Patent ID: 8318845

Claim:
A golf ball comprising a core and a cover of at least one layer formed over the core, wherein the ball has a ball weight change ratio, in a 72-hour accelerated moisture absorption test conducted at a temperature of 40° C. and a relative humidity of 90%, of less than 0.287%, and wherein the cover layer includes the lamellar filler selected from the group consisting of mica, talc and glass, and the thickness of the lamellar filler is within a range of from 1 to 10 μm and the particle size of the lamellar filler is within a range of from 5 to 1000 μm, and wherein the outermost layer of the cover is formed of a resin composition selected from among [I], [II] and [III] [I] a resin composition containing polyurethane which includes as soft segments an ester polyol, wherein the resin composition comprises a thermoplastic polyurethane and an isocyanate mixture obtained by dispersing an isocyanate compound having at least two isocyanate groups as functional groups per molecule in a thermoplastic resin that is substantially non-reactive with isocyanate; [II] a resin composition containing polyurethane which includes as soft segments an ester polyol, wherein the resin composition comprises a resin blend that consisting of a plurality of the same kind of pellets which are composed primarily of a thermoplastic polyurethane and a polyisocyanate compound, in at least some portion of which polyisocyanate compound all the isocyanate groups on the molecule remain in an unreacted state; and [III] a resin composition containing polyurea which includes as soft segments an ester-based amine-terminated component; and wherein two-part curing urethane paints are applied to the surface of the outermost layer of the cover.