Multi-layered golf balls having a dual-layered core and cover of at least one layer are provided. The dual-core construction includes a non-foamed inner core (center) made of a thermoplastic or thermoset composition such as polybutadiene rubber. An outer core layer comprising a foamed composition, such as polyurethane foam, is disposed about the inner core. In one version, the foamed outer core layer is made of a relatively soft foam composition having low flex modulus and density. The foamed outer core layer may specific gravity gradient within the layer, wherein the outer surface specific gravity is greater than the midpoint specific gravity. A cover may be disposed about the core structure. For example, an inner cover made of ethylene acid copolymer ionomer and outer cover made of polyurethane may be used.

A bowling ball can have an inner core layer that is shaped, constructed, and/or configured to provide the bowling ball with one or more prescribed properties or characteristics, and a cover stock layer comprising a liquid curable material received about the inner core layer. The bowling ball further has a riser pin feature that is at least partially defined by a passage extending through at least the cover stock layer and in which a filler material is received. The riser pin feature can be located in an opposite hemisphere of the bowling ball from a hemisphere including the true center of gravity and a marked heavy spot of the bowling ball and can be arranged within about 1 inch of an end of the Low Radius of Gyration Axis of the bowling ball.

A bowling ball can have an inner core layer that is shaped, constructed, and/or configured to provide the bowling ball with one or more prescribed properties or characteristics, and a cover stock layer comprising a liquid curable material received about the inner core layer. The bowling ball further has a riser pin feature that is at least partially defined by a passage extending through at least the cover stock layer and in which a filler material is received. The riser pin feature can be located in an opposite hemisphere of the bowling ball from a hemisphere including the true center of gravity and a marked heavy spot of the bowling ball and can be arranged within about 1 inch of an end of the Low Radius of Gyration Axis of the bowling ball.

Provided is a bismuth golf ball with improved carry distance and fracture strength by adding a nano bismuth reformed by using plasma or a nano bismuth alloy manufactured by using the nano bismuth to a resin composition as a base material as compared with a bismuth golf ball in the related art. Since the nano bismuth golf ball has a more densified internal structure due to a higher content of bismuth as compared with the bismuth golf ball, the resilient elasticity is improved, and thus, the carry distance is increased.

Golf balls having an inner core made of a foamed composition are provided. The core assembly preferably includes a foam inner core (center) and surrounding outer core layer. A cross-linked thermoplastic, preferably an ethylene acid copolymer ionomer, is used to form the foam composition. The core layers have different hardness gradients and specific gravity values. The ethylene acid copolymer is reacted with a metallic acrylate salt and peroxide free-radical initiator to form the cross-linked polymer. The foamed, cross-linked composition helps provide the inner core with good resiliency, thermal stability, and durability. Non-foamed thermoplastics or thermosets such as polybutadiene rubber may be used to form the outer core layer. The ball further includes a cover that may be multi-layered.

Compositions including a resiliency additive and golf ball components made from such compositions having a tailored Coefficient of Restitution are disclosed. The type and concentration of the constituents in the composition, including the resiliency additive, affects the Coefficient of Restitution of components made from the composition and, thus, can be used to produce a golf ball having desirable performance characteristics.

Compositions including a resiliency additive and golf ball components made from such compositions having a tailored Coefficient of Restitution are disclosed. The type and concentration of the constituents in the composition, including the resiliency additive, affects the Coefficient of Restitution of components made from the composition and, thus, can be used to produce a golf ball having desirable performance characteristics.

Multi-layered golf balls having a core, intermediate layer, and cover are provided. The ball includes a non-foamed inner core (center) made of a thermoplastic or thermoset composition such as polybutadiene rubber. An intermediate layer comprising a foamed composition, such as polyurethane foam, is disposed about the inner core. The foamed intermediate layer may have a specific gravity gradient within the layer, wherein the outer surface specific gravity is greater than the midpoint specific gravity. Ball constructions having two intermediate layers, wherein at least one layer is a foamed layer can be made. A cover having at least one layer is disposed about the intermediate layer.

The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.

A spiked ball includes an inflatable ball having an outer surface and a series of protrusions on the outer surface. The protrusion each appear as a tear-dropped shape mass that includes a base having a relatively flat bottom adhered to the outer surface and a narrow tip extending away from the outer surface. The narrow tip may also appear as a curved tale. The spikes provide a unique tactile feel and a surface for gripping that is different than other balls. The spikes also cause the ball to contact or grab the ground to create a unique bounce.