COMPOSITIONS FOR USE IN GOLF BALLS
Golf balls comprising thermoplastic, thermoset, castable, or millable elastomer compositions are disclosed. These elastomer compositions comprise the reaction product of an isocyanate, a moisture-resistant polyamine, and an amine- or hydroxyl-terminated curing agent, and can be used in any one or more portions of the golf balls, such as the inner core, outer core, intermediate layer, inner cover, and/or outer cover.
1 . A golf ball, comprising:
a core having a first Shore C surface hardness of C 1 in the range of 50 to 90, the core being formed from a rubber composition;
an intermediate layer surrounding the core, the intermediate layer being formed from a olefin-based acid copolymer ionomer composition and having a hardness in the range of 30 to 90 Shore D; and
a cover layer surrounding the intermediate layer having a second Shore C surface hardness of C 2 in the range of 60 to 95, the cover layer being formed from a polyurea composition that is produced by a reaction of: i) an isocyanate compound, ii) a moisture-resistant polyamine having a weight average molecular weight in the range of 500 to 10,000 grams per mole, and iii) an amine-terminated curing agent, and wherein the ratio of C 2 to C 1 is in the range of 0.6 to 1.4, wherein the cover layer has a moisture vapor transmission rate between 3 grams·mm/m 2 ·day to 4 grams·mm/m 2 ·day.
2 . The golf ball of claim 1 , wherein the moisture-resistant polyamine is a dimer diamine.
3 . A golf ball, comprising:
a core having an inner core and outer core layer, the inner core having a first Shore C surface hardness of C 1 in the range of 50 to 90, and the outer core layer having a Shore D surface hardness in the range of about 50 to about 90;
an intermediate layer surrounding the core, the intermediate layer being formed from a olefin-based acid copolymer ionomer composition and having a hardness in the range of 30 to 90 Shore D; and
a cover layer surrounding the intermediate layer having a second Shore C surface hardness of C 2 in the range of 60 to 95, the cover layer being formed from a polyurea composition that is produced by a reaction of: i) an isocyanate compound, ii) a moisture-resistant polyamine having a weight average molecular weight in the range of 500 to 10,000 grams per mole, and iii) an amine-terminated curing agent, and wherein the ratio of C 2 to C 1 is in the range of 0.6 to 1.4, wherein the cover layer has a moisture vapor transmission rate between 3 grams·mm/m 2 ·day to 4 grams·mm/m 2 ·day.
4 . The golf ball of claim 3 , wherein the moisture-resistant polyamine is a dimer diamine.