Multi-piece golf ball comprising low hardness gradient core
First Claim
1. A golf ball comprising:
- a single core having an outer surface and a geometric center and being formed from a substantially homogenous rubber composition;
an inner cover layer disposed about the core, the inner cover comprising an ionomeric material and having a material hardness of about 60 Shore D or greater; and
an outer cover layer disposed about the inner cover layer, the outer cover comprising a castable polyurea or a castable polyurethane and having a material hardness of about 60 Shore D or less;
wherein the outer surface has a trans content of about 12% or less and a hardness of about 71 to 88 Shore C, the geometric center has a trans content of about 10% or less and a hardness of about 70 to 80 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 10 Shore C to define a shallow positive hardness gradient.
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Accused Products
Abstract
A golf ball includes a single core formed from a substantially homogenous rubber composition, an inner cover disposed about the core, and an outer cover. The inner cover includes an ionomeric material and has a hardness of about 60 Shore D or greater. The outer cover layer is disposed about the inner cover layer, is formed from a castable polyurea or polyurethane, and has a material hardness of about 60 Shore D or less. The outer surface of the core has a trans content of about 12% or less and a hardness of about 71 to 88 Shore C, the geometric center of the core has a trans content of about 10% or less and a hardness of about 70 to 80 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 10 Shore C to define a shallow positive hardness gradient.
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Citations
13 Claims
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1. A golf ball comprising:
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a single core having an outer surface and a geometric center and being formed from a substantially homogenous rubber composition; an inner cover layer disposed about the core, the inner cover comprising an ionomeric material and having a material hardness of about 60 Shore D or greater; and an outer cover layer disposed about the inner cover layer, the outer cover comprising a castable polyurea or a castable polyurethane and having a material hardness of about 60 Shore D or less; wherein the outer surface has a trans content of about 12% or less and a hardness of about 71 to 88 Shore C, the geometric center has a trans content of about 10% or less and a hardness of about 70 to 80 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 10 Shore C to define a shallow positive hardness gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A golf ball comprising:
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a single core having an outer diameter of about 1.5 to 1.55 inches, an outer surface, and a geometric center, and being formed from a substantially homogenous rubber composition; an inner cover layer disposed about the core, the inner cover comprising a thermoplastic ionomeric material having a material hardness of about 66 to 80 Shore D; and an outer cover layer disposed about the inner cover layer, the outer cover having a thickness of about 0.04 inches and comprising an ionomer having a material hardness of about 64 to 68 Shore D or a thermosetting castable polyurethane having a hardness of about 51 to 55 Shore D; wherein the outer surface has a trans content of about 12% or less and a hardness of about 74 to 78 Shore C, the geometric center has a trans content of about 10% or less and a hardness of about 72 to 78 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 5 Shore C to define a shallow positive hardness gradient, the core having an Atti compression of about 50 to 70. - View Dependent Claims (11, 12)
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13. A golf ball comprising:
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a single core having an outer diameter of about 1.45 inches, an outer surface, and a geometric center, and being formed from a substantially homogenous rubber composition; an inner cover layer disposed about the core, the inner cover having an outer diameter of about 1.58 inches and comprising a thermoplastic non-ionomeric material having a material hardness of about 38 to 42 Shore D; and an outer cover layer disposed about the inner cover layer, the outer cover having a thickness of about 0.05 inches and comprising an ionomer having a material hardness of about 66 to 70 Shore D; wherein the outer surface has a trans content of about 12% or less and a hardness of about 74 to 78 Shore C, the geometric center has a trans content of about 10% or less and a hardness of about 72 to 78 Shore C, and the core surface hardness is greater than the geometric center hardness by about 1 to 5 Shore C to define a shallow positive hardness gradient.
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Specification