GOLF BALLS HAVING A MULTI-LAYERED CORE WITH A THERMOSET RUBBER CENTER

摘要

Golf balls having a multi-layered solid core and multi-layered cover are provided. The center of the core is made of a thermoset rubber material and preferably has a positive hardness gradient. The intermediate core layers is made of a thermoset or thermoplastic composition. The outer core layer is made of a highly neutralized polymer composition. The inner cover is made of a thermoplastic composition, preferably an ethylene acid copolymer. The outer cover is made of a composition comprising a polyurethane, polyurea, or copolymer or blend thereof. The finished ball has high resiliency and rebounding properties.

主权项

1. A golf ball consisting essentially of:
an inner core layer formed from a thermoset rubber composition and having a diameter of 1.100 inches to 1.400 inches, a center hardness (Hcenter material) of 50 Shore C or greater, and an outer surface hardness (Hcenter surface) of 65 Shore C or greater, wherein the Hcenter surface is greater than the Hcenter material to provide a positive hardness gradient; an intermediate core layer formed from a thermoset or thermoplastic composition having a material hardness (Hintermediate core material) of 83 Shore C or greater and an outer surface hardness (Hintermediate core surface) of 85 Shore C or greater; an outer core layer formed from a highly neutralized polymer composition and having a material hardness (Houter core material) of 70 Shore C or greater and an outer surface hardness (Houter core surface) of 70 Shore C or greater; an inner cover layer formed from a thermoplastic composition having a material hardness (Hinner cover material) of 80 Shore C to 95 Shore C, wherein Hintermediate core material is greater than Hinner cover material; and an outer cover layer formed from a composition comprising a material selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof.