Golf balls having foam center containing clay particulate

摘要

Multi-piece golf balls having a solid core made of a foamed composition and a cover are provided. Preferably, the core is dual-layered having has a foam inner core (center) and surrounding thermoset or thermoplastic outer core layer. Preferably, a polyurethane foam composition containing mineral filler particulate, for example, nanoclay particles, is used to form the foam center. The surrounding outer core layer may be made from non-foamed or foamed compositions. For example, polybutadiene rubber or highly neutralized olefin acid copolymers may be used in the outer core layer. The core layers have different hardness gradients and specific gravity values.

主权项

1. A core assembly for a golf ball, 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), the foamed composition comprising mineral filler particulate in an amount of about 0.1 to about 9.0% by weight; and ii) an outer core layer comprising a non-foamed thermoset or thermoplastic material, 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), wherein the SGouter, is greater than the SGinner,.