US2024399213A1PendingUtilityA1
Multi-piece solid golf ball
Est. expiryMay 31, 2043(~16.8 yrs left)· nominal 20-yr term from priority
A63B 37/0065A63B 37/0068A63B 37/0076A63B 37/0033A63B 37/0066A63B 37/0045A63B 37/0064A63B 37/0043A63B 37/008A63B 37/0082A63B 37/0062A63B 37/0084A63B 37/0047A63B 37/0075
60
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0
Cited by
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Claims
Abstract
A multi-piece solid golf ball includes a core, an intermediate layer, and a cover, in which the core is formed of a rubber composition, the intermediate layer and the cover are formed of a single-layer resin composition, and a relationship among an initial velocity of the core, an initial velocity of an intermediate layer-encased sphere, and an initial velocity of a sphere (ball) obtained by encasing the intermediate layer-encased sphere with the cover satisfies (ball initial velocity)<(initial velocity of intermediate layer-encased sphere) and 0.60≤(initial velocity of intermediate layer-encased sphere)−(core initial velocity)≤0.90 (m/s). When each sphere of the core and the ball is compressed under a specific load and deflections are denoted by C (mm) and B (mm), respectively, a value of C−B is not more than 1.10 mm, and 0.024≤(intermediate layer thickness)/(ball diameter)≤0.034 is satisfied.
Claims
exact text as granted — not AI-modified1 . A multi-piece solid golf ball comprising a core, an intermediate layer, and a cover, wherein the core is formed of a rubber composition into a single layer or a plurality of layers, the intermediate layer and the cover are both formed of a single-layer resin composition, and a relationship among an initial velocity of the core, an initial velocity of a sphere (intermediate layer-encased sphere) obtained by encasing the core with the intermediate layer, and an initial velocity of a sphere (ball) obtained by encasing the intermediate layer-encased sphere with the cover satisfies the following two conditions:
(
initial
velocity
of
ball
)
<
(
initial
velocity
of
intermediate
layer
-
encased
sphere
)
0.6
≤
(
initial
velocity
of
intermediate
layer
-
encased
sphere
)
-
(
initial
velocity
of
core
)
≤
0.9
(
m
/
s
)
,
wherein when each sphere of the core and the ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) and deflections (mm) are denoted by C (mm) and B (mm), respectively, a value of C−B is not more than 1.10 mm, and a relationship between a thickness of the intermediate layer and a diameter of the ball satisfies the following condition:
0.024≤(thickness of intermediate layer)/(diameter of ball)≤0.034.
2 . The multi-piece solid golf ball of claim 1 , wherein a specific gravity of the intermediate layer is at least 1.05.
3 . The multi-piece solid golf ball of claim 1 , wherein the resin composition of the intermediate layer contains a high-acid ionomer resin having an acid content of at least 16 wt %.
4 . The multi-piece solid golf ball of claim 1 , wherein the intermediate layer contains an inorganic particulate filler.
5 . The multi-piece solid golf ball of claim 1 , wherein a difference between a specific gravity of the cover and a specific gravity of the intermediate layer, a difference between the specific gravity of the intermediate layer and a specific gravity of the core, and a difference between the specific gravity of the core and the specific gravity of the cover are all within 0.15.
6 . The multi-piece solid golf ball of claim 1 , wherein the deflection B of the ball has a value of not more than 3.0 mm.
7 . The multi-piece solid golf ball of claim 1 , wherein the following condition is satisfied:
ball surface hardness<surface hardness of intermediate layer-encased sphere>core surface hardness, where the surface hardness of each sphere means Shore C hardness.
8 . The multi-piece solid golf ball of claim 1 , wherein the following condition is satisfied:
cover thickness<intermediate layer thickness, where the intermediate layer thickness is from 1.02 to 1.45 mm.
9 . The multi-piece solid golf ball of claim 1 , wherein the core has a diameter of from 36.7 to 40.1 mm, and the core has a hardness profile in which, letting the Shore C hardness at a core center be Cc, the Shore C hardness at a position 4 mm outward from the core center be Cc+4, the Shore C hardness at a midpoint M between the core center and a core surface be Cm, the Shore C hardness at a position 4 mm inward from the midpoint M of the core be Cm−4, the Shore C hardness at a position 4 mm outward from the midpoint M of the core be Cm+4, the Shore C hardness at a position 4 mm inward from the core surface be Cs−4, and the Shore C hardness at the core surface be Cs, and defining surface areas A to D as follows:
surface
area
A
:
1
/
2
×
4
×
(
Cc
+
4
-
Cc
)
surface
area
B
:
1
/
2
×
4
×
(
Cm
-
Cm
-
4
)
surface
area
C
:
1
/
2
×
4
×
(
Cm
+
4
-
Cm
)
surface
area
D
:
1
/
2
×
4
×
(
Cs
-
Cs
-
4
)
(
surface
area
C
+
surface
area
D
)
-
(
surface
area
A
+
surface
area
B
)
≥
2.
is
satisfied
.
10 . The multi-piece solid golf ball of claim 9 , wherein the following two conditions are satisfied:
(
surface
area
C
)
-
(
surface
area
A
+
surface
area
B
)
≥
2.
(
surface
area
D
)
-
(
surface
area
A
+
surface
area
B
)
≥
2.
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