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GOLF BALL HAVING A THERMOPLASTIC POSITIVE HARDNESS GRADIENT INNER CORE LAYER AND A THERMOSET SHALLOW POSITIVE HARDNESS GRADIENT OUTER CORE LAYER

  • US 20120122610A1
  • Filed: 12/22/2011
  • Published: 05/17/2012
  • Est. Priority Date: 11/14/2007
  • Status: Active Grant
First Claim
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1. A golf ball comprising:

  • an inner core layer comprising a thermoplastic highly-neutralized ionomer comprising a copolymer of ethylene and an α



    -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 having a geometric center hardness less than a surface hardness to define a first positive hardness gradient;

    an outer core layer disposed about the inner core, the outer core being formed from a homogenous thermoset composition and having an interior hardness less than an outer surface hardness to define a second positive hardness gradient;

    an inner cover layer disposed about outer core layer; and

    an outer cover layer disposed about the inner cover layer,wherein the first and second hardness gradients each have a slope and the slope of the second hardness gradient is less than the slope of the first hardness gradient such that a ratio of the first and second slopes is 0.8 to 0.85.

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