Golf ball
AssigneeSRI Sports Limited
InventorsHirotaka Nakamura, Keiji Ohama
Life of this patent
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Abstract
A golf ball 2 has a hollow center 8, a mid layer 10, an inner cover 12 and an outer cover 14. The center 8 is formed by crosslinking a rubber composition. The rubber composition contains a natural rubber as a base polymer. The rubber composition contains sulfur. The mid layer 10 is formed by crosslinking a rubber composition. This rubber composition includes butadiene as a principal component of the base polymer. The center 8 has an inside diameter of 2 mm or greater and 13 mm or less. The center 8 has an outside diameter of 5 mm or greater and 15 mm or less. The center 8 has a surface JIS-C hardness H2 of 25 or greater and 55 or less. A difference (H4−H3) between a surface JIS-C hardness H4 of the mid layer 10 and a JIS-C hardness H3 of an innermost part of the mid layer is equal to or greater than 10.
Claims20
A golf ball comprising a core and a cover positioned outside the core, wherein;
- the core has a center and a mid layer positioned outside the center, and a hollow space is located within the center,
- the center has an inside diameter of 2 mm or greater and 13 mm or less,
- the center has an outside diameter of 5 mm or greater and 15 mm or less,
- a JIS-C hardness H2 of a surface of the center is 25 or greater and 55 or less, and
- a difference (H4−H3) between a JIS-C hardness H4 of a surface of the core and a JIS-C hardness H3 of an innermost part of the mid layer is equal to or greater than 10.
Dependencies are inferred from the claim text.