Multi-layer-core golf ball having highly-neutralized polymer outer core layer
AssigneeAcushnet Company
InventorsMurali Rajagopalan, Michael J. Sullivan
Life of this patent
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Abstract
A golf ball including an inner core layer formed from a thermoset rubber composition and having a first surface hardness; a thermoplastic outer core layer having a second surface hardness, an inner surface hardness, and being formed from a copolymer of ethylene and an α,β-unsaturated carboxylic acid, an organic acid or salt thereof, and sufficient cation source to fully-neutralize the acid groups of the copolymer; an inner cover layer; and an outer cover layer; wherein the first surface hardness is less than the second surface hardness by at least 5 Shore C and less than the inner surface hardness by at least 5 Shore C.
Claims11
A golf ball comprising:
- an inner core layer comprising a thermoset rubber composition and having a first surface hardness;
- a thermoplastic outer core layer having a second surface hardness, an inner surface hardness, and comprising a copolymer of ethylene and an α,β-unsaturated carboxylic acid, an organic acid or salt thereof, and sufficient cation source to fully-neutralize the acid groups of the copolymer;
- an inner cover layer;
- and
- an outer cover layer;
- wherein the first surface hardness is less than the second surface hardness by at least 5 Shore C and less than the inner surface hardness by at least 5 Shore C.
Dependencies are inferred from the claim text.