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US 9,005,051 B2Granted
Golf ball with a large and soft polymer core
AssigneeNIKE, Inc.
InventorsYasushi Ichikawa, Arthur Molinari
Life of this patent
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Abstract
A golf ball includes a relatively large polymer core and has a soft ball compression. The polymer is, in the illustrated embodiments, a highly neutralized acid polymer. The golf ball may, optionally, include an outer core made of a different material, such as a thermoset polybutadiene rubber. The golf ball may, optionally, include a mantle layer made of an ionomer material. The inner core having a diameter of between 24 mm and 40 mm, and in some designs, between 28 mm and 32 mm, yields increased iron initial velocity and lower iron spin while maintaining driver performance.
Claims9
A golf ball comprising
- an inner core layer, wherein the inner core layer encompasses a center of the golf ball;
- a cover layer, wherein the cover layer is positioned radially outward of the inner core layer and substantially surrounds the inner core layer;
- wherein the inner core layer comprises a highly neutralized polymer;
- and
- wherein the inner core layer has an inner core diameter between 28 mm and 40 mm;
- and
- wherein the inner core layer has a JIS C hardness of about 66, further comprising a first intermediate layer, wherein the first intermediate layer is positioned radially outward of the inner core layer and substantially surrounds the inner core layer, wherein the first intermediate layer comprises a rubber composition.
4 more elements
Dependencies are inferred from the claim text.