Patent ID: 8337332
Filing Date: 2012-12-25
Classification: A63B

Abstract:
1. A golf ball comprising: an inner core layer formed from a first thermoset rubber composition and having a diameter of from 1.000 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 first thermoplastic composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of greater than 60 Shore D; a second intermediate core layer formed from a second thermoplastic 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; wherein one or more of the inner core layer, the first intermediate core layer, the second intermediate core layer, and the outer core layer has a specific gravity of greater than 1.25 g/cc; 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.