Methods for making polyurea polymer and golf balls prepared therefrom

摘要

Methods for making golf balls having a cover made from a polyurea composition are provided. The golf balls include a rubber core and intermediate layer made from an olefin-based ionomer composition. The methods for making the polyurea composition involve preparing an amine-terminated first polymer by reacting isocyanate compound A with a stoichiometric excess of polyamine. The first prepolymer is reacted with a stoichiometric excess of isocyanate compound B to form an isocyanate-terminated second prepolymer. The second prepolymer is then reacted with a chain extender.

主权项

1. A method of forming a golf ball comprising a core formed from a rubber material, an intermediate layer formed from an olefin-based ionomer, and cover formed from a polyurea composition, the intermediate layer being disposed between the core and cover, and the polyurea composition being prepared by a reaction comprising the steps of:
i) forming an amine-terminated first prepolymer by reacting isocyanate compound A with a stoichiometric excess of polyamine compound; ii) forming an isocyanate-terminated second prepolymer by reacting the first prepolymer with a stoichiometric excess of isocyanate compound B; and iii) reacting the second prepolymer with an amine-terminated chain extender, wherein isocyanate compound A is 4,4′-diisocyanatodicyclohexylmethane diisocyanate (H12MDI) and isocyanate compound B is 1,6-hexamethylene diisocyanate (HDI) oligomer.