Patent ID: 6155935
Filing Date: 2000-12-05
Classification: A63B

Abstract:
A golf ball comprising a core of at least one layer, an intermediate layer around the core, and a cover of at least one layer around the intermediate layer, whereinthe core is formed primarily of polybutadiene rubber,the intermediate layer is formed primarily of a resin having an Izod impact strength of at least 50 J/m and provided on its outer surface with a plurality of recesses,the cover is provided on its inner surface with a corresponding plurality of inwardly extending protrusions fit in the recesses in the intermediate layer, a cross section of the protrusions at their base having a size which is smaller than the thickness of said intermediate layer, andthe cover is formed primarily of a resin having a Shore D hardness and a melting point, the Shore D hardness of the cover-forming resin is at least 8 units higher than the Shore D hardness of the intermediate layer-forming resin, and the melting point of the cover-forming resin is lower than the melting point of the intermediate layer-forming resin.