Thermoplastic dual core having positive hardness gradient inner and outer core layers
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United States of America Patent
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Jan 23, 2018
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app pub date -
Dec 22, 2015
filing date -
Nov 14, 2007
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Abstract
A golf ball includes an inner core layer including a thermoplastic highly-neutralized ionomer formed from 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. The inner core has a geometric center hardness and a surface hardness to define a first positive hardness gradient having a first slope, S1. An outer core layer is disposed about the inner core and is formed from a second thermoplastic highly-neutralized ionomer. The outer core layer has an interior hardness and an outer surface hardness greater than the interior hardness to define a second positive hardness gradient having a second slope, S2. The golf ball also includes a cover layer.
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