Patent ID: 8727912
Filing Date: 2014-05-20
Classification: A63B

Abstract:
1. A golf ball comprising: a core comprising a thermoplastic inner core and a thermoset outer core layer, the inner core having a surface hardness of 40 to 65 Shore D and a center hardness of 30 Shore D to 55 Shore D and is less than the surface hardness to define a first positive hardness gradient; and a cover comprising an inner cover layer and an outer cover layer; wherein the thermoplastic inner core comprises a highly-neutralized ionomer comprising a copolymer of ethylene and an α,β-unsaturated carboxylic acid, an organic acid or salt thereof, and sufficient cation source to neutralize the acid groups of the copolymer by 80% or greater, and the outer core layer comprises a polybutadiene rubber and has a surface hardness greater than an interior hardness to define a positive hardness gradient of less than 25 Shore C.