Abstract: Golf balls including a spherical inner core shell layer formed from a thermoset or thermoplastic composition are provided. The shell layer has an outer surface, an inner surface, and an inner diameter to define a hollow center. A thermoset or thermoplastic outer core layer is formed about the shell layer and optional intermediate layer(s) disposed between the shell layer and the outer core layer. A cover is formed about the outer core layer.

Abstract: A thermoplastic multi-layer golf ball has a core center having a shell from about 1-6 mm thick defining an interior space about 12-24 mm in diameter, a core layer at least about 5 mm thick outward from the core center, and a cover. The shell includes a first thermoplastic material with first flexural modulus less than about 15,000 psi. The core layer includes a second thermoplastic material with second flexural modulus up to about 15,000 psi and greater than the first flexural modulus and a specific gravity of at least about 1.5 g/cm3. The cover includes a third thermoplastic material with a third flexural modulus that in a first embodiment is up to about 5,000 psi and less than the first flexural modulus and in a second embodiment is least about 40,000 psi.

Abstract: A hollow golf ball includes a spherical inner core shell layer formed from a first thermoplastic composition, the shell layer having an outer surface, an inner surface, and an inner diameter to define a hollow center. An outer core layer is formed about the shell layer and includes a thermoset rubber composition. An inner cover layer is formed about the outer core layer and includes an ionomeric material. An outer cover layer is formed about the inner cover layer. The outer cover includes a polyurea or a polyurethane and has a hardness less than the inner cover layer. The hollow center has a diameter of about 0.15 to 1.1 inches, the shell layer has a surface hardness greater than an inner surface hardness by about 0 to 5 Shore C to define a first hardness gradient, and the thermoset outer core layer has a second hardness gradient.

Abstract: A golf ball includes a thermoset spherical inner core shell layer having an outer surface, an inner surface, and an inner diameter to define a hollow center; a thermoset outer core layer formed about the shell layer; and an inner and outer cover layer formed about the outer core layer. The inner cover includes an ionomeric material and the outer cover layer includes a polyurea or a polyurethane having a hardness less than the inner cover layer. The hollow center has a diameter of about 0.51 to 1.1 inches, the shell layer has a surface hardness greater than an inner surface hardness by about 3 to 25 Shore C to define a first hardness gradient, and the outer core layer has a second hardness gradient different from the first.

Abstract: Golf balls including a spherical inner core shell layer formed from a thermoset or thermoplastic composition are provided. The shell layer has an outer surface, an inner surface, and an inner diameter to define a hollow center. A thermoset or thermoplastic outer core layer is formed about the shell layer and optional intermediate layer(s) disposed between the shell layer and the outer core layer. A cover is formed about the outer core layer.

Abstract: A golf ball including a spherical inner core shell layer formed from a thermoset rubber composition, the shell layer having an outer surface, an inner surface, and an inner diameter to define a hollow center. A thermoplastic outer core layer is formed about the shell layer. An optional inner cover layer is formed about the outer core layer, the inner cover including an ionomeric material. An outer cover layer is formed over the core or option inner cover layer, the outer cover including a polyurea or a polyurethane and having a second hardness less than the optional inner cover layer. The hollow center has a diameter of about 0.15 to 1.1 inches. The shell layer has a surface hardness greater than its inner surface hardness by about 3 to 25 Shore C to define a hardness gradient, and the thermoplastic outer core layer has a second hardness gradient.

Abstract: A golf ball including a hollow core formed from a spherical inner core shell layer including a stiff thermoplastic composition. The shell layer has an outer surface, an inner surface, and an inner diameter to define a hollow center. Ann outer core layer is disposed about the shell layer and includes a thermoset material. An inner cover layer is disposed about the outer core layer and includes an ionomeric material having a first hardness. An outer cover layer is disposed about the inner cover layer and includes a polyurethane having a second hardness different from the first. The hollow center has a diameter of 0.15 to 1.1 inches, the thermoplastic inner core shell layer has a hardness of 85 Shore C or greater, and the stiff thermoplastic composition has a melt volume flow rate of about 5.0 cm3/10 min or less at 230° C./2.16 kg.

Abstract: A golf ball includes a spherical inner core shell layer formed from a thermoplastic composition. The shell layer has an outer surface, an inner surface, and an inner diameter to define a hollow center. A thermoplastic outer core layer is formed around the shell layer. An ionomeric inner cover layer and a urethane or urea outer cover layer are formed over the hollow core. The outer cover has a hardness less than the inner cover. The hollow center has a diameter of about 0.15 to 1.1 inches, the shell layer has a surface hardness greater than an inner surface hardness by about 0 to 5 Shore C to define a hardness gradient, and the thermoplastic outer core layer also has a hardness gradient.

