主权项 |
1. A core assembly for a golf ball, comprising:
i) an inner core layer comprising a foamed composition, the inner core layer having a diameter in the range of about 0.100 to about 1.100 inches, a specific gravity (SGinner), and an outer surface hardness (Hinner core surface) and a center hardness (Hinner core center), the Hinner core surface being greater than the Hinner core center to provide a positive hardness gradient; ii) an intermediate core layer comprising a first thermoset material, the intermediate layer being disposed about the inner core and having a thickness in the range of about 0.050 to about 0.400 inches, a specific gravity (SGintermediate), and an outer surface hardness (Houter surface of IC) and an inner surface hardness (Hinner surface of IC), the Houter surface of IC being the same or less than the Hinner surface of IC to provide a zero or negative hardness gradient; and iii) an outer core layer comprising a second thermoset material, the outer core layer being disposed about the intermediate core layer and having a thickness in the range of about 0.100 to about 0.750 inches, a specific gravity (SGouter), and an outer surface hardness (Houter surface of OC) and an inner surface hardness (Hinner surface of OC), the Houter surface of OC being greater than the Hinner surface of OC to provide a positive hardness gradient, wherein the SGouter, is greater than the SGinner, and the SGintermediate is greater than the SGinner. |