THERMOPLASTIC MULTI-LAYER GOLF BALL

摘要

A thermoplastic multi-layer golf ball has a core center including a first thermoplastic material, a core layer including a second thermoplastic material, and a cover including a third thermoplastic material. The core center has a diameter of 21-29 mm and a surface Shore D hardness H1 of less than about 50. The core layer is at least about 5 mm thick with an outer surface Shore D hardness H2 of more than about 50. The cover has an outer surface Shore D hardness H3 of more than about 60. H3 is up to about 20 Shore D units higher than H2, and H2 is up to about 10 Shore D units higher than H1. The core layer has a specific gravity that is at least 0.1 g/cm3 greater than the specific gravity of the core center.

主权项

1. A golf ball, comprising:
a core center comprising a first thermoplastic material, wherein the core center has a diameter of from about 21 mm to about 29 mm and a surface Shore D hardness (H1) of less than about 50; a core layer disposed radially outward from the core center, wherein the core layer has a thickness of at least about 5 mm, a surface Shore D hardness (H2) of more than about 50, and comprises a second thermoplastic material; a cover disposed radially outward of the core layer, wherein the cover comprises a third thermoplastic material and has a surface Shore D hardness (H3) of more than about 60; wherein the cover surface hardness H3 is up to about 20 Shore D units higher than the core layer surface hardness H2, the core layer surface hardness H2 is up to about 10 Shore D units higher than the core center surface hardness H1, and the specific gravity of the core layer is at least 0.1 g/cm3 higher than the specific gravity of the core center.