Importance

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Abstract

A thermoplastic multi-layer golf ball has a core center including a first thermoplastic material and having a diameter of from about 7 mm to about 20 mm and a surface Shore D hardness H1 of from about 30 to about 48; a core layer outward from the core center, the core layer including a second thermoplastic material and having a diameter of from about 25 mm to about 40 mm, a thickness of from about 7 mm to about 10 mm, a surface Shore D hardness H2 that is greater than H1, and a 10-130 kg compression deformation of from about 2.6 mm to about 3.2 mm; an inner cover layer outward from the core layer, the inner cover layer including a third thermoplastic material and having a surface Shore D hardness H3 of from about 55 to about 70; and an outer cover layer on the surface of the golf ball including a fourth thermoplastic material and having a surface Shore D hardness H4 of from about 44 to about 56 and a 10-130 kg compression deformation of from about 2.3 mm to about 3.2 mm. The difference between the specific gravity of the core center and the specific gravity of the core layer is not more than about 0.5 g/cm³.

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First Claim