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US 2021/0220705 A1Published application
Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsAkira KIMURA, Toru Ogawana, Katsunobu Mochizuki, Jun Shindo
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AssigneeBridgestone Sports Co., Ltd.
InventorsAkira KIMURA, Toru Ogawana, Katsunobu Mochizuki, Jun Shindo
Estimating the term…
In order to satisfy at a high level the golf ball flight and control performances relied on by professional golfers and skilled amateurs, this invention provides a multi-piece solid golf ball G having a core 1, a cover 3 and an intermediate layer 2 therebetween wherein the core is formed of a rubber composition that includes an alcohol having a value obtained by dividing the molecular weight of the alcohol by the number of hydroxyl groups thereon which is 70 or less. Also, letting Hc be the JIS-C hardness at the center of the core, H12 be the JIS-C hardness at a position 12 mm from the core center and Ho be the JIS-C hardness at the surface of the core, the core has a hardness profile in which these hardnesses satisfy fixed relationships defined by specific formulas.
A multi-piece solid golf ball comprising a core, a cover, and an intermediate layer situated therebetween and having a paint film layer formed on a surface of the cover, wherein letting Hc be the JIS-C hardness at a center of the core, H10 be the JIS-C hardness at a position 10 mm from the core center, H12 be the JIS-C hardness at a position 12 mm from the core center and Ho be the JIS-C hardness at a surface of the core, the core has a hardness profile which satisfies formulas (2)′, (3) and (3)′ below
Dependencies are inferred from the claim text.