Polyurea and polyurethane compositions for golf equipment
View Patent ↗Golf equipment having improved cut and shear resistance that includes a polyurea composition, preferably saturated and/or water resistant, formed of a polyurea prepolymer and a curing agent, wherein the polyurea prepolymer includes an isocyanate and an amine-terminated compound, and wherein the curing agent includes a hydroxy-terminated curing agent, amine-terminated curing agent, or a mixture thereof.
1. A golf ball comprising a core and a cover, wherein the cover is formed from a prepolymer and an amine-terminated curing agent, wherein the prepolymer consists essentially of:
an isocyanate; and
an amine-terminated compound selected from the group consisting of:
and mixtures thereof, wherein x, y, and z are about 1 or greater, wherein R comprises alkyl groups having about 1 to about 20 carbon atoms, phenyl groups, cyclic groups, or mixtures thereof, wherein R 1 and R 2 comprise alkylene groups having about 1 to about 20 carbon atoms, phenylene groups, cyclic groups, or mixtures thereof, and wherein R 3 comprises a hydrogen, a methyl group, or a mixture thereof.
2. The golf ball of claim 1 , wherein the amine-terminated curing agent is selected from the group consisting of ethylene diamine; hexamethylene diamine; 1-methyl-2,6-cyclohexyl diamine; 2,2,4- and 2,4,4-trimethyl-1,6-hexanediamine; 4,4′-bis-(sec-butylamino)-dicyclohexylmethane; N,N′-diisopropyl-isophorone diamine; 1,4-bis-(sec-butylamino)-cyclohexane; 1,2-bis-(sec-butylamino)-cyclohexane; derivatives of 4,4′-bis-(sec-butylamino)-dicyclohexylmethane; 4,4′-dicyclohexylmethane diamine; 1,4-cyclohexane-bis-(methylamine); 1,3-cyclohexane-bis-(methylamine); diethylene glycol bis-(aminopropyl)ether; 2-methylpentamethylene-diamine; diaminocyclohexane; diethylene triamine; triethylene tetramine; tetraethylene pentamine; propylene diamine; 1,3-diaminopropane; dimethylamino propylamine; diethylamino propylamine; imido-bis-(propylamine); monoethanolamine, diethanolamine; triethanolamine; monoisopropanolamine, diisopropanolamine; isophoronediamine; polyoxypropylene diamine; propylene oxide-based triamine; 3,3′-dimethyl-4,4′-diaminocyclohexylmethane; and mixtures thereof.
3. The golf ball of claim 1 , wherein the amine-terminated curing agent is a secondary diamine curing agent.
4. The golf ball of claim 1 , wherein the cover has a difference in yellowness index of about 12 or less after 5 days of ultraviolet light exposure.
5. The golf ball of claim 1 , wherein the cover has a difference in b chroma dimension of about 6 or less after 5 days of ultraviolet light exposure.
6. The golf ball of claim 1 , wherein the composition further comprises at least one density-adjusting filler.
7. The golf ball of claim 1 , wherein the cover has a thickness of about 0.02 inches to about 0.035 inches.
8. The golf ball of claim 1 , further comprising a layer disposed about the core to form an inner ball, wherein the layer has a first Shore D hardness and the cover has a second Shore D hardness, and wherein the ratio of second Shore D hardness to the first Shore D hardness is about 0.7 or less.
9. The golf ball of claim 1 , wherein the core has a diameter of about 1.55 or greater.
10. The golf ball of claim 8 , wherein the layer comprises at least one thermoplastic or thermoset non-ionomeric material.
11. The golf ball of claim 8 , wherein the inner ball further comprises a moisture barrier layer.
12. The golf ball of claim 8 , wherein the inner ball is surface treated.
13. The golf ball of claim 8 , wherein the intermediate layer comprises an ionomeric material.
14. A golf ball comprising a core and a cover, wherein the cover is formed from a polyurea composition comprising a prepolymer and an amine-terminated curing agent, wherein the prepolymer consists essentially of:
an isocyanate; and
an amine-terminated compound selected from the group consisting of:
and mixtures thereof, wherein x, y, and z are about 1 or greater, wherein R comprises alkyl groups having about 1 to about 20 carbon atoms, phenyl groups, cyclic groups, or mixtures thereof, wherein R 1 and R 2 comprise alkylene groups having about 1 to about 20 carbon atoms, phenylene groups, cyclic groups, or mixtures thereof, and wherein R 3 comprises a hydrogen, a methyl group, or a mixture thereof.
15. The golf ball of claim 14 , wherein the cover has a hardness of about 30 Shore D to about 60 Shore D.
16. The golf ball of claim 14 , wherein the golf ball comprises at least one layer disposed between the core and the cover.
17. The golf ball of claim 14 , wherein the at least one layer comprises a thermoplastic material.
18. The golf ball of claim 17 , wherein the at least one layer is surface treated.