| US 7,517,289 B2 | ||
| Golf balls having two or more core layers formed from HNP compositions | ||
| Michael J. Sullivan, Barrington, R.I. (US); Derek A. Ladd, Acushnet, Mass. (US); Edmund A. Hebert, Mattapoisett, Mass. (US); and Murali Rajagopalan, South Dartmouth, Mass. (US) | ||
| Assigned to Acushnet Company, Fairhaven, Mass. (US) | ||
| Filed on Apr. 23, 2007, as Appl. No. 11/738,759. | ||
| Application 11/738759 is a continuation in part of application No. 11/304863, filed on Dec. 15, 2005, granted, now 7,211,008. | ||
| Application 11/304863 is a continuation in part of application No. 10/797810, filed on Mar. 10, 2004, granted, now 6,988,962. | ||
| Application 10/797810 is a continuation in part of application No. 10/797699, filed on Mar. 10, 2004, granted, now 6,981,926. | ||
| Prior Publication US 2007/0207880 A1, Sep. 06, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—376 | 9 Claims |
| 1. A golf ball comprising:
(a) an inner core layer formed from a diene rubber composition;
(b) an outer core layer formed from a first HNP composition, the first HNP composition having a Shore D hardness of 45 or
greater and comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer;
(c) an intermediate core layer disposed between the inner core layer and the outer core layer and formed from a second HNP
composition, the second HNP composition having a Shore D hardness of 55 or less and comprising a highly neutralized ethylene/(meth)acrylic
acid copolymer;
(d) a cover; wherein the Shore D hardness of the first HNP composition is greater than the Shore D hardness of the second HNP composition.
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