Patent ID: 7915373

Claim:
A golf ball comprising a cover, the cover comprising, as a base resin, a polyurethane ionomer containing a polycarbonate polyol and a component containing an acidic group as a constitutional components, wherein the polycarbonate polyol has a repeating unit (A) as a repeating constitutional unit and a repeating unit (B) having a different structure from that of the repeating unit (A), and a molar ratio of (A)/(B) is 30/70 to 70/30, the repeating unit (A) represented by a following formula (I) and the repeating unit (B) represented by a following formula (II): wherein R 1 is a bivalent residue obtained by removing two hydroxyl groups from a diol having 4 to 6 carbon atoms; and wherein R 2 is a bivalent residue obtained by removing two hydroxyl groups from a diol having 4 to 6 carbon atoms, and the component containing an acidic group is derived from dimethylol propionic acid, dimethylol butanoic acid, dihydroxypropionic acid, or dihydroxysuccinic acid, and a rate of content of the component containing an acidic group in the polyurethane ionomer is from 0.27 mass % to 4.5 mass %.