Solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHiroshi Higuchi, Hisashi Yamagishi, Yasushi Ichikawa, Junji Hayashi
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Abstract
In a solid golf ball having a solid core, a cover inner layer and a cover outer layer, the inner layer is formed of a thermoplastic resin containing 60-100% by weight of an ionomer resin neutralized with a monovalent metal salt, and the outer layer is formed of a thermoplastic resin containing 60-100% by weight of an ionomer resin neutralized with a divalent metal salt. The difference in Shore D hardness between the inner and outer layers is within 5 Shore units. While maintaining superior flight performance and durability, the inventive ball presents a more pleasant feel.
Claims14
A solid golf ball comprising a solid core and a cover consisting of an inner layer and an outer layer, characterized in that
- the cover inner layer is formed of a thermoplastic resin containing 60 to 100% by weight of an ionomer resin neutralized with a monovalent metal salt and has a Shore D hardness of 50 to 68,
- the cover outer layer is formed of a thermoplastic resin containing 60 to 100% by weight of an ionomer resin neutralized with a divalent metal salt, and
- the difference in hardness between the cover inner layer and the cover outer layer is within 5 on Shore D hardness scale.
A multi-piece golf ball comprising:
- a core composed substantially of a rubber composition, and having a diameter of about 35 to 40 mm;
- an inner cover layer formed of a thermoplastic resin containing 60 to 100% by weight of an ionomer resin neutralized with a monovalent metal salt, having a gage of about 1.6 to 2.2 mm, and a Shore D hardness of about 51 to 66;
- and
- an outer cover layer formed of a thermoplastic resin containing 60 to 100% by weight of an ionomer resin neutralized with a divalent metal salt, having a gage of about 1.3 to 1.8 mm, and a Shore D hardness of about 51 to 66, and wherein the difference in the Shore D hardness between the inner and outer cover layers is less than 5 degrees.
Dependencies are inferred from the claim text.