Patent ID: 7320649

Claim:
A golf ball comprising a core, an intermediate layer, and a cover, wherein the intermediate layer is formed from a composition comprising: an ionomer resin; a rosin material, wherein the rosin material has at least one of an acid number of about 1 to about 30, an iodine number from about 10 to about 200, a density of about 5 lbs/gal to about 20 lbs/gal, or a softening point of at least about 50° C.; and an impact modifier selected from the group consisting of alkyl acrylate-based block copolymers, hydrogenated derivatives of alkyl acrylate-based block copolymers, vinyl aromatic monomers, or mixtures thereof; acrylate-based block copolymers; silicone-acrylate impact modifiers; thiokol rubber, polysulfide rubber, polyurethane rubber, polyether rubber, epichlorohydrin rubber, ethylene-propylene rubber, thermoplastic polyester elastomers, thermoplastic ether-ester and ether-amide elastomers, and combinations thereof.