Method for treating thermoplastic polyurethane golf ball covers
A method of forming a golf ball is disclosed herein. The method includes placing a golf ball precursor product with a thermoplastic polyurethane cover in a solution containing an isocyanate functionality reactive material. The precursor product is then removed from the solution and heated to remove solvent. The precursor product is then placed in an isocyanate solution. The precursor product is then removed and heated to remove solvent to prepare the precursor product for finishing.
1. A method of forming a golf ball, the method comprising:
placing a golf ball precursor product in a solution to create a solution covered golf ball precursor product, the golf ball precursor product comprising a cover comprising a thermoplastic polyurethane material, the solution comprising one or more chemical moieties capable of reacting with isocyanate functionalities, wherein the one or more chemical moieties capable of reacting with isocyanate functionalities is selected from the group consisting of polyester-based polyols, diamines, polybutadiene based polyols, polyamines, diacids, polyacids and mixtures thereof;
removing the solution covered golf ball precursor product from the solution;
heating the solution covered golf ball precursor product to remove the solvent to create a pre-treated solution covered golf ball precursor product;
placing the pre-treated solution covered golf ball precursor product in an isocyanate solution to create a isocyanate solution covered golf ball precursor product; and
heating the isocyanate solution covered golf ball precursor product to create a final golf ball precursor product.
2. The method according to claim 1 wherein the one or more chemical moieties capable of reacting with isocyanate functionalities is 1,4 butanediol.
3. The method according to claim 1 wherein the one or more chemical moieties capable of reacting with isocyanate functionalities is a diamine.
4. The method according to claim 1 wherein the solution further comprises a solvent selected from the group consisting of acetone, of methyl ethyl ketone and toluene.
5. The method according to claim 1 wherein the golf ball precursor product is placed in the solution for one to two minutes.
6. The method according to claim 1 wherein the solution covered golf ball precursor product is heated from two to four hours at a temperature ranging from 125° F. to 250° F.
7. The method according to claim 1 wherein the pre-treated solution covered golf ball precursor product is placed in the isocyanate solution for one to two minutes.
8. The method according to claim 1 wherein the isocyanate solution covered golf ball precursor product is heated from two to four hours at a temperature ranging from 125° F. to 250° F.
9. The method according to claim 1 wherein heating the solution covered golf ball precursor product comprises air-drying the solution covered golf ball precursor product at approximately 72° F.
10. The method according to claim 1 wherein the isocyanate solution comprises acetone and MDI.
11. The method according to claim 1 wherein the golf ball precursor product further comprises a core and a boundary layer formed over the core with the thermoplastic polyurethane cover formed over the boundary layer.
12. The method according to claim 1 wherein the final golf ball precursor product is subjected to gamma irradiation for additional cross-linking.