| US 8,308,585 B2 | ||
| Golf balls having a low modulus HNP layer and a high modulus HNP layer | ||
| Jeffrey L. Dalton, Mamaroneck, N.Y. (US); William E. Morgan, Barrington, R.I. (US); Michael J. Sullivan, Barrington, R.I. (US); and Derek A. Ladd, Acushnet, Mass. (US) | ||
| Assigned to Acushnet Company, Fairhaven, Mass. (US) | ||
| Filed on Apr. 7, 2011, as Appl. No. 13/81,609. | ||
| Application 13/081,609 is a continuation of application No. 12/204,913, filed on Sep. 5, 2008, granted, now 7,935,004. | ||
| Application 12/204,913 is a continuation in part of application No. 11/694,007, filed on Mar. 30, 2007, granted, now 7,452,290. | ||
| Application 11/694,007 is a continuation in part of application No. 11/972,227, filed on Jan. 10, 2008, abandoned. | ||
| Prior Publication US 2011/0250990 A1, Oct. 13, 2011 | ||
| 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 core and a cover, wherein the core has an overall diameter of from 1.400 inches to 1.660 inches
and consists of:
an inner core layer having a diameter of from 0.125 inches to 0.750 inches, an outer surface hardness of 70 Shore C or greater,
and formed from a low modulus HNP composition, the low modulus HNP composition comprising a highly neutralized ethylene/(meth)acrylic
acid/alkyl (meth)acrylate copolymer having a modulus of from 1,000 psi to 50,000 psi; and
an outer core layer formed from a high modulus HNP composition, the high modulus HNP composition comprising a highly neutralized
ethylene/(meth)acrylic acid copolymer having a modulus of from 25,000 psi to 150,000 psi;
wherein the modulus of the highly neutralized copolymer of the low modulus HNP composition is at least 10% less than the modulus
of the highly neutralized copolymer of the high modulus HNP composition.
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