Claims
- 1. A method for preparing a polyurea polymer formulation comprising:
admixing a polyisocyanate, an isocyanate-reactive material, and a fatty-acid ester to form a mixture, said fatty-acid ester being present in an amount effective for providing blister resistance to a molded polyurea polymer prepared from said mixture such that when said molded polyurea polymer is exposed to moisture and a temperature of at least 350° F. (177° C.), said molded polyurea polymer is substantially free of blisters.
- 2. The method of claim 1, wherein said isocyanate-reactive material is at least one of a polyamine and a polyol.
- 3. The method of claim 1, wherein a polyepoxide is admixed with said mixture.
- 4. The method of claim 1, wherein said mixture has an isocyanate index of between 1.05 and 1.40.
- 5. The method of claim 1, wherein said mixture has an isocyanate index of 1.20.
- 6. The method of claim 3, wherein said mixture has an isocyanate index of 1.05.
- 7. The method of claim 1 , wherein the fatty-acid ester is jojoba oil.
- 8. The method of claim 1, wherein said fatty-acid ester is present in an amount of at least 0.5 weight percent based on the weight of said mixture excluding the weight of said polyisocyanate.
- 9. The method of claim 1, wherein said fatty-acid ester is present in an amount of at least 1.5 weight percent based on the weight of said mixture excluding the weight of said polyisocyanate.
- 10. The method of claim 1, wherein said molded polyurea polymer is exposed to a temperature of at least 375° F. (190° C.).
- 11. The method of claim 1, wherein said molded polyurea polymer is exposed to a temperature of at least 390° F. (199° C.).
- 12. The method of claim 1, wherein said molded polyurea polymer is exposed to a temperature of at least 400° F. (204° C.).
- 13. The method of claim 1, wherein when said molded polyurea polymer is exposed to moisture, said molded polyurea polymer takes up no more than 2 weight-percent water based on the weight of said molded polyurea polymer.
- 14. The method of claim 1, wherein said molded polyurea polymer is exposed to said temperature for at least 20 minutes and no longer than 60 minutes.
- 15. The method of claim 1, wherein said molded polyurea polymer is molded by reaction injection molding.
- 16. The method of claim 1, wherein said molded polyurea polymer is suitable for use in an e-coat process.
- 17. A method of improving a molded polyurea polymer's blister resistance, said method comprising:
(A) adding an effective amount of a fatty-acid ester to a polyurea-polymer formulation comprising a polyisocyanate and an isocyanate-reactive material to prepare a mixture; and (B) molding said mixture to prepare a molded polyurea polymer, wherein said molded mixture develops substantially fewer blisters, as compared to a molded mixture that is substantially free of a fatty-acid ester, when exposed to moisture and a temperature of at least 350° F. (177° C.), said molded polyurea polymer being exposed to said temperature for at least 20 minutes and no longer than 60 minutes.
- 18. The method of claim 17, wherein said mixture has an isocyanate index between 1.05 and 1.40.
- 19. The method of claim 17, wherein said mixture further comprises a polyepoxide.
- 20. The method of claim 17, wherein said fatty-acid ester is jojoba oil.
- 21. The method of claim 17, wherein said isocyanate-reactive material is at least one of a polyamine and a polyol.
- 22. The method of claim 17, wherein said fatty-acid ester is present in an amount of at least 0.5 weight percent based on the weight of said mixture excluding the weight of said polyisocyanate.
- 23. The method of claim 17, wherein said molded polyurea polymer is exposed to a temperature of at least 375° F. (190° C.).
- 24. The method of claim 17, wherein when said molded polyurea polymer is exposed to moisture, said molded polyurea polymer takes up no more than 2 weight-percent water based on the weight of said molded polyurea polymer.
- 25. The method of claim 17, wherein said mixture is molded by reaction injection molding.
- 26. A polyurea-polymer formulation prepared by a method comprising:
admixing a polyisocyanate, an isocyanate-reactive material, and a fatty-acid ester to form a mixture, said fatty-acid ester being present in an amount effective for providing blister resistance to a molded polyurea polymer prepared from said mixture such that when said molded polyurea polymer is exposed to moisture and a temperature of at least 350° F. (177° C.), said molded polyurea polymer is substantially free of blisters.
- 27. A molded polyurea polymer prepared by a method comprising:
(A) admixing a polyisocyanate, an isocyanate-reactive material, and a fatty-acid ester to form a mixture; and (B) molding said mixture using reaction injection molding to form a molded polyurea polymer, wherein said mixture contains said fatty-acid ester in an amount effective for providing blister resistance to said molded polyurea polymer such that when said molded polyurea polymer is exposed to moisture and a temperature of at least 350° F. (177° C.), said molded polyurea polymer is substantially free of blisters.
- 28. A polyurea-polymer formulation suitable for preparing a molded polyurea polymer, said formulation comprising: a polyisocyanate, an isocyanate-reactive material, and a fatty-acid ester, said fatty-acid ester being present in an amount effective for providing blister resistance to a molded polyurea polymer prepared from said formulation such that when said molded polyurea polymer is exposed to moisture and a temperature of at least 350° F. (177° C), said molded polyurea polymer is substantially free of blisters.
- 29. The formulation of claim 28, wherein said isocyanate-reactive material is at least one of a polyamine and a polyol.
- 30. The formulation of claim 28, wherein said fatty-acid ester is jojoba oil.
- 31. The formulation of claim 28 further comprising at least one additive, said additive being at least one of a chain extender, a catalyst, a surfactant, and an internal-mold-release agent.
- 32. The formulation of claim 28 further comprising a polyepoxide.
CROSS-REFERENCE STATEMENT
[0001] This application claims the benefit of U.S. Provisional application Ser. No. 60/170,294, filed Dec. 10, 1999, which is hereby incorporated by reference.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60170294 |
Dec 1999 |
US |