Multi-piece solid golf ball
View Patent ↗The present invention provides a multi-piece solid golf ball, which is superior in flight distance, spin performance and shot feel. The present invention relates to a multi-piece solid golf ball comprising a core consisting of a center and an intermediate layer, and a cover, wherein the center has surface hardness (D) higher than central point hardness by not less than 15, the intermediate layer and cover are formed from thermoplastic resin as a main component and have a thickness of not less than 0.3 to less than 1.0 mm, the cover has a hardness (F) of not less than 35 to less than 55, a hardness of the intermediate layer is higher than D and F, and a difference (A−B) between a deformation amount of the core (A) and that of the golf ball (B) is within the range of not less than 0.15 to less than 0.35 mm.
1. A multi-piece solid golf ball which consists essentially of a core consisting of a center and an intermediate layer formed on the center, and a cover covering the core, wherein
the center has a diameter of not less than 39.2 mm to less than 41.3 mm, a surface hardness in Shore D hardness higher than a central point in Shore D hardness by 15 to 40,
the intermediate layer is formed from thermoplastic resin as a main component and has a thickness of not less than 0.3 to less than 1.0 mm,
the cover is formed from a polyurethane-based thermoplastic elastomer formed by using cycloaliphatic diisocyanate as a main component, and has a thickness of not less than 0.3 to less than 1.0 mm and a hardness in Shore D hardness of not less than 35 to less than 55,
a hardness in Shore D hardness of the intermediate layer is higher than the surface hardness of the center and the hardness of the cover, and
when a deformation amount of the center and that of the core when applying from an initial load of 98 N to a final load of 1275 N are represented by “A (mm)” and “B (mm)” respectively, the value of deformation amount difference (A−B) is within the range of not less than 0.15 mm to less than 0.35 mm.
2. The multi-piece solid golf ball according to claim 1 , wherein the intermediate layer has a hardness in Shore D hardness of not less than 62 to less than 65.
3. The multi-piece solid golf ball according to claim 1 , wherein the polyurethane-based thermoplastic elastomer of the cover is formed by using 4,4′ dicyclohexylmethane diisocyanate.
4. A multi-piece solid golf ball comprising a core containing a center and an intermediate layer formed on the center, and a cover covering the core, wherein
the center has a surface hardness in Shore D hardness higher than a central point in Shore D hardness by 15 to 40 and has a diameter of not less than 39.2 mm to less than 41.3 mm,
the intermediate layer is formed from an ionomer resin as a main component and has a thickness of not less than 0.3 to less than 1.0 mm,
the cover is formed from a polyurethane-based thermoplastic elastomer as a main component, and has a thickness of not less than 0.3 to less than 1.0 mm and a hardness in Shore D hardness of not less than 35 to less than 55,
the hardness, in Shore D hardness, of the intermediate layer is higher than the surface hardness of the center and the hardness of the cover, and
when a deformation amount of the center and that of the core when applying from an initial load of 98 N to a final load of 1275 N are represented by “A (mm)” and “B (mm)” respectively, the value of the deformation amount difference (A−B) is within the range of not less than 0.15 mm to less than 0.35 mm.
5. The multi-piece solid golf ball according to claim 4 , wherein the intermediate layer has a hardness, in Shore D hardness, of not less than 62 to less than 65.
6. The multi-piece solid golf ball according to claim 4 , wherein the polyurethane-based thermoplastic elastomer of the cover is formed using cycloaliphatic diisocyanate.