Patent ID: 6786840
Filing Date: 2004-09-07
Classification: A63B,C08K

Abstract:
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 a polybutadiene which is synthesized with 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, (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 a mixture of (M) a block copolymer having amino groups at its terminals and (N) an ionomer resin, with the ratio of (M)/(N) being from 3/97 to 60/40 (by weight) 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 5.0 mm under a load of 980 N (100 kgf).