Thermoset polyurethanes based on moisture-resistance polyols for use in golf balls

A golf ball, comprising:

• a core having a first Shore C surface hardness of C1 in the range of 50 to 90;
• an intermediate layer surrounding the core;
• and
• a cover layer surrounding the intermediate layer having a second Shore C surface hardness of C2 in the range of 60 to 95, the cover layer being formed from a thermoset polyurethane or polyurethane-urea composition that is produced by a reaction of i) an isocyanate compound, ii) a moisture-resistant polyol having a weight average molecular weight in the range of 500 to 10,000 grams per mole, and iii) a curing agent selected from hydroxyl-terminated or amine-terminated curing agents, and mixtures thereof, and wherein the ratio of C2 to C1 is in the range of 0.6 to 1.4, wherein the cover layer has a moisture vapor transmission rate between 3 grams·mm/m2·day to 4 grams grams·mm/m2·day.

A golf ball having a multi-layered cover, comprising:

• a core having a first Shore C surface hardness of C1 in the range of 60 to 95;
• an intermediate layer surrounding the core;
• a cover surrounding the intermediate layer having a second Shore C surface hardness of C2 in the range of 50 to 90;
• the cover comprising an inner cover layer and outer cover layer, at least one of the cover layers being formed from a thermoset polyurethane or polyurethane-urea composition that is produced by a reaction of i) an isocyanate compound;
• ii) a moisture-resistant polyol having a weight average molecular weight in the range of 500 to 10,000 grams per mole, and iii) a curing agent selected from hydroxyl-terminated or amine-terminated curing agents, and mixtures thereof, wherein the cover layer has a moisture vapor transmission rate between 3 grams·mm/m2·day to 4 grams·mm/m2·day.