Golf ball resin composition and golf ball using the same
An object of the present invention is to provide a golf ball resin composition that comprises an ionomer resin with an excellent resilience and fluidity. Another object of the present invention is to provide a golf ball excellent in the resilience without lowering the durability significantly in a golf ball using the ionomer resin for the intermediate layer. The present invention provides a golf ball resin composition comprising, 100 parts by mass of (A) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester, and from 25 parts to 100 parts by mass of (B) a metal salt of a fatty acid having 18 to 30 carbon atoms. The golf ball of the present invention is not limited, as long as it comprises a constituent member formed from the golf ball resin composition of the present invention.
1. A three-piece golf ball comprising
a core having a center and one intermediate layer disposed around the center, and
a cover disposed around the core, wherein the intermediate layer is formed from a golf ball resin composition consisting of
100 parts by mass of (A) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester, and
from 33 parts to 100 parts by mass of (B) a metal salt of a fatty acid having 18 to 30 carbon atoms,
and optionally a pigment component, a specific gravity adjusting agent, a dispersant, an antioxidant, an ultraviolet absorber, a light stabilizer, a fluorescent material, or a fluorescent brightener,
wherein the golf ball resin composition has a melt flow rate (190 ° C., 2.16 kg) in a range from 14.7 g/10 min to 600 g/10 min and a slab hardness in a range from 51 to 70 in a Shore D hardness, and
wherein the core has a center hardness in a range from 35 to 45 in Shore D hardness, a surface hardness in a range from 30 to 68 in Shore D hardness, a diameter of 39.0 mm to 42.2 mm and a compression deformation amount in a range from 2.10 mm to 3.80 mm, when applying a load from 98N as an initial load to 1275N as a final load to the core.
2. The three-piece golf ball according to claim 1 , wherein (A) the ionomer resin is neutralized with magnesium, zinc or sodium.
3. The three-piece golf ball according to claim 1 , wherein a fatty acid component of (B) the metal salt of the fatty acid is stearic acid, behenic acid, or montanic acid.
4. The three-piece golf ball according to claim 1 , wherein a metal component of (B) the metal salt of the fatty acid is magnesium, calcium, or barium.
5. The three-piece golf ball according to claim 1 , wherein the golf ball resin composition has a bending stiffness in a range from 100 MPa to 450 MPa and a rebound resilience in a range from 40% to 80%.
6. The three-piece golf ball according to claim 1 , wherein an area A under a peak around 1600 cm −1 and an area B under a peak around 1700 cm −1 in a spectrum obtained by analyzing the golf ball resin composition by FT-IR satisfy the equation:
0.50≦ P=A/ ( A+B )≦1.00
wherein P is the ratio of neutralized carboxyl groups to all carboxyl groups.
7. The three-piece golf ball according to claim 1 , wherein an area A0 under a peak around 1600 cm −1 corresponding to neutralized carboxyl groups and an area B0 under a peak around 1700 cm −1 corresponding to non-neutralized carboxy groups in a spectrum obtained by analyzing (A) the ionomer resin by FT-IR satisfy the equation:
0.30≦ P 0= A 0/( A 0+ B 0)≦0.98
wherein P0 is the ratio of neutralized carboxyl groups to all carboxyl groups.
8. The three-piece golf ball according to claim 1 , wherein the intermediate layer has a thickness of 0.5 mm or more, and less than 2.5 mm.
9. The three-piece golf ball according to claim 1 , wherein the cover comprises an ionomer resin as a resin component.
10. A three-piece golf ball comprising
a core having a center and one intermediate layer disposed around the center, and
a cover disposed around the core, wherein the intermediate layer is formed from a golf ball resin composition consisting of a resin component and optionally a pigment component, a specific gravity adjusting agent, a dispersant, an antioxidant, an ultraviolet absorber, a light stabilizer, a fluorescent material, or a fluorescent brightener,
wherein the resin component consists of
100 parts by mass of (A) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of ethylene, α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms and α,β-unsaturated carboxylic acid ester,
from 33 parts to 100 parts by mass of (B) a metal salt of a fatty acid having 18 to 30carbon atoms, and
another thermoplastic elastomer such that a total content of (A) the ionomer resin and (B) the metal salt of a fatty acid in the resin component is 50 mass % or more,
wherein the golf ball resin composition has a melt flow rate (190 ° C., 2.16 kg) in a range from 14.7 g/10 min to 600 g/10 min and a slab hardness in a range from 51 to 70 in a Shore D hardness,
wherein the core has a center hardness in a range from 35 to 45 in Shore D hardness, a surface hardness in a range from 30 to 68 in Shore D hardness, a diameter of 39.0 mm to 42.2 mm and a compression deformation amount in a range from 2.10 mm to 3.80 mm, when applying a load from 98 N as an initial load to 1275 N as a final load to the core, and
wherein the cover comprises an ionomer resin as a resin component.
11. The three-piece golf ball according to claim 10 , wherein (A) the ionomer resin is neutralized with magnesium, zinc or sodium.
12. The three-piece golf ball according to claim 10 , wherein a fatty acid component of (B) the metal salt of the fatty acid is stearic acid, behenic acid, or montanic acid.
13. The three-piece golf ball according to claim 10 , wherein a metal component of (B) the metal salt of the fatty acid is magnesium, calcium, or barium.
14. The three-piece golf ball according to claim 10 , wherein the golf ball resin composition has a bending stiffness in a range from 100 MPa to 450 MPa and a rebound resilience in a range from 40% to 80%.
15. The three-piece golf ball according to claim 10 , wherein an area A under a peak around 1600 cm −1 and an area B under a peak around 1700 cm −1 in a spectrum obtained by analyzing the golf ball resin composition by FT-IR satisfy the equation:
0.50< P=A/ ( A+B )≦1.00
wherein P is the ratio of neutralized carboxyl groups to all carboxyl groups.
16. The three-piece golf ball according to claim 10 , wherein an area A0 under a peak around 1600 cm −1 corresponding to neutralized carboxyl groups and an area B0 under a peak around 1700 cm −1 corresponding to non-neutralized carboxy groups in a spectrum obtained by analyzing (A) the ionomer resin by FT-IR satisfy the equation:
0.30≦ P 0= A 0/( A 0+ B 0)≦0.98
wherein P0 is the ratio of neutralized carboxyl groups to all carboxyl groups.
17. The three-piece golf ball according to claim 10 , wherein the intermediate layer has a thickness of 0.5 mm or more, and less than 2.5 mm.