Multi-piece solid golf ball
Abstract
Provided is a golf ball including a core, an intermediate layer, a cover, and dimples, in which letting a Shore C hardness of a core surface be H100, Shore C hardnesses at an 87.5% outer position, a 75% outer position, a 62.5% outer position, a 50% outer position, a 37.5% outer position, a 25% outer position, and a 12.5% outer position of a core radius from a core center be H87.5, H75, H62.5, H50, H37.5, H25, and H12.5, respectively, and a Shore C hardness at the core center be H0, the following two conditions are satisfied: 0 ≤ ( H 6 2.5 - H 50 ) < ( H 100 - H 87.5 ) < ( H 8 7.5 - H 75 ) < ( H 75 - H 62.5 ) ≤ 7. and ( H 100 - H 50 ) / ( H 50 - H 0 ) ≥ 2 . 7 and the golf ball has a specific dimple volume occupancy ratio.
Claims
exact text as granted — not AI-modified1 . A multi-piece solid golf ball comprising a core, an intermediate layer, and a cover, wherein a large number of dimples are formed on an outside surface of the cover, and in a hardness profile of the core, letting a Shore C hardness at a core surface be H100, a Shore C hardness at a position outside by 87.5% of a core radius from a core center be H87.5, a Shore C hardness at a position outside by 75% of the core radius from the core center be H75, a Shore C hardness at a position outside by 62.5% of the core radius from the core center be H62.5, a Shore C hardness at a position outside by 50% of the core radius from the core center be H50, a Shore C hardness at a position outside by 37.5% of the core radius from the core center be H37.5, a Shore C hardness at a position outside by 25% of the core radius from the core center be H25, a Shore C hardness at a position outside by 12.5% of the core radius from the core center be H12.5, and the Shore C hardness at the core center be H0, the following two conditions are satisfied:
0
≤
(
H
6
2.5
-
H
50
)
<
(
H
100
-
H
87.5
)
<
(
H
8
7.5
-
H
75
)
<
(
H
75
-
H
62.5
)
≤
7.
,
and
(
H
100
-
H
50
)
/
(
H
50
-
H
0
)
≥
2
.
7
and the dimple has a volume occupancy ratio VR of from 0.75 to 0.89%.
2 . The multi-piece solid golf ball of claim 1 , wherein when a ratio CL1/CD1 of a lift coefficient CL1 at a Reynolds number of 218,000 and a spin rate of 2,300 rpm to a drag coefficient CD1 is denoted by A1, and a ratio CL2/CD2 of a lift coefficient CL2 at a Reynolds number of 158,000 and a spin rate of 3,100 rpm to a drag coefficient CD2 is denoted by A2, the following two conditions are satisfied:
0.53
≤
A
1
≤
0
.
6
00
,
and
0.695
≤
A
2.
3 . The multi-piece solid golf ball of claim 1 , wherein the following condition is satisfied:
(
H
100
-
H
87.5
)
/
(
H
87.5
-
H
75
)
≤
0
.
9
0
.
4 . The multi-piece solid golf ball of claim 1 , wherein values of the following eight conditions are all positive values:
H
100
-
H
87.5
,
H
87.5
-
H
75
,
H
75
-
H
62.5
,
H
62.5
-
H
50
,
H
50
-
H
37.5
,
H
37.5
-
H
25
,
H
25
-
H
12.5
,
and
H
12.5
-
H
0.
5 . The multi-piece solid golf ball of claim 1 , wherein the core is formed of a rubber composition including the following components (a) to (e):
(a) a base rubber, (b) an α,β-unsaturated carboxylic acid and/or a metal salt thereof as a co-crosslinking agent, (c) an organic peroxide, (d) water or a moisture-providing agent, and (e) a hindered phenol-based antioxidant having a substituent having a thioether structure, the moisture-providing agent being a substance that contains a water component other than free water in a structure thereof and desorbs moisture by heating, or a substance that releases a water component by thermal decomposition by heating, a compounding amount of the component (e) being at least 0.2 parts by weight per 100 parts by weight of the component (a).
6 . The multi-piece solid golf ball of claim 5 , wherein the hindered phenol-based antioxidant serving as component (e) has a chemical structure having at least one methyl group at an ortho position.
7 . The multi-piece solid golf ball of claim 5 , wherein the hindered phenol-based antioxidant serving as component (e) has at least two substituents having a thioether structure.
8 . The multi-piece solid golf ball of claim 1 , wherein a deflection when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is not more than 3.8 mm.
9 . The multi-piece solid golf ball of claim 1 , wherein when a deflection when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is A (mm), and a deflection when the golf ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is B (mm), a value of A−B is less than 1.0 mm.
10 . The multi-piece solid golf ball of claim 1 , wherein a relationship between a surface hardness of a sphere (intermediate layer-encased sphere) obtained by encasing the core with the intermediate layer and a surface hardness of the ball satisfies the following condition:
(
Shore
D
hardness
of
surface
of
intermediate
layer
-
encased
sphere
)
-
(
Shore
D
hardness
of
surface
of
ball
)
≥
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