Patent ID: 6837804

Claim:
A two-piece solid golf ball comprising an outer cover and a solid core coated with the outer cover, wherein the outer cover is formed from a cover-forming material (C) predominantly containing the following components (A) and (B): (A) a thermoplastic polyurethane material including a polyether polyol of polytetramethylene glycol, and (B) an isocyanate mixture in which an isocyanate compound (b-1) having at least two isocyanate groups serving as functional groups in the molecule is dispersed in a thermoplastic resin (b-2) which is substantially non-reactive with the isocyanate groups, wherein the thermoplastic resin is a polyester elastomer composed of an ether-ester block copolymer; the outer cover has a JIS C hardness of 72 to 89, and has a thickness of 0.70 to 1.95 mm; the solid core is formed from a rubber material containing an organic sulfur compound; and a center portion of the core has a JIS C hardness of 58 to 68, a surface portion of the core has a JIS C hardness of 71 to 87, and a value obtained through subtraction of the JIS C hardness of the center portion of the core from the JIS C hardness of the surface portion of the core is 8 to 21.