Importance

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Abstract

The invention provides a method of manufacturing golf balls by drying blending:

one or more type of (i) resin pellets of a first kind obtained by kneading, in a nitrogen atmosphere, a low-humidity atmosphere having a moisture content of not more than 100 ppm or a vacuum atmosphere, a resin blend composed primarily of (A) a thermoplastic polyurethane and (B) a polyisocyanate compound, at least some of the isocyanate groups within the resin pellets remaining in an unreacted state; andone or more type of (ii) resin pellets of a second kind composed primarily of (C) a thermoplastic polyurethane, then feeding the dry blend to an injection-molding operation and forming at least one cover layer.

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First Claim