Golf ball
AssigneeSRI Sports Limited
InventorMasatoshi Yokota
Life of this patent
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Abstract
A golf ball having a cured polyurethane cover which includes an isocyanate group terminated polyurethane prepolymer comprising a specific alicyclic diisocyanate as a polyisocyanate component, and a specific 4,4′-diaminodiphenylmethane derivative as a curing agent.
Claims13
A golf ball having a polyurethane cover, wherein the polyurethane cover is formed by curing a polyurethane cover composition which comprises:
- an isocyanate group terminated polyurethane prepolymer comprising 4,4′-dicyclohexylmethanediisocyanate as a diisocyanate component and a polyoxytetramethyleneglycol as a polyol component, wherein the polyurethane prepolymer contains 0.5% or more of free 4,4′-dicyclohexylmethanediisocyanate, and
- 3,3-diethyl-55′-dimethyl-4,4′-diaminodiphenylmethane.
A two-piece golf ball having a solid core and a polyurethane cover covering the solid core, wherein the polyurethane cover is formed by curing a polyurethane cover composition which comprises:
- an isocyanate group terminated polyurethane prepolymer comprising 4,4′-dicyclohexylmethanediisocyanate as a diisocyanate component, and a polyoxytetramethyleneglycol as a polyol component, wherein the polyurethane prepolymer contains 0.5% or more of free 4,4′-dicyclohexylmethanediisocyanate, and
- 3,3-diethyl-5,5′-dimethyl-4,4′-diaminodiphenylmethane.
A multi-piece golf ball having a solid core including a center and at least one intermediate layer covering the center;
- and
- a polyurethane cover covering the solid core, wherein the polyurethane cover is formed by curing a polyurethane cover composition which comprises:
- an isocyanate group terminated polyurethane prepolymer comprising 4,4′-dicyclohexylmethanediisocyanate as a diisocyanate component, and a polyoxytetramethyleneglycol as a polyol component, wherein the polyurethane prepolymer contains 0.5% or more of free 4,4′-dicyclohexylmethanediisocyanate, and
- 3,3-diethyl-5,5′-dimethyl-4,4′-diaminodiphenylmethane.
Dependencies are inferred from the claim text.