Patent ID: 6921346
Filing Date: 2005-07-26
Classification: A63B

Abstract:
1. 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% by weight 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 part by weight of organic peroxide compound, (C) an unsaturated carboxylic acid and/or a metal salt thereof, (D) an organic sulfur compound selected from the group consisting of thiophenol, thionaphthol, halogenated thiophenol, and metal salts thereof, and (E) an inorganic filler and said solid core deforms by 3.5 to 6.0 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) 100 parts by weight of a resin composition containing an ionomer resin and (G) 5 to 40 parts by weight of an inorganic filler and has a thickness of 0.5 to 2.5 mm and a Shore D hardness of 50 to 70, and that said two-piece solid golf ball made up of a solid core and a cover deforms by 3.0 to 5.5 mm under a load of 980 N (100 kgf).