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US 8,075,423 B2Granted
Multi-layer core golf ball
AssigneeAcushnet Company
InventorsMichael J. Sullivan, Derek A. Ladd, Brian Comeau, Douglas S. Goguen
Life of this patent
Estimating the term…
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, a layer formed from an additional thermoplastic composition, and an outermost layer formed from a thermoset rubber.
Claims10
A golf ball comprising:
- an inner core layer formed from a first thermoset rubber composition and having a diameter of from 0.500 inches to 1.580 inches and a positive hardness gradient wherein the difference between the center hardness and the surface hardness of the inner core layer is from 10 to 45 Shore C units;
- a first intermediate core layer formed from a highly neutralized polymer composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of from 50 Shore C to 85 Shore C;
- a second intermediate core layer formed from a thermoplastic composition selected from the group consisting of partially- and fully-neutralized ionomers optionally blended with a maleic anhydride-grafted non-ionomeric polymer, polyesters, polyethers, polyamides, and blends of two or more thereof, and having a thickness of from 0.005 inches to 0.100 inches;
- an outer core layer formed from a second thermoset rubber composition and having a thickness of from 0.010 inches to 0.100 inches and a surface hardness of 50 Shore C or greater;
- and
- a cover layer having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 65 Shore D or less.
3 more elements
A golf ball consisting essentially of:
- an inner core layer formed from a first diene rubber composition and having a diameter of from 0.500 inches to 1.580 inches and a positive hardness gradient wherein the difference between the center hardness and the surface hardness of the inner core layer is from 10 to 45 Shore C units;
- a first intermediate core layer formed from a highly neutralized polymer composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of from 50 Shore C to 85 Shore C;
- a second intermediate core layer formed from a thermoplastic composition selected from the group consisting of partially- and fully-neutralized ionomers optionally blended with a maleic anhydride-grafted non-ionomeric polymer, polyesters, polyethers, polyamides, and blends of two or more thereof, and having a thickness of from 0.005 inches to 0.100 inches;
- an outer core layer formed from a second diene rubber composition and having a thickness of 0.010 inches to 0.100 inches and a surface hardness of 80 Shore C or greater;
- and
- a cover layer formed from a polyurethane, a polyurea, or a copolymer or blend thereof, and having a thickness of from 0.010 inches to 0.050 inches and a surface hardness of 65 Shore D or less.
3 more elements
Dependencies are inferred from the claim text.