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US 9,789,367 B2Granted
Thermoplastic dual core having a negative gradient inner core and a positive gradient outer core
AssigneeAcushnet Company
InventorsMichael J. Sullivan, Brian Comeau, William B. Lacy
Life of this patent
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Abstract
A golf ball including a thermoplastic inner core layer that has a geometric center hardness greater than its surface hardness to define a negative hardness gradient. An outer core layer is disposed about the inner core and is formed from a thermoplastic material and has an inner surface hardness substantially less than its outer surface hardness to define a positive hardness gradient. An inner cover layer is disposed about the outer core layer and an outer cover layer is disposed about the inner cover layer.
Claims9
A golf ball comprising:
- an inner core layer comprising a first thermoplastic material and having a geometric center hardness greater than a surface hardness to define a negative hardness gradient, wherein the inner core surface hardness is about 40 Shore C to about 60 Shore C;
- an outer core layer disposed about the inner core, the outer core layer comprising a second thermoplastic material and having an inner surface hardness substantially less than an outer surface hardness to define a positive hardness gradient;
- an inner cover layer disposed outer core layer;
- and
- an outer cover layer disposed about the inner cover layer.
2 more elements
A golf ball comprising:
- an inner core layer comprising a first thermoplastic material and having a geometric center hardness greater than a surface hardness to define a negative hardness gradient between −1 Shore C and −5 Shore C;
- an outer core layer disposed about the inner core layer, the outer core layer comprising a second thermoplastic material and having an inner surface hardness less than an outer surface hardness to define a substantially positive hardness gradient of at least 5 Shore C;
- and
- a cover layer disposed outer core layer, the cover layer comprising an inner cover layer comprising an ionomer and an outer cover layer comprising a castable polyurethane or polyurea material.
1 more element
A golf ball comprising:
- an inner core layer comprising a first thermoplastic material and having a geometric center hardness greater than a surface hardness to define a negative hardness gradient between −1 Shore C and −5 Shore C, the center hardness being about 25 Shore C to about 50 Shore C and the surface hardness being about 20 Shore C to about 47 Shore C;
- an outer core layer disposed about the inner core layer, the outer core layer comprising a second thermoplastic material and having an inner surface hardness less than an outer surface hardness to define a positive hardness gradient of at least 5 Shore C;
- and
- a cover layer disposed outer core layer, the cover layer comprising an inner cover layer comprising an ionomer and an outer cover layer comprising a castable polyurethane or polyurea material.
1 more element
Dependencies are inferred from the claim text.