Multi-layer core golf ball
Golf balls comprising a multi-layer core and a cover are disclosed. The multi-layer core comprises at least three layers, including at least one thermoset layer and at least one thermoplastic layer. At least one core layer has a plurality of projections disposed thereon.
1. A golf ball comprising:
an inner core layer formed from a first thermoset composition and having a diameter of from 0.50 inches to 1.30 inches;
an intermediate core layer formed from a thermoplastic composition and comprising a plurality of projections disposed on the outer surface thereof;
an outer core layer formed from a second thermoset composition; and
a cover;
wherein the outer surface hardness of the intermediate core layer is greater than the outer surface hardness of the outer core layer; and
wherein the inner core layer has a center hardness of 80 Shore C or less and an outer surface hardness of 30 Shore C or greater; the outer core layer has an outer surface hardness of 25 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is from 0 to 40.
2. The golf ball of claim 1 , wherein the inner core layer has a center hardness of 80 Shore C or less and an outer surface hardness of 70 Shore C or greater; the outer core layer has an outer surface hardness of 60 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is from 0 to 20.
3. A golf ball comprising:
an inner core layer formed from a first thermoset composition and having a diameter of from 0.50 inches to 1.30 inches;
an intermediate core layer formed from a thermoplastic composition and comprising a plurality of projections disposed on the outer surface thereof;
an outer core layer formed from a second thermoset composition; and
a cover;
wherein the outer surface hardness of the intermediate core layer is greater than the outer surface hardness of the outer core layer; and
wherein the inner core layer has a center hardness of 90 Shore C or less and an outer surface hardness of 75 Shore C or greater; the outer core layer has an outer surface hardness of 80 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is ≤20.
4. A golf ball comprising:
an inner core layer formed from a first thermoset composition and having a diameter of from 0.50 inches to 1.30 inches and comprising plurality of projections disposed on the outer surface thereof;
an intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.01 inches to 0.20 inches;
an outer core layer formed from a second thermoset composition and having a thickness of from 0.10 inches to 0.25 inches; and
a cover;
wherein the outer surface hardness of the intermediate core layer is greater than the outer surface hardness of the outer core layer; and
wherein the inner core layer has a center hardness of 80 Shore C or less and an outer surface hardness of 30 Shore C or greater; the intermediate core layer has an outer surface hardness of 40 Shore C or greater; the outer core layer has an outer surface hardness of 25 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is from 0 to 40.
5. The golf ball of claim 4 , wherein the inner core layer has a center hardness of 80 Shore C or less and an outer surface hardness of 70 Shore C or greater; the intermediate core layer has an outer surface hardness of 75 Shore C or greater; the outer core layer has an outer surface hardness of 60 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is from 0 to 20.
6. A golf ball comprising:
an inner core layer formed from a first thermoset composition and having a diameter of from 0.50 inches to 1.30 inches and comprising plurality of projections disposed on the outer surface thereof;
an intermediate core layer formed from a thermoplastic composition and having a thickness of from 0.01 inches to 0.20 inches;
an outer core layer formed from a second thermoset composition and having a thickness of from 0.10 inches to 0.25 inches; and
a cover;
wherein the outer surface hardness of the intermediate core layer is greater than the outer surface hardness of the outer core layer; and
wherein the inner core layer has a center hardness of 90 Shore C or less and an outer surface hardness of 75 Shore C or greater; the intermediate core layer has an outer surface hardness of 85 Shore C or less; the outer core layer has an outer surface hardness of 80 Shore C or greater; the outer surface hardness of the inner core layer is greater than the center hardness; and the difference between the outer surface Shore C hardness of the outer core layer and the center Shore C hardness is ≤20.