Multi-layer core golf ball
First Claim
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1. A golf ball comprising:
- a center formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.580 inches, a center hardness of from 40 Shore C to 75 Shore C, a surface hardness of from 50 Shore C to 95 Shore C, and a positive hardness gradient wherein the difference between the center hardness and the surface hardness of the center is from 10 to 45 Shore C;
an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of greater than 50 Shore D;
an outer core layer formed from a second thermoset rubber composition and having a thickness of 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 60 Shore D or less;
wherein the specific gravity of at least one of the center, intermediate core layer, and outer core layer is less than 1.05 g/cc.
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Abstract
Golf balls consisting of a multi-layer core and a cover are disclosed. The multi-layer core comprises a thermoset rubber center, a thermoplastic intermediate core layer, and a thermoset rubber outer core layer.
53 Citations
16 Claims
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1. A golf ball comprising:
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a center formed from a first thermoset rubber composition and having a diameter of from 1.250 inches to 1.580 inches, a center hardness of from 40 Shore C to 75 Shore C, a surface hardness of from 50 Shore C to 95 Shore C, and a positive hardness gradient wherein the difference between the center hardness and the surface hardness of the center is from 10 to 45 Shore C; an intermediate core layer formed from a thermoplastic composition and having a thickness of 0.005 inches to 0.100 inches and a surface hardness of greater than 50 Shore D; an outer core layer formed from a second thermoset rubber composition and having a thickness of 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 60 Shore D or less; wherein the specific gravity of at least one of the center, intermediate core layer, and outer core layer is less than 1.05 g/cc. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification