Games using tangible projectile – Golf – Method
Patent
1999-07-16
2000-10-03
Chapman, Jeanette
Games using tangible projectile
Golf
Method
473375, A63B 5700
Patent
active
061265608
ABSTRACT:
A method of producing a hollow golf ball having excellent durability, which comprises a hollow portion with perfect spherical shape. The method of making a hollow golf ball having 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, includes 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 the two 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 then a torque is measured using a curastometer at a test temperature that is the same as a vulcanizing temperature.
REFERENCES:
patent: 700658 (1902-05-01), Kempshall
patent: 704748 (1902-07-01), Kempshall
patent: 716245 (1902-12-01), Kempshall
patent: 736232 (1903-08-01), Davis
patent: 5980395 (1999-11-01), Tsunoda et al.
Hochi Kazuo
Maruoka Kiyoto
Nakahara Akihiro
Chapman Jeanette
Gordon Raeann
Sumitomo Rubber Industries Ltd.
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