Multi-layer core golf ball
First Claim
1. A golf ball comprising:
- an inner core having a compression of less than about 40;
at least one intermediate layer surrounding the inner core, having a hardness of at least about 55 Shore D, and a specific gravity greater than a specific gravity of the inner core; and
a cover surrounding the intermediate layer comprised of an acrylic acid ionomer having an acid content of between 13% and 16%;
wherein the inner core has a hardness less than a hardness of the intermediate layer and wherein a ratio of flexural modulus (ksi) to Shore D hardness for the cover is less than about 1.0 and a first COR of the inner core and the intermediate layer is less than a second COR of the entire ball.
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Accused Products
Abstract
The present invention is directed to an improved multi-layer golf ball displaying enhanced playing characteristics, including high speed, high launch, and low spin. In general the golf ball displays improved performance in areas such as distance and feel for lower swing speed players. The ball has a relatively large solid inner core, with at least one solid outer core layer surrounding the inner core, and a thin cover layer surrounding the outermost core layer. The inner core is softer than the outer core, which in turn is softer than the cover. The ball may be designed such that the coefficient of restitution (COR) gradient is from slow to fast; that is, the inner core has a lower COR than the total core, which has a lower COR than the entire golf ball.
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Citations
19 Claims
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1. A golf ball comprising:
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an inner core having a compression of less than about 40; at least one intermediate layer surrounding the inner core, having a hardness of at least about 55 Shore D, and a specific gravity greater than a specific gravity of the inner core; and a cover surrounding the intermediate layer comprised of an acrylic acid ionomer having an acid content of between 13% and 16%; wherein the inner core has a hardness less than a hardness of the intermediate layer and wherein a ratio of flexural modulus (ksi) to Shore D hardness for the cover is less than about 1.0 and a first COR of the inner core and the intermediate layer is less than a second COR of the entire ball. - 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; at least one intermediate core layer surrounding the inner core having a specific gravity larger than a specific gravity of the inner core; at least one outer core layer surrounding the intermediate core layer having a specific gravity larger than the specific gravity of the intermediate core layer; and a cover surrounding the outer core layer having a specific gravity smaller than the specific gravity of the outer core layer, wherein a ratio of flexural modulus (ksi) to Shore D hardness for the cover is less than about 1.0. - View Dependent Claims (12, 13)
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14. A golf ball comprising:
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an inner core having a compression of less than about 60; at least one outer core layer surrounding the inner core, having a hardness of at least about 55 Shore D, and a specific gravity greater than a specific gravity of the inner core; and a cover surrounding the outer core layer; wherein the inner core has a hardness less than a hardness of the outer core, and wherein the inner core layer comprises a unfilled highly neutralized thermoplastic ionomer (HNP) having a specific gravity of less than 0.95. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification