Golf balls comprising highly-neutralized acid polymers

  • US 6,994,638 B2
  • Filed: 05/05/2004
  • Issued: 02/07/2006
  • Est. Priority Date: 06/26/2001
  • Status: Active Grant
First Claim
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1. A golf ball comprising:

  • a core comprising a center and an outer core layer, the center comprising a thermoset polybutadiene rubber composition having a first hardness; and

    the outer core layer comprising a polymer comprised of an acid group fully-neutralized by an organic acid or a salt of the organic acid, and a cation source or a suitable base of the cation source; and

    having a second hardness; and

    an inner cover layer and an outer cover layer comprising ionomeric copolymers and terpolymers, ionomer precursors, thermoplastics, thermoplastic elastomers, polybutadiene rubber, balata, grafted metallocene-catalyzed polymers, non-grafted metallocene-catalyzed polymers, single-site polymers, high-crystalline acid polymers and their ionomers, polyurethnnes, polyureas, polyurethane-ureas;


    or cationic ionomers;

    wherein the first hardness is from about 50 Shore A to about 55 Shore D and first hardness is less than the second Shore D hardness by at least about 10 points.

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