Castable polyurea formulation for golf ball covers
View Patent ↗Golf balls having improved cut and shear resistance that include covers and/or other layers formed from polyurea compositions formed with at least one amine-terminated polytetramethylene ether glycol homopolymer, at least one amine-terminated copolymer of polytetramethylene ether glycol and polyalkylene glycol. The amine-terminated polytetramethylene ether glycol homopolymer or amine-terminated copolymer of polytetramethylene ether glycol and polyalkylene glycol may be used as the isocyanate-reactive in the prepolymer and/or the curing agent.
1. A golf ball including a core and a cover, wherein the cover includes a composition including:
a prepolymer including the reaction product of an isocyanate-containing component and an amine-terminated component, wherein the amine-terminated component includes a copolymer of polytetramethylene ether glycol homopolymer and polypropylene glycol, wherein the copolymer comprises terminal amino groups, wherein the polypropylene glycol comprises three terminal hydroxy groups; and
an amine-terminated curing agent comprising a copolymer of polytetramethylene ether glycol and polypropylene glycol.
2. The golf ball of claim 1 , wherein the at least one terminal amino group includes secondary amines.
3. The golf ball of claim 1 , wherein the terminal amino groups comprise secondary amines.
4. The golf ball of claim 1 , wherein the prepolymer includes about 4 percent to about 9 percent NCO groups by weight of the prepolymer.
5. The golf ball of claim 1 , wherein the amine-terminated curing agent includes a secondary diamine.
6. The golf ball of claim 1 , wherein the golf ball further includes a layer disposed between the core and the cover.
7. The golf ball of claim 6 , wherein the layer includes a thermoplastic material.
8. A golf ball including a core and a cover, wherein the cover is cast from a composition including:
a prepolymer formed from the reaction product of an isocyanate-containing compound and an isocyanate-reactive compound, wherein the isocyanate-reactive compound includes a copolymer of polytetramethylene ether glycol homopolymer and polypropylene glycol,wherein the polypropylene glycol comprises three hydroxy groups, wherein the polytetramethylene ether glycol homopolymer has a molecular weight of about 1800 to about 2200, and wherein the copolymer comprises terminal secondary amino groups; and
an amine-terminated curing agent comprising polytetramethylene ether glycol homopolymer.
9. The golf ball of claim 8 , wherein the amine-terminated curing agent includes a secondary diamine.
10. The golf ball of claim 8 , further including a casing layer disposed between the core and the cover including a thermoplastic material.
11. The golf ball of claim 10 , wherein the thermoplastic material includes an ionomer resin.
12. The golf ball of claim 8 , wherein the prepolymer includes about 6 percent to about 8 percent NCO groups by weight of the prepolymer.
13. The golf ball of claim 8 , wherein the amine terminated curing agent has a molecular weight of about 1800 to about 2200 and terminal secondary amino groups.