Patent ID: 6126560
Filing Date: 2000-10-03
Classification: A63B,B29C,B29D,B29K,B29L

Abstract:
A method of making a hollow golf ball comprising a hollow core composed of a hollow center having a hollow portion and optionally one or more intermediate core layers formed on the hollow center, and a cover formed on the hollow core, comprising the steps of(a) preparing a rubber composition for the hollow center,(b) molding the rubber composition for the hollow center into a vulcanized semi-spherical half-shell, and(c) bonding two said vulcanized semi-spherical half-shells by placing an unvulcanized adhesive rubber composition between bonding surfaces of the two vulcanized semi-spherical half-shells, and vulcanizing it in a mold to form the hollow center, wherein the unvulcanized rubber composition has a t.sub.90 time of 5 to 20 minutes, the t.sub.90 time being a time for reaching 90% of a maximum torque, when the unvulcanized rubber composition is formed into a circular sample having a diameter of 43 mm and a thickness of 3 mm and torque is measured using a curastometer at a test temperature that is the same as a vulcanizing temperature.