Multi-layer golf ball
Multi-piece golf balls having a multi-layered solid core and multi-layered cover are provided.
1. A golf ball consisting essentially of:
an inner core layer formed from a thermoset rubber composition and having a center hardness (H center ) of 60 Shore C or greater, and an outer surface hardness (H center surface ) of 80 Shore C or greater;
an intermediate core layer formed from a thermoplastic composition having a material hardness (H intermediate core material ) of 83 Shore C or greater;
an outer core layer formed from a highly neutralized polymer composition having a material hardness (H outer core material ) of 35 Shore D or greater;
an inner cover layer formed from a thermoplastic composition having a material hardness (H inner cover material ) of 95 Shore C or less; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof;
wherein a core structure consisting of the inner core layer, the intermediate core layer, and the outer core layer has a diameter of from 1.40 inches to 1.55 inches.
2. The golf ball of claim 1 , wherein H intermediate core material is greater than H outer core material .
3. The golf ball of claim 1 , wherein the inner core layer has a diameter of 0.50 inches or greater.
4. The golf ball of claim 1 , wherein the outer cover layer composition is thermoplastic.
5. The golf ball of claim 1 , wherein the outer cover layer composition is thermoset.
6. A golf ball consisting essentially of:
an inner core layer formed from a thermoset rubber composition and having a center hardness (H center ) of from 50 Shore C to 75 Shore C, and an outer surface hardness (H center surface ) of from 60 Shore C to 85 Shore C;
an intermediate core layer formed from a thermoplastic composition having a material hardness (H intermediate core material ) of 83 Shore C or greater;
an outer core layer formed from a highly neutralized polymer composition and having an outer surface hardness (H outer core surface ) of from 70 Shore C to 95 Shore C;
an inner cover layer formed from a thermoplastic composition having a material hardness (H inner cover material ) of from 80 Shore C to 95 Shore C; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof.
7. The golf ball of claim 6 , wherein H intermediate core material is greater than H outer core material .
8. The golf ball of claim 6 , wherein the inner core layer has a diameter of 0.50 inches or greater.
9. The golf ball of claim 6 , wherein the outer cover layer composition is thermoplastic.
10. The golf ball of claim 6 , wherein the outer cover layer composition is thermoset.