MULTI-LAYERED GOLF BALLS HAVING FOAM CENTER WITH SELECTIVE WEIGHT DISTRIBUTION

摘要

Multi-layered golf balls having a core made of a foamed polyurethane composition are provided. The ball includes a dual-layered core having a foam inner core (center) and surrounding outer core layer. The outer core layer may be made from a non-foamed thermoset material such as polybutadiene rubber. The ball further includes an inner cover, preferably made from a thermoplastic ionomer. The outer cover may be made from a non-foamed thermoset or thermoplastic material such as polyurethane. The core and inner cover layers preferably have different densities so the Moment of Inertia of the ball is adjusted. Preferably, the specific gravity of the inner cover is greater than the specific gravity of the outer core, which is greater than the specific gravity of the inner core. The finished ball has good distance and low-spin properties.

主权项

1. A multi-layered golf ball, comprising:
a core assembly comprising: i) an inner core layer comprising a foamed polyurethane composition, the inner core layer having a diameter in the range of about 0.100 to about 1.100 inches and a specific gravity (SGinner) and a center hardness (Hinner core center); and ii) an outer core layer comprising a non-foamed thermoset or thermoplastic composition, the outer core layer being disposed about the inner core layer and having a thickness in the range of about 0.100 to about 0.750 inches and a specific gravity (SGouter) and an outer surface hardness (Houter surface of OC); and a multi-layered cover comprising: i) an inner cover layer comprising a non-foamed thermoplastic material having a specific gravity (SGinner cover); and ii) an outer cover layer comprising a non-foamed thermoset or thermoplastic composition, wherein the SGinner cover>SGouter core>SGcenter and the Hinner core center is in the range of about 10 to about 60 Shore C and the Houter surface of OC is in the range of about 65 to about 96 Shore C to provide a positive hardness gradient across the core assembly.