GOLF BALL HAVING A HOLLOW CENTER

摘要

A golf ball includes a thermoset spherical inner core shell layer having an outer surface, an inner surface, and an inner diameter to define a hollow center; a thermoset outer core layer formed about the shell layer; and an inner and outer cover layer formed about the outer core layer. The inner cover includes an ionomeric material and the outer cover layer includes a polyurea or a polyurethane having a hardness less than the inner cover layer. The hollow center has a diameter of about 0.51 to 1.1 inches, the shell layer has a surface hardness greater than an inner surface hardness by about 3 to 25 Shore C to define a first hardness gradient, and the outer core layer has a second hardness gradient different from the first.

主权项

1. A golf ball comprising a hollow core, the golf ball comprising:
a spherical inner core shell layer comprising a first thermoset rubber composition, the shell layer having an outer surface, an inner surface, and an inner diameter to define a hollow center; an outer core layer disposed about the shell layer, the outer core layer comprising a second thermoset material; an inner cover layer disposed about the outer core layer, the inner cover comprising an ionomeric material and having a first hardness; and an outer cover layer disposed about the inner cover layer, the outer cover comprising a polyurea or a polyurethane and having a second hardness less than the first; wherein the hollow center has a diameter of about 0.51 to 1.1 inches, the shell layer has a surface hardness greater than an inner surface hardness by about 3 to 25 Shore C to define a first hardness gradient, and the outer core layer has a second hardness gradient different from the first.