Two-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsJunji Hayashi, Yasumasa Shimizu, Hiroshi Higuchi, Yasushi Ichikawa
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Abstract
Disclosed herein is a two-piece golf ball formed of a solid core and a cover, the solid core being formed from a rubber composition composed of a rubber base material of polybutadiene synthesized by using a catalyst of rare earth element, a small amount of organic peroxide, an unsaturated carboxylic acid and/or a metal salt thereof, an organic sulfur compound, and an inorganic filler, and the cover being formed mainly from a thermoplastic polyurethane material. The two-piece golf ball is by far superior to conventional ones in flying performance, cover durability, coating durability, and shot feeling.
Claims6
A two-piece solid golf ball made up of a solid core and a cover wherein said solid core is formed from a rubber composition composed of (A) 100 parts by weight of rubber base material containing 60 to 100 wt % of polybutadiene synthesized by using a catalyst of rare earth element and contains no less than 60% of cis-1,4-linkage, (B) 0.1 to 0.8 parts by weight of organic peroxide compound, (C) an unsaturated carboxylic acid and/or a metal salt thereof, (D) an organic sulfur compound, and (E) an inorganic filler and said solid core deforms by 3.0 to 5.5 mm under a load of 980 N (100 kgf) and has a diameter of 37 to 42 mm, and said cover is formed mainly from (F) a thermoplastic polyurethane material and has a thickness of 0.5 to 2.5 mm and a Shore D hardness of 50 to 70, and said two-piece solid golf ball made up of a solid core and a cover deforms by 3.0 to 5.0 mm under a load of 980 N (100 kgf).
Dependencies are inferred from the claim text.