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AssigneeNIKE, Inc.
InventorsHideyuki Ishii, Yasushi Ichikawa, Chien-Hsin Chou, Chen-Tai Liu, Arthur Parker Molinari
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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.
A golf ball comprising an inner core layer comprising a blend comprising 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, an outer core layer having a thickness between about 5 mm and about 9 mm essentially enclosing the inner core layer and comprising thermoset material, and a cover layer essentially enclosing the outer core layer, wherein 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.
Dependencies are inferred from the claim text.