GOLF BALLS HAVING MULTI-LAYERED COVERS BASED ON CASTABLE THERMOPLASTIC POLYURETHANES

摘要

Golf balls having multi-layered covers are provided. Preferably, the ball includes an inner cover layer made of an aromatic polyurethane composition; and an outer cover layer made of an aliphatic polyurethane composition. At least one of the cover layers is formed by casting an aromatic or aliphatic thermoplastic polyurethane composition. Ethylene acid copolymer ionomers can be used to make a second inner cover layer. The cover layers are disposed about a single or multi-layered core. The invention also includes casting methods for making such multi-layered covers. The resulting ball has good light-stability, cut/shear-resistance, and impact durability.

主权项

1. A golf ball, comprising:
a core having at least one layer, and a multi-layered cover having at least two layers, the multi-layered cover comprising:
i) an outer cover layer comprising a first polyurethane composition, the composition comprising aliphatic polyurethane, and the aliphatic polyurethane being present in an amount of at least 60 weight percent; andiii) an inner cover layer disposed between the core and outer cover layer, the inner cover layer comprising a second polyurethane composition, the composition comprising aromatic polyurethane, and the aromatic polyurethane being present in an amount of at least 60 weight percent, at least one of the cover layers being formed by casting an aliphatic or aromatic thermoplastic polyurethane.