Patent ID: 7074859

Claim:
A golf ball characterized by comprising a molded and vulcanized product of a rubber composition as a constituent component, the rubber composition comprising 100 parts by weight of a base rubber including 60 to 100% by weight of a polybutadiene containing at least 60% by weight of cis-1,4-bond, having a Mooney viscosity (MIL 1+4 (100Â° C.)) of at least 52, and synthesized using a rare-earth catalyst, 10 to 60 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof, 0.1 to 5 parts by weight of an organosulfur compound selected from the group consisting of pentachlorothiophenol, pentafluorothiophenol, pentabromothiophenol, p-chlorothiophenol, and zinc salts thereof, diphenyl polysulfides, dibenzyl polysulfides, dibenzoyl polysulfides, dibenzothiazoyl polysulfides, dithiobenzoyl polysulfides, and alkylphenyl disulfides, 5 to 80 parts by weight of an inorganic filler, and at least two organic peroxides including an organic peroxide having the shortest half-life at 155Â° C. designated (a) and another organic peroxide having the longest half-life at 155Â° C. designated (b), a ratio of half-lives (b t /a t ) being from 7 to 16 wherein a t is the half-life of (a) of at least 15 seconds and up to 120 seconds and b t is the half-life of (b) of at least 300 seconds and up to 600 seconds, a total content of the organic peroxides being 0.1 to 0.8 part by weight per 100 parts by weight of said base rubber.