Golf ball
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United States of America Patent
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May 14, 2019
Grant Date -
Dec 5, 2013
app pub date -
Apr 29, 2013
filing date -
May 30, 2012
priority date (Note) -
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Abstract
A golf ball 2 includes a core 4, a first mid layer 6, a second mid layer 8, and a cover 12. The core 4 includes a center 18 and an envelope layer 20. The center 18 is formed by crosslinking a first rubber composition, and the envelope layer 20 is formed by crosslinking a second rubber composition. The first rubber composition or the second rubber composition includes a base rubber, a co-crosslinking agent, a crosslinking initiator, and an acid and/or a salt. The co-crosslinking agent is:
- (1) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; and/or(2) a metal salt of an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms.A hardness Hm2 of the second mid layer 8 is greater than a hardness Hm1 of the first mid layer 6. The hardness Hm2 is greater than a hardness Hc of the cover 12.
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