| 摘要 |
Disclosed is a golf ball including, as a composing element, a hot-molded product obtained from a rubber composition. The rubber composition includes: a polybutadiene obtained by mixing a polybutadiene (a) with a polybutadiene (b) at a mass ratio Ä(a)/(b)Ü ranging from 70/30 to 10/90, an unsaturated carboxylic acid and/or a metal salt thereof, and an organic peroxide. The polybutadiene (a) contains 60% or more of cis-1,4-bonds and has a Mooney viscosity ÄML1+4(100 DEG C)Ü of 10 or more and less than 50, and is synthesized by using a group VIII element catalyst, and the polybutadiene (b) contains 60% or more of cis-1,4-bonds and has a Mooney viscosity ÄML1+4(100 DEG C)Ü of 50 or more, and is synthesized by using a rare earth element based catalyst. |
