Multi-layer core golf ball
First Claim
Patent Images
1. A golf ball comprising:
- an inner core layer having a diameter of from 0.500 inches to 1.580 inches and formed from a highly neutralized polymer composition, wherein the highly neutralized polymer composition comprises;
an acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid;
a non-acid polymer selected from the group consisting of polyolefins, polyamides, polyesters, polyethers, polyurethanes, metallocene-catalyzed polymers, single-site catalyst polymerized polymers, ethylene propylene rubber, ethylene propylene diene rubber, styrenic block copolymer rubbers, alkyl acrylate rubbers, and functionalized derivatives thereof;
an organic acid or salt thereof; and
a cation source present in an amount sufficient to neutralize greater than 80% of all acid groups present in the composition;
wherein the acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid does not include a softening monomer, and wherein the acid is selected from acrylic acid and methacrylic acid and is present in the acid copolymer in an amount of from 15 mol % to 30 mol %, based on the total weight of the acid copolymer;
and wherein the non-acid polymer is an alkyl acrylate rubber selected from ethylene-alkyl acrylates and ethylene-alkyl methacrylates and is present in an amount of greater than 50 wt %, based on the combined weight of the acid copolymer and the non-acid polymer;
an outer core layer formed from a thermoset rubber composition and having a thickness of from 0.010 inches to 0.300 inches and a surface hardness of 50 Shore C or greater; and
a cover.
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Abstract
Golf balls comprising a multi-layer core and a cover are disclosed. The multi-layer core comprises a layer formed from a highly neutralized polymer composition and a layer formed from a thermoset rubber.
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Citations
6 Claims
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1. A golf ball comprising:
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an inner core layer having a diameter of from 0.500 inches to 1.580 inches and formed from a highly neutralized polymer composition, wherein the highly neutralized polymer composition comprises; an acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid;a non-acid polymer selected from the group consisting of polyolefins, polyamides, polyesters, polyethers, polyurethanes, metallocene-catalyzed polymers, single-site catalyst polymerized polymers, ethylene propylene rubber, ethylene propylene diene rubber, styrenic block copolymer rubbers, alkyl acrylate rubbers, and functionalized derivatives thereof; an organic acid or salt thereof; and a cation source present in an amount sufficient to neutralize greater than 80% of all acid groups present in the composition; wherein the acid copolymer of ethylene and an α
,β
-unsaturated carboxylic acid does not include a softening monomer, and wherein the acid is selected from acrylic acid and methacrylic acid and is present in the acid copolymer in an amount of from 15 mol % to 30 mol %, based on the total weight of the acid copolymer;and wherein the non-acid polymer is an alkyl acrylate rubber selected from ethylene-alkyl acrylates and ethylene-alkyl methacrylates and is present in an amount of greater than 50 wt %, based on the combined weight of the acid copolymer and the non-acid polymer; an outer core layer formed from a thermoset rubber composition and having a thickness of from 0.010 inches to 0.300 inches and a surface hardness of 50 Shore C or greater; and a cover. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification