Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsAkira KIMURA, Toru OGAWANA, Katsunobu MOCHIZUKI, Jun SHINDO
Life of this patent
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Abstract
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 a lower alcohol having a molecular weight below 200. 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.
Claims11
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 the core is formed of a rubber composition containing the following ingredients (a) to (d):
- (a) a base rubber,
- (b) a co-crosslinking agent which is an α,β-unsaturated carboxylic acid or a metal salt thereof or both,
- (c) a crosslinking initiator, and
- (d) a lower alcohol having a molecular weight below 200;
- and,
- letting Hc be the JIS-C hardness at a 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 a surface of the core, the core has a hardness profile which satisfies formulas (3) and (4) below
- (Ho−H12)−(H12−Hc)≥0 (3)
- 22≤Ho−Hc≤40 (4).
Dependencies are inferred from the claim text.