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US 10,300,343 B2Granted
Golf balls having at least two core layers formed from HNP compositions
AssigneeAcushnet Company
InventorsMichael J. Sullivan, David A. Bulpett, Robert Blink, Mark L. Binette, Brian Comeau
Life of this patent
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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.
Claims9
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.
10 more elements
Dependencies are inferred from the claim text.