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Highly-neutralized thermoplastic copolymer center for improved multi-layer core golf ball

  • US 7,652,086 B2
  • Filed: 02/03/2006
  • Issued: 01/26/2010
  • Est. Priority Date: 06/26/2001
  • Status: Expired due to Term
First Claim
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1. A golf ball comprising:

  • a center comprising a highly-neutralized thermoplastic copolymer of ethylene and an α



    -unsaturated carboxylic acid, the acid being 100% neutralized by a salt of an organic acid and a cation source;

    a cover; and

    an intermediate layer disposed between the center and the cover;

    wherein the golf ball has a first coefficient of restitution of 0.81 or greater when measured at an incoming velocity of 125 ft/s and a second coefficient of restitution of 0.76 or greater when measured at an incoming velocity of 160 ft/s; and

    a sphere resulting from a combination of the center and the intermediate layer has a compression of 60 or greater; and

    wherein the center has a diameter of from 0.80 inches to 1.40 inches and a compression of 30 or less, and the intermediate layer has flexural modulus of 50,000 psi to 70,000 psi and a thickness of 0.110 inches to 0.180 inches, and the cover comprises thermoset polyurea or hybrid thereof having a hardness of from 45 Shore D to 60 Shore D and a thickness from 0.020 inches to 0.040 inches.

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