Golf balls having at least two core layers formed from HNP compositions
First Claim
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1. A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.62 inches and consists of:
- (a) a center having a diameter of from 0.125 inches to 0.750 inches;
(b) an intermediate core layer formed from a first highly neutralized polymer composition; and
(c) an outer core layer formed from a second highly neutralized polymer composition;
wherein the material hardness of the first highly neutralized polymer composition is less than the material hardness of the second highly neutralized polymer composition;
wherein the intermediate core layer has a surface hardness less than the surface hardness of the center and the surface hardness of the outer core layer; and
wherein at least one of the first highly neutralized polymer composition and the second highly neutralized polymer composition comprises;
an acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid;
an alkyl acrylate rubber selected from ethylene-alkyl acrylates and ethylene-alkyl methacrylates;
magnesium oleate present in an amount of 20 parts or greater per 100 parts of acid copolymer and akyl acrylate rubber combined; and
a cation source present in an amount sufficient to neutralize 110% or greater of all acid groups present in the composition.
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Abstract
The present invention is directed to golf balls consisting of a multi-layer core and a cover. The multi-layer core includes at least one layer formed from a relatively soft or low modulus HNP composition and at least one layer formed from a relatively hard or high modulus HNP composition.
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Citations
9 Claims
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1. A golf ball comprising a core and a cover, wherein the core has an overall diameter of from 1.40 inches to 1.62 inches and consists of:
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(a) a center having a diameter of from 0.125 inches to 0.750 inches; (b) an intermediate core layer formed from a first highly neutralized polymer composition; and (c) an outer core layer formed from a second highly neutralized polymer composition; wherein the material hardness of the first highly neutralized polymer composition is less than the material hardness of the second highly neutralized polymer composition; wherein the intermediate core layer has a surface hardness less than the surface hardness of the center and the surface hardness of the outer core layer; and wherein at least one of the first highly neutralized polymer composition and the second highly neutralized polymer composition comprises; an acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid;an alkyl acrylate rubber selected from ethylene-alkyl acrylates and ethylene-alkyl methacrylates; magnesium oleate present in an amount of 20 parts or greater per 100 parts of acid copolymer and akyl acrylate rubber combined; and a cation source present in an amount sufficient to neutralize 110% or greater of all acid groups present in the composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification