| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a golf ball which has an excellent resistance to discoloration, exhibits a good distance performance on shots with middle irons, and has an excellent feel on impact. <P>SOLUTION: The golf ball has a core formed by vulcanizing a rubber composition and a cover composed primarily of a polyurethane material. The rubber composition of the core includes 100 pts.mass of a base rubber, 10 to 40 pts.mass of an unsaturated carboxylic acid or a metal salt thereof, a peroxyketal (a), and a monophenol-type antioxidant (b), wherein the weight ratio (a)/(b) of the peroxyketal to the monophenol-based antioxidant is 5 to 50. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
