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US 8,262,511 B2Granted
Multi-layer core golf ball
AssigneeAcushnet Company
InventorsMichael J. Sullivan, Brian Comeau, Douglas S. Goguen
Life of this patent
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Abstract
Golf balls consisting of a multi-layer core and a cover are disclosed. The multi-layer core comprises a soft thermoset rubber center, a stiff thermoplastic intermediate core layer, and a thin thermoset rubber outer core layer. The maximum hardness of the core is a point or region located at a distance of from 0.1 mm to 8.0 mm measured radially inward from the outer surface of the core. The maximum core hardness is preferably at least 10% greater than the outer surface hardness of the core.
Claims20
A golf ball comprising:
- a core consisting of:
- a center formed from a first diene rubber composition and having a diameter of from 1.000 inches to 1.580 inches, a center hardness of from 40 Shore C to 70 Shore C, and a surface hardness (SHcenter) of from 50 Shore C to 85 Shore C;
- an intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.005 inches to 0.100 inches and an outer surface hardness of 60 Shore D or greater;
- and
- an outer core layer formed from a second diene rubber composition and having a thickness of from 0.010 inches to 0.100 inches and an outer surface hardness (SHouter) of 80 Shore C or greater;
- wherein SHouter is greater than SHcenter;
- wherein the core has a maximum hardness (SHpeak) located at a distance of from 0.25 mm to 5.00 mm measured radially inward from the outer surface of the core;
- and
- wherein SHpeak is 10% or more higher than SHouter;
- and
- a cover layer having a thickness of from 0.010 inches to 0.050 inches and formed from a composition having a material hardness of less than 60 Shore D.
8 more elements
A golf ball comprising:
- a core consisting of:
- a center formed from a first diene rubber composition and having a diameter of from 1.400 inches to 1.550 inches, a center hardness of from 45 Shore C to 70 Shore C, and a surface hardness (SHcenter) of from 55 Shore C to 85 Shore C;
- an intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.020 inches to 0.070 inches and an outer surface hardness of 65 Shore D or greater;
- and
- an outer core layer formed from a second diene rubber composition and having a thickness of from 0.020 inches to 0.050 inches and an outer surface hardness (SHouter) of 85 Shore C or greater;
- wherein SHouter is greater than SHcenter;
- wherein the core has a maximum hardness (SHpeak) located at a distance of from 0.50 mm to 5.00 mm measured radially inward from the outer surface of the core;
- and
- wherein SHpeak is 10% or more higher than SHouter;
- and
- a cover layer having a thickness of from 0.010 inches to 0.050 inches and formed from a composition having a material hardness of less than 60 Shore D, wherein the cover layer composition is selected from polyurethanes, polyureas, and polyurethane-urea hybrids.
8 more elements
Dependencies are inferred from the claim text.