US2013324311A1PendingUtilityA1
Rubber composition and golf ball
Est. expiryJun 1, 2032(~5.8 yrs left)· nominal 20-yr term from priority
A63B 37/0051C08K 5/09A63B 37/006A63B 37/0054
48
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Claims
Abstract
The invention provides a rubber composition having high rebound resilience measured by a rebound resilience evaluation method which is excellent in measurement accuracy and can sufficiently evaluate the difference in performance between samples. The invention also provides a golf ball formed from the rubber composition. The invention further provides a golf ball having excellent flight performance owing to good hardness distribution measured by a hardness evaluation method which is excellent in measurement accuracy and can sufficiently evaluate the difference in performance between samples. The invention relates to a rubber composition having a specific radius of gyration R g obtained by a predetermined curve fitting method. The invention also relates to a golf ball including a spherical core having at least one layer, and a cover having at least one layer disposed to cover the spherical core, wherein the golf ball satisfies a predetermined relation obtained by a predetermined curve fitting method.
Claims
exact text as granted — not AI-modified1 . A rubber composition which has a radius of gyration R g of 5.0 nm or less,
the radius of gyration R g being obtained by curve fitting of a scattering intensity curve I (q) obtained by X-ray scattering measurement or neutron scattering measurement, using the following Formulas 1 to 3:
q
=
4
πsin
(
θ
/
2
)
λ
(
θ
:
Scattering
angle
,
λ
:
Wavelength
of
X
rays
or
neutron
beam
)
(
Formula
1
)
I
(
q
)
=
∑
i
=
1
n
〈
P
i
[
{
erf
(
qR
gi
6
)
3
/
q
}
]
D
fi
exp
(
-
q
2
R
g
(
i
+
l
)
2
3
)
+
G
i
exp
(
-
q
2
R
g
(
i
+
l
)
2
3
)
〉
+
P
n
+
1
[
{
erf
(
qR
g
(
n
+
1
)
6
)
3
/
q
}
]
D
f
(
n
+
1
)
(
Formula
2
)
erf
(
z
)
=
2
π
∫
0
z
-
t
2
t
(
P
i
,
G
i
,
R
gi
,
D
fi
:
Fitting
parameter
)
(
n
:
Integer
)
(
q
:
Defined
in
the
same
manner
as
mentioned
above
)
(
z
,
t
:
Any
positive
number
)
.
(
Formula
3
)
2 . The rubber composition according to claim 1 ,
wherein the X-ray scattering measurement is small-angle X-ray scattering measurement and the neutron scattering measurement is small-angle neutron scattering measurement.
3 . The rubber composition according to claim 1 ,
wherein the measurement is performed as a function of q defined by Formula 1 in the range of not greater than 10 nm −1 .
4 . A golf ball, comprising:
a spherical core having at least one layer; and a cover having at least one layer disposed to cover the spherical core, wherein at least one layer of the spherical core is formed from the rubber composition according to claim 1 .
5 . The golf ball according to claim 4 ,
wherein at least one layer of the spherical core is formed from the rubber composition which contains: (a) a base rubber; (b) a co-crosslinker including at least one of a C3-C8 α,β-unsaturated carboxylic acid and a metal salt thereof; (c) a cross-linking initiator; and (d) at least one of an acid and a salt thereof, and when the co-crosslinker (b) only includes the C3-C8 α,β-unsaturated carboxylic acid, further contains (e) a metal compound.
6 . The golf ball according to claim 5 ,
wherein the rubber composition contains 0.5 to 30 parts by mass of the at least one of an acid and a salt thereof (d) per 100 parts by mass of the base rubber (a).
7 . The golf ball according to claim 5 ,
wherein the at least one of an acid and a salt thereof (d) each has 1 to 13 carbon atoms.
8 . The golf ball according to claim 5 ,
wherein the at least one of an acid and a salt thereof (d) is at least one of a carboxylic acid and a salt thereof.
9 . The golf ball according to claim 8 ,
wherein the at least one of a carboxylic acid and a salt thereof is at least one of a fatty acid and a fatty acid salt.
10 . The golf ball according to claim 9 ,
wherein the at least one of a fatty acid and a fatty acid salt is a fatty acid zinc salt.
11 . The golf ball according to claim 5 ,
wherein the rubber composition further contains (f) an organosulfur compound.
12 . The golf ball according to claim 11 ,
wherein the organosulfur compound (f) is selected from thiophenols, diphenyl disulfides, thionaphthols, thiuram disulfides, and metal salts thereof.
13 . The golf ball according to claim 11 ,
wherein the rubber composition contains 0.05 to 5 parts by mass of the organosulfur compound (f) per 100 parts by mass of the base rubber (a).
14 . The golf ball according to claim 5 ,
wherein the rubber composition contains 15 to 50 parts by mass of the at least one of a C3-C8 α,β-unsaturated carboxylic acid and a metal salt thereof (b) per 100 parts by mass of the base rubber (a).
