Abstract: A method of manufacturing a golf ball includes molding a cover preform in a first mold. The cover preform is placed in a second mold. Material is injected into an interior of the cover preform. The material forces the cover preform against a surface of the second mold to form dimples in the cover. The dimples may extend through the cover to form dimple structures in at least one layer between the cover and a center of the golf ball. For instance, the dimples may extend through the cover and into the injected material. The dimples may have a depth greater than a thickness of the cover.

Abstract: A golf ball having a core that includes an aqueous solution contained by a boundary layer with a solid center suspended in the solution to modify the moment of inertia of the golf ball. The aqueous solution can be thixotropic, or rheopectic, or dilatant, or pseudoplastic in nature and the center formulated to simulate the specific gravity of the solution.

Abstract: A four piece golf ball includes several relationships among the values of the densities of its layers. Namely, the sum of the density of the inner core and the outer core is at least 2 g/cm3, the sum of the density of the inner cover layer and the outer cover layer is at least 2.2 g/cm3, and the difference between these two sums is at least 0.1 g/cm3. The inner core is made of a highly neutralized acid polymer, the outer core is made of a polybutadiene rubber, and the inner and outer cover layers are made of a non-ionomeric thermoplastic material, such as thermoplastic polyurethane. The layers may have certain relationships among their hardness values. Finally, the golf ball exhibits certain physical properties, such as a certain moment of inertia.

Abstract: A ball includes a core, a cover, and an intermediate layer between the core and the cover. The intermediate layer may be deformed or actuated to create discontinuities in the cover. The creation of discontinuities allows for easier recycling of the ball parts. The intermediate layer may include one of a bladder or a hydrophilic material that expand upon the introduction of a fluid, a shape memory polymer that deforms upon application of a stimulus, or two materials that react chemically to form a gas.

Abstract: A golf ball having a cover comprising thin inner and outer layers formed by a co-injected cup process. The inner layer comprising a hard Surlyn while the outer layer comprises a composition a bi-modal ethylene-acid copolymer composition. The core size will be greater than 1.50 inches in diameter. The golf ball will provide a cover that is compression molded and is very soft without sacrificing durability or shear resistance. The outer layer comprising a bi-modal ethylene-acid co-polymer composition.

Abstract: A high impact game ball with a core structure founded on a spherical member, a spherical casing concentrically disposed relative to the spherical member, at least one surface deviation disposed relative to the spherical member of the core structure, and at least one corresponding surface deviation disposed relative to the spherical casing in a mating relationship with the at least one surface deviation of the spherical member. A switching arrangement can be embedded in the spherical member for causing a response to be exhibited based on the occurrence of an activation condition, such as an impact or a remote activation signal. A plurality of positioning stays can project from the spherical member to ensure a concentric relationship relative to the spherical casing.

Abstract: The invention relates to a method for forming golf equipment, or a portion thereof, preferably for forming one or more layers of a golf ball, including: providing a first reactable component containing an isocyanate-containing compound, and a second reactable component containing at least one polyol, polyamine, or epoxy-containing compound; mixing the reactable components together to form a reactive mixture; and injecting the reactive mixture into a cavity or mold having a desired shape within a time sufficient to avoid substantial polymerization, gelation, or solidification.

Abstract: A reaction injection molding process and compositions for forming golf equipment or components thereof that involves providing at least two reactable components that have a fast reaction time and injecting them with sufficient speed after they are mixed so that they are polymerized, solidified, or gelled in a mold cavity.

Abstract: This invention is directed to golf balls having at least two adjacent layers, wherein a coating layer of metal materials is on at least one surface of the adjacent layers. The adhesion of the adjacent layer is improved by induction heating. The invention also is directed to ink solution for golf equipment comprising metal materials that can improve adhesion of the ink to the golf equipment.

Abstract: A solid golf ball is composed of a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples. The solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm. The cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon. The ball has an initial velocity of at least 76.8 m/s, a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm. The golf ball has a carry which is long enough to make the ball advantageous for competitive play, in addition to which it has a good feel when hit and excellent durability to cracking with repeated impact.

Abstract: A solid golf ball is composed of a solid core and a cover of one or more layers which encloses the core and has on a surface thereof numerous dimples. The solid core has a diameter of 38.7 to 39.6 mm and a deflection hardness of 3.0 to 4.0 mm. The cover has a Shore D hardness of 59 to 70 and has 313 to 371 dimples formed thereon. The ball has an initial velocity of at least 76.8 m/s, a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm. The golf ball has a carry which is long enough to make the ball advantageous for competitive play, in addition to which it has a good feel when hit and excellent durability to cracking with repeated impact.

Abstract: Golf equipment having improved cut and shear resistance that includes a polyurea-based composition or polyurethane-based composition, preferably saturated and/or water resistant, formed of a prepolymer, a functionalized block copolymer, and optionally further cured or chain extended with a curing agent, where the prepolymer is incorporated at the terminal end of the functionalized block copolymer.

