IP Library › Granted Patent US 7,867,107
Granted Patent B2
US 7,867,107 · App. 12/466,421 · Granted Jan 11, 2011

Multi-layer core golf ball

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Quick Facts
Patent No.
US 7,867,107
App. No.
12/466,421
Granted
Jan 11, 2011
Kind
B2
Abstract

Golf balls consisting of a multi-layer core and a cover are disclosed. The multi-layer core consists of a small, hard center enclosed by a soft intermediate core layer and an outer core layer.

Claims (15)

1. A golf ball comprising:

a core having an overall diameter of from 1.40 inches to 1.60 inches and consisting of:

a center formed from an ionomeric composition and having a diameter of from 0.250 inches to 0.500 inches, a surface hardness of from 80 Shore C to 90 Shore C, and a specific gravity of less than 1.00 g/cc;

an intermediate core layer formed from a rubber composition and having a thickness of from 0.300 inches to 0.500 inches and a surface hardness of less than 70 Shore C; and

an outer core layer formed from a rubber composition and having a thickness of from 0.100 inches to 0.400 inches and a surface hardness of 80 Shore C or greater; and

a cover.

2. The golf ball of claim 1 , wherein the center has a diameter of from 0.250 inches to 0.350 inches.

3. The golf ball of claim 1 , wherein the center has a surface hardness of 85 Shore C or greater.

4. The golf ball of claim 1 , wherein the intermediate core layer has a thickness of from 0.350 inches to 0.450 inches and the outer core layer has a thickness of from 0.150 inches to 0.300 inches.

5. The golf ball of claim 1 , wherein a subassembly consisting of the center and the intermediate core layer has a compression of 55 or less.

6. The golf ball of claim 5 , wherein the core has an overall compression of from 60 to 100.

7. The golf ball of claim 1 , wherein the cover comprises an inner cover layer and an outer cover layer.

8. The golf ball of claim 1 , wherein the cover consists of:

an inner cover layer formed from a partially or fully neutralized polymer composition and having a surface hardness of 65 Shore D or greater and a thickness of from 0.030 inches to 0.040 inches; and

an outer cover layer formed from a polyurethane or polyurea composition and having a material hardness of 50 Shore D or less and a thickness of from 0.025 inches to 0.035 inches.