Golf ball core having medium positive hardness gradient and high surface hardness
First Claim
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1. A golf ball comprising:
- a core comprising an inner core layer and an outer core layer, the inner core layer having a geometric center hardness of 66 to 80 Shore C and a surface hardness of 68 to 80 Shore C and being up to 5 Shore C harder than the center hardness to define a shallow positive hardness gradient;
an outer cover layer having a Vicker'"'"'s hardness of about 0.18 to 0.40 as measured on the ball at 0.49 N with a 10-s hold time; and
an inner cover layer comprising an ionomer and being disposed between the core and the outer cover layer;
wherein the outer core layer has a surface hardness of 86 to 96 Shore C and is harder than the geometric center by about 10 to 20 Shore C to define a positive hardness gradient.
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Abstract
A golf ball includes a single solid core having a surface hardness and a geometric center hardness. The core has an outer diameter of about 1.5 to 1.62 inches. An outer cover layer formed from a polyurea or polyurethane has a first hardness, and an inner cover layer, disposed between the core and the outer cover, has a second hardness greater than the first hardness and within 5 Shore C of the core surface hardness. The geometric center hardness is about 64 to 85 Shore C, and the core surface hardness is greater than 85 Shore C and harder than the geometric center hardness by about 5 to 22 Shore C to define a positive hardness gradient.
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Citations
9 Claims
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1. A golf ball comprising:
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a core comprising an inner core layer and an outer core layer, the inner core layer having a geometric center hardness of 66 to 80 Shore C and a surface hardness of 68 to 80 Shore C and being up to 5 Shore C harder than the center hardness to define a shallow positive hardness gradient; an outer cover layer having a Vicker'"'"'s hardness of about 0.18 to 0.40 as measured on the ball at 0.49 N with a 10-s hold time; and an inner cover layer comprising an ionomer and being disposed between the core and the outer cover layer; wherein the outer core layer has a surface hardness of 86 to 96 Shore C and is harder than the geometric center by about 10 to 20 Shore C to define a positive hardness gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification