Golf balls having multi-layer cores based on polyalkenamer compositions
First Claim
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1. A golf ball comprising:
- an inner core layer having an outer surface and geometric center, the inner core being formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.600 inches, wherein the outer surface hardness is 20 Shore C to 85 Shore C and the center hardness is 40 Shore C to 65 Shore C;
an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of 25 Shore C to 85 Shore C;
an outer core layer formed from a second thermoset rubber composition and having a thickness of 0.010 inches to 0.100 inches and an outer surface hardness that is greater than the Shore C outer surface hardness of the inner core layer, the outer surface hardness being in the range of range of 45 Shore C to 90 Shore C; and
a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 60 Shore C or greater;
wherein at least one of the center, intermediate core layer, and outer core layer comprises a polyalkenamer rubber composition, the polyalkenamer being present in the composition in an amount of at least 50 weight percent.
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Abstract
The present invention generally relates to golf balls and more particularly to golf balls having multi-layered cores comprising a thermoset rubber center, a thermoplastic intermediate core layer, and a thermoset rubber outer core layer. A cover layer is disposed about the multi-layered core. At least one of the center, intermediate core layer, and outer core layer comprises a polyalkenamer rubber. The polyalkenamer rubber may be blended with other rubbers such as polybutadiene, polyisoprene, ethylene propylene diene, and styrene-butadiene rubbers. The polyalkenamer rubber composition helps improve resiliency of the core and provides the ball with a comfortable and soft feel.
67 Citations
18 Claims
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1. A golf ball comprising:
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an inner core layer having an outer surface and geometric center, the inner core being formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.600 inches, wherein the outer surface hardness is 20 Shore C to 85 Shore C and the center hardness is 40 Shore C to 65 Shore C; an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of 25 Shore C to 85 Shore C; an outer core layer formed from a second thermoset rubber composition and having a thickness of 0.010 inches to 0.100 inches and an outer surface hardness that is greater than the Shore C outer surface hardness of the inner core layer, the outer surface hardness being in the range of range of 45 Shore C to 90 Shore C; and a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 60 Shore C or greater; wherein at least one of the center, intermediate core layer, and outer core layer comprises a polyalkenamer rubber composition, the polyalkenamer being present in the composition in an amount of at least 50 weight percent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A golf ball comprising:
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an inner core layer having an outer surface and geometric center, the inner core being formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.600 inches, wherein the outer surface hardness is 50 Shore C to 95 Shore C and the center hardness is 40 Shore C to 75 Shore C; an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of 25 Shore C to 85 Shore C; an outer core layer formed from a second thermoset rubber composition and having a thickness of 0.010 inches to 0.100 inches and an outer surface hardness that is less than the Shore C outer surface hardness of the Inner core layer, the outer surface hardness being in the range of range of 45 Shore C to 90 Shore C; and a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 60 Shore C or greater; wherein at least one of the center, intermediate core layer, and outer core layer comprises a polyalkenamer rubber composition, the polyalkenamer being present in the composition in an amount of at least 50 weight percent. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification