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Golf balls having at least two core layers formed from HNP compositions

  • US 10,300,343 B2
  • Filed: 04/16/2018
  • Issued: 05/28/2019
  • Est. Priority Date: 12/15/2005
  • Status: Active Grant
First Claim
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1. A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.62 inches and consists of:

  • (a) a center having a diameter of from 0.125 inches to 0.750 inches;

    (b) an intermediate core layer formed from a first highly neutralized polymer composition; and

    (c) an outer core layer formed from a second highly neutralized polymer composition;

    wherein the material hardness of the first highly neutralized polymer composition is less than the material hardness of the second highly neutralized polymer composition;

    wherein the intermediate core layer has a surface hardness less than the surface hardness of the center and the surface hardness of the outer core layer; and

    wherein at least one of the first highly neutralized polymer composition and the second highly neutralized polymer composition comprises;

    an acid copolymer of ethylene and an α



    -unsaturated carboxylic acid;

    an alkyl acrylate rubber selected from ethylene-alkyl acrylates and ethylene-alkyl methacrylates;

    magnesium oleate present in an amount of 20 parts or greater per 100 parts of acid copolymer and akyl acrylate rubber combined; and

    a cation source present in an amount sufficient to neutralize 110% or greater of all acid groups present in the composition.

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