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Multi-layer core golf ball

  • US 9,597,553 B2
  • Filed: 11/20/2015
  • Issued: 03/21/2017
  • Est. Priority Date: 01/10/2008
  • Status: Active Grant
First Claim
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1. A golf ball comprising:

  • an inner core layer formed from a first thermoset rubber composition and having a diameter of from 0.500 inches to 1.580 inches and a positive hardness gradient wherein the difference between the center hardness and the surface hardness of the inner core layer is from 10 to 45 Shore C units;

    a first intermediate core layer formed from a thermoplastic composition selected from the group consisting of partially- and fully-neutralized ionomers optionally blended with a maleic anhydride-grafted non-ionomeric polymer, polyesters, polyethers, polyamides, and blends of two or more thereof, and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of from 50 Shore C to 85 Shore C;

    a second intermediate core layer formed from a highly neutralized polymer composition and having a thickness of from 0.005 inches to 0.100 inches;

    an outer core layer formed from a second thermoset rubber composition and having a thickness of from 0.010 inches to 0.100 inches and a surface hardness of 50 Shore C or greater; and

    a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 65 Shore D or less.

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