Multi-layer golf ball

摘要

Golf balls consisting of a dual core and a dual cover are disclosed. The surface hardness of the outer core layer is greater than the material hardness of the inner cover layer, and is preferably 75 Shore C or greater.

主权项

1. A golf ball consisting essentially of:
a center formed from a first rubber composition and having a diameter of from 0.75 inches to 1.19 inches, a center hardness of 65 Shore C or greater, and a surface hardness of 80 Shore C or greater; an outer core layer formed from a second rubber composition and having a surface hardness of 85 Shore C or greater; an inner cover layer formed from a thermoplastic composition and having a material hardness of less than 95 Shore C; and an outer cover layer formed from a thermosetting polyurethane or polyurea composition; wherein the surface hardness of the center is at least 10 Shore C units greater than the center hardness; wherein the surface hardness of the outer core layer is at least 20 Shore C units greater than the center hardness; and wherein the surface hardness of the outer core layer is greater than the material hardness of the inner cover layer.