Patent ID: 6561929
Filing Date: 2003-05-13
Classification: A63B

Abstract:
A two-piece golf ball comprising a core and a cover,wherein said core is made from a rubber composition containing a base rubber to which an organic sulfur compound is mixed in an amount of 0.05 part by mass or more on the basis of 100 parts by mass of said base rubber; the JIS-C hardness, measured by a JIS-C hardness tester, of the center of said core is in a range of 40 to 60 and the JIS-C hardness of the surface of said core is in a range of 70 to 85, and further, a difference in JIS-C hardness between the core surface and the core center (hardness of core surfaceâˆ’hardness of core center) is in a range of 20 to 27; the compressive deformation amount, which is measured by applying, to said core, a load from an initial load of 10 kgf (98.07 N) to a final load of 130 kgf (1274.91 N), is in a range of 3.8 to 4.6 mm; and wherein said cover is made from a material containing a main resin to which an inorganic granular filler is mixed as a reinforcing material in an amount of 11 parts by mass or more on the basis of 100 parts by mass of said main resin, and the thickness of said cover is in a range of 1.8 to 2.3 mm.