Multi-layer core golf ball having opposing hardness gradient with steep gradient outer core layer
First Claim
1. A golf ball comprising:
- an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous composition throughout such that the geometric center has a hardness of 51 to 76 Shore C and the first outer surface has a hardness of 50 to 75 Shore C;
an outer core layer disposed about the inner core, the outer core layer having a second outer surface having a hardness of 85 to 98 Shore C and an inner surface having a hardness of 68 to 78 Shore C and being formed from a second substantially homogenous rubber composition throughout, the rubber composition comprising a base rubber and a resorcinol; and
a cover layer disposed about the outer core layer;
wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the second outer surface being greater than the hardness of the inner surface to define a positive hardness gradient of greater than 15 Shore C, and the hardness of the first outer surface being lower than the hardness of the geometric center to define a negative hardness gradient of −
1 to −
5 Shore C.
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Accused Products
Abstract
A golf ball comprising an inner core having an outer surface and a geometric center and being formed from a substantially homogenous composition such that the geometric center has a hardness of 51 to 76 Shore C and the outer surface has a hardness of 50 to 75 Shore C. An outer core layer is disposed about the inner core and has an outer surface having a hardness of 85 to 98 Shore C and an inner surface having a hardness of 68 to 78 Shore C and being formed from a second substantially homogenous rubber composition, the rubber composition comprising a base rubber and a resorcinol. A cover layer is disposed about the outer core layer. The hardness of the second outer surface is greater than the hardness of the inner surface to define a positive hardness gradient of greater than 15 Shore C, and the hardness of the first outer surface is lower than the hardness of the geometric center to define a negative hardness gradient of −1 to −5 Shore C.
116 Citations
20 Claims
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1. 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 composition throughout such that the geometric center has a hardness of 51 to 76 Shore C and the first outer surface has a hardness of 50 to 75 Shore C; an outer core layer disposed about the inner core, the outer core layer having a second outer surface having a hardness of 85 to 98 Shore C and an inner surface having a hardness of 68 to 78 Shore C and being formed from a second substantially homogenous rubber composition throughout, the rubber composition comprising a base rubber and a resorcinol; and a cover layer disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the second outer surface being greater than the hardness of the inner surface to define a positive hardness gradient of greater than 15 Shore C, and the hardness of the first outer surface being lower than the hardness of the geometric center to define a negative hardness gradient of −
1 to −
5 Shore C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 composition throughout such that the geometric center has a hardness of 56 to 80 Shore C and the first outer surface has a hardness of 50 to 75 Shore C; an outer core layer disposed about the inner core, the outer core layer having a second outer surface having a hardness of 85 to 98 Shore C and an inner surface having a hardness of 68 to 78 Shore C and being formed from a second substantially homogenous rubber composition throughout, the rubber composition comprising a base rubber and a resorcinol; and a cover layer disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the second outer surface being greater than the hardness of the inner surface to define a positive hardness gradient of greater than 15 Shore C, and the hardness of the first outer surface being lower than the hardness of the geometric center to define a negative hardness gradient of −
6 Shore C or greater. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification