Multi-piece solid golf ball

摘要

The invention provides a multi-piece solid golf ball having a core, an envelope layer which encloses the core, an intermediate layer which encloses the envelope layer, and a cover which encloses the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is formed primarily of a rubber material, the envelope layer is formed primarily of a specific resin mixture, the intermediate layer is formed primarily of a resin material, and the cover is formed primarily of polyurethane. The intermediate layer and the cover have surface hardnesses (Durometer D hardness) which satisfy the relationship: intermediate layer surface hardness>cover surface hardness. The golf ball has an excellent flight performance and controllability that are acceptable to professionals and other skilled golfers, while also having an excellent durability to cracking on repeated impact and an excellent scuff resistance.

主权项

1. A multi-piece solid golf ball comprising a core, an envelope layer which encloses the core, an intermediate layer which encloses the envelope layer, and a cover which encloses the intermediate layer and has formed on a surface thereof a plurality of dimples, wherein the core is formed primarily of a rubber material; the envelope layer is formed primarily of a mixture comprising:
100 parts by weight of a resin component composed of, in admixture, a base resin of (a) an olefin-unsaturated carboxylic acid binary random copolymer and/or a metal ion-neutralized product of an olefin-unsaturated carboxylic acid binary random copolymer mixed with (b) an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer and/or a metal ion-neutralized product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary random copolymer in a weight ratio between 100:0 and 0:100, and (e) a non-ionomeric thermoplastic elastomer in a weight ratio between 100:0 and 50:50, (c) 5 to 80 parts by weight of a fatty acid and/or fatty acid derivative having a molecular weight of 280 to 1500, and (d) 0.1 to 10 parts by weight of a basic inorganic metal compound capable of neutralizing un-neutralized acid groups in the base resin and component (c); the intermediate layer is formed primarily of a resin material; the cover is formed primarily of polyurethane; and the intermediate layer and the cover have surface hardnesses (Durometer D hardness) which satisfy the relationship intermediate layer surface hardness>cover surface hardness; the envelope layer and the intermediate layer have surface hardnesses which satisfy the relationship envelope layer surface hardness