Golf balls having foam centers with non-uniform core structures
First Claim
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1. A multi-layered golf ball, comprising:
- i) an inner core comprising a foamed polyurethane, the inner core having a center and outer surface, and a diameter in the range of about 0.100 to about 1.100 inches, the inner core having projecting members on the outer surface;
ii) an outer core layer comprising a non-foamed thermoset or thermoplastic material, the outer core layer being disposed about the inner core and having a thickness in the range of about 0.200 to about 0.800 inches, wherein the inner core has a specific gravity (SGinner) and a center hardness (Hinner core center), and the outer core has a specific gravity (SGouter) and an outer surface hardness ((Houter surface of OC), the SGouter, being greater than the SGinner and the Hinner core center being in the range of about 10 to about 80 Shore C and the Houter surface of OC being in the range of about 65 to about 96 Shore C to provide a positive hardness gradient across the core assembly; and
iii) a cover having at least one layer disposed about the multi-layered core.
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Abstract
Multi-piece golf balls having a solid core and cover are provided. The ball contains an inner core made of a foam composition and surrounding outer core layer. Preferably, foamed polyurethane is used to form the inner core and polybutadiene rubber is used to make the outer core. The specific gravity (density) of the inner core is preferably less than the density of the outer core. The outer surface of the inner core preferably has a non-uniform structure and includes projecting members. The ball preferably has a high Moment of Inertia (MOI). The ball includes a single or multi-layered cover surrounding the core structure.
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Citations
20 Claims
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1. A multi-layered golf ball, comprising:
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i) an inner core comprising a foamed polyurethane, the inner core having a center and outer surface, and a diameter in the range of about 0.100 to about 1.100 inches, the inner core having projecting members on the outer surface; ii) an outer core layer comprising a non-foamed thermoset or thermoplastic material, the outer core layer being disposed about the inner core and having a thickness in the range of about 0.200 to about 0.800 inches, wherein the inner core has a specific gravity (SGinner) and a center hardness (Hinner core center), and the outer core has a specific gravity (SGouter) and an outer surface hardness ((Houter surface of OC), the SGouter, being greater than the SGinner and the Hinner core center being in the range of about 10 to about 80 Shore C and the Houter surface of OC being in the range of about 65 to about 96 Shore C to provide a positive hardness gradient across the core assembly; and iii) a cover having at least one layer disposed about the multi-layered core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification