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 prepolymer and an amine curative. The prepolymer is formed from an aliphatic isocyanate and a secondary polyamine polyether 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.
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 comprising:
an aliphatic isocyanate; and
a secondary polyamine polyether 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
an amine curative.
2. The golf ball of claim 1 , wherein the amine curative comprises 3,5-diethyl-2,4-toluenediamine or 3,5-diethyl-2,6-toluenediamine.
3. The golf ball of claim 1 , wherein the aliphatic isocyanate comprises 2% by weight to 15% by weight reactable isocyanate moieties.
4. The golf ball of claim 3 , wherein the aliphatic isocyanate comprises 5% by weight to 11% by weight reactable isocyanate moieties.
5. The golf ball of claim 4 , wherein the aliphatic isocyanate comprises 6% by weight to 9.5% by weight reactable isocyanate moieties.
6. The golf ball of claim 1 , wherein the aliphatic isocyanate comprises 1,6-hexamethylene diisocyanate.
7. The golf ball of claim 1 , wherein the aliphatic isocyanate comprises uretdione of hexamethylene diisocyanate.
8. The golf ball of claim 1 , wherein the aliphatic isocyanate comprises isocyanurate of hexamethylene diisocyanate.
9. The golf ball of claim 1 , wherein the aliphatic isocyanate comprises dimerized uretdione of hexamethylene diisocyanate, trimerized isocyanurate of hexamethylene diisocyanate, and trimerized biuret of hexamethylene diisocyanate.
10. The golf ball of claim 1 , wherein the secondary polyamine polyether does not contain an —OH group.
11. The golf ball of claim 1 , wherein the core comprises a solid center and an outer core layer.
12. The golf ball of claim 11 , wherein the center has an outer diameter of 0.095 inches to 1.1 inches.
13. 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.
14. 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.
15. The golf ball of claim 1 , wherein the outer cover layer has a thickness of 0.025 inches to 0.04 inches.
16. The golf ball of claim 1 , wherein the inner cover layer has a thickness of 0.01 inches to 0.045 inches.
17. The golf ball of claim 1 , wherein the inner cover layer has a thickness of 0.025 inches to 0.035 inches.
18. The golf ball of claim 1 , wherein the core has an outer diameter of 1.5 inches to 1.6 inches.