| abstract |
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 composed primarily of a polybutadiene containing at least 60 wt % of cis-1,4-bond, having a Mooney viscosity (ML 1+4 , 100° C.) of at least 30, and synthesized using a rare-earth catalyst, 15-50 pbw of an unsaturated carboxylic acid and/or a metal salt thereof, at least 2 pbw of a processing aid having a highest melting point of up to 115° C., 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 t /a t ) being at least 7 wherein a t is the half-life of (a) and b t is the half-life of (b), a total content of the organic peroxides being 0.1-0.9 pbw per 100 pbw of the base rubber. |