Multi-layer golf ball
First Claim
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1. A golf ball consisting essentially of:
- (a) a center having a diameter of from 0.50 inches to 1.30 inches, a center hardness of 50 Shore C or greater, and formed from a center composition comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer wherein at least 80% of the acid groups of the acid copolymer are neutralized;
(b) an outer core layer having a surface hardness of 75 Shore C or greater and formed from an outer core layer composition comprising a highly neutralized ethylene/(meth)acrylic acid copolymer wherein 40% to 100% of the acid groups present in the outer core layer composition are neutralized;
(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 center composition is at least 10% less than the modulus of the highly neutralized copolymer of the outer core layer composition.
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Abstract
The present invention is directed to multi-layer golf balls including a layer formed from a composition comprising a relatively soft or low modulus HNP, a layer formed from a composition comprising a relatively hard or high modulus HNP, 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
8 Claims
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1. A golf ball consisting essentially of:
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(a) a center having a diameter of from 0.50 inches to 1.30 inches, a center hardness of 50 Shore C or greater, and formed from a center composition comprising a highly neutralized ethylene/(meth)acrylic acid/alkyl (meth)acrylate copolymer wherein at least 80% of the acid groups of the acid copolymer are neutralized; (b) an outer core layer having a surface hardness of 75 Shore C or greater and formed from an outer core layer composition comprising a highly neutralized ethylene/(meth)acrylic acid copolymer wherein 40% to 100% of the acid groups present in the outer core layer composition are neutralized; (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 center composition is at least 10% less than the modulus of the highly neutralized copolymer of the outer core layer composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification