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Multi-layer core golf ball

  • US 7,955,191 B2
  • Filed: 04/15/2009
  • Issued: 06/07/2011
  • 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, a center hardness of from 40 Shore C to 65 Shore C, and a surface hardness of from 50 Shore C to 85 Shore C;

    a first intermediate core layer formed from a second thermoset rubber composition and having an outer diameter of from 1.200 inches to 1.620 inches and a surface hardness of from 80 Shore C to 95 Shore C;

    a second intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of greater than 50 Shore D;

    an outer core layer formed from a third 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;

    wherein the surface hardness of the first intermediate core layer is greater than the surface hardness of the inner core layer; and

    wherein the inner core layer has 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.

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