Multi-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsJunji Hayashi, Hisashi Yamagishi, Hiroshi Higuchi, Yasumasa Shimizu
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Abstract
In a multi-piece solid golf ball comprising a solid core, an enclosure layer, an intermediate layer, and a cover, the enclosure layer and the intermediate layer each have a Shore D hardness of 10-50, the enclosure layer's Shore D hardness≦the intermediate layer's Shore D hardness≦the cover's Shore D hardness, and the deflections under a load of 100 kg of the solid core, a first spherical body consisting of the solid core and the enclosure layer, a second spherical body consisting of the solid core, the enclosure layer and the intermediate layer, and the ball are controlled to fall in specific ranges. The cover is formed of a cover stock comprising an ionomer resin and an inorganic filler.
Claims25
A multi-piece solid golf ball comprising;
- a solid core, an enclosure layer around the core, said enclosure layer composed primarily of a thermoplastic resin, an intermediate layer of at least one layer around the enclosure layer, and a cover of at least one layer around the intermediate layer, said cover having a Shore D hardness in the range of 50 to 65, wherein
- said enclosure layer and said intermediate layer each have a Shore D hardness of 10 to 50, the Shore D hardness of said enclosure layer is not greater than the Shore D hardness of said intermediate layer which is not greater than the Shore D hardness of said cover, and
- provided that said solid core has a deflection A (mm) under an applied load of 100 kg, a first spherical body consisting of said solid core and said enclosure layer has a deflection B (mm) under an applied load of 100 kg, a second spherical body consisting of said solid core, said enclosure layer and said intermediate layer has a deflection C (mm) under and applied load of 100 kg, and the ball has a deflection D (mm) under an applied load of 100 kg, these deflection values satisfy the relationship that A is from 3.4 to 6.8 mm, B is from 2.3 to 7.0 mm, C is from 2.3 to 6.5 mm and D is from 2.3 to 6.0 mm and wherein:
- 0.85≦B/A≦1.15, 0.85≦C/B≦115 and 0.7≦D/C≦1.0.
A multi-piece solid golf ball comprising;
- a solid core, an enclosure layer of at least one layer around the core, said enclosure layer composed primarily of a thermoplastic resin, an intermediate layer around the enclosure layer, and a cover of at least one layer around the intermediate layer, wherein
- said enclosure layer and said intermediate layer each have a Shore D hardness of 10 to 50, the Shore D hardness of said enclosure layer is not greater than the Shore D hardness of said intermediate layer which is not greater than the Shore D hardness of said cover, and
- said cover is formed of a cover stock comprising a thermoplastic resin as a base component and an inorganic filler, said cover has a Shore D hardness in the range of 50 to 65, and
- provided that said solid core has a deflection A (mm) under an applied load of 100 kg, a first spherical body consisting of said solid core and said enclosure layer has a deflection B (mm) under an applied load of 100 kg, a second spherical body consisting of said solid core, said enclosure layer and said intermediate layer has a deflection C (mm) under an applied load of 100 kg, and the ball has a deflection D (mm) under an applied load of 100 kg, these deflection values satisfy the relationship that A is from 3.4 to 6.8 mm, B is from 2.3 to 7.0 mm, C is from 2.3 to 6.5 mm and D is from 2.3 to 6.0 mm and wherein:
- 0.85≦B/A≦1.15, 0.85≦C/B≦1.15, and 0.7≦D/C≦1.0.
Dependencies are inferred from the claim text.