Abstract: In a golf ball comprising a solid core, an intermediate layer, and a cover, the solid core or the cover is provided with a plurality of protrusions penetrating into the intermediate layer. Provided the protrusions are spaced apart a distance X (mm) and have a length L (mm), those protrusions satisfying L≦X≦5L account for at least 60% of the entire protrusions. The protrusions penetrating into the intermediate layer optimizes the buckling phenomenon whereby the ball is improved in flight performance, control and feel.

Abstract: A golf ball comprising: a spherical elastic core; an inner cover comprising a resin; and an outer cover comprising a relatively hard resin or rubber and having dimples in an outer surface thereof, wherein the inner cover defines a large number of small holes disposed and substantially evenly dispersed in a periphery thereof, wherein the outer cover has protrusions which extend from an inner surface thereof into the small holes in the inner cover to conform with the small holes, and wherein the interface formed between the inner cover and the outer cover includes a relatively rough interface circumferentially extending along an outer surface of the inner cover and a relatively smooth interface radially extending along wall faces of the small holes.

Abstract: The invention provides a golf ball comprising a core and a cover, wherein the cover consists of an outer layer and an inner layer having a lower hardness than the outer layer. The cover inner layer is formed with a plurality of recesses in its outer surface and the cover outer layer is formed over the cover inner layer in such a manner that the cover outer layer penetrates into the recesses in the cover inner layer to form protrusions. The sum of the cross-sectional areas of the protrusions at their base accounts for 2-45% of the surface area of an imaginary smooth cover inner layer. The protrusions have a height corresponding to 30-100% of the thickness of the cover inner layer where no recesses are formed. The ball receives a reduced spin and travel a distance upon driver shots, but receives an increased spin and is easy to control upon iron or sand wedge shots.

Abstract: A practice golf ball is produced by sewing up at least two pieces of preferably symmetrical surface cloth to form a ball shell defining a spherical space therein and evenly stuffing fibrous material into the spherical inner space via an opening left on a seam between the sewed-up surface cloths. The opening is then sewed up to seal the fibrous material in the ball shell. A thermosetting resin is injected into a geometrical center of the ball shell. When the resin is cooled and set, it binds the fibrous material at the geometrical center and forms a weighted core that provides a stable center of gravity for the completed practice golf ball.

Abstract: In preparing a golf ball comprising an inner cover (8) and an outer cover (13) around a core (5), an injection mold is used for the injection molding of the inner cover. The mold has a molding surface defining a cavity (4) and a plurality of opposed support pins (6) adapted to be moved into and out of the cavity with respect to the molding surface. The inner cover is formed by supporting the core in the cavity by means of the support pins, leaving a space between the core and the molding surface, injecting a molding material into the space, and curing the injected molding material while support pins are being projected into the cavity and/or support pins have been withdrawn behind the molding surface, thereby forming around the core the inner cover (8) having recesses (12) and/or protrusions (14).

Abstract: A golf ball includes a spherical outer-layer core having a concentric spherical inner cavity and having a wall thickness of 5-10 mm. A spherical inner-layer core having a diameter smaller than that of the spherical cavity is disposed within the spherical cavity of the outer-layer core. A cover is formed on the outer surface of the outer-layer core. A liquid is charged into the space between the outer-layer core and the inner-layer core to thereby form a liquid layer having a thickness of 1-3 mm. The liquid has a specific gravity substantially equal to that of the material of the inner-layer core. In the golf ball, the inner-layer core and outer-layer core can rotate independently while the golf ball is traveling. Also, the golf ball has sufficient resilience and strength.

Abstract: A method of applying a coating material to an outer surface of a golf ball, the method comprising molding a golf ball having an outer dimpled surface under a pressure greater than ambient pressure within a mold cavity; formulating a golf ball coating composition; introducing a sufficient amount of the coating composition into the mold cavity between the golf ball outer surface and an inner surface of the mold cavity to substantially surround and coat the entire outer surface of the golf ball; curing the coating composition upon the ball outer surface and removing the coated ball from the mold cavity.

Abstract: A multi-piece solid golf ball includes a solid core, at least one intermediate layer, and a cover having at least one cover layer. The solid core has a compression deflection of 3.0 mm or more, the intermediate layer is mainly made from a thermoplastic resin and has a Shore D hardness of 45 to 55 and a specific gravity of 1.2 or less, and the cover has a Shore D hardness of 60 or more and a thickness of 1.6 to 2.3 mm. The golf ball further comprises a ratio of the compression deflection of a sphere composed of the solid core covered with the intermediate layer to the compression deflection of the solid core is more than 0.900 and less than 0.970; and a difference in JIS-C hardness between the surface and the center of the solid core is equal to or less than 5.