Patent ID: 7067572

Claim:
A golf ball, 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 composed primarily of a polybutadiene containing at least 60% by weight 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 to 50 parts by weight of an unsaturated carboxylic acid and/or a metal salt thereof; at least 2 parts by weight of a processing aid having a melting point of 60 to 115° C.; 1.2 to 5 parts by weight of an organic peroxide; and 0.2 to 5 parts by weight of an organosulfur compound, wherein the processing aid comprises a mixture of a metal salt of higher fatty acid primarily containing a metal salt of saturated fatty acid and at least one compound selected from the group consisting of (i) higher fatty acid metal salts, (ii) metal complexes, (iii) aliphatic hydrocarbons, (iv) fatty acid esters, and (v) aliphatic alcohols.