Abstract: The invention relates to a device for developing hands muscles, formed by a body comprising a partially or fully hollow container (1) fitted with an upper movable cover (2) having one hole or a series of holes provided at one o more points along the periphery thereof for the coupling of transparent flexible tubes (3) which are open at both ends. According to the invention, the lower end (4) of the tube (3) is used for the insertion of a part having a surface that is fully or partially covered, especially in the peripheral area thereof, with longitudinal segments in the forms of pins or needles (6) inclined in the same direction with a variable degree of inclination. The ends (8) os said longitudinal segments are kept in contact with the inner face or wall of the tube (3). The device can be used for therapeutic uses, as a piece of gym equipment or as a toy.

Abstract: A golf ball 2 includes a spherical core 4, a mid layer 6 positioned outside the core 4, and a cover 8 positioned outside the mid layer 6. The core 4 includes a spherical center 10 and an envelope layer 12 positioned outside the center 10. The center 10 has a diameter of 1 mm or greater and 15 mm or less. The center 10 has a JIS-C hardness H1, at its central point, of 20 or greater and 50 or less. The difference (H4?H3) between the JIS-C hardness H4 of the core 4 at its surface and the JIS-C hardness H3 of the envelope layer 12 at its innermost portion is equal to or greater than 10. The cover 8 has a flexural modulus of 300 MPa or greater and 1000 MPa or less, and has a tensile modulus of 400 MPa or greater and 1500 MPa or less.

Abstract: A golf ball 2 includes a spherical core 4, a mid layer 6 positioned outside the core 4, and a cover 8 positioned outside the mid layer 6. The core 4 includes a spherical center 10 and an envelope layer 12 positioned outside the center 10. The center 10 has a diameter of 1 mm or greater and 15 mm or less. The center 10 has a JIS-C hardness H1, at its central point, of 20 or greater and 50 or less. The difference (H4?H3) between the JIS-C hardness H4 of the core 4 at its surface and the JIS-C hardness H3 of the envelope layer 12 at its innermost portion is equal to or greater than 10. The cover 8 has a flexural modulus of 300 MPa or greater and 1000 MPa or less, and has a tensile modulus of 400 MPa or greater and 1500 MPa or less.

Abstract: A golf ball 2 has a hollow center 8, a mid layer 10, an inner cover 12 and an outer cover 14. The center 8 is formed by crosslinking a rubber composition. The rubber composition contains a natural rubber as a base polymer. The rubber composition contains sulfur. The mid layer 10 is formed by crosslinking a rubber composition. This rubber composition includes butadiene as a principal component of the base polymer. The center 8 has an inside diameter of 2 mm or greater and 13 mm or less. The center 8 has an outside diameter of 5 mm or greater and 15 mm or less. The center 8 has a surface JIS-C hardness H2 of 25 or greater and 55 or less. A difference (H4?H3) between a surface JIS-C hardness H4 of the mid layer 10 and a JIS-C hardness H3 of an innermost part of the mid layer is equal to or greater than 10.

Abstract: The present invention encompasses a golf ball having a diameter and being comprised of a core and a cover, wherein the core is further comprised of a fluid mass at the center of the ball, and a first, solid, non-wound mantle layer surrounding the fluid mass, wherein the first mantle layer comprises a copolymer or terpolymer of ethylene and an ?,?-unsaturated carboxylic acid, the acid being neutralized at least 80% by a salt of an organic acid, a cation source, or a suitable base of the organic acid, and wherein the cover comprises polyurethane, polyurea, or a polyurea/polyurethane hybrid. Preferably, the rate of spin decay is at least 10% of an initial spin rate of the golf ball over the entire ball flight.

Abstract: The present invention encompasses a golf ball having a diameter and being comprised of a core and a cover, wherein the core is further comprised of a fluid mass at the center of the ball, a first mantle layer surrounding the fluid mass and a second, solid, non-wound mantle layer surrounding and abutting the first mantle layer, wherein the first mantle layer comprises a polymer material selected from the group consisting of a thermoset rubber, plastic and thermoplastic elastomeric material and the second mantle layer comprises a polymer material selected from the group consisting of a thermoset rubber material and thermoplastic elastomeric material, and wherein the cover comprises polyurethane, polyurea, or a polyurea/polyurethane hybrid.

Abstract: The present invention is a golf ball (10) with a core (12) and a cover layer (14). The core is preferably a metal wall (15) defining a hollow space (17). The cover layer (14) is preferably composed of a highly neutralized terpolymer and a fatty acid based moiety.

Abstract: Golf ball 1 includes a core 2 and a cover 3. The core 2 has two layers including a center 4 and a mid layer 5. The mid layer 5 is formed by covering the center 4 with two half shells comprising a rubber composition, and by compression and heating of the center 4 and half shells in a mold. The rubber composition contains solid particles dispersed therein. The solid particles have a ratio “D/T”, i.e., a ratio of the particle size D to the thickness of the mid layer T, of equal to or greater than 0.3. Upon molding, the solid particles inhibit the center 4 to approach a cavity face. Accordingly, deviation of mass of the mid layer 5 can be suppressed. The solid particles have a ratio “W/T”, i.e., a ratio of the radial width W thereof to the thickness of the mid layer T, of from 0.3 to 1.0.

Abstract: A golf ball 1 has a core 2 and a cover 3. For molding a core 2, a rubber composition is extruded from a kneading machine, and cut at a predetermined length to obtain a preforming material. The preforming material is placed in a mold and the mold is clamped. An upper portion and lower portion of the mold mate for more than or equal to 15 seconds, and thereafter they are unclamped until a clearance between the upper and lower portions becomes from 3 mm to 8 mm, then, the mold is shut. The shutting time is determined to be from 0.5 second to 5.0 seconds. By this unclamping of the mold, a residual air in a spherical cavity is released, which results in elimination of defective products.

Abstract: A golf ball having improved driving characteristics includes a hard, hollow sphere surrounded by an outer. A second layer may be disposed between the sphere and the outer cover. The hollow sphere is made from a hard material such as a metal, metal alloy, or intermetallic material and may be solid, perforated or porous. The second layer surrounding the sphere is generally made of a natural rubber or synthetic polymer or a combination of each which is surrounded by an outer cover made of an ionomer, urethane or balata. The hard sphere preferably contains a gas. A golf ball of this construction has improved performance characteristics such as low spin rate and further distance.

Abstract: A golf ball comprising a solid core and a cover disposed about the core, wherein the core is formed from a polybutadiene blend comprising a) a first polybutadiene having a first Mooney viscosity between about 50 and about 150, and b) a second polybutadiene having a second Mooney viscosity between about 30 and about 100, wherein the first Mooney viscosity is greater than the second Mooney viscosity, and wherein the blend has a greater weight percentage of the first polybutadiene than that of the second polybutadiene.

Abstract: A golf ball is provided having a controlled variable moment of inertia. The golf ball includes a core defining at least one hollow channel. At least one movable weight is located within each hollow channel. The end of the hollow channel at the outer edge of the core is enclosed with a plug. The movable weight and plug may each further include a magnet or the hollow channel may include a placement member such as a spring to control the movement of the weight. When the present golf ball is struck, the spin rate forces the weights to move from the interior of the core outwardly towards the outer edge of the core, thereby varying the moment of inertia of the golf ball. A method of manufacturing the present golf ball is also provided. The golf ball also significantly reduces hooks and slices due to the gyroscopic effect of the moving weight(s) to the outer edge of the core.

Abstract: A golf ball having improved driving characteristics includes a hard, hollow sphere surrounded by an outer. A second layer may be disposed between the sphere and the outer cover. The hollow sphere is made from a hard material such as a metal, metal alloy, or intermetallic material and may be solid, perforated or porous. The second layer surrounding the sphere is generally made of a natural rubber or synthetic polymer or a combination of each which is surrounded by an outer cover made of an ionomer, urethane or balata. The hard sphere preferably contains a gas. A golf ball of this construction has improved performance characteristics such as low spin rate and further distance.

Abstract: The present invention provides a hollow golf ball having good shot feel at the time of hitting by making impact force small, while keeping excellent flight performance. Improved shot feel at the time of hitting by improving an impact absorption, while keeping excellent flight performance. The present invention relates to a hollow golf ball comprising: a hollow core composed of a hollow portion and one or more hollow core outer layers formed from a core composition comprising rubber component, resin component or the mixture thereof, and a cover formed on the hollow core, wherein, when a secondary natural frequency of the hollow golf ball is expressed as X and a deformation amount, when applying from an initial load of 10 kgf to a final load of 130 kgf on the hollow golf ball, is expressed as Y, a difference of X−Y is within the range of 0.1 to 1.5.

