Oxygen scavenging polymers
View Patent ↗A polymer with a backbone and an unsaturated side chain attached to the backbone. The polymer may optionally be combined with an oxidation catalyst and/or other ingredients.
1. A packaging article, comprising:
a layer of an oxygen-scavenging composition including:
an oxygen-scavenging polymer that includes:
a condensation backbone, and
an unsaturated side chain attached to the backbone, wherein the side chain includes at least one acyclic carbon-carbon double bond that does not involve the first carbon atom of the side chain; and
an oxidation catalyst;
wherein the packaging article is suitable for use in packaging food or beverage products to preserve the freshness of the food or beverage products.
2. The packaging article of claim 1 , wherein the backbone of the polymer comprises a polyester, a polyurethane, a polyepoxide, or a polyamide.
3. The packaging article of claim 1 , wherein the backbone comprises a polyester.
4. The packaging article of claim 1 , wherein the backbone comprises a polyethylene terephthalate.
5. The packaging article of claim 1 , wherein the polymer comprises between 1 and 30 weight percent of the side chains.
6. The packaging article of claim 1 , wherein the polymer comprises between 5 and 24 weight percent of the side chains.
7. The packaging article of claim 1 , wherein the polymer comprises between 10 and 20 weight percent of the side chains.
8. The packaging article of claim 1 , wherein the side chain has a single acyclic carbon-carbon double bond.
9. The packaging article of claim 1 , wherein the oxidation catalyst is present at a concentration of greater than about 10 ppm.
10. The packaging article of claim 1 , wherein the oxidation catalyst is present at a concentration of between 100 ppm and 1,000 ppm by weight.
11. The packaging article of claim 1 , wherein the catalyst is present at a concentration between 300 ppm and 600 ppm by weight.
12. The packaging article of claim 1 , wherein the oxidation catalyst comprises cobalt or an oxide, salt, or complex thereof.
13. The packaging article of claim 12 , wherein the oxidation catalyst comprises cobalt acetate, cobalt neodecanoate, cobalt stearate, or cobalt octoate.
14. The packaging article of claim 1 , wherein the layer further comprises one or more additional polymers.
15. The packaging article of claim 1 , wherein the article is a multi-layer packaging article that includes an additional layer of another composition.
16. The packaging article of claim 15 , wherein the layers are compatible with each other.
17. A packaging article, comprising:
a layer of an oxygen-scavenging composition including:
an oxygen-scavenging polymer that includes:
a condensation backbone, and
an unsaturated side chain attached to the backbone, wherein the side chain includes at least one acyclic carbon-carbon double bond that does not involve the first carbon atom of the side chain; and
an oxidation catalyst;
wherein the article is a single layer article that comprises a bottle, cup, bowl, container, carton, can or bag.
18. The packaging article of claim 17 , wherein the article is a single layer bottle that includes up to about 10% by weight of the oxygen-scavenging polymer and 90% by weight or more of another polymer.
19. The packaging article of claim 1 , wherein the article comprises a bottle, cup, bowl, container, film, wrap, liner, tray, carton, can, or bag.
20. A multilayer packaging article, comprising:
a layer of an oxygen-scavenging composition including:
an oxygen-scavenging polymer that includes:
a condensation backbone, and
an unsaturated side chain attached to the backbone, wherein the side chain includes at least one acyclic carbon-carbon double bond that does not involve the first carbon atom of the side chain; and
an oxidation catalyst; and
a layer of another material.