Oxygen scavenging monolayer bottles
View Patent ↗Monolayer packages comprised of an oxygen scavenging composition suitable for direct contact with package contents and recycle with other polyester bottles are disclosed. The oxygen scavenging composition is comprised of a modified copolymer which is comprised of predominantly polyester segments and an oxygen scavenging amount of oxygen scavenging segments. The polyester segments comprise segments derived from typical bottling and packaging polyesters such as PET and PEN. Use of these oxygen scavenging copolymers in bottles provides a clear and rigid monolayer bottle similar in appearance to unmodified polyester bottles. In a series of preferred embodiments, bottles fabricated with the oxygen scavenging copolymers of this invention are over 99 wt % PET and contain less than 50 ppb of extractable components.
1. A monolayer polyester package for oxygen sensitive products comprised of an oxygen scavenging composition wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst, and wherein the monolayer package is appropriate for direct contact with the oxygen sensitive products and has a haze value less than about 8%.
2. The monolayer package of claim 1 further comprising a polyester packaging material appropriate for direct contact with the oxygen sensitive products.
3. The monolayer package of claim 2 wherein the polyester packaging material is PET or PEN.
4. The monolayer package of claim 1 wherein the modified copolymer is comprised of predominantly polycondensate segments and a lesser weight percent of oxygen scavenging moiety segments.
5. The monolayer package of claim 4 wherein the modified copolymer contains from about 0.05 wt % to about 20 wt % oxygen scavenging moiety segments.
6. The monolayer package of claim 5 wherein the oxygen scavenging moiety segments are comprised of polyolefin oligomers having a molecular weight in the range of 100 to 10,000.
7. The monolayer package of claim 6 wherein the oxygen scavenging moiety segments are comprised of unhydrogenated polybutadiene having a molecular weight in the range of 1,000 to 3,000.
8. The monolayer package of claim 4 wherein the polycondensate segments are comprised of PET or PET copolymer.
9. The monolayer package of claim 1 wherein the migration level of the components of oxygen scavenging composition from the package to the oxygen sensitive products is less than 50 ppb.
10. The monolayer package of claim 1 further comprising a coating.
11. The monolayer package of claim 1 wherein the monolayer package is suitable for recycle with conventional polyester bottles.
12. A monolayer package for oxygen sensitive products comprised of a polyester packaging material and an oxygen scavenging composition, wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst wherein the migration level of the components of the oxygen scavenging composition front the package to the oxygen sensitive products is less than 50 ppb.
13. The monolayer package of claim 12 wherein the modified copolymer is comprised of about 80-99.95 wt % PET segments and about 0.05 wt % to 20 wt % unhydrogenated polybutadiene segments.
14. The monolayer package of claim 12 further comprising a coating.
15. The monolayer package of claim 12 wherein the monolayer package is suitable for recycle with conventional polyester bottles.
16. The monolayer package of claim 12 wherein the monolayer package has a haze value less than about 8%.
17. The monolayer package of claim 1 or 12 comprising 0.02 to 10 wt % modified copolymer and 90 to 99.8 wt % unmodified polyester.
18. A monolayer package for oxygen sensitive products comprised of a polyester packaging material and an oxygen scavenging composition, wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst, wherein the modified copolymer is comprised of 5 to 10 wt % unhydrogenated polybutadiene segments and 90 to 95 wt % polycondensate segments wherein the migration level of the components of the oxygen scavenging composition from the package to the oxygen sensitive products is less than 50 ppb, and wherein the monolayer package has a haze value less than about 3%.
19. A monolayer package for oxygen sensitive products comprised of an oxygen scavenging composition wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst, and wherein the monolayer package is appropriate for direct contact with a food or beverage.
20. The monolayer package of claim 19 further comprising a plastic packaging material appropriate for direct contact with the oxygen sensitive products.
21. The monolayer package of claim 20 wherein the plastic packaging material is PET or PEN.
22. The monolayer package of claim 19 wherein the modified copolymer is comprised of predominantly polycondensate segments and a lesser weight percent of oxygen scavenging moiety segments.
23. The monolayer package of claim 22 wherein the modified copolymer contains from about 0.05 wt % to about 20 wt % oxygen scavenging moiety segments.
24. The monolayer package of claim 23 wherein the oxygen scavenging moiety segments are comprised of polyolefin oligomers having a molecular weight in the range of 100 to 10,000.
25. The monolayer package of claim 24 wherein the oxygen scavenging moiety segments are comprised of unhydrogenated polybutadiene having a molecular weight in the range of 1,000 to 3,000.
26. The monolayer package of claim 22 wherein the polycondensate segments are comprised of PET or PET copolymer.
27. The monolayer package of claim 19 wherein the migration level of the components of oxygen scavenging composition from the package to the food or beverage is less than 50 ppb.
28. The monolayer package of claim 19 further comprising a coating.
29. The monolayer package of claim 19 wherein the monolayer package is suitable for recycle with conventional polyester bottles.
30. The monolayer package of claim 19 wherein the monolayer package has a haze value less than about 8%.
31. A monolayer package for oxygen sensitive products comprised of a polyester packaging material and an oxygen scavenging composition, wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst wherein the migration level of the components of the oxygen scavenging composition from the package to the food or beverage is less than 50 ppb.
32. The monolayer package of claim 31 wherein the modified copolymer is comprised of about 80-99.95 wt % PET segments and about 0.05 wt % to 20 wt % unhydrogenated polybutadiene segments.
33. The monolayer package of claim 31 further comprising a coating.
34. The monolayer package of claim 31 wherein the monolayer package is suitable for recycle with conventional polyester bottles.
35. The monolayer package of claim 31 wherein the monolayer package has a haze value less than about 8%.
36. The monolayer package of claim 19 or 31 comprising 0.02 to 10 wt % modified copolymer and 90 to 99.8 wt % unmodified polyester.
37. A monolayer package appropriate for direct contact with a food or beverage comprised of a polyester packaging material and an oxygen scavenging composition, wherein the oxygen scavenging composition is comprised of a modified copolymer and a transition metal catalyst, wherein the modified copolymer is comprised of 5 to 10 wt % unhydrogenated polybutadiene segments and 90 to 95 wt % polycondensate segments wherein the migration level of the components of the oxygen scavenging composition from the package to the oxygen sensitive products is less than 50 ppb, and wherein the monolayer package has a haze value less than about 5%.