GOLF BALL COMPRISING A CORE LAYER HAVING A HARDNESS GRADIENT AND TRANS GRADIENT
First Claim
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1. A golf ball comprising:
- a core having an outer surface and a geometric center and being formed from a first substantially homogenous rubber composition;
an intermediate layer disposed about the core and comprising an ionomeric material; and
a cover layer disposed about the intermediate layer, the cover comprising a castable polyurea or a castable polyurethane;
wherein the outer surface has a trans content of about 6% to 10%, the geometric center has a trans content of about 1% to 3%, and the trans content of the outer surface is greater than the trans content of the geometric center by about 6% or greater to define a trans gradient.
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Abstract
A golf ball includes a ‘dual core’ formed from an inner core layer and an outer core layer. The inner core has an outer surface and a center and is typically formed from a substantially-homogenous rubber composition such that the center of the core has a hardness of about 72 Shore C to about 78 Shore C and a trans content of about 5% to 9%, and the outer surface of the inner core has a trans content of about 5% to 9%. The trans content of the outer surface and the center of the inner core are preferably within 2% of each other and, more preferably are substantially the same to define a zero trans gradient along a radius of the inner core.
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Citations
18 Claims
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1. A golf ball comprising:
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a core having an outer surface and a geometric center and being formed from a first substantially homogenous rubber composition; an intermediate layer disposed about the core and comprising an ionomeric material; and a cover layer disposed about the intermediate layer, the cover comprising a castable polyurea or a castable polyurethane; wherein the outer surface has a trans content of about 6% to 10%, the geometric center has a trans content of about 1% to 3%, and the trans content of the outer surface is greater than the trans content of the geometric center by about 6% or greater to define a trans gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A golf ball comprising:
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an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous rubber composition such that the geometric center has a hardness of about 72 Shore C to about 78 Shore C and a trans content of about 5% to 9% and the first outer surface has a trans content of about 5% to 9%; an outer core layer disposed about the inner core and being formed from a second substantially homogenous rubber composition such that the outer core layer has a trans content of about 15% to 25%; and a cover layer disposed about the outer core layer comprising a castable polyurea or a castable polyurethane; wherein a hardness of the first outer surface is 57 Shore C to 63 Shore C and is lower than a hardness of the geometric center to define a negative hardness of about −
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15, and the trans content of the first outer surface and the geometric center are substantially the same. - View Dependent Claims (9, 10, 11)
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12. A golf ball comprising:
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an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous rubber composition such that the geometric center has a hardness of about 52 Shore C to about 58 Shore C, and the first outer surface has a trans content of about 15% to 25%, the geometric center has a trans content of about 10% to 15%, and the trans content of the outer surface is greater than the trans content of the geometric center by about 10% to 15% to define a trans gradient; an outer core layer disposed about the inner core and being formed from a second substantially homogenous rubber composition such that the outer core layer has a trans content of about 6% to 12%; and a cover layer disposed about the outer core layer comprising a castable polyurea or a castable polyurethane; wherein a hardness of the first outer surface is about 72 to 78 Shore C and is greater than a hardness of the geometric center to define a positive hardness gradient of about 1 to 20.
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13. A golf ball comprising:
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an inner core having an outer surface and a geometric center and being formed from a first substantially homogenous rubber composition; an outer core layer disposed about the inner core and being formed from a second substantially homogenous rubber composition, the outer core layer having a trans gradient of about 20% to 45%; and a cover layer disposed about the outer core layer; wherein the outer surface has a trans content of about 6% to 10%, the geometric center has a trans content of about 1% to 3%, and the trans content of the outer surface is greater than the trans content of the geometric center by about 6% or greater to define a trans gradient.
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- 14. The golf ball of claim 14, wherein the outer core layer has a surface trans content substantially greater than a trans content of an outer core layer inner surface.
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17. The golf ball of claim 17, wherein the negative hardness gradient is about −
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Specification