Abstract: A sound-producing golf ball includes an outer shell with a shock-absorbent inner housing having a rechargeable micro-battery positioned therein. A micro-generator coupled to a rotatably mounted shaft is positioned in the housing. A pendulum depending from the shaft is urged downwardly by gravity for rotating the shaft as the golf ball rolls while in play, thus generating electricity for recharging the micro-battery. A sound chip having a memory for storing audible messages is positioned in the housing along with a sound generator for audibilizing the messages when energized. The housing may include a receiver for receiving a signal from a transmitter for selectively energizing operation of the sound chip and sound generator. The housing presents a geodesic configuration and includes a plurality of interconnected tetrahedral structures for absorbing impact forces.

Abstract: The present invention is directed to a golf ball comprising a soft core and a hard cover to produce a resulting molded golf ball having a reduced spin rate. The golf ball comprises one or more metal mantle layers and a cellular or liquid core component. The golf ball may also comprise an optional polymeric spherical substrate inwardly disposed relative to the one or more metal mantle layers. The golf ball of the present invention may also utilize an enlarged diameter which serves to further reduce spin rate. The resulting golf ball exhibits properties of reduced spin without sacrificing durability, playability and resilience.

Abstract: The present invention is directed towards a golf ball and a method of making a golf ball which comprises a center, at least one cover layer, and at least one wound layer of a tensioned material windings between the center and the cover. Such golf balls have a coefficient of restitution that is optimized for low swing speed players. Since these players usually swing the club at the ball at low swing speeds, and thus get less distance from the ball off the tee, greater ball resiliency tends to provide greater distance and velocity off the tee. Preferably, the golf ball has a core having a thin wound layer of thread. The wound layer of the present invention may be applied to golf balls having liquid or solid centers to achieve desired golf ball characteristics.

Abstract: The present invention provides a solid center type thread wound golf ball having long flight distance, while having good shot feel at the time of hitting the golf ball as good as liquid center type thread wound golf balls. The present invention thus provides a thread wound golf ball comprising a solid center, a thread rubber layer formed on the solid center, and a cover covering the thread rubber layer wherein, the solid center has a diameter of 33 to 38 mm, a ratio of surface hardness in JIS-C hardness to diameter of 2.15 to 2.50, and a ratio of center hardness in JIS-C hardness to diameter of 1.30 to 2.00, and the cover has a Shore D hardness of 40 to 65. Further, the solid center of the thread wound golf ball has a center hardness in JIS-C hardness of 50-75, and a surface hardness larger than the center hardness by not less than 10, and the thread rubber layer has a thickness of 1.0 to 4.0 mm.

Abstract: A golf ball retaining high coefficient of restitution inherent and having fine shot feeling with clubs such as drivers, irons and putters is disclosed. A multi-piece golf ball comprising; a center core having a JIS-C hardness of not more than 75, a cover having a JIS-C hardness of not less than 85, a core enclosing layer which directly enclose said center core having a JIS C hardness smaller than the others, and a r.d.preventing layer which prevents a restitution coefficient degradation being internally disposed in contact with said cover and having a JIS C hardness greater than the others.

Abstract: The present invention provides a two-piece solid golf ball having excellent flight performance and good shot feel when hit by a driver, and excellent controllability when hit by an iron club. The present invention relates to a two-piece solid golf comprising a core, and a cover formed on the core, wherein the core has a JIS-C center hardness of not more than 60, a JIS-C surface hardness of 70 to 95, a difference between the center hardness and surface hardness of 20 to 40 and a deformation amount of 2.6 to 3.5 mm when applying from an initial load of 10 kgf to a final load of 130 kgf, and the cover has a Shore D hardness of not more than 60 and a thickness of 1.2 to 2.0 mm.

Abstract: The present invention is directed to a multi-piece solid golf ball exhibiting excellent flight performance by optimizing the trajectory of the golf ball during flight. The golf ball of the present invention satisfies the formula 1020≦(NY+266H)≦1085 with total number of dimples being N, the quotient Y being determined by dividing A by B in which A is the total area of a plane defined by a dimple edge and B is a surface area of a sphere when the sphere is formed assuming that there is no dimple on the cover, and a deformation amount H when applying from an initial load of 10 kgf to a final load of 130 kgf on the golf ball.

Abstract: The present invention provides a hollow solid golf ball having excellent flight performance and soft and good shot feel at the time of hitting. The present invention relates to a hollow solid golf ball comprising a core having a hollow portion at the center of the core and a cover formed on the core, wherein the golf ball has a diameter of 42.92 to 45.47 mm, a moment of inertia of 83 to 105 g·cm2, and a deformation amount of 2.6 to 4.0 mm, when applying from an initial load of 10 kgf to a final load of 130 kgf.

Abstract: A unique golf ball and related methods of manufacturing are disclosed in which the golf ball comprises one or more metal mantle layers that define a hollow interior within the ball. The golf ball may also comprise an optional polymeric hollow spherical substrate inwardly disposed relative to the one or more metal mantle layers. The golf balls according to the present invention exhibit improved spin, feel, and acoustic properties. Furthermore, the one or more interior metal layers prevent, or at least significantly minimize, coefficient of restitution loss from the golf ball.

Abstract: A golf ball comprising a core and a cover disposed about the core, wherein the core comprises a center and at least one outer core layer adjacent the center, and the cover comprises at least one inner cover layer and an outer cover layer, wherein the center has an outer diameter from about 0.375 in to about 1.4 in and deflection of greater than about 4.5 mm under a load of 100 Kg, the outer core layer has an outer diameter of from about 1.4 in to about 1.62 in, the inner cover layer has an outer diameter of greater than about 1.58 in and a material hardness of less than about 72 Shore D, and the outer cover layer has a hardness of greater than about 50 Shore D.

Abstract: The present invention relates to a golf ball comprising a core layer, at least one intermediate layer, and a cover layer, wherein the core layer or the at least one intermediate layer are formed from compositions comprising a polyamide, in the form of a homopolymer, a copolymer, or mixtures thereof. The compositions comprise about 1 to about 99 weight percent of at least one nonionomer polymer and about 99 to about 1 weight percent of at least one polyamide polymer. The polyamides of the present invention comprise polyamides and polyamide copolymers, such as nylons, nylon copolymers, and nylon block copolymers. The nonionomer polymer comprises a nonionomer thermoplastic elastomer or a nonionomer thermoplastic.

Abstract: The present invention is directed to improved polybutadiene compositions suitable for use in molded golf ball core construction. The improved polybutadiene compositions are composed of a particular type of solid polybutadiene which has the effect of increasing the resiliency of the resulting molded cores. Also disclosed are improved golf ball cores, and balls utilizing such cores, formed from particular ultra-high Mooney viscosity polybutadiene.

Abstract: The present invention provides a multi-layer structure golf ball having a thread rubber layer, which has good shot feel and controllability as well as satisfactory flight performance and cut resistance. The golf ball includes a thread wound core and a cover covering the thread wound core, wherein the cover is formed from a heated mixture of: (A) an ionomer resin, (B) a thermoplastic elastomer having a carboxyl group or a thermoplastic elastomer having a terminal OH group, and (C) a block copolymer having a styrene-butadiene-styrene structure in which the polybutadiene block contains epoxy groups, or a block copolymer having styrene-isoprene-styrene structure in which the polyisoprene block contains epoxy groups, the cover has a flexural modulus of from 50 to 300 MPa and a Shore D-scale hardness of from 40 to 60.

Abstract: In a multilayer structure solid golf ball having a solid core, an intermediate layer, and a cover, the intermediate layer is formed mainly of a thermoplastic polyurethane elastomer, and the cover is formed mainly of an ionomer resin. An adhesive layer intervenes between the intermediate layer and the cover. The ball has improved rebound and spin properties.

Abstract: The present invention provides golf balls having a cover, a core, and optionally one or more intermediate layers between the cover and the core, wherein at least one of the cover, the core and, if present, the intermediate layer(s), is formed of an ion-containing polymer composition, particularly a zwitter-ion or ionene polymer. The zwitter-ion polymers contain both cationic and anionic species on the polymer backbone or as a pendant group on the polymer backbone. The ionene polymers are contain only a cationic portion attached to the polymer backbone and are associated with another ion. These ion-containing polymer compositions can be used to provide improved characteristics to golf balls made therefrom. The invention also relates to methods of making and using the compositions in golf balls.

Abstract: A thread-wound golf ball comprising a large, heavy center with rubber thread windings and a cover is disclosed. The center has a diameter of about between 1.40″ and 1.53″, a weight of about between 24-34 g and a deformation of about between 0.080-0.160″ when subjected to a 200 lb. load. The cover is a thermosetting or thermoplastic material with a hardness range between 40-70 Shore D. A golf ball according to the invention exhibits the combined superior characteristics of two-piece and three-piece golf balls, i.e., ease of manufacture, feel, playability, durability and distance travel.

Abstract: This invention relates to methods of using cationic ionomers in the composition of inner layers of golf balls. Further, this invention relates to golf balls comprising one or more inner layers and which incorporate polyurethane or polyurea ionomers. The golf ball with inner layers comprising cationic ionomers has improved ball feel and initial velocity through the addition of an alkylating agent such as t-butyl chloride to introduce ionic interactions in the polyurethane or polyurea and thereby produce cationic type ionomers.

Abstract: The present invention is directed to a golf ball comprising a soft core and a hard cover to produce a golf ball having a reduced spin rate. The present invention is also directed to an improved golf ball comprising at least one interior layer and/or a core comprising a silicone material. It is preferred to also utilize a multi-layer cover in conjunction with the silicone materials. The golf ball of the present invention may also utilize an enlarged diameter which serves to further reduce spin rate. The resulting golf ball exhibits properties of reduced spin without sacrificing durability, playability and resilience.

Abstract: A low compression, resilient golf ball having a center and a cover, wherein at least a portion of the ball is formed from the conversion reaction of an amount of polybutadiene, a free radical source, and a cis-to-trans catalyst including at least one inorganic sulfide at a sufficient temperature to form a polybutadiene reaction product which includes an amount of trans-polybutadiene greater than the amount of trans-polybutadiene present before the conversion reaction and a cis-to-trans catalyst including at least one inorganic sulfide. The reaction product preferably has a first dynamic stiffness measured at -50.degree. C. that is less than about 130 percent of a second dynamic stiffness measured at 0.degree. C. A multi-layer golf ball having a center, at least one intermediate layer disposed concentrically about the center, and a cover, wherein at least a portion of at least one of the center, intermediate layer, or both, are made from the reaction product.

Abstract: A method of producing a hollow golf ball having excellent durability, which comprises a hollow portion with perfect spherical shape. The method of making a hollow golf ball having a hollow core composed of a hollow center having a hollow portion and optionally one or more intermediate core layers formed on the hollow center, and a cover formed on the hollow core, includes the steps of (a) preparing a rubber composition for the hollow center, (b) molding the rubber composition for the hollow center into a vulcanized semi-spherical half-shell, and (c) bonding the two vulcanized semi-spherical half-shells by placing an unvulcanized adhesive rubber composition between bonding surfaces of the two vulcanized semi-spherical half-shells, and vulcanizing it in a mold to form the hollow center, wherein the unvulcanized rubber composition has a t.sub.90 time of 5 to 20 minutes, the t.sub.

Abstract: A golf ball having a cover composed of a polyurethane formed from a p-phenylene diisocyanate (PPDI) based polyurethane prepolymer is disclosed herein. The PPDI-based polyurethane prepolymer is formed from a PPDI and a polyol such as polycaprolactone. The PPDI-based polyurethane prepolymer is cured with a curative such as a 1,4 butane diol and glycol. The PPDI-based polyurethane cover may be either thermoset or thermoplastic. The PPDI-based polyurethane cover has a high flexural modulus at a lower hardness which gives a better feel yet maintains good distance, higher Bashore resilience, higher tensile strength, higher tear resistance, improved elongation, and better playability and control. These benefits and improvements are exhibited even though the cover of the present invention is thinner than those of conventional golf balls. The present invention also provides new golf balls having durable thin covers thereby enabling golf balls with large cores.

Abstract: A three-layered solid golf ball structure includes a core, an intermediate layer, and an outer shell. The intermediate layer is formed from a material compounded from a thermosetting elastomer and an amorphous alloy so as to attribute high strength and high elasticity to the golf ball. The specific weight and hardness of the golf ball can also be adjusted to achieve preferred sense of striking, a farther flying distance, and a longer useful life.

Abstract: The present invention provides a hollow, solid golf ball having improved shot feel at the time of hitting by improving the impact absorption, while maintaining excellent flight performance. The present invention relates to a hollow, solid golf ball comprising a hollow core and a cover formed on the core, wherein the hollow core is composed of a hollow portion having a diameter of 5 to 23 mm and a hollow core outer layer, and the hollow core outer layer has an elastic modulus of 265 to 985 kgf/cm.sup.2.