Patent ID: 6663507
Filing Date: 2003-12-16
Classification: A63B,C08G,C08L

Abstract:
A multi-piece solid golf ball comprising a core, at least one mantle layer enclosing the core, and a cover; whereinthe cover is made primarily of a thermoplastic polyurethane composition, the cover and the mantle layer have a difference in Shore D hardness therebetween such that âˆ’8&lE;[(cover hardness)âˆ’(mantle layer hardness)]&lE;5, the cover and the core have a difference in Shore D hardness therebetween such that 5&lE;[(cover hardness)âˆ’(average core hardness)]&lE;25, the core has an average Shore D hardness of 30 to 50, the cover has a Shore D hardness of at least 52, and the ball has an initial velocity of at least 76.4 m/s, wherein the thermoplastic polyurethane composition includes (A) a thermoplastic polyurethane and (B) an isocyanate mixture prepared by dispersing (b-1) a compound having as functional groups at least two isocyanate groups per molecule in (b-2) a thermoplastic resin that is substantially non-reactive with isocyanate.