Patent ID: 9132319
Filing Date: 2015-09-15
Classification: A63B,B32B,C08L

Abstract:
1. A golf ball, comprising: a) an inner core formed from a first the thermoplastic ionomer composition comprising an ethylene acid copolymer and containing acid groups such that 70% or less of the acid groups are neutralized; b) an outer core layer formed from a second ionomer composition comprising an ethylene acid copolymer and containing acid groups such that greater than 70% of the acid groups are neutralized; wherein the center of the inner core has a hardness in the range of 30 to 65 Shore D and the surface of the inner core has a surface hardness in the range of 40 to 75 Shore D, and the outer core layer has a surface hardness in the range of 50 to 90 Shore D, the inner core and outer core layer each having a positive hardness gradient, and wherein the surface hardness of the outer core layer is greater than the center hardness of the inner core, and wherein the first ionomer composition has a flex modulus of 50,000 psi and the second ionomer composition has a flex modulus in the range of 55,000 to 150,000 psi; and c) a cover having at least one layer.