Multi-layer core golf ball
First Claim
Patent Images
1. 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 80 Shore C or greater;
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 85 Shore C or less;
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 inner core layer is greater than the surface hardness of the first intermediate 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.
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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 harder rubber than the first intermediate core layer.
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Citations
16 Claims
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1. A golf ball comprising:
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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 80 Shore C or greater; 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 85 Shore C or less; 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 inner core layer is greater than the surface hardness of the first intermediate 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A golf ball comprising:
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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 80 Shore C or greater; 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 85 Shore C or less; 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 inner core layer is greater than the surface hardness of the first intermediate 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification