| 摘要 |
In a multi-piece golf ball comprising a solid core, an intermediate layer, and a cover, the intermediate layer and/or the cover is formed of a heated mixture having a melt index of at least 1.0 dg/min and comprising (a) an olefin-carboxylic acid random copolymer and/or an olefin-carboxylic acid-carboxylate random copolymer and/or (d) a metal ion-neutralized olefin-carboxylic acid random copolymer and/or a metal ion-neutralized olefin-carboxylic acid-carboxylate random copolymer; (b) a fatty acid or derivative having a molecular weight of at least 280; and (c) a neutralizing basic inorganic metal compound. All expressed in Shore D hardness, the intermediate layer has a hardness of 40-63, the cover has a hardness of 45-68, and they satisfy the relationship: the hardness of solid core at its center<=the hardness of intermediate layer<=the hardness of cover. The ball is improved in feel, control and flight performance.
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