| 摘要 |
A golf ball is characterized by comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising 100 pbw of a base rubber including 60-100 wt % of a polybutadiene containing at least 60 wt % of cis-1,4-bond, having a Mooney viscosity (ML<SUB>1+4 </SUB>(100° C.)) of at least 40, and synthesized using a rare-earth catalyst, 10-60 pbw of an unsaturated carboxylic acid and/or a metal salt thereof, 0.1-5 pbw of an organosulfur compound, 5-80 pbw of an inorganic filler, and at least two organic peroxides including an organic peroxide having the shortest half-life at 155° C. designated (a) and another organic peroxide having the longest half-life at 155° C. designated (b), a ratio of half-lives (b<SUB>t</SUB>/a<SUB>t</SUB>) being from 7 to 20 wherein a<SUB>t </SUB>is the half-life of (a) and b<SUB>t </SUB>is the half-life of (b), a total content of the organic peroxides being 0.1-0.8 pbw per 100 pbw of the base rubber. |