15 . The golf ball according to claim 5 ,
wherein the rubber composition contains the metal salt of a C3-C8 α,β-unsaturated carboxylic acid as the co-crosslinker (b).
16 . A golf ball, comprising:
a spherical core having at least one layer; and a cover having at least one layer disposed to cover the spherical core, wherein at least one layer of the spherical core is formed from a rubber composition, and the golf ball satisfies the following relation:
(the number N in an outermost portion of the rubber composition)/(the number N in an innermost portion of the rubber composition)≧2.0,
where the number N is the number per unit volume of scatterers with a radius of gyration R g of 1 nm to 100 μm, and the radius of gyration R g is obtained by curve fitting of a scattering intensity curve I (q) obtained by X-ray scattering measurement or neutron scattering measurement, using the following Formulas 1 to 5:
q
=
4
πsin
(
θ
/
2
)
λ
(
θ
:
Scattering
angle
,
λ
:
Wavelength
of
X
rays
or
neutron
beam
)
(
Formula
1
)
I
(
q
)
=
∑
i
=
1
n
〈
P
i
[
{
erf
(
qR
gi
6
)
3
/
q
}
]
D
fi
exp
(
-
q
2
R
g
(
i
+
1
)
2
3
)
+
G
i
exp
(
-
q
2
R
g
(
i
+
1
)
2
3
)
〉
+
P
n
+
1
[
{
erf
(
qR
g
(
n
+
1
)
6
)
3
/
q
}
]
D
f
(
n
+
1
)
(
Formula
2
)
erf
(
z
)
=
2
π
∫
0
z
-
t
2
t
(
Formula
3
)
G
i
=
N
i
(
σ
V
i
)
2
(
Formula
4
)
V
i
=
4
3
π
(
5
3
R
gi
)
3
(
P
i
,
G
i
,
R
gi
,
D
fi
:
Fitting
parameter
)
(
N
i
:
Number
of
scatterers
per
unit
volume
(
pieces
/
cm
3
)
)
(
V
i
:
Volume
of
scatterer
having
radius
of
gyration
R
gi
)
(
n
:
Integer
)
(
q
:
Defined
in
the
same
manner
as
mentioned
above
)
(
z
,
t
:
Any
positive
number
)
(
σ
:
Electron
density
difference
(
electron
·
cm
-
3
)
between
scatterer
and
surrounding
matrix
material
or
scattering
length
density
difference
(
cm
-
2
)
between
scatterer
and
surrounding
deuterated
solvent
)
.
(
Formula
5
)
17 . The golf ball according to claim 16 ,
wherein the X-ray scattering measurement is small-angle X-ray scattering measurement and the neutron scattering measurement is small-angle neutron scattering measurement.
18 . The golf ball according to claim 16 ,
wherein the measurement is performed as a function of q defined by Formula 1 in the range of not greater than 10 nm −1 .
19 . The golf ball according to claim 16 ,
wherein the rubber composition contains: (a) a base rubber; (b) a co-crosslinker including at least one of a C3-C8 α,β-unsaturated carboxylic acid and a metal salt thereof; (c) a cross-linking initiator; and (d) at least one of an acid and a salt thereof, and when the co-crosslinker (b) only includes the C3-C8 α,β-unsaturated carboxylic acid, further contains (e) a metal compound.
20 . The golf ball according to claim 19 ,
wherein the rubber composition contains 0.5 to 30 parts by mass of the at least one of an acid and a salt thereof (d) per 100 parts by mass of the base rubber (a).
21 . The golf ball according to claim 19 ,
wherein the at least one of an acid and a salt thereof (d) each has 1 to 13 carbon atoms.
22 . The golf ball according to claim 19 ,
wherein the at least one of an acid and a salt thereof (d) is at least one of a carboxylic acid and a salt thereof.
23 . The golf ball according to claim 22 ,
wherein the at least one of a carboxylic acid and a salt thereof is at least one of a fatty acid and a fatty acid salt.
24 . The golf ball according to claim 23 ,
wherein the at least one of a fatty acid and a fatty acid salt is a fatty acid zinc salt.
25 . The golf ball according to claim 19 ,
wherein the rubber composition further contains (f) an organosulfur compound.
26 . The golf ball according to claim 25 ,
wherein the organosulfur compound (f) is selected from thiophenols, diphenyl disulfides, thionaphthols, thiuram disulfides, and metal salts thereof.
27 . The golf ball according to claim 25 ,
wherein the rubber composition contains 0.05 to 5 parts by mass of the organosulfur compound (f) per 100 parts by mass of the base rubber (a).
28 . The golf ball according to claim 19 ,
wherein the rubber composition contains 15 to 50 parts by mass of the at least one of a C3-C8 α,β-unsaturated carboxylic acid and a metal salt thereof (b) per 100 parts by mass of the base rubber (a).
29 . The golf ball according to claim 19 ,
wherein the rubber composition contains the metal salt of a C3-C8 α,β-unsaturated carboxylic acid as the co-crosslinker (b).Join the waitlist — get patent alerts
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