Claims
- 1. A multilayer structure for a package comprising
- (a) a oxygen barrier layer or layers having an oxygen transmission rate less than or equal to 500 cc/(m.sup.2 .multidot.atm.multidot.day) at 25.degree. C., and
- (b) an oxygen scavenging layer or layers comprising an oxygen scavenging system consisting essentially of an ethylenically unsaturated hydrocarbon and a transition metal catalyst having a rate of oxygen scavenging in the presence or absence of (a) which is at least 5 cc oxygen per square meter per day at 25.degree. C., and
- wherein the multilayer structure is flexible, has a thickness of about 5 to 400 microns, and has an oxygen transmission of less than 0.5 cc O.sub.2 /(m.sup.2 .multidot.day.multidot.atm).
- 2. The structure of claim 1 further comprising a layer or layers having an oxygen transmission rate of greater than 500 cc O.sub.2 /(m.sup.2 .multidot.atm.multidot.day) at 25.degree. C.
- 3. The structure of claim 1 further comprising a second oxygen barrier layer or layers having an oxygen transmission rate less than or equal to 500 cc O.sub.2 /(m.sup.2 .multidot.atm.multidot.day) at 25.degree. C.
- 4. The structure of claim 3, wherein the oxygen scavenger layer or layers (b) is located between the first and second oxygen barrier layers.
- 5. The structure of either claim 2, 3 or 4 further comprising one or more heat sealable layers.
- 6. The structure of either claim 2, 3 or 4 further comprising one or more abuse layers.
- 7. The structure of claim 2, 3, or 4, further comprising one or more adhesive layers.
- 8. The structure of claim 2, 3, or 4, further comprising a self-weldable layer.
- 9. The structure of claim 1, wherein the transmission ratio of a non-scavenged gas to oxygen is at least 10.
- 10. The structure of claim 9, wherein the non-scavenged gas is carbon dioxide.
- 11. The structure of claim 5 further comprising one or more abuse layers.
- 12. The structure of claim 5 further comprising one or more adhesive layers.
- 13. The structure of claim 6 further comprising one or more adhesive layers.
- 14. The structure of claim 5 further comprising a self-weldable layer.
- 15. The structure of claim 6 further comprising a self-weldable layer.
- 16. The structure of claim 7 further comprising a self-weldable layer.
- 17. The multilayer structure of claim 1, wherein the oxygen scavenging system includes a photoinitiator.
Parent Case Info
This application is a continuation-in-part of our copending application U.S. Ser. No. 733,901 filed Jun. 22, 1991 U.S. Pat. No. 5,298,849 for "Compositions, Articles and Methods for Scavenging Oxygen", which is a continuation-in-part of our copending application U.S. Ser. No. 679,419 filed Apr. 2, 1991 (abandoned) for "Compositions, Articles and Methods for Scavenging Oxygen", incorporated herein by reference in their entirety.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5021515 |
Cochran et al. |
Jun 1991 |
|
5049624 |
Adams et al. |
Sep 1991 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2247431A |
Mar 1992 |
GBX |
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
733901 |
Jun 1991 |
|
Parent |
679419 |
Apr 1991 |
|