Patent ID: 6656059
Filing Date: 2003-12-02
Classification: A63B

Abstract:
A multi-piece solid golf ball comprising an elastic solid core, a resinous cover enclosing the core and formed with a plurality of dimples, and an intermediate layer between the core and the cover, wherein said intermediate layer is made of a resin composition comprising at least 70 parts by weight of ionomer resin; the resin composition being comprised of:(a) 100 parts by weight of an olefin/unsaturated carboxylic acid random copolymer, an olefin/unsaturated carboxylic acid/unsaturated carboxylic acid ester random copolymer, a metal ion neutralization product of either type of copolymer, or a mixture of any of the copolymers and the neutralization products thereof; (b) 5 to 80 parts by weight of a fatty acid having a molecular weight of at least 280 or a derivative thereof; (c) 0.1 to 10 parts by weight of a basic inorganic metal compound capable of neutralizing the acid groups in components (a) and (b); and wherein when subjected to a load of 1274 N (130 kgf) from an initial load of 98 N (10 kgf), the solid core undergoes a deformation A, a sphere consisting of the solid core and the intermediate layer enclosing the core undergoes a deformation B, and the golf ball undergoes a deformation C, all expressed in millimeters, which satisfy the relationship: 1.14&lE;A/B&lE;1.30 and 1.05&lE;B/C&lE;1.16.