Patent ID: 7048649
Filing Date: 2006-05-23
Classification: A63B

Abstract:
1. A solid multi-piece golf ball comprising a solid core, a mantle of at least one layer enclosing the solid core, and a cover of at least one layer enclosing the mantle, wherein the mantle is made of a material composed primarily of a thermoplastic elastomer selected from the group consisting of polyester, polyamide, polyolefin, and polystyrene, and has a thickness of up to 1.5 mm, the mantle and the solid core have a compression ratio, defined as (compression of mantle)/(compression of solid core), of at least 0.98, the compression being the amount of deformation when subjected to a load of 1,275 N from an initial load of 98 N, and the solid core has a compression of 3.2 to 4.5 mm and has a surface and a center with a difference in JIS-C hardness therebetween, defined as (surface hardness−center hardness), of at least 5, and the cover is made of a material composed primarily of a thermoplastic resin having a Shore D hardness of 60 to 68.