The golf ball

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PROBLEM TO BE SOLVED : To provide a golf ball exceling in repellence and having a good carry performance by an improvement in rubber composition forming a solid core and so on. SOLUTION : When, among them, an organic peroxide (a) with the shortest half life at 155°C is atand an organic peroxide (b) with the longest half life is bt, the ratio of half life bt/atis more than 7 and less than 20. The total content of these organic peroxides is 0.1-0.8 part weight for the 100 part weight of above-mentioned rubber substrate and this rubber has a composition element of a vulcanizing molded product. The golf ball includes 10-60 part weight of unsaturated carboxylic acid and/or its metal salt, 0.1-5 parts weight of organic sulfur compound, 5-80 parts weight of inorganic filler and two or more kinds of organic peroxide based on a 100 parts weight of rubber substrate contains more than 60 % by weight of cis-1, 4-connections and 60-100% by weight of polybutadiene, synthesized by using rare earth element catalysts having more than 40 of Mooney viscosity (ML1+4(100°C)). COPYRIGHT : (C)2004, JPO