Golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsTakashi Sasaki, Takahiro Sajima
Life of this patent
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Abstract
A golf ball containing a core and a cover, the core being composed of a center and a mid layer. Numerous dimples are formed on the surface of the cover. The cover includes a thermoplastic polyurethane elastomer as a principal component. The Shore D hardness of the cover is 30 or greater and 55 or less. The surface area occupation ratio Y of the dimples is equal to or greater than 75%. A ratio R1 of the diameter dmax of the maximum dimple to the diameter D of the golf ball is 11.0% or greater and 18.0% or less. A ratio R2 of the number of dimples having the diameter d accounting for 11.0% or greater and 18.0% or less of the diameter D of the golf ball to the total number N of the dimples is equal to or greater than 20%.
Claims4
A golf ball which comprises a core, a cover and numerous dimples formed on the surface of said cover,
- wherein a base polymer of said cover includes a thermoplastic polyurethane elastomer as a principal component,
- Shore D hardness of said cover is 30 or greater and 55 or less,
- a surface area occupation ratio Y of these dimples is equal to or greater than 75%,
- a ratio R1 of the diameter dmax of the maximum dimple to the diameter D of said golf ball is 13.0% or greater and 18.0% or less, and
- a ratio R2 of the number of dimples having the diameter d accounting for 13.0% or greater and 18.0% or less of said diameter D of the golf ball, to the total number N of the dimples is equal to or greater than 20%.
Dependencies are inferred from the claim text.