Multilayered package with barrier properties
View Patent ↗The present invention provides compositions useful as a barrier layer in, for example, packaging products. The compositions generally comprise a blend of (i) a polyester resin, preferably an aromatic polyester resin such as polyethylene terephthalate (PET) and (ii) a polyamide material (e.g., MXD6). The blend optionally may further comprise (iii) an oxygen scavenging material. The present invention also provides containers (e.g., containers formed by expansion of preforms) having a multilayered body-forming portion including: a core layer comprising the aforementioned blend; and inner and outer layers of a formable polymer composition. The present invention also provides methods of making such containers.
1. An article comprising:
a packaging article having a barrier layer, the barrier layer comprising a blend of:
between 10 and 60% by weight of a polyester material,
more than 40% by weight of a polyamide material, and
50 to 10,000 ppm of an oxygen scavenging material;
wherein the percent polyamide material in the entire packaging article is at least 1.2% by weight.
2. The article of claim 1 , wherein the percent polyamide material in the entire packaging article is less than about 6% by weight.
3. The article of claim 1 , wherein the percent polyamide material in the entire packaging article is less than about 3.6% by weight.
4. The article of claim 1 , wherein the percent polyamide material in the entire packaging article is at least about 1.35% by weight.
5. The article of claim 1 , wherein the polyamide material comprises MXD6.
6. The article of claim 1 , wherein the barrier layer comprises less than 60% by weight of the polyamide material.
7. The article of claim 1 , wherein the barrier layer comprises less than 55% by weight of the polyamide material.
8. The article of claim 1 , wherein the polyester material comprises a polyethylene terephthalate material.
9. The article of claim 1 , wherein the oxygen scavenging material comprises a transition metal.
10. The article of claim 1 , wherein the oxygen scavenging material comprises a cobalt material.
11. The article of claim 1 , wherein the packaging article further comprises a layer of a formable polymer.
12. The article of claim 11 , wherein the formable polymer comprises a polyester.
13. The article of claim 12 , wherein the polyester comprises a polyethylene terephthalate.
14. The article of claim 1 , wherein the barrