US2025186841A1PendingUtilityA1
Golf ball
Est. expiryDec 8, 2043(~17.4 yrs left)· nominal 20-yr term from priority
A63B 37/0074A63B 37/0075A63B 37/0031A63B 37/0034A63B 37/0066A63B 37/0047A63B 37/0035
54
PatentIndex Score
0
Cited by
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0
Claims
Abstract
A golf ball includes at least one intermediate layer formed between a core and a cover, wherein a standard deviation of a specific gravity of each layer of the core, the intermediate layer, the cover is within 0.07, and the cover is formed of a resin composition that includes the following components (I) and (II):(I) polyurethane(II) (meth)acrylic block copolymer,and the cover satisfies the following condition (1):0.1≤VRL×VRH≤0.26(1)[in the above condition, VRL represents a viscosity at 210° C. and a viscosity at 200° C. at a predetermined shear rate, and VRH represents a ratio between a viscosity η3 at 230° C. and a viscosity at 220° C. at the predetermined shear rate].
Claims
exact text as granted — not AI-modified1 . A golf ball comprising at least one intermediate layer formed between a core and a cover, wherein a standard deviation of a specific gravity of each layer of the core, the intermediate layer, and the cover is within 0.07, the cover is formed of a resin composition that includes the following components (I) and (II):
(I) polyurethane (II) (meth)acrylic block copolymer,
and the cover satisfies the following condition (1):
0.1
≤
VR
L
×
V
R
H
≤
0
.
2
6
(
1
)
[in the above condition, VR L represents a ratio (η1/η0) of a viscosity η1 (dPa·s) at 210° C. and a viscosity η0 (dPa·s) at 200° C. at a shear rate of 1,216 (1/sec), and VR H represents a ratio (η3/η2) of a viscosity η3 (dPa·s) at 230° C. and a viscosity η2 (dPa·s) at 220° C. at the shear rate of 1,216 (1/sec)].
2 . The golf ball according to claim 1 , wherein a compounding amount of the component (II) is not more than 20 parts by weight per 100 parts by weight of the component (I).
3 . The golf ball according to claim 1 , wherein a material hardness of the component (II) is not more than 40 on the Shore D hardness scale.
4 . The golf ball according to claim 1 , wherein the component (II) has a rebound elasticity of not more than 40% as measured by the JIS-K 6255 standard.
5 . The golf ball according to claim 1 , wherein a melt flow rate (MFR) value of the component (II) is at least 20 g/10 min under measurement conditions of 230° C. and a load of 2.16 kgf (ISO 1133).
6 . The golf ball according to claim 1 , wherein in a block copolymer of the component (II), a hard segment is mainly composed of a methyl methacrylate unit, and a soft segment is mainly composed of an n-butyl acrylate unit or an n-butyl acrylate/2-ethylhexyl acrylate unit.
7 . The golf ball according to claim 6 , wherein a content of the methyl methacrylate unit in the block copolymer of the component (II) is from 20 to 50 wt %.
8 . The golf ball according to claim 1 , wherein when the specific gravity of the core is denoted by CM, the specific gravity of the intermediate layer is denoted by MM, the specific gravity of the cover is denoted by FM, an initial velocity (m/s) of the core is denoted by CV, an initial velocity (m/s) of a sphere (intermediate layer-encased sphere) obtained by encasing the core with the intermediate layer is denoted by MV, an initial velocity (m/s) of a sphere (ball) obtained by coating the intermediate layer-encased sphere with the cover is denoted by FV, and a deflection (mm) when a ball is compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf) is denoted by FC, the following condition (2) is satisfied:
(
C
M
×
C
V
)
+
(
M
M
×
M
V
)
+
(
F
M
×
FV
/
FC
)
>
200
(
2
)
[where the initial velocities of the core and the intermediate layer-encased sphere are measurement values obtained by measuring each target sphere using an initial velocity measuring instrument of the same method as the drum rotation type initial velocity meter of the USGA, and the initial velocity of the ball is a measurement value obtained by measuring the target sphere using a COR type initial velocity meter of the same type as the R&A].
9 . The golf ball according to claim 1 , wherein a moment of inertia of the ball is from 82.5 to 85.0 g·cm 2 .
10 . The golf ball according to claim 1 , wherein when the specific gravity of the core is denoted by CM, the specific gravity of the intermediate layer is denoted by MM, the specific gravity of the cover is denoted by FM, an initial velocity (m/s) of the core is denoted by CV, an initial velocity (m/s) of the sphere (intermediate layer-encased sphere) obtained by encasing the core with the intermediate layer is denoted by MV, an initial velocity (m/s) of the sphere (ball) obtained by encasing the intermediate layer-encased sphere with the cover is denoted by FV, and a moment of inertia of the ball is denoted by MOI, the following condition (3) is satisfied:
(
C
M
×
CV
/
MOI
)
+
(
M
M
×
M
V
)
+
(
F
M
×
FV
/
FC
)
>
110.
(
3
)
11 . The golf ball according to claim 1 , wherein all the layers of the core, the intermediate layer, and the cover have a specific gravity of from 1.10 to 1.13 g/cm 3 .
12 . The golf ball according to claim 1 , wherein a relationship between the specific gravities of the intermediate layer and the cover satisfies the following condition:
−0.03≤(specific gravity of intermediate layer−specific gravity of cover)≤0.03.
13 . The golf ball according to claim 1 , wherein a material of the intermediate layer contains barium sulfate as a specific gravity adjusting material.
14 . The golf ball according to claim 1 , wherein a material hardness of the cover is from 40 to 52 on the Shore D hardness scale.
15 . The golf ball according to claim 1 , wherein 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) is not more than 2.8 mm.Join the waitlist — get patent alerts
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