GOLF BALL

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PROBLEM TO BE SOLVED : To provide a golf ball very excellent in repulsion. SOLUTION : The golf ball features a composition of (a) polybutadiene having 60% or more of cis 1, 4 bond, base material rubber mixed with 10 to 90 mass% of polybutadiene synthesized by a rare earth element system catalyst that satisfies the relationship (20×ML-200≥η≥20×ML -540) where the Mooney viscosity (ML) (ML1+4 (100°C)) is 40 or more and 80 or under and the viscosity of 5 mass% of toluene solution at 25°C is η(mPa s), unsaturated carboxylic acid and/or metal salt, organic peroxide, antiaging agent, and a hot molding of a rubber composition made by mixing 0.2 pt.mass or less of the antiaging agent to 100 pts mass of the base material rubber. The invented golf ball is excellent in repulsion. COPYRIGHT : (C)2008, JPO&INPIT