Patent ID: 8399549

Claim:
A golf ball comprising a core and a cover and optionally at least one intermediate layer positioned between the core and the cover, wherein the core or an intermediate layer when present comprises a thermoplastic composition and the thermoplastic composition comprises or is prepared from: (a) at least one aliphatic, monofunctional organic acid having 4 to 36 carbon atoms, wherein the longest carbon chain of the acid is optionally substituted with from one to three substituents independently selected from the group consisting of C 1 to C 8 alkyl groups; (b) at least one ethylene acid copolymer consisting essentially of copolymerized comonomers of ethylene, from about 12 to about 25 weight % of copolymerized comonomers of acrylic acid, and from about 0.5 to about 10 weight % of copolymerized comonomers of at least one C 3 to C 8 α,β ethylenically unsaturated carboxylic acid ester, based on the total weight of the ethylene acid copolymer, said at least one ethylene acid copolymer having a melt index from about 200 to about 600 g/10 minutes measured according to ASTM D1238 at 190° C. using a 2160 g weight; wherein the combined acid moieties of (a) and (b) are nominally neutralized to a level from about 120% to about 220%; and wherein the thermoplastic composition when formed into a sphere of 1.50 to 1.68 inches in diameter has a coefficient of restitution equal to or greater than 0.860, said coefficient of resilience being measured by firing the sphere at an initial velocity of 125 feet/second against a steel plate positioned 3 feet from the point where initial velocity is determined and dividing the velocity of rebound from the plate by the initial velocity and has a PGA compression greater than 110.