Thermosetting polyurethane material for a golf ball
AssigneeCallaway Golf Company
InventorPijush K. Dewanjee
Life of this patent
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Abstract
A prepolymer blend for a thermosetting polyurethane material that allows for control of the reaction time is disclosed herein. The prepolymer blend is preferably composed of a polyurethane prepolymer and dimethyl methylphosphonate. The thermosetting polyurethane is preferably utilized as a cover for a golf ball. The cover is preferably formed over a core and boundary layer.
Claims14
A golf ball comprising:
- a core;
- and
- a cover formed over the core, the cover composed of a thermosetting polyurethane material formed from reactants comprising a prepolymer blend comprising a polyurethane prepolymer and dimethyl methylphosphonate, and a curing agent wherein the cover has an aerodynamic surface geometry thereon.
The golf ball according to claim 1 further comprising at least one boundary layer disposed between the core and the cover.
The golf ball according to claim 2 wherein the boundary layer is composed of a blend of ionomers.
A golf ball comprising:
- a core comprising a polybutadiene mixture;
- a boundary layer formed over the core;
- and
- a cover formed over the boundary layer, the cover composed of a thermosetting polyurethane material formed from reactants comprising a prepolymer blend comprising polyurethane prepolymer and dimethyl methylphosphonate, and diethyl 2,4-toluenediamine, wherein the cover has an aerodynamic surface geometry thereon.
A golf ball comprising:
- a core;
- and
- a cover formed over the core, the cover composed of a thermosetting polyurethane material formed from reactants comprising prepolymer blend comprising a polypropylene glycol terminated toluene diisocyanate prepolymer and dimethyl methylphosphonate, and a curative blend comprising 4,4′-methylenebis-(3-chloro,2,6-diethyl)-aniline and diethyl 2,4-toluenediamine, wherein the cover has an aerodynamic surface geometry thereon.
A golf ball comprising:
- a solid core comprising a polybutadiene mixture;
- a boundary layer formed over the core, the boundary layer comprising a blend of ionomer materials;
- and
- a cover formed over the core, the cover composed of a thermosetting polyurethane material formed from reactants comprising prepolymer blend comprising a polypropylene glycol terminated toluene diisocyanate prepolymer and dimethyl methylphosphonate, and a curative blend composed of 4,4′-methylenebis-(3-chloro,2,6-diethyl)-aniline and diethyl 2,4-toluenediamine, wherein the cover has an aerodynamic surface geometry thereon.
A golf ball comprising:
- a core comprising a polybutadiene mixture, the core having a diameter ranging from 1.35 inches to 1.64 inches and having a PGA compression ranging from 50 to 90;
- a boundary layer formed over the core, the boundary layer composed of a blend of ionomer materials, the boundary layer having a thickness ranging from 0.020 inch to 0.075 inch, the blend of ionomer materials having a Shore D hardness ranging from 50 to 75 as measured according to ASTM-D2240;
- and
- a cover formed over the core, the cover composed of a thermosetting polyurethane material formed from reactants comprising a prepolymer blend comprising polypropylene glycol terminated toluene diisocyanate prepolymer and dimethyl methylphosphonate in a range of 1 to 10 parts per hundred parts of the comprising polypropylene glycol terminated toluene diisocyanate prepolymer, and a curative blend comprising 20 to 40 parts 4,4′-methylenebis-(3-chloro,2,6-diethyl)-aniline and 80 to 60 parts diethyl 2,4-toluenediamine, wherein the cover has a Shore D hardness ranging from 30 to 60 as measured according to ASTM-D2240, a thickness ranging from 0.015 inch to 0.040 inch, and an aerodynamic surface geometry thereon.
A method for forming a cover for a golf ball, the method comprising:
- blending a mixture of a polyurethane prepolymer and dimethyl methylphosphonate to create a prepolymer blend;
- mixing the prepolymer blend with a curing agent in a mixing chamber to create pre-polyurethane mixture;
- dispensing the pre-polyurethane mixture into a first hemispherical cavity and a second hemispherical cavity;
- placing a golf ball precursor product into the first hemispherical cavity with the pre-polyurethane mixture therein;
- mating the first hemispherical cavity with the second hemispherical cavity;
- and
- curing the pre-polyurethane mixture to create a polyurethane cover on the golf ball precursor product.
The method according to claim 11 wherein the curative blend further comprises diethyl 2,4-toluenediamine.
The method according to claim 13 wherein the curative blend further comprises 4,4′-methylenebis-(3-chloro,2,6-diethyl)-aniline.
Dependencies are inferred from the claim text.