Multi-layer cover golf ball having thermoset rubber intermediate cover layer

A golf ball comprising a core and a three-layer cover, the cover comprising:

• a thermoplastic inner cover layer disposed about the core and having a material hardness of about 60 Shore D to about 80 Shore D;
• a thermoset outer cover layer comprising a castable polyurea and having a material hardness of about 20 Shore D to about 60 Shore D;
• and
• a thermoset intermediate cover layer disposed between the inner and outer cover layers and having a hardness substantially the same as the inner cover layer hardness and greater than the outer cover layer hardness;
• wherein the inner cover layer comprises a high-acid ionomer and the intermediate cover layer is formed from a castable liquid polybutadiene rubber.

A golf ball comprising a core and a three-layer cover, the cover comprising:

• a thermoplastic inner cover layer disposed about the core and having a material hardness of about 60 Shore D to about 80 Shore D;
• a thermoplastic polyurethane outer cover layer having a material hardness of about 20 Shore D to about 60 Shore D;
• and
• a thermoset intermediate cover layer disposed between the inner and outer cover layers and having a hardness substantially the same as the inner cover layer hardness and greater than the outer cover layer hardness;
• wherein the inner cover layer comprises one or more low-acid ionomers and the intermediate cover layer is formed from a ethylene propylene diene monomer-based liquid rubber polymer.