Patent ID: 6227987
Filing Date: 2001-05-08
Classification: A63B

Abstract:
A thread wound golf ball, comprising:(a) a solid center composed of an inner center and a center outer layer formed on the inner center,(b) a thread rubber layer formed on the solid center, and(c) a cover covering the thread rubber layer, wherein the inner center has a diameter of 29 to 35 mm and a center hardness in JIS-C hardness of 30 to 70, the center outer layer has a JIS-C hardness of 70 to 90, the hardness difference between the center outer layer and the center point of the inner center being from 5 to 60, the solid center has a diameter of 30 to 38 mm and is formed from a rubber composition comprising polybutadiene rubber containing not less than 40% of a cis- 1,4 bond, a metal salt of a .alpha.,.beta.-unsaturated carboxylic acid and an organic peroxide, and the cover is formed from thermoplastic resin having a Shore D hardness of 40 to 60.