| US 7,452,290 B2 | ||
| Golf balls having a low modulus HNP layer and a high modulus HNP layer | ||
| Michael J. Sullivan, Barrington, R.I. (US); Derek A. Ladd, Acushnet, Mass. (US); Edmund A. Hebert, Fairhaven, Mass. (US); and Murali Rajagopalan, South Dartmouth, Mass. (US) | ||
| Assigned to Acushnet Company, Fairhaven, Mass. (US) | ||
| Filed on Mar. 30, 2007, as Appl. No. 11/694,007. | ||
| Application 11/694007 is a continuation of application No. 11/304962, filed on Dec. 15, 2005, granted, now 7,207,903. | ||
| Application 11/304962 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 2007/0173352 A1, Jul. 26, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 37/06 (2006.01) | ||
| U.S. Cl. 473—374 | 14 Claims |
| 1. A golf ball comprising:
(a) an inner core layer 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;
(b) 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; and
(c) a cover;
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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