Patent ID: 6994638

Claim:
A golf ball comprising: a core comprising a center and an outer core layer, the center comprising a thermoset polybutadiene rubber composition having a first hardness; and the outer core layer comprising a polymer comprised of an acid group fully-neutralized by an organic acid or a salt of the organic acid, and a cation source or a suitable base of the cation source; and having a second hardness; and an inner cover layer and an outer cover layer comprising ionomeric copolymers and terpolymers, ionomer precursors, thermoplastics, thermoplastic elastomers, polybutadiene rubber, balata, grafted metallocene-catalyzed polymers, non-grafted metallocene-catalyzed polymers, single-site polymers, high-crystalline acid polymers and their ionomers, polyurethnnes, polyureas, polyurethane-ureas; polyurea-urethanes; or cationic ionomers; wherein the first hardness is from about 50 Shore A to about 55 Shore D and first hardness is less than the second Shore D hardness by at least about 10 points.