Multi-layer golf ball
View Patent ↗Golf balls consisting of a dual core and a dual cover are disclosed. The dual core consists of an inner core layer formed from a rubber composition and an outer core layer formed from a highly neutralized polymer composition. The Shore C hardness of the outer core layer's outer surface is greater than the material hardness of the inner cover layer, and is preferably 75 Shore C or greater.
1. A golf ball consisting of:
an inner core layer formed from a rubber composition and having a diameter of from 1.200 inches to 1.300 inches, a center hardness (H center ) of 50 Shore C or greater, and an outer surface hardness of 65 Shore C or greater;
an outer core layer formed from a highly neutralized polymer composition and having an outer surface hardness (H outer core ) of 75 Shore C or greater;
an inner cover layer formed from a thermoplastic composition and having a material hardness (H inner cover ) less than the outer surface hardness of the outer core layer; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof.
2. The golf ball of claim 1 , wherein H outer core −H center ≧20 Shore C units.
3. The golf ball of claim 1 , wherein H outer core −H center ≧30 Shore C units.
4. The golf ball of claim 1 , wherein H center is from 55 Shore C to 70 Shore C.
5. The golf ball of claim 1 , wherein the outer surface hardness of the inner core layer is from 65 Shore C to 90 Shore C.
6. The golf ball of claim 1 , wherein the outer surface hardness of the inner core layer is from 70 Shore C to 85 Shore C.
7. The golf ball of claim 1 , wherein H outer core is 90 Shore C or greater.
8. The golf ball of claim 1 , wherein H outer core is greater than 80 Shore C, and wherein H inner cover is from 80 Shore C to 95 Shore C.
9. The golf ball of claim 1 , wherein H outer core is 85 Shore C or greater, and wherein H inner cover is from 84 Shore C to 92 Shore C.
10. 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 75 Shore C to 90 Shore C, and H outer core is greater than 85 Shore C.
11. The golf ball of claim 10 , wherein H inner cover is from 80 Shore C to 95 Shore C.
12. The golf ball of claim 10 , wherein H outer core is greater than 87 Shore C, and wherein H inner cover is from 87 Shore C to 91 Shore C.
13. The golf ball of claim 12 , wherein H outer core is 90 Shore C or greater.
14. The golf ball of claim 1 , wherein the inner core layer has a compression of 40 or less.
15. The golf ball of claim 14 , wherein the core has an overall dual core compression of from 75 to 95.
16. The golf ball of claim 1 , wherein the core has an overall dual core diameter of from 1.520 inches to 1.590 inches.
17. A golf ball comprising:
a core consisting of:
an inner core layer formed from a rubber composition and having a diameter of from 1.200 inches to 1.300 inches, a center hardness (H center ) of from 50 Shore C to 70 Shore C, and an outer surface hardness of from 60 Shore C to 85 Shore C; and
an outer core layer formed from a highly neutralized polymer composition and having an outer surface hardness (H outer core ) of from 80 Shore C to 95 Shore C; and
a cover consisting of:
an inner cover layer formed from a thermoplastic composition and having a material hardness (H inner cover ) less than the outer surface hardness of the outer core layer; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof.
18. The golf ball of claim 17 , wherein H outer core −H center ≧20 Shore C units.
19. The golf ball of claim 17 , wherein H outer core −H center ≧25 Shore C units.
20. The golf ball of claim 17 , wherein H outer core is 85 Shore C or greater, and wherein H inner cover is from 84 Shore C to 92 Shore C.