Compositions for golf equipment
View Patent ↗A golf ball comprising a core, an inner cover layer, and an outer cover layer, the outer cover layer being formed from a polyurea including a caprolactone-free prepolymer of an aliphatic isocyanate mixture comprising dimerized uretdione of HDI and trimerized isocyanurate of HDI (or, optionally, trimerized biuret of HDI) and a first amount of modified polyoxypropylene diamine having a formula: where x=1-70; R 1 and R 2 each independently=a C 1-20 alkyl group, phenyl, or a mixture thereof; and R 3 ═H, CH 3 , or a mixture thereof; and a curative including a mixture of 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine.
1. A golf ball comprising a core, an inner cover layer, and an outer cover layer, the outer cover layer being formed from a polyurea comprising:
a prepolymer consisting essentially of:
an aliphatic isocyanate mixture comprising dimerized uretdione of HDI and trimerized isocyanurate of HDI; and
a first amount of modified polyoxypropylene diamine having a formula:
where x =1-70; R 1 and R 2 each independently =a C 1-20 alkyl group, phenyl, or a mixture thereof; and R 3 ═CH 3 ,; and
a curative comprising a mixture of 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine.
2. The golf ball of claim 1 , wherein the aliphatic isocyanate mixture further comprises trimerized biuret of HDI.
3. The golf ball of claim 1 , wherein the isocyanate mixture has 6% free isocyanate to 9.5% free isocyanate.
4. The golf ball of claim 1 , wherein the core comprises a solid center and an outer core layer.
5. The golf ball of claim 4 , wherein the center has an outer diameter of 0.095 inches to 1.1 inches.
6. The golf ball of claim 1 , wherein the core has an Atti compression of 75 or less.
7. The golf ball of claim 1 , wherein the outer cover layer has a material hardness of 70 Shore C to 80 Shore C and a hardness, as measured on the golf ball, of 40 Shore D to 55 Shore D.
8. The golf ball of claim 1 , wherein the outer cover layer has a first hardness and the inner cover layer has a second hardness, and a ratio of the first to second hardness is 0.8 to 0.7.
9. The golf ball of claim 1 , wherein the outer cover layer has a thickness of 0.025 inches to 0.04 inches.
10. The golf ball of claim 1 , wherein the inner cover layer has a thickness of 0.01 inches to 0.045 inches.
11. The golf ball of claim 1 , wherein the inner cover layer has a thickness of 0.025 inches to 0.035 inches.
12. The golf ball of claim 1 , wherein the core has an outer diameter of 1.5 inches to 1.6 inches.
13. A golf ball consisting of a core and an outer cover layer, the outer cover layer being formed from a polyurea comprising:
a prepolymer consisting essentially of:
an aliphatic isocyanate mixture comprising dimerized uretdione of HDI and trimerized isocyanurate of HDI; and
a polyoxypropylene diamine having secondary amine groups; and
a curative comprising a mixture of 3,5-diethyl-2,4-toluenediamine and 3,5-diethyl-2,6-toluenediamine.
14. The golf ball of claim 13 , wherein the aliphatic isocyanate mixture further comprises trimerized biuret of HDI.
15. The golf ball of claim 13 , wherein the modified polyoxypropylene diamine does not contain an —OH group.
16. The golf ball of claim 13 , wherein the core comprises a solid center and an outer core layer.
17. The golf ball of claim 16 , wherein the golf ball further comprises an inner cover layer disposed between the outer core layer and the outer cover layer, the inner cover layer having a thickness of 0.02 inches to 0.04 inches.
18. The golf ball of claim 17 , wherein the golf ball has an Atti compression of 95 to 120.
19. The golf ball of claim 13 , wherein the golf ball further comprises an inner cover layer disposed between the core and the outer cover layer, the inner cover layer and outer cover layer each having a thickness of 0.01 inches to 0.045 inches.