Golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsKae Ilzuka, Tsuyoshi Nakajima, Yuichiro Ozawa
Life of this patent
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Abstract
The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition containing (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate, and has a hysteresis loss of 50% or less when compressed at a load cell speed of 500 mm/min and under a constant load of 5,000 N.
Claims20
A golf ball comprising a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition comprising the following components A to C:
- (A) a base rubber,
- (B) an organic peroxide, and
- (C) water,
- wherein the golf ball has a hardness at an interior thereof such that a value obtained by subtracting a JIS-C hardness H5.0 at a position 5.0 mm outward from a center of the core and toward a periphery of the core from a JIS-C hardness H15.0 at a position 15.0 mm outward from the core center and toward the core periphery is a positive value and not more than 18.3,
- wherein the amount of the water included per 100 parts by weight of the base rubber serving as component A is from 0.1 to 5 parts by weight.
A golf ball comprising a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition comprising the following components A to C:
- (A) a base rubber,
- (B) an organic peroxide, and
- (C) water and/or a metal monocarboxylate,
- wherein the golf ball has a hardness at an interior thereof such that a value obtained by subtracting a JIS-C hardness H5.0 at a position 5.0 mm outward from a center of the core and toward a periphery of the core from a JIS-C hardness H15.0 at a position 15.0 mm outward from the core center and toward the core periphery is a positive value and not more than 18.3,
- wherein the core has a JIS-C hardness difference obtained by subtracting a hardness at the center of the core from a hardness at a surface of the core which is at least 20.
A golf ball comprising a core and a cover of one layer or a plurality of layers, wherein the core is formed of a material molded under heat from a rubber composition comprising the following components A to C:
- (A) a base rubber,
- (B) an organic peroxide, and
- (C) water and/or a metal monocarboxylate,
- wherein the golf ball has a hardness at an interior thereof such that a value obtained by subtracting a JIS-C hardness H5.0 at a position 5.0 mm outward from a center of the core and toward a periphery of the core from a JIS-C hardness H15.0 at a position 15.0 mm outward from the core center and toward the core periphery is a positive value and not more than 18.3,
- wherein a moisture content at the core center is from 1,000 to 7,000 ppm.
Dependencies are inferred from the claim text.