Golf balls having a low modulus HNP layer and a high modulus HNP layer
First Claim
1. A golf ball consisting of:
- (a) a center having a diameter of from 1.20 inches to 1.30 inches, a center hardness of 50 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;
(b) an outer core layer having a surface hardness of 75 Shore C or greater and 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;
(c) an inner cover layer formed from a thermoplastic composition and having a material hardness less than the surface hardness of the outer core layer; and
(d) an outer cover layer formed from a polyurethane or polyurea composition;
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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Accused Products
Abstract
The present invention is directed to golf balls consisting of a dual-layer core and a cover. The core consists of a center having a center hardness of 50 Shore C or greater and formed from a low modulus HNP composition, and an outer core layer having a surface hardness of 75 Shore C or greater and formed from a high modulus HNP composition. Low modulus HNP compositions of the present invention have a modulus of from 1,000 psi to 50,000 psi. High modulus HNP compositions of the present invention have a modulus of from 25,000 psi to 150,000 psi. The modulus of the highly neutralized copolymer of the low modulus HNP is at least 10% less than the modulus of the highly neutralized copolymer of the high modulus HNP composition. The cover consists of an inner cover layer formed from a thermoplastic composition and an outer cover layer formed from a polyurethane or polyurea composition.
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Citations
18 Claims
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1. A golf ball consisting of:
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(a) a center having a diameter of from 1.20 inches to 1.30 inches, a center hardness of 50 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; (b) an outer core layer having a surface hardness of 75 Shore C or greater and 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; (c) an inner cover layer formed from a thermoplastic composition and having a material hardness less than the surface hardness of the outer core layer; and (d) an outer cover layer formed from a polyurethane or polyurea composition; 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 consisting of:
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(a) a center having a diameter of from 0.75 inches to 1.19 inches, a center hardness of 50 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; (b) an outer core layer having a surface hardness of 75 Shore C or greater and 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; (c) an inner cover layer formed from a thermoplastic composition and having a material hardness less than the surface hardness of the outer core layer; and (d) an outer cover layer formed from a polyurethane or polyurea composition; 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, 17, 18)
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Specification