Patent ID: 6846247
Filing Date: 2005-01-25
Classification: A63B,B32B

Abstract:
1. A thread wound golf ball comprising (a) a solid center composed of an inner center formed from a vulcanized molded rubber composition containing an oily substance, and a center outer layer formed from an oil-resistant thermoplastic elastomer selected from the group consisting of polyurethane thermoplastic elastomer, polyester thermoplastic elastomer, polyamide thermoplastic elastomer and a mixture thereof that is composed of hard segment and soft segment, and coated around the inner center so as to prevent the oily substance of the inner center from bleeding, (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 24 to 33 mm, a JIS-A hardness of not more than 50 and a deformation amount of not less than 2.0 mm when applying from an initial load of 1 kg to a final load of 5 kg, the center outer layer has a Shore D hardness of not more than 60, and the solid center has a diameter of 25 to 34 mm.