| abstract |
The invention provides a golf ball material made of a resin composition composed of (a) an olefin-unsaturated carboxylic acid copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from about 120,000 to about 200,000 and a weight-average molecular weight (Mw) to number-average molecular weight (Mn) ratio of from about 3.0 to about 10.0, or a metal neutralization product thereof, (b) an organic acid or a metal salt thereof, and (c) a basic inorganic metal which is capable of neutralizing acid groups in components (a) and (b). The golf ball material of the invention enables a highly neutralized ionomer having good flow properties and moldability to be achieved. Golf balls in which an injection molding of the golf ball material is used as the cover material have an excellent rebound and durability. |