THERMOPLASTIC MULTI-LAYER GOLF BALL
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United States of America Patent
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Issued Date -
Dec 4, 2014
app pub date -
May 31, 2013
filing date -
May 31, 2013
priority date (Note) -
Abandoned
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Abstract
A thermoplastic multi-layer golf ball has a thermoplastic core center, a thermoplastic core layer, and an inner cover layer and outer cover layer each including a thermoplastic polyurethane. The core center has a diameter of about 5-20 mm and a first flexural modulus of ≦about 8,000 psi. The core layer has a diameter of about 28-40 mm, a thickness of about 4-10 mm, a second flexural modulus of ≦about 15,000 psi and greater than the first flexural modulus, a 10-130 kg compression deformation of about 2.6-4.0 mm, and a surface hardness greater than the core center's surface hardness. The outer cover layer has a 10-130 kg compression deformation of about 2.3-3.2 mm and a surface hardness that is less than that of the inner cover layer. The difference between the core center's specific gravity and the core layer's specific gravity is ≦about 0.1 g/cm3.
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