Multi-layer golf ball
View Patent ↗Golf balls consisting of a dual core and a dual cover are disclosed. The Shore C hardness of the outer core layer's outer surface is greater than that of the inner cover layer's outer surface, and the Shore C hardness of the outer core layer's outer surface is at least 20 Shore C units greater than that of the center.
1. A golf ball consisting essentially of:
an inner core layer formed from a first rubber composition and having a diameter of from 0.75 inches to 1.05 inches, a center Shore C hardness (H center ) of 50 or greater, and an outer surface Shore C hardness of 80 or greater;
an outer core layer formed from a second rubber composition and having an outer surface Shore C hardness (H outer core ) of 85 or greater;
an inner cover layer formed from a thermoplastic composition and having an outer surface Shore C hardness (H inner cover ) of 95 or less;
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof; and
a moisture vapor barrier layer disposed between the outer core layer and the inner cover layer;
wherein H outer core >H inner cover ; and
wherein H outer core −H center ≧20 Shore C units.
2. The golf ball of claim 1 , wherein the diameter of the inner core layer is from 0.95 inches to 1.05 inches.
3. The golf ball of claim 1 , wherein H center is from 60 Shore C to 70 Shore C.
4. The golf ball of claim 1 , wherein the outer surface hardness of the inner core layer is from 80 Shore C to 90 Shore C.
5. The golf ball of claim 1 , wherein H outer core is 90 Shore C or greater.
6. The golf ball of claim 1 , wherein H outer core −H center ≧25 Shore C units.
7. The golf ball of claim 1 , wherein H inner cover is from 80 Shore C to 95 Shore C.
8. The golf ball of claim 1 , wherein H inner cover is from 87 Shore C to 91 Shore C.
9. The golf ball of claim 1 , wherein H center is from 60 Shore C to 70 Shore C, the outer surface hardness of the inner core layer is from 80 Shore C to 90 Shore C, and H outer core is 90 Shore C or greater.
10. The golf ball of claim 1 , wherein H outer core is 90 Shore C or greater and H inner cover is from 80 Shore C to 95 Shore C.
11. The golf ball of claim 1 , wherein H outer core is greater than 90 Shore C and H inner cover is from 87 Shore C to 91 Shore C.
12. The golf ball of claim 1 , wherein the core has an overall dual core compression of from 80 to 100.
13. The golf ball of claim 1 , wherein the core has an overall dual core compression of from 85 to 95.
14. The golf ball of claim 1 , wherein the core has an overall dual core diameter of from 1.520 inches to 1.590 inches.
15. A golf ball comprising:
a core having a diameter of from 1.525 inches to 1.555 inches, a compression of from 85 to 95, and consisting of:
an inner core layer formed from a first rubber composition and having a diameter of from 0.900 inches to 1.100 inches, a center Shore C hardness (H center ) of 60 or greater, and an outer surface Shore C hardness of 80 or greater; and
an outer core layer formed from a second rubber composition and having an outer surface Shore C hardness (H outer core ) of from 85 to 95;
a cover consisting of:
an inner cover layer formed from a thermoplastic composition and having an outer surface Shore C hardness (H inner cover ) of 95 or less; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof; and
a moisture vapor barrier layer disposed between the core and the cover;
wherein H outer core >H inner cover ; and
wherein H outer core −H center ≧20 Shore C units.
16. The golf ball of claim 15 , wherein H outer core −H center ≧25 Shore C units.