Multi-piece golf ball comprising low hardness gradient core

摘要

A golf ball includes a single core formed from a substantially homogenous rubber composition, an inner cover disposed about the core, and an outer cover. The inner cover includes an ionomeric material and has a hardness of about 60 Shore D or greater. The outer cover layer is disposed about the inner cover layer, is formed from a castable polyurea or polyurethane, and has a material hardness of about 60 Shore D or less. The outer surface of the core has a trans content of about 12% or less and a hardness of about 71 to 88 Shore C, the geometric center of the core has a trans content of about 10% or less and a hardness of about 70 to 80 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 10 Shore C to define a shallow positive hardness gradient.

主权项

1. A golf ball comprising:
a core having an outer surface and a geometric center and being formed from a substantially homogenous rubber composition; an intermediate layer disposed about the core, the intermediate layer comprising a non-ionomeric thermoplastic material and having a material hardness of about 60 Shore D or greater; and a cover layer disposed about the intermediate layer, the cover comprising a polyurea or a polyurethane and having a material hardness of about 60 Shore D or less; wherein the core outer surface has a trans content of about 12% or less and a hardness of about 71 to 88 Shore C, the geometric center has a trans content of about 10% or less and a hardness of about 70 to 80 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 10 Shore C to define a shallow positive hardness gradient.