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A golf ball having an improved low temperature impact resistance, which comprises a core and a cover made of a cover composition containing an ionic copolymer having at least two different metal ions in one molecule. The cover composition is prepared by kneading a sodium ion type ionic copolymer hav

A golf ball having an improved low temperature impact resistance, which comprises a core and a cover made of a cover composition containing an ionic copolymer having at least two different metal ions in one molecule. The cover composition is prepared by kneading a sodium ion type ionic copolymer having free carboxyl groups and a metal oxide such as magnesium or zinc oxide at high temperatures, whereby the metal oxide is reacted with the ionic copolymer to incorporate the metal ion such as magnesium or zinc ion into the ionic copolymer.

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A golf ball consisting essentially of a core and a cover, said cover being made of a cover composition prepared by kneading a composition comprising an ionic copolymer of units of ethylene and units of an unsaturated monocarboxylic acid, a part of the unsaturated monocarboxylic acid units being in t

A golf ball consisting essentially of a core and a cover, said cover being made of a cover composition prepared by kneading a composition comprising an ionic copolymer of units of ethylene and units of an unsaturated monocarboxylic acid, a part of the unsaturated monocarboxylic acid units being in the form of sodium salt, and 0.1 to 3.0 parts by weight of a metal oxide per 100 parts by weight of said ionic copolymer at a temperature of 120°to 250°C. to react the ionic copolymer with the metal oxide, wherein the metal oxide is at least one member selected from the group consisting of magnesium oxide and zinc oxide.