Patent ID: 7140979
Filing Date: 2006-11-28
Classification: A63B

Abstract:
1. A three-piece solid golf ball, having a solid core, an intermediate layer enclosing said solid core, and a cover layer enclosing said intermediate layer and having a large number of dimples formed in its surface, characterized in that the core deforms as much as 3.4 to 4.1 mm under a load which changes from 10 kg to 130 kg, the intermediate layer has a surface hardness of 64 to 69 in terms of Shore D hardness, the cover layer is formed mainly from thermoplastic polyurethane such that it has a lower hardness than said intermediate layer, with the difference in hardness between the cover layer and the intermediate layer being 10 to 16 in terms of Shore D hardness, the intermediate layer and the cover layer have a total thickness of 2.2 to 3.0 mm, the cover layer has a thickness of 0.8 to 1.3 mm, and the dimples have at least four different diameters and/or depths, with the average depth being 0.14 to 0.17 mm, and amount to 250 to 390 in all, wherein the intermediate layer is formed mainly from an ionomer resin and is compounded with a ternary composite material composed of rubber component, polyolefin component, and polyamide component.