Patent ID: 7550535

Claim:
A golf ball comprising a core and a cover having a plurality of layers that encloses the core, the ball being characterized in that at least a first layer of the cover is formed primarily of a heated mixture of: (A) 60 to 90 wt % of a metal ion neutralization product of an olefin-unsaturated carboxylic acid copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer (40 to 80 wt % of component A being an ionomer neutralized with alkali metal ions), (B) 5 to 20 wt % of at least one type of olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer, and (C) 2 to 30 wt % of a thermoplastic polyurethane elastomer; wherein at least one other cover layer adjoining the at least first cover layer is formed primarily of a non-ionomeric thermoplastic elastomer, and wherein the polyurethane elastomer has added thereto an isocyanate mixture.