Golf balls having a low modulus HNP layer and a high modulus HNP layer
First Claim
1. A golf ball comprising:
- (a) an inner core layer formed from a diene rubber composition and having a diameter of from 0.500 inches to 1.580 inches;
(b) an outer core layer formed from a high modulus HNP composition and having a thickness of from 0.020 inches to 0.560 inches, 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;
(c) an intermediate core layer disposed between the inner core layer and the outer core layer, the intermediate layer being formed from a low modulus HNP composition and having a thickness of from 0.020 inches to 0.280 inches, 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
(d) 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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Abstract
The present invention is directed to golf balls having a layer formed from a low modulus HNP composition and a layer formed from a high modulus HNP composition. Golf balls of the present invention have at least three layers, including an inner core layer, an outer core layer, a cover, and optionally an intermediate core layer. The present invention is not limited by which golf ball layers are formed from an HNP composition, so long as at least one layer is formed from a low modulus HNP composition and at least one layer is formed from a high modulus HNP composition. Low modulus HNP compositions of the present invention comprise a highly neutralized acid copolymer having a modulus of from 1,000 psi to 50,000 psi. High modulus HNP compositions of the present invention comprise a highly neutralized acid copolymer having a modulus of from 25,000 psi to 150,000 psi.
45 Citations
16 Claims
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1. A golf ball comprising:
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(a) an inner core layer formed from a diene rubber composition and having a diameter of from 0.500 inches to 1.580 inches; (b) an outer core layer formed from a high modulus HNP composition and having a thickness of from 0.020 inches to 0.560 inches, 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; (c) an intermediate core layer disposed between the inner core layer and the outer core layer, the intermediate layer being formed from a low modulus HNP composition and having a thickness of from 0.020 inches to 0.280 inches, 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 (d) 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A golf ball comprising:
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(a) an inner core layer formed from a diene rubber composition and having a diameter of from 0.500 inches to 1.580 inches; (b) an outer core layer formed from a low modulus HNP composition and having a thickness of from 0.020 inches to 0.560 inches, 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; (c) an intermediate core layer disposed between the inner core layer and the outer core layer, the intermediate layer being formed from a high modulus HNP composition and having a thickness of from 0.020 inches to 0.280 inches, 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 (d) 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification