Patent ID: 8008392

Claim:
A golf ball material which is a resin mixture comprising: (a) a nonionic olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 40,000 to 200,000, a weight-average molecular weight (Mw)/number-average molecular weight (Mn) ratio of from 2.5 to 10.0 and an unsaturated carboxylic acid content of at least 16 wt %, (b) a nonionic olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having a weight-average molecular weight (Mw) of from 40,000 to 200,000, a weight-average molecular weight (Mw)/number-average molecular weight (Mn) ratio of from 4.0 to 10.0 and an unsaturated carboxylic acid content of not more than 15 wt %, (c) an organic acid or a metal salt thereof, and (d) a basic inorganic metal compound for neutralizing at least 70 mol % of acid groups in components (a) to (c); wherein the resin mixture has a Shore D hardness of from 40 to 60.