Cationic polyurea cover compositions for a multi-layer golf ball
Golf balls that have at least one layer formed from a cationic polyurea material. In particular, the compositions of the invention, which include a polymer backbone including urea linkages with cationic groups, may be formed from an isocyanate-containing component and an isocyanate-reactive component, at least one of which includes precursor cationic groups, in the presence of an alkylating, quaternizing, or ternarizing agent.
1. A golf ball comprising at least one layer comprising a blend of a high-crystalline acid polymer and a composition comprising:
a polyurea prepolymer formed from the reaction product of a diisocyanate and an amine-terminated component;
wherein the prepolymer comprises a neutralizing agent comprising dialkyl sulfate;
a curative comprising:
an amine-terminated curing agent having at least one of the following general formulas:
H 2 N—R 1 —NH 2 ;
R 2 HN—R 1 —NHR 2 ;
R 3 R 2 N—R 1 —NR 2 R 3 ;
H 2 N—R 1 —NHR 2 ;
R 3 R 2 N—R 1 —NH 2 ; or
R 3 R 2 N—R 1 —NHR 2
where R 1 comprises unsubstituted or substituted straight chain or branched aliphatic groups, unsubstituted or substituted aromatic groups, or mixtures thereof, wherein R 2 and R 3 independently comprise an alkyl group, an aryl group, or an aralkyl group, and wherein the amine-terminated curing agent further comprises about 5 percent to about 25 percent precursor cationic groups by weight of the amine-terminated curing agent; and
wherein between about 20 percent and 70 percent of the precursor cationic groups are neutralized.
2. The golf ball of claim 1 , wherein the curative further comprises a flow modifier.
3. The golf ball of claim 1 , wherein the precursor cationic groups comprise a sulfide.
4. The golf ball of claim 1 , wherein the golf ball comprises a core, an intermediate layer disposed about the core to form an inner ball, and a cover disposed about the inner ball, and wherein the cover is formed from the composition.
5. The golf ball of claim 4 , wherein the intermediate layer is formed from a thermoplastic material.
6. The golf ball of claim 1 , wherein the golf ball comprises a core, an intermediate layer disposed about the core to form an inner ball, and a cover disposed about the inner ball, and wherein the intermediate layer is formed from the composition.
7. A golf ball comprising a core and a cover, wherein the cover comprises a blend of a high-crystalline acid polymer and a composition comprising:
a polyurea prepolymer formed from the reaction product of a diisocyanate and an amine terminated component;
a curative comprising:
an amine-terminated curing agent comprising between about 1 percent to about 50 percent precursor cationic groups by weight of the amine-terminated curing agent; and
wherein the prepolymer comprises a dialkyl sulfate.
8. The golf ball of claim 7 , wherein the cover comprises an inner cover layer and an outer cover layer.
9. The golf ball of claim 8 , wherein the inner cover layer comprises the composition.
10. The golf ball of claim 8 , wherein the outer cover layer comprises the composition.
11. The golf ball of claim 8 , wherein between about 20 percent and 70 percent of the precursor cationic groups are neutralized.
12. The golf ball of claim 8 , wherein the composition further comprises a flow modifier.
13. The golf ball of claim 12 , wherein greater than about 70 percent of the precursor cationic groups are neutralized.
14. The golf ball of claim 8 , wherein the precursor cationic groups comprise ═S.
15. The golf ball of claim 8 , wherein the amine-terminated curing agent comprises between about 5 percent to about 25 percent precursor cationic groups by weight of the amine-terminated curing agent.
16. The golf ball of claim 8 , wherein the composition is thermoplastic.
17. The golf ball of claim 8 , wherein the composition is thermoset.