Thermoplastic Multi-Layer Golf Ball

A golf ball, comprising:

• a core center having a diameter from about 21 mm to about 29 mm and comprising a first thermoplastic material comprising an ionomer resin and a polyolefin elastomer and having a 10-130 kg compression deformation of at least about 4 mm and a first flexural modulus of up to about 9700 psi;
• a core layer disposed radially outward from the core center, wherein the core layer has a thickness of at least about 5 mm and comprises a second thermoplastic material having a second flexural modulus of up to about 15,000 psi;
• and
• a cover disposed radially outward from the core layer, wherein the cover comprises a third thermoplastic material having a third flexural modulus of up to about 5,000 psi;
• wherein the second flexural modulus is greater than the first flexural modulus, the second flexural modulus is at least about 10,000 psi greater than the third flexural modulus, and the specific gravity of the core layer and the specific gravity of the core center differ by at least about 0.1 g/cm3.