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Golf Balls Having a Low Modulus HNP Layer and a High Modulus HNP Layer

  • US 20080242448A1
  • Filed: 05/22/2008
  • Published: 10/02/2008
  • Est. Priority Date: 03/30/2007
  • 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 1.60 inches and consists of:

  • (a) a center having a diameter of from 0.50 inches to 1.50 inches and a center hardness (H) of from 20 Shore C to 70 Shore C;

    (b) an intermediate core layer having a surface hardness (I) of 40 Shore C or greater and formed from a high modulus HNP composition, the high modulus HNP composition comprising a highly neutralized ethylene/(meth)acrylic acid copolymer having a modulus of from 25,000 psi to 150,000 psi; and

    (c) an outer core layer having a surface hardness (S) of from 20 Shore C to 70 Shore C and formed from a low modulus HNP composition, the low modulus HNP composition comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer having a modulus of from 1,000 psi to 50,000 psi;

    wherein H<

    I and S<

    I, andwherein the modulus of the highly neutralized copolymer of the low modulus HNP composition is at least 10% less than the modulus of the highly neutralized copolymer of the high modulus HNP composition.

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