Patent ID: 9492715
Filing Date: 2016-11-15
CPC Classification: A63B,C08K,C08L

Claim Text:
1. A golf ball comprising: an inner core layer; an outer core layer essentially enclosing the inner core layer; an inner cover layer essentially enclosing the outer core layer; and an outer cover layer essentially enclosing the inner cover layer, wherein the inner core layer includes a blend comprising a first highly neutralized acid polymer having a first Vicat softening temperature between about 50° C. and about 60° C. and a first specific gravity and a second highly neutralized acid polymer having a second Vicat softening temperature between about 40° C. and about 60° C. and a second specific gravity, wherein the absolute value of the difference between the Vicat softening temperatures is no more than about 2° C. and the absolute value of the difference between the specific gravities is no more than 0.005; wherein the outer core layer comprises polybutadiene rubber and is at least about 5 mm thick; wherein the inner cover layer comprises a first thermoplastic material and the outer cover layer comprises a second thermoplastic material, wherein said thermoplastic material of each of the inner cover layer and the outer cover layer independently comprises at least one of an ionomer resin, a polyamide resin, a polyurethane resin, and a polyester resin.