Claims
- 1. A polyurethane film comprising a film prepared from an aqueous polyurethane dispersion, the dispersion being prepared from a nonionic polyurethane prepolymer and water, wherein the nonionic polyurethane prepolymer is prepared from a polyisocyanate and a low monol polyether polyol.
- 2. The polyurethane film according to claim 1 wherein the dispersion is prepared in the presence of a surfactant and in the substantial absence of an organic solvent.
- 3. The polyurethane film according to claim 1 wherein the low monol polyether polyol has a molecular weight of at least 3000 Daltons.
- 4. The polyurethane film according to claim 1 wherein the low monol polyether polyol has a measured unsaturation of less than about 0.025 meq/g.
- 5. The polyurethane film according to claim 1 wherein the polyisocyanate is an aromatic polyisocyanate selected from the group consisting of MDI, TDI and mixtures thereof.
- 6. The polyurethane film according to claim 1 wherein the nonionic polyurethane prepolymer has an average practical functionality of less than about 2.1.
- 7. The polyurethane film according to claim 1 wherein the nonionic polyurethane prepolymer has an isocyanate content of from about 1 to about 9 weight percent.
- 8. A glove prepared from the film of claim 1.
- 9. A process for preparing an aqueous polyurethane dispersion comprising
preparing a nonionic polyurethane prepolymer from a polyisocyanate and a low monol polyol; and admixing the nonionic polyurethane prepolymer with water.
- 10. The process according to claim 9 wherein the dispersion is prepared in the presence of a surfactant and in the substantial absence of an organic solvent.
- 11. The process according to claim 9 wherein the low monol polyether polyol has a molecular weight of at least 3000 Daltons.
- 12. The process according to claim 9 wherein the low monol polyether polyol has a measured unsaturation of less than about 0.025 meq/g.
- 13. The process according to claim 9 wherein the polyisocyanate is an aromatic polyisocyanate selected from the group consisting of MDI, TI)I and mixtures thereof.
- 14. An aqueous polyurethane dispersion prepared according to the process of claim 9.
- 15. The aqueous polyurethane dispersion according to claim 14, wherein the dispersion has a particle size of from 0.9 microns to 0.05 microns.
- 16. The aqueous polyurethane dispersion according to claim 14, wherein the dispersion has a solids content of from 5 to 60 weight percent.
CROSS-REFERENCE TO PRIOR APPLICATION
[0001] This application claims the benefit of U.S. Provisional Application No. 60/204,874 filed May 16, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60204874 |
May 2000 |
US |