SOLID GOLF BALL

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PROBLEM TO BE SOLVED : To provide a solid golf ball having a soft feel upon impact and excellent rebound characteristics. SOLUTION : This solid golf ball comprises (a) 100 parts by weight of a polybutadiene synthesized using a rare-earth catalyst and having a cis-1, 4 content of at least 60% and a 1, 2 vinyl content of at most 2%, having a viscosity η at 25°C as a solution in toluene of up to 600 mPas, and having Mooney viscosity of more than 30, (b) a prescribed parts by weight of sulfur, (c) an unsaturated carboxylic acid and/or a metal salt thereof, (d) an organosulfur compound, (e) 5 to 80 parts by weight of an inorganic filler, and (f) an organic peroxide, wherein the hot-molded product has a difference in JIS-C hardness between the center and surface thereof of more than 20 and up to 40. The solid golf balls have a soft feel upon impact and excellent rebound characteristics. Moreover, the solid golf ball is improved in flight performance by making its spin rate reduced when shot with a driver. COPYRIGHT : (C)2006, JPO&NCIPI