Patent ID: 6899641

Claim:
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 that the 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/cm 3 , the core has a specific gravity of 1.05 to 1.20 g/cm 3 , 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 intermediate layer at its surface, and the outer layer at its surface have hardness satisfying: (core surface JIS-C hardness)−(core center JIS-C hardness)]≧16, [(intermediate layer surface JIS-C hardness)−(core surface JIS-C hardness)]≧0, and −18≦[(outer layer surface Shore D hardness)−(intermediate layer surface Shore D hardness)]<0; wherein the outer layer is made of a polyurethane composition containing (C) a thermoplastic polyurethane and (D) an isocyanate mixture and said isocyanate mixture (D) is a mixture prepared by dispersing (d-1) a compound having as functional groups at least two isocyanate groups per molecule in (d-2) a thermoplastic resin that is substantially non-reactive with isocyanate.