Patent ID: 7230053

Claim:
A golf ball comprising as a constituent component a molded and vulcanized product of a rubber composition comprising (A) 100 parts by weight of a base rubber, (B) 10 to 60 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof, (C) 1 to 80 parts by weight of an inorganic filler, (D) 0.05 to 3 parts by weight of an organic peroxide, and (E) 0.1 to 5 parts by weight of an organosulfur compound, wherein said component (A) comprises (A-1) a polybutadiene having a weight average molecular weight (Mw) of 60×10 4 to 150×10 4 and a dispersity (Mw/Mn) of up to 2.0, and containing at least 98% of cis-1,4 bonds and up to 1.5% of trans-1,4 bonds in the molecule, and (A-2) 5 to 50% by weight of a polybutadiene which has been synthesized using a neodymium catalyst, said component (D) comprises an organic peroxide (D-1) having the shortest half-life at 155° C. and another organic peroxide (D-2) having the longest half-life at 155° C., the half-life of (D-1) is t(D-1), the half-life of (D-2) is t(D-2), and the ratio of half-lives t(D-2)/t(D-1) is at least 7 and up to 20, and said molded and vulcanized product has a resilience of at least 74%.