Multilayer core golf ball having hardness gradient within and between each core layer

A golf ball comprising:

• a two layer core and a cover disposed about the two layer core,
• the two layer core comprising an inner core layer and an outer core layer disposed about the inner core layer,
• said inner core layer comprising a geometric center and a first outer surface and being formed from a substantially homogenous formulation and having a diameter of about 30 mm or less and having a plurality of hardnesses of from about 50 Shore C to about 80 Shore C,
• the geometric center comprising a first hardness and the first outer surface comprising a second hardness wherein the first hardness is greater than the second hardness to define a negative hardness gradient of about 20 Shore C or less,
• said outer core layer comprising an inner surface and a second outer surface and being formed from a substantially homogenous formulation and comprising a thickness of about 10 mm or less and having a plurality of hardnesses of from about 50 Shore C to about 80 Shore C,
• the inner surface comprising a third hardness and the second outer surface comprising a fourth hardness, wherein the fourth hardness similar to the third hardness,
• the outer core layer further comprising a fifth hardness disposed between the inner surface and the second outer surface in a region extending between about 10% and about 90% of the distance from the inner surface to the second outer surface, wherein the fifth hardness is greater than the third hardness and the fourth hardness and similar to the first hardness, and
• wherein the fourth hardness is less than the first hardness to define a two layer core having a negative hardness gradient of less than about 10 Shore C.

A golf ball comprising:

• a two layer core and a cover disposed about the two layer core,
• the two layer core comprising an inner core layer and an outer core layer disposed about the inner core layer,
• said inner core layer comprising a geometric center and a first outer surface and being formed from a substantially homogenous formulation and having a diameter of about 30 mm or less and having a plurality of hardnesses of from about 25 Shore D to about 55 Shore D,
• the geometric center comprising a first hardness and the first outer surface comprising a second hardness wherein the first hardness is greater than the second hardness to define a negative hardness gradient of about 20 Shore D or less;
• said outer core layer comprising an inner surface and a second outer surface and being formed from a substantially homogenous formulation and comprising a thickness of about 10 mm or less and having a plurality of hardnesses of from about 30 Shore D to about 69 Shore D,
• the inner surface comprising a third hardness and the second outer surface comprising a fourth hardness, wherein the fourth hardness is greater than the third hardness,
• the outer core layer further comprising a fifth hardness disposed between the inner surface and the second outer surface in a region extending between about 10% and about 90% of the distance from the inner surface to the second outer surface, wherein the fifth hardness is greater than the third hardness and the fourth hardness, and
• wherein the fourth hardness is greater than the first hardness to define a two layer core having a positive hardness gradient of less than about 45 Shore D.

A golf ball comprising:

• a two layer core and a cover disposed about the two layer core,
• the two layer core comprising an inner core layer and an outer core layer disposed about the inner core layer,
• said inner core layer comprising a geometric center and a first outer surface and being formed from a substantially homogenous formulation and having a diameter of about 30 mm or less and having a plurality of hardnesses of from about 25 Shore D to about 55 Shore D,
• the geometric center comprising a first hardness and the first outer surface comprising a second hardness wherein the first hardness is greater than the second hardness to define a negative hardness gradient of about 20 Shore D or less;
• said outer core layer comprising an inner surface and a second outer surface and being formed from a substantially homogenous formulation and comprising a thickness of about 10 mm or less and having a plurality of hardnesses of from about 30 Shore D to about 52 Shore D,
• the inner surface comprising a third hardness and the second outer surface comprising a fourth hardness, wherein the fourth hardness is greater than the third hardness,
• the outer core layer further comprising a fifth hardness disposed between the inner surface and the second outer surface in a region extending between about 10% and about 90% of the distance from the inner surface to the second outer surface, wherein the fifth hardness is greater than the third hardness and the fourth hardness, and
• wherein the fourth hardness is less than the first hardness to define a two layer core having a negative hardness gradient of no greater than about 10 Shore D.