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US 2011/0237353 A1Published application
Multi-layer core golf ball
AssigneeAcushnet Company
InventorsMichael J. Sullivan, Derek A. Ladd, Brian Comeau, Douglas S. Goguen
Life of this patent
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Abstract
Golf balls comprising a multi-layer core and a cover are disclosed. The multi-layer core comprises a thermoset rubber inner core, a thermoset rubber first intermediate core layer, a thermoplastic second intermediate core layer, and a thermoset rubber outer core layer. The inner core is preferably formed from a softer rubber than the first intermediate core layer.
Claims16
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, a center hardness of from 40 Shore C to 90 Shore C, and a surface hardness of from 50 Shore C to 95 Shore C;
- a first intermediate core layer formed from a second thermoset rubber composition and having an outer diameter of from 1.200 inches to 1.620 inches and a surface hardness of from 80 Shore C to 95 Shore C;
- a second intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of greater than 50 Shore D;
- an outer core layer formed from a third 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;
- wherein the surface hardness of the first intermediate core layer is greater than the surface hardness of the inner core layer;
- and
- wherein the inner core layer has 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.
6 more elements
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, a center hardness of from 40 Shore C to 90 Shore C, and a surface hardness of from 50 Shore C to 95 Shore C;
- a first intermediate core layer formed from a second thermoset rubber composition and having an outer diameter of from 1.200 inches to 1.620 inches and a surface hardness of from 80 Shore C to 95 Shore C;
- a second intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.005 inches to 0.100 inches and a surface hardness of 60 Shore D or less;
- an outer core layer formed from a third 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;
- wherein the surface hardness of the first intermediate core layer is greater than the surface hardness of the inner core layer;
- and
- wherein the inner core layer has 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.
6 more elements
Dependencies are inferred from the claim text.