Multi-layer golf ball
View Patent ↗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 thermoplastic composition and having a diameter of 1.2 inches or greater, 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;
an intermediate cover layer formed from a thermoplastic composition having a material hardness (H intermediate cover material ) of 80 Shore C or greater;
and an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof;
wherein H intermediate cover material is greater than H outer core material .
2. The golf ball of claim 1 , wherein the intermediate core layer has a thickness of from 0.015 inches to 0.070 inches.
3. The golf ball of claim 1 , wherein H intermediate core material is 87 Shore C or greater.
4. The golf ball of claim 1 , wherein the intermediate core layer has a surface hardness (H intermediate core surface ) and the outer core layer has a surface hardness (H outer core surface ), and H intermediate core surface is greater than H outer core surface .
5. The golf ball of claim 1 , wherein the intermediate core layer has a surface hardness of 87 Shore C or greater and the outer core layer has a surface hardness of 85 Shore C or greater.
6. A golf ball consisting essentially of:
an inner core layer formed from a thermoplastic composition and having a diameter of 1.2 inches or greater, 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, the intermediate core layer having a thickness of from 0.015 inches to 0.070 inches;
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;
an intermediate cover layer formed from a thermoplastic composition having a material hardness (H intermediate cover material ) of 80 Shore C or greater, the intermediate cover layer having a thickness of from 0.020 inches to 0.150 inches; and
an outer cover layer formed from a composition selected from the group consisting of polyurethanes, polyureas, and copolymers and blends thereof;
wherein the inner core layer, the intermediate core layer, and the outer core layer form a multi-layer core having a diameter of from 1.40 inches to 1.55 inches; and
wherein H intermediate cover material is greater than H outer core material .
7. The golf ball of claim 6 , wherein H intermediate core material is 87 Shore C or greater.
8. The golf ball of claim 6 , wherein the intermediate core layer has a surface hardness (H intermediate core surface ) and the outer core layer has a surface hardness (H outer core surface ), and H intermediate core surface is greater than H outer core surface .
9. The golf ball of claim 6 , wherein the intermediate core layer has a surface hardness of 87 Shore C or greater and the outer core layer has a surface hardness of 85 Shore C or greater.