaturated carboxylic acid and/or metal salt thereof, and &agr;, &bgr;-unsaturated carboxylic alkylester. The ratio of the total amount of the unsaturated carboxylic acid and the metal salt to the content of the alkylester ranges from 1.0 to 12.

Abstract: The present invention provides a three-piece golf ball which has an improved controllability at an approach shot while maintaining a long flight distance inherent to a solid golf ball. In the three-piece golf ball, the hardness, the specific gravity, and deformation amounts of the center and the core are determined in consideration of the relationship between each other.

Abstract: The present invention provides a solid golf ball which has an improved flying distance, controllability and shot feeling. The solid golf ball has a core and a cover. The core has a hardness of 55 to 75 at a center thereof and a hardness on a surface thereof that is greater than the hardness at the center by 10 or more. The cover has a hardness satisfying the following expressions (1) and (2): (hardness of the cover)−(hardness at the center of the core)≦17  (1), (hardness of the cover)−(hardness on the surface of the core)≦5  (2). The hardness being defined in terms of JIS-C scale hardness meter.

Abstract: A pneumatic radial tire having in axial cross-section a highly curved tread is reinforced by a breaker assembly with improved resistance to breaker edge looseness. The breaker assembly includes one breaker ply which extends between two bead regions and has its edges disposed between a carcass main portion and a carcass turn-up portion. An improved single-stage method may be employed for building the tire.

Abstract: A method is furnished for producing a compressible layer for a printing blanket by heating a sheet-shaped intermediate layer of a rubber composition having a structure in which hollow microspheres are dispersed in matrix rubber for one to fifty minutes under certain defined conditions of vulcanizing pressure and temperature using a vulcanizer for applying heat and pressure in direct contact with the intermediate layer. The produced compressible layer exhibits superior compressibility and durability, is uniform in thickness and internal structure, and does not reduce the productivity of the printing blanket and increase the fabrication cost of the printing blanket.

Abstract: The present invention provides a coating material for a golf ball. The coating material comprises a polyol(1) containing a urethane polyol and a polyisocyanate. The urethane polyol is produced by the reaction between a diisocyanate and a polyol(2) containing as an essential ingredient a diol and a triol at the triol/diol equivalent ratio of 0.2 to 3. The urethane polyol has Mw of 4000 to less than 10000. The coating material is dryable in a short time at low temperatures and forms a coating layer having excellent resistance to scuffing and adhesion to a golf ball main body.

Abstract: A tire of which tread rubber comprises a conducive rubber at least partially, the conducive rubber extending from the radially inner surface of the tread rubber to the ground contacting face, and the conducive rubber compounded from 100 parts by weight of diene rubber and 2 to 30 parts by weight of conductive short fibers, the conductive short fibers formed by coating reinforcing short fibers with a conductive substance, and the conductive rubber has a volume resistance of less than 1×108 ohm cm.

Abstract: The present invention provide a golf ball which can improve the mold releasing property in a press molding to ensure an increased productivity without decreasing a flight performance and durability. The golf ball has a part including a vulcanized rubber composition. The vulcanized rubber composition includes 100 parts by weight of a base rubber and 100 parts by weight or less of unsaturated carboxylic acid compounds. The unsaturated carboxylic acid compounds includes Component (A) of magnesium (meth) acrylate, and Component (B) of &agr;, &bgr;-unsaturated carboxylic alkyl ester. The content ratio of the Component (A) to the Component (B) (A/B) is 0.2 to 4.

Abstract: A tire for a two-wheeled vehicle comprising a ground contacting tread having at least one tread groove formed therein and extending axially from the tread center to the tread edge, wherein in a first region of the tire tread, which is the central tread region and is the region of contact between the tire and the ground when the motorcycle is in the condition of moving in a straight line, the alignment of the tread groove is substantially circumferential, and in a second region of the tire tread, which is at the axial edge of the tread and is the region of contact when the motorcycle is in the condition of turning under maximum cornering, the alignment of the tread grooves is substantially transverse, and in a third region, which is the tread region between the first central region and the second axial region and which is the ground contacting region when the motorcycle is turning at less than the maximum cornering condition, the groove alignment changes progressively axially outwardly from substantially circu

Abstract: A tire for a vehicle having at least one wheel at each corner, the tire comprising a ground contacting tread extending axially between first and second edge regions and having tread grooves formed therein, wherein in the first axial edge region of the tread the tread grooves are aligned substantially in the tire circumferential direction and in the second axial edge region of the tread the grooves are aligned substantially in the tire axial direction and in a third axial region of the tread axially between the first and second edge regions the alignment of the grooves changes progressively from circumferential to axial.

