Golf ball resin composition and golf ball

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.

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.