Multi-piece solid golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsKeiji Ohama, Seiichiro Endo
Life of this patent
Estimating the term…
Abstract
The present invention provides a multi-piece solid golf ball having good shot feel, excellent durability and excellent flight performance. The present invention relates to a multi-piece solid golf ball comprising a core having at least one layer, an inner cover formed on the core and an outer cover formed on the inner cover, of which the outer cover has many dimples on the surface thereof, wherein a surface hardness in JIS-C hardness of the core is higher than a center hardness in JIS-C hardness of the core by less than 5, the inner cover has a hardness in Shore D hardness of less than 53 and the hardness of the inner cover is higher than the surface hardness of the core, and a hardness of the outer cover is higher than that of the inner cover.
Claims16
A multi-piece solid golf ball comprising a core having at least one layer, an inner cover formed on the core and an outer cover formed on the inner cover, of which the outer cover has many dimples on the surface thereof, wherein
- a surface hardness in JIS-C hardness of the core is higher than a center hardness in JIS-C hardness of the core by less than 5,
- the inner cover has a hardness in Shore D hardness of less than 53 and the hardness of the inner cover is higher than the surface hardness of the core, and
- a hardness of the outer cover is higher that that of the inner cover,
- wherein the core has a deformation amount of 3.0 to 5.0 mm, when applying from an initial load of 98 N to a final load of 1274 N,
- wherein the golf ball has a total volume of the dimples of 260 to 400 mm3, and
- wherein the inner cover comprises 5 to 45 parts by weight of thermoplastic elastomer, based on 100 parts by weight of the base resin.
A multi-piece solid golf ball comprising a core having at least one layer, an inner cover formed on the core and an outer cover formed on the inner cover, of which the outer cover has many dimples on the surface thereof, wherein
- a surface hardness in JIS-C hardness of the core is higher than a center hardness in JIS-C hardness of the core by less than 5,
- the inner cover has a hardness in Shore D hardness of less than 53 and the hardness of the inner cover is higher than the surface hardness of the core, and
- a hardness of the outer cover is higher than that of the inner cover,
- wherein the core has a deformation amount of 3.0 to 5.0 mm, when applying from an initial load of 98 N to a final load of 1274 N,
- wherein the golf ball has a total volume of the dimples of 260 to 400 mm3, and
- wherein that core is made of a rubber composition comprising an organic sulfide compound which is at least one of a thiophenol and a disulfide.
A multi-piece solid golf ball comprising a core having at least one layer, an inner cover formed on the core and an outer cover formed on the inner cover, of which the outer cover has many dimples on the surface thereof, wherein
- a surface hardness in JIS-C hardness of the core is higher than a center hardness in JIS-C hardness of the core by less than 5,
- the inner cover has a hardness in Shore D hardness of less than 53 and the hardness of the inner cover is higher than the surface hardness of the core, and
- a hardness of the outer cover is higher than that of the inner cover,
- wherein the core has a deformation amount of 3.0 to 5.0 mm, when applying from an initial load of 98 N to a final load of 1274 N,
- wherein the golf ball has a total volume of the dimples of 260 to 400 mm3, and
- wherein the core is made of a rubber composition comprising a polybutadiene and a co-crosslinking agent and the co-crosslinking agent is added in an amount of 15-30 parts by weight based on 100 parts by weight of a polybutadiene.
Dependencies are inferred from the claim text.