Patent ID: 6626770
Filing Date: 2003-09-30
Classification: A63B

Abstract:
A multi-piece solid golf ball comprising a core consisting of an inner core, a middle core covering the inner core and an outer core covering the middle core, and at least one layer of cover formed on the core, whereinthe inner core has a JIS-C hardness of 63 to 83, the outer core has a JIS-C hardness of 63 to 83, the JIS-C hardness of the inner core is larger than the JIS-C hardness of the middle core by 4 to 40, and the JIS-C hardness of the outer core is larger than the JIS-C hardness of the middle core by 4 to 40 greater; the inner core and outer core are formed from a vulcanized molded article of a rubber composition comprising base rubber, co-crosslinking agent, organic peroxide, and optionally organic sulfide compound; the middle core is formed from a vulcanized molded article of a rubber composition comprising base rubber, co-crosslinking agent, organic peroxide, and organic sulfide compound; and the following two formulas are satisfied when the amount of organic sulfide compound that is added to the inner core, middle core and outer core, based on 100 parts by weight of the base rubber is H1, H2, and H3, respectively, in terms of parts by weight: 0&lE;H1/H2<1 â€ƒ0&lE;H3/H2<1.