Claims
- 1. In a method for preparing a polyurethane, polyurethane-urea or polyurea polymer wherein an isocyanate-reactive polyether is reacted with a polyisocyanate under conditions sufficient to form said polyurethane, polyurethane-urea or polyurea polymer, the improvement wherein said isocyanate-reactive polyether contains a 6-chromanol derivative in an amount effective to inhibit the oxidation of said polyether.
- 2. The improved method of claim 1, wherein said 6-chromanol derivative is tocol, .alpha.-tocopherol or .delta.-tocopherol.
- 3. The improved method of claim 2, wherein said isocyanate-reactive polyether further contains an effective amount of an additional antioxidant.
- 4. The improved method of claim 3, wherein said polyurethane, polyurethane-urea or polyurea polymer is a slabstock flexible foam, and said reaction of the polyisocyanate with the isocyanate-reactive polyether is conducted in the presence of water.
- 5. The improved method of claim 4, wherein said additional antioxidant comprises a liquid hindered phenol, a liquid diaryl amine, or mixture thereof.
- 6. The improved method of claim 5 wherein said additional antioxidant further comprises an organophosphite.
- 7. The improved method of claim 5 wherein said isocyanate-reactive polyether contains about 50 to about 200 parts per million .alpha.-tocopherol, based on weight of isocyanate-reactive polyether, about 0.5-5 parts by weight of a liquid hindered phenol per part by weight .alpha.-tocopherol, and about 0.5-3 parts by weight of a liquid diaryl amine per part by weight .alpha.-tocopherol.
- 8. The improved method of claim 7 wherein said isocyanate-reactive polyether further comprises about 0.5 to about 3 parts by weight or an organophoshite, per part by weight .alpha.-tocopherol.
- 9. A polyether polyurethane, polyether polyurethane-urea or polyether polyurea containing a 6-chromanol derivative in an amount effective to inhibit the oxidation of said polyether polyurethane, polyether polyurethane-urea or polyether polyurea.
- 10. The polyether polyurethane, polyether polyurethane-urea or polyether polyurea of claim 9 wherein said 6-chromanol derivative is tocol, .alpha.-tocopherol, or .delta.-tocopherol.
Parent Case Info
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 07/791,826 filed Nov. 3, 1991.
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Continuations (1)
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Number |
Date |
Country |
Parent |
791826 |
Nov 1991 |
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