Fully-neutralized ionomers for use in golf ball having a large core and a thin, dense layer
First Claim
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1. A golf ball comprising:
- a core comprising a highly-neutralized thermoplastic polymer formed from a copolymer of ethylene and an α
,β
-unsaturated carboxylic acid, a salt of an organic acid, and sufficient cation source to fully-neutralize the acid groups of the copolymer;
an outer cover layer; and
an inner cover layer disposed between the center and the outer cover layer, the inner cover layer having a specific gravity of 2.5 g/cc or greater;
wherein the core has an outer diameter of 1.58 inches or greater and a coefficient of restitution of 0.805 or greater.
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Abstract
A golf ball comprising a core comprising a highly-neutralized thermoplastic polymer formed from a copolymer of ethylene and an α,β-unsaturated carboxylic acid, a salt of an organic acid, and sufficient cation source to filly-neutralize the acid groups of the copolymer; an outer cover layer; and an inner cover layer disposed between the center and the outer cover layer, the inner cover layer having a specific gravity of 2.5 g/cc or greater; wherein the core has an outer diameter of 1.58 inches or greater and a coefficient of restitution of 0.805 or greater when measured at an incoming velocity of 125 ft/s.
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Citations
20 Claims
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1. A golf ball comprising:
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a core comprising a highly-neutralized thermoplastic polymer formed from a copolymer of ethylene and an α
,β
-unsaturated carboxylic acid, a salt of an organic acid, and sufficient cation source to fully-neutralize the acid groups of the copolymer;an outer cover layer; and an inner cover layer disposed between the center and the outer cover layer, the inner cover layer having a specific gravity of 2.5 g/cc or greater; wherein the core has an outer diameter of 1.58 inches or greater and a coefficient of restitution of 0.805 or greater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A golf ball comprising:
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a core comprising a center and an outer core layer, both the center and outer core layers comprising a highly-neutralized thermoplastic polymer formed from a copolymer of ethylene and an α
,β
-unsaturated carboxylic acid, a salt of an organic acid, and sufficient cation source to fully-neutralize the acid groups of the copolymer;an outer cover layer; and an inner cover layer disposed between the center and the outer cover layer, the inner cover layer having a specific gravity of 4.0 g/cc or greater; wherein the core has an outer diameter of 1.58 inches or greater and a coefficient of restitution of 0.805 or greater.
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20. A golf ball comprising:
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a core having a first specific gravity and comprising a highly-neutralized thermoplastic polymer formed from a copolymer of ethylene and an α
,β
-unsaturated carboxylic acid, a magnesium salt of an organic acid, and sufficient cation source to fully-neutralize the acid groups of the copolymer;a outer cover layer comprising a castable polyurea, polyurethane, or a mixture thereof, and having a thickness of 0.005 inches to 0.015 inches and a Shore D hardness of 60 or greater; and an inner cover layer disposed between the center and the outer cover layer, the inner cover layer comprising the highly-neutralized thermoplastic polymer and having a second specific gravity at least 5 times greater than the first specific gravity; wherein the core has an outer diameter of 1.58 inches to 1.62 inches and a coefficient of restitution of 0.810 or greater.
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Specification