Claims
- 1. A method to improve the yellowness index, melt stability, or yellowness index and melt stability of a thermoplastic resin, said method comprising:
- admixing an amine oxide with the thermoplastic resin, said amine oxide having the structural formula: ##STR6## wherein R.sub.1, R.sub.2, and R.sub.3 are independently selected from alkyl, aryl, aralkyl, alkaryl, cycloalkyl, alkcycloalkyl and cycloalkalkyl and each have from 1 to 36 carbon atoms per group, provided that if one of R.sub.1, R.sub.2 and R.sub.3 is an alkyl group having from 6 to 36 carbon atoms per group, then the other two of R.sub.1, R.sub.2 and R.sub.3 cannot both be alkyl groups having from 1 to 5 carbon atoms per group;
- wherein the thermoplastic resin is at least one resin selected from the group consisting of polyesters, polyurethanes, polyalkylene terephthalates, polysulfones, polyimides, polyphenylene ethers, styrenic polymers, polycarbonates, acrylic polymers, polyamides, polyacetals, polyvinyl chloride, and polyolefin homopolymers and copolymers.
- 2. The method of claim 1, wherein said hydrocarbon amine oxide is a trialkyl amine oxide.
- 3. The method of claim 1, wherein said amine oxide is tri(C.sub.12 -C.sub.14) amine oxide.
- 4. The method of claim 1, wherein said amine oxide is a di(C.sub.12 -C.sub.14 alkyl) methyl amine oxide.
- 5. The method of claim 1, wherein said amine oxide is tri(C.sub.16 -C.sub.18) amine oxide.
- 6. The method of claim 1, wherein said amine oxide is a di(C.sub.16 -C.sub.18 alkyl) methyl amine oxide.
- 7. The method of claim 1, wherein said amine oxide is a tri(C.sub.20 -C.sub.22) amine oxide.
- 8. The method of claim 1, wherein said amine oxide is a di(C.sub.20 -C.sub.22 alkyl) methyl amine oxide.
- 9. The method of claim 1, wherein an amount of amine oxide effective to stabilize the thermoplastic resin is admixed with the thermoplastic resin.
- 10. The method of claim 1, wherein R.sub.1, R.sub.2 and R.sub.3 are each independently alkyl groups having from 1 to 22 carbon atoms per group.
- 11. The method of claim 1, wherein R.sub.1 is (CH.sub.3)-- and R.sub.2 and R.sub.3 are each (C.sub.10 H.sub.21)--.
- 12. The method of claim 1, wherein R.sub.1, R.sub.2 and R.sub.3 are each (C.sub.12 H.sub.25)--.
- 13. The method of claim 1, wherein R.sub.1, R.sub.2 and R.sub.3 are each (C.sub.16 H.sub.33)--.
- 14. The method of claim 1, said method further comprising admixing with the thermoplastic resin a stabilizer or mixture of stabilizers selected from phenolic antioxidants, hindered amine light stabilizers, ultraviolet light absorbers, organic phosphorus compounds, alkaline metal salts of fatty acids, and thiosynergists.
- 15. The method of claim 1, wherein the amount of amine oxide is less than about 1000 ppm based upon the weight of the thermoplastic resin.
- 16. The method of claim 1, wherein the thermoplastic resin is a polyolefin resin.
- 17. The method of claim 16, wherein the polyolefin resin is a polypropylene or a polyethylene resin.
- 18. The method of claim 1, wherein at least one of R.sub.1, R.sub.2, and R.sub.3 comprises at least one moiety of the group consisting of --O--, --S--, --SO--, --CO.sub.2 --, --CO--, and --CON--.
- 19. The method of claim 1, wherein the amine oxide comprises a poly(amine oxide).
- 20. The method of claim 19, wherein the poly(amine oxide) comprises at least two tertiary amine oxides per molecule.
- 21. The method of claim 19, wherein the poly(amine oxide) comprises at least one moiety of the group consisting of --O--, --S--, --SO--, --CO.sub.2 --, --CO--, and --CON--.
- 22. The method of claim 20, wherein each tertiary amine oxide of the poly(amine oxide) contains a C.sub.1 residue.
- 23. The method of claim 1, wherein the method comprises extrusion of the amine oxide with the thermoplastic resin.
Parent Case Info
This application is a continuation-in-part of Ser. No. 08/533,134 filed Sep. 25, 1995 now abandoned.
US Referenced Citations (35)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0 470 048 A2 |
Feb 1992 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
533134 |
Sep 1995 |
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