Patent ID: 7220193

Claim:
A golf ball comprising a core and a cover of one or more layers, characterized in that said golf ball has an outer diameter of 43.0 to 45.0 mm and an initial velocity of at least 77.5 m/s measured by the USGA rotary drum initial velocity instrument approved by R&A, wherein said core has a surface hardness range of 45 to 61 in Shore D hardness and has a center hardness range of 30 to 50 in Shore D hardness and the value of core surface hardness minus core center hardness is in a range of 5 to 20, wherein at least one layer of said cover is a mixture comprising as essential components, 100 parts by weight of a resin component comprising, in admixture, a base resin comprising, in admixture, (a) an olefin-unsaturated carboxylic acid binary random copolymer and/or a metal ion-neutralized product of an olefin-unsaturated carboxylic acid binary random copolymer and (b) an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer and/or a metal ion-neutralized product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer, in a weight ratio between 100:0 and 25:75, and (e) a non-ionomeric thermoplastic elastomer in a weight ratio between 100:0 and 50:50, (c) 5 to 80 parts by weight of a fatty acid having a molecular weight of 280 to 1,500 or derivative thereof, and (d) 0.1 to 10 parts by weight of a basic inorganic metal compound.