Patent ID: 9433828
Filing Date: 2016-09-06
CPC Classification: A63B,C08K,C08L

Claim Text:
1. A golf ball comprising: an inner core layer comprising a thermoplastic highly neutralized polymer composition and having a geometric center hardness less than a surface hardness to define a positive hardness gradient; an outer core layer disposed about the inner core, the outer core comprising a thermoset rubber composition and having an inner surface hardness less than an outer surface hardness to define a positive hardness gradient; and a cover layer disposed about the outer core layer, the cover layer comprising an inner cover layer and an outer cover layer; wherein the highly neutralized polymer composition comprises an acid copolymer of ethylene and an α,β-unsaturated carboxylic acid; a non-acid polymer comprising ethylene-n-butyl acrylate present in an amount of about 20 wt % or greater based on the total weight of the highly neutralized polymer composition, or functionalized derivatives thereof; an organic acid or salt thereof; and a cation source present in an amount sufficient to neutralize at least about 80% of the acid groups present in the composition.