Patent ID: 9062178
Filing Date: 2015-06-23
Classification: A63B,C08K

Abstract:
1. A two-piece golf ball comprising a single-layered core and a cover covering the core, wherein the single-layered core is formed from a golf ball resin composition having a spin-lattice relaxation time (T 1 ) of 13 C nucleus measured by a high resolution solid state carbon nuclear magnetic resonance (NMR) method of 6.1 seconds or shorter and a melt flow rate (190° C., 2.16 kg) of 7.06 g/10 min to 100 g/10 min, wherein 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, wherein a content of (B) the metal salt of the fatty acid is in a range from 89.8 parts to 100 parts by mass, with respect to 100 parts by mass of (A) the resin component, wherein the metal ion used for neutralization of carboxyl groups of (a-2) the binary ionomer resin include sodium, potassium, lithium, magnesium, calcium, barium, cadmium, aluminum, tin, or zirconium, and wherein the metal ion used for neutralization of carboxyl groups of (a-4) the ternary ionomer resin include sodium, potassium, lithium, magnesium, calcium, barium, cadmium, aluminum, tin, or zirconium.