Abstract: A tread rubber composition of excellent hydrophobic property and water repellency suitable to a studless tire of excellent performance on ice, comprising a diene rubber comprising at least one rubber selected from the group consisting of natural rubber, isoprene and polybutadiene as a main ingredient and, based on 100 parts by weight of the diene rubber, from 10 to 40 parts by weight of a clay comprising kaolinite as a main ingredient and having an oil absorption amount of from 50 to 70 g/100 g and 0.1 to 8 parts by weight of a silane coupling agent.

Abstract: The present invention provides a rubber composition for a golf ball, including: 100 parts by weight of a base rubber which is a mixture of polybutadiene (A) having Mooney viscosity of 40 to 65 and polybutadiene (B) having Mooney viscosity of 20 to 35, a weight ratio the polybutadiene (A)/the polybutadiene (B) being 40/60 to 90/10; and 5 to 60 parts by weight of vulcanized rubber powder. The polybutadiene (A) and the polybutadiene (B) respectively includes 40 or more percent of cis-1,4 bonds.

Abstract: A radial motorcycle tire having improved lateral grip under camber with good stability, wherein the tread is reinforced by two main breaker plies comprising parallel reinforcing cords oppositely inclined with respect to the tire circumferential direction and a supplementary breaker ply is disposed radially outward of the main breaker plies and comprises a cord reinforced central ply portion and lateral outer side ply portions disposed on opposite sides of the central ply portion, said lateral side portions comprising rubber having no cord reinforcement.

Abstract: A golf ball includes a core and a cover which covers the core, wherein a ratio between the primary natural frequency (CF.sub.1) of the core and the primary natural frequency (BF.sub.1) of the golf ball satisfies a following mathematical relation:0.30.ltoreq.CF.sub.1 /BF.sub.1 .ltoreq.0.

Abstract: A pneumatic tubeless tire comprising a carcass ply of reinforcing cords extending between two tire bead regions through sidewall regions and a tread region and an innerliner disposed radially inwardly of the carcass ply is herein described. Between the sidewall region and the tread region is a tire shoulder region. In each of these shoulder regions, there is a circumferentially extending ply support strip disposed radially between the carcass ply and the innerliner. The ply support strip comprises a rubber compound containing short discontinuous fibrillated aramid fibers in an amount of between 7 and 15 parts by weight per 100 parts by weight of rubber.

Abstract: A sensor is provided for detecting rotations of a pneumatic tire on a vehicle comprising two spaced apart mounting points for attachment to the radially inner surface of the tire tread region, a contact member between the mounting points for contacting the inner surface of the tread radius of the tire between the two mounting points and signal producing means comprising a piezo-electric device which is adapted to produce a signal when the contact member is moved radially of the tire relative to the two mounting points wherein damping means are provided so that a signal is generated when the movement occurs rapidly but slow movement generates no signal so that on rotation of the tire on a vehicle a signal is produced each time the tread region to which the sensor is attached becomes changed in radius at the contact patch of the tire but when the tread radius changes slowly when there is a pressure change in the tire and the movement is slow no signal is produced.

Abstract: The present invention provides a coating material for golf ball. The coating material comprises: polyol containing urethane polyol as a chief material; and polyisocyanate as a curing agent. An equivalent ratio of isocyanate groups of the polyisocyanate with respect to hydroxyl groups of the polyol is 0.5 to 2.0. The urethane polyol has a hydroxyl value of 55 to 130 mgKOH/g, and weight-average molecular weight of 4000 to 9000.

Abstract: A tire building apparatus includes a tire building drum for pulling and holding a tire component on the outer circumference thereof. The tire building drum is formed with a plurality of suction portions for pulling the tire component to the tire building drum, and a pitch of a pair of adjacent suction portions in the circumferential direction is set different from a pitch of another pair of adjacent suction portions in the circumferential direction of the tire building drum.

Abstract: A pneumatic radial tire has a carcass extending around the tire from bead-to-bead, sidewalls and a rubber tread region which has a profile, when considered in transverse cross section, of a new tire terminating at the sides of the tread in inner and outer shoulder regions, respectively, each shoulder region having a shoulder drop, which is the distance, in the radially inward direction, from the point of maximum tire diameter to a point of the shoulder at the edge of the shoulder region, such that when the tire is mounted on a scheduled wheel rim and inflated to a scheduled pressure, the tread region is asymmetric, having its point of maximum tire diameter offset in the axial direction of the tire from the center line of the tire section in the direction of the inner shoulder, and the shoulder drop of the outer shoulder is greater than the shoulder drop of the inner shoulder such that the tread region has an asymmetric profile, wherein the tread region has a substantially constant tread gauge or thickness exc