A golf ball comprising a core composed of a fully neutralized polymer material is disclosed herein. The golf ball also preferably has multiple mantle layers and a cover.

The invention provides a golf ball having a core and a cover of one or more layer encasing the core, wherein the core has a center core and a foamed outer layer that directly, or indirectly through another layer, envelops the center core. The foamed outer layer is made of a rubber composition that includes a base rubber, a co-crosslinking agent and an organic peroxide. The foamed outer layer has an inside portion facing the ball center and an outside portion facing the outside of the ball that are unfoamed regions, and contains a foamed region in an intermediate portion therebetween. A method of manufacturing such a golf ball is also provided.

Golf ball having CoR of at least 0.700 and compression of at least 50 and comprising a layer of a mixture of thermoset or thermoplastic composition and a plurality of conductive nanoshelled structures such as conductive hollow nanoshells and/or nanorice particles. Conductive nanoshelled structures may be included in amount of from about 2 wt % to greater than 50 wt. % of total weight of mixture. Diameter of each conductive nano shelled structure at widest cross-section may be up to 1000 nm. Each conductive hollow nanoshell may have shell thickness to longitudinal diameter ratio of from about 1:3 to about 1:100. Each nanorice particle may have longitudinal diameter of up to 1000 nm. Shell thickness can be from 1 nm to 100 nm and may be controlled. A layer consisting of mixture may have specific gravity that differs from specific gravity of a layer consisting of the thermoset or thermoplastic composition portion of mixture.

The invention provides a golf ball having a core and a cover of one or more layer encasing the core, wherein the core is formed of a rubber composition that includes a base rubber, a co-crosslinking agent and an organic peroxide. The core has a center portion and a surface portion that are unfoamed regions, and has an intermediate portion that contains a foamed region. A method of manufacturing such a golf ball is also provided.

Golf ball having CoR of at least 0.700 and Atti compression of at least about 50 and comprising layer consisting of mixture of thermoset or thermoplastic composition and plurality of particulates, at least a portion surface-treated with alkoxylated siloxanes and/or polyether-modified siloxanes, and may be selected from titanium dioxide particles, barium sulfate particles, zinc sulfide particles, and/or zinc oxide particulates. At least some particulates are contacted with compound having the formula:

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Compound (I) may be included in amount of 0.01 to 2% by weight based on total weight of portion of plurality being contacted. The plurality may be included in mixture in amount such that layer has specific gravity of from 0.5 to about 10.0, tensile strength of from about 300 psi to about 50,000 psi, and elongation at break of from about 20% to about 1000%, each being greater than that of the thermoset or thermoplastic composition portion of the mixture.

A golf ball comprising a core composed of a fully neutralized polymer material is disclosed herein. The golf ball also preferably has multiple mantle layers and a cover.

The invention provides a golf ball having a core and a cover of one or more layer encasing the core, wherein the core is formed of a rubber composition that includes a base rubber, a co-crosslinking agent and an organic peroxide. The core has a center portion and a surface portion that are unfoamed regions, and has an intermediate portion that contains a foamed region. A method of manufacturing such a golf ball is also provided.

Golf ball having CoR of at least 0.810, specific gravity SG.sub.B of less than 1.00 g/cc, and initial velocity of at least 250 ft/s and comprising a first layer L.sub.1, a second layer L.sub.2 surrounding L.sub.1, and a third layer L.sub.3 surrounding L.sub.2. L.sub.1 is formed from at least one highly neutralized polymer and has first specific gravity SG.sub.1; L.sub.2 is formed from at least one partially neutralized polymer and has second specific gravity SG.sub.2; and L.sub.3 is formed from at least one of a thermoset or thermoplastic composition and has third specific gravity SG.sub.3. At least two of SG.sub.1, SG.sub.2, and SG.sub.3 is less than 1.13 g/cc. SG.sub.1 may be less than 1.13 g/cc, or less than 1.0 g/cc. The thermoset or thermoplastic composition may comprise polyurethane(s), polyurea(s), polyurethane(s)/polyurea(s) hybrids, and/or ionomers such as at least partially neutralized polymers and/or HNPs.

A multi-piece solid golf ball includes a core, an intermediate layer, and a cover, in which the core is formed of a rubber composition, the intermediate layer and the cover are formed of a single-layer resin composition, and a relationship among an initial velocity of the core, an initial velocity of an intermediate layer-encased sphere, and an initial velocity of a sphere (ball) obtained by encasing the intermediate layer-encased sphere with the cover satisfies (ball initial velocity)<(initial velocity of intermediate layer-encased sphere) and 0.60(initial velocity of intermediate layer-encased sphere)(core initial velocity)0.90 (m/s). When each sphere of the core and the ball is compressed under a specific load and deflections are denoted by C (mm) and B (mm), respectively, a value of CB is not more than 1.10 mm, and 0.024(intermediate layer thickness)/(ball diameter)0.034 is satisfied.

A golf ball having an inner core layer, an outer core layer enclosing the inner core layer, and a cover layer enclosing the outer core layer. The inner core layer includes a blend of a first highly neutralized acid polymer having a first Vicat softening temperature and a first specific gravity, a second highly neutralized acid polymer having a second Vicat softening temperature and a second specific gravity, and an ionomer-based masterbatch comprising an additive and an ionomer resin having a third Vicat softening temperature and a third specific gravity. The absolute values of the differences among the Vicat softening temperatures is no more than about 15 C. and the absolute value of the difference between the specific gravities is no more than about 0.015. The cover layer may include an inner cover layer enclosing the outer core layer and an outer layer enclosing the inner cover layer.