Patent ID: 6702694
Filing Date: 2004-03-09
Classification: A63B

Abstract:
A multi-piece solid golf ball comprising a core, an intermediate layer enclosing the core, and an outer layer enclosing the intermediate layer, characterized in thatthe intermediate layer is made of a thermoplastic resin composition, the intermediate layer on its surface has a Shore D hardness of at least 57, the intermediate layer has a specific gravity of 1.00 to 1.30 g/cm3, the outer layer has a specific gravity of at least 1.00 g/cm3, the core has a specific gravity of 1.05 to 1.20 g/cm3, the intermediate layer and the outer layer have a total gauge of up to 3.3 mm, the core at its surface and center, the intermdediate layer at its surface, and the outer layer at its surface have hardness satisfying: [(core surface JIS-C hardness)âˆ’(core center JIS-C hardness)]&gE;16, [(intermediate layer surface JIS-C hardness)âˆ’(core surface JIS-C hardness)]&gE;0, and âˆ’18 &lE;[(outer layer surface Shore D hardness)âˆ’(intermediate layer surface Shore D hardness)]<0; wherein said thermoplastic resin composition comprises a thermoplastic resin and an inorganic particulate filler in a proportion of 100/5 to 100/25 by weight ratio.