Golf ball resin composition and golf ball

1. A golf ball resin composition characterized in that a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfy a following expression;

log ( E′/E″ 2 )≧−6.08

when measured at the conditions of a temperature of 12° C., an oscillation frequency of 10 Hz, and a strain of 0.05% in a tensile mode using a dynamic viscoelasticity measuring apparatus, and

the golf ball resin composition comprises:

(A) at least one resin component selected from the group consisting of (a-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-2) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and (a-4) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and

(B) a metal salt of a fatty acid in an amount ranging from 25 parts to 100 parts by mass, with respect to 100 parts by mass of (A) the resin component.

2. The golf ball resin composition according to claim 1 , wherein the metal salt of the fatty acid is a metal salt of a fatty acid having 18 to 30 carbon atoms.

3. The golf ball resin composition according to claim 1 , wherein the fatty acid component of the metal salt of the fatty acid includes stearic acid, behenic acid, or montanic acid.

4. The golf ball resin composition according to claim 1 , wherein the metal component of the metal salt of the fatty acid includes magnesium, calcium, or barium.

5. The golf ball resin composition according to claim 1 , wherein the (A) resin component comprises (a-3) the ternary copolymer composed of the olefin, the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and the α,β-unsaturated carboxylic acid ester, or (a-4) the ionomer resin consisting of the metal ion-neutralized product of the ternary copolymer composed of the olefin, the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and the α,β-unsaturated carboxylic acid ester.

6. The golf ball resin composition according to claim 1 , wherein the golf ball resin composition has a hardness ranging from 20 to 65 in Shore D hardness.

7. The golf ball resin composition according to claim 1 , wherein the golf ball resin composition has rebound resilience of 46% or more.

8. A golf ball comprising a core composed of at least one layer and a cover covering the core, wherein at least one layer of the core is formed from a golf ball resin composition characterized in that a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfy a following expression;

log ( E′/E″ 2 )≧−6.08

when measured at the conditions of a temperature of 12° C., an oscillation frequency of 10 Hz, and a strain of 0.05% in a tensile mode using a dynamic viscoelasticity measuring apparatus, and

the golf ball resin composition comprises:

(A) at least one resin component selected from the group consisting of (a-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-2) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and (a-4) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and

(B) a metal salt of a fatty acid in an amount ranging from 25 parts to 100 parts by mass, with respect to 100 parts by mass of (A) the resin component.

9. The golf ball according to claim 8 , wherein the metal salt of the fatty acid is a metal salt of a fatty acid having 18 to 30 carbon atoms.

10. The golf ball according to claim 8 , wherein the fatty acid component of the metal salt of the fatty acid includes stearic acid, behenic acid, or montanic acid.

11. The golf ball according to claim 8 , wherein the metal component of the metal salt of the fatty acid includes magnesium, calcium, or barium.

12. The golf ball according to claim 8 , wherein the (A) resin component comprises (a-3) the ternary copolymer composed of the olefin, the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and the α,β-unsaturated carboxylic acid ester, or (a-4) the ionomer resin consisting of the metal ion-neutralized product of the ternary copolymer composed of the olefin, the α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and the α,β-unsaturated carboxylic acid ester.

13. A one-piece golf ball comprising a golf ball body formed from a golf ball resin composition characterized in that a storage modulus E′ (Pa) and a loss modulus E″ (Pa) satisfy a following expression;

log ( E′/E″ 2 )≧−6.08

when measured at the conditions of a temperature of 12° C., an oscillation frequency of 10 Hz, and a strain of 0.05% in a tensile mode using a dynamic viscoelasticity measuring apparatus, and

the golf ball resin composition comprises:

(A) at least one resin component selected from the group consisting of (a-1) a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-2) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer composed of an olefin and an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; (a-3) a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and (a-4) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer composed of an olefin, an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms, and an α,β-unsaturated carboxylic acid ester; and

(B) a metal salt of a fatty acid in an amount ranging from 25 parts to 100 parts by mass, with respect to 100 parts by mass of (A) the resin component.

14. The one-piece golf ball according to claim 13 , wherein the metal salt of the fatty acid is a magnesium salt, calcium salt, or barium salt of a fatty acid having 18 to 30 carbon atoms.