US2025303238A1PendingUtilityA1
Golf ball
Est. expiryMar 27, 2044(~17.7 yrs left)· nominal 20-yr term from priority
Inventors:Hideo Watanabe
A63B 37/0092A63B 37/0076A63B 37/0075A63B 37/0039A63B 37/0084A63B 37/0066A63B 37/0035A63B 37/0063A63B 37/00622A63B 37/00922A63B 37/0047
62
PatentIndex Score
0
Cited by
0
References
0
Claims
Abstract
A golf ball includes a core and a cover, in which the core is formed of a rubber composition in a single layer, the cover is formed of a resin composition, a hardness profile of the core has a specific cross-sectional hardness profile, and letting a deflection (mm) when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) be C (mm), a Shore C hardness at a core center be H0, and a Shore C hardness at a core surface be H100, the following condition is satisfied:C×(H100-H0)≥125.0.
Claims
exact text as granted — not AI-modified1 . A golf ball comprising a core and a cover, the core being formed of a rubber composition in a single layer, and the cover being formed of a resin composition, wherein in a hardness profile of the core, letting a Shore C hardness at a core center be H 0 , a Shore C hardness at a position where a distance from the core center is 12.5% of a core radius be H 12.5 , a Shore C hardness at a position where the distance from the core center is 25% of the core radius be H 25 , a Shore C hardness at a position where the distance from the core center is 37.5% of the core radius be H 37.5 , a Shore C hardness at a position where the distance from the core center is 50% of the core radius be H 50 , a Shore C hardness at a position where the distance from the core center is 62.5% of the core radius be H 62.5 , a Shore C hardness at a position where the distance from the core center is 75% of the core radius be H 75 , a Shore C hardness at a position where the distance from the core center is 87.5% of the core radius be H 87.5 , and a shore C hardness at a core surface be H 100 , and defining differences in hardness between the respective positions as follows:
A: H 100 −H 87.5 B: H 87.5 −H 75 C: H 75 −H 62.5 D: H 62.5 −H 50 E: H 50 −H 37.5 F: H 37.5 −H 25 G: H 25 −H 12.5 H: H 12.5 −H 0 the following two conditions (I) and (II) are satisfied:
(
E
+
F
+
G
+
H
)
<
(
C
+
D
)
(
I
)
(
H
100
-
H
0
)
≥
3
0
.
0
(
II
)
and letting a deflection (mm) when the core is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) be C (mm), the following condition is satisfied:
C
×
(
H
100
-
H
0
)
≥
1
2
5.
.
(
III
)
2 . The golf ball of claim 1 , wherein the following condition (IV) is satisfied:
(
E
+
F
+
G
+
H
)
<
(
A
+
B
)
.
(
IV
)
3 . The golf ball of claim 1 , wherein the following condition (V) is satisfied:
(
E
+
F
+
G
+
H
)
<
(
C
+
D
)
<
(
A
+
B
)
.
(
V
)
4 . The golf ball of claim 1 , wherein the following condition (VI) is satisfied:
{
(
C
+
D
)
-
(
E
+
F
+
G
+
H
)
}
≥
3
.
0
.
(
VI
)
5 . The golf ball of claim 1 , wherein the following condition (VII) is satisfied:
{
(
H
100
-
H
0
)
/
(
H
5
0
-
H
0
)
}
≥
5.
.
(
VII
)
6 . The golf ball of claim 1 , wherein the following condition (VIII) is satisfied:
{
(
H
87.5
-
H
0
)
/
(
H
5
0
-
H
0
)
}
≥
3.
.
(
VIII
)
7 . The golf ball of claim 1 , wherein the core is formed of a rubber composition containing the following components (A) to (D):
(A) a base rubber, (B) an organic peroxide, (C) water or a monocarboxylic acid metal salt, (D) sulfur.
8 . The golf ball of claim 7 , wherein a content ratio of the components (D) and (C) is from 0.005 to 0.100 in a weight ratio of (D)/(C).
9 . The golf ball of claim 1 , wherein an intermediate layer is formed between the core and the cover.
10 . The golf ball of claim 9 , wherein the intermediate layer contains an inorganic particulate filler.
11 . The golf ball of claim 9 , wherein a specific gravity of the intermediate layer is at least 1.05.
12 . The golf ball of claim 1 , wherein, letting a deflection (mm) when the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) be B (mm), the following two conditions are satisfied:
B≥ 2.80 C - B≥ 1.00.
13 . The golf ball of claim 9 , wherein a relationship between a core surface hardness, a surface hardness of a sphere (intermediate layer-encased sphere) in which the core is encased with the intermediate layer, and a surface hardness of a sphere (ball) in which the intermediate layer-encased sphere is encased with the cover satisfies the following condition:
ball surface hardness<surface hardness of intermediate layer-encased sphere>core surface hardness where the surface hardness of each sphere means Shore C hardness.
14 . The golf ball of claim 9 , wherein a difference between a specific gravity of the cover and a specific gravity of the intermediate layer is not more than 0.15, and a difference between the specific gravity of the intermediate layer and a specific gravity of the core is not more than 0.15.
15 . The golf ball of claim 9 , wherein a relationship between an initial velocity of the entire core, an initial velocity of a sphere (intermediate layer-encased sphere) in which the core is encased with the intermediate layer, and an initial velocity of a sphere (ball) in which the intermediate layer-encased sphere is encased with the cover satisfies the following two conditions:
(
initial
velocity
of
ball
)
<
(
initial
velocity
of
intermediate
layer
-
encased
sphere
)
0.65
≤
(
initial
velocity
of
intermediate
layer
-
encased
sphere
)
-
(
initial
velocity
of
entire
core
)
≤
0.98
(
m
/
s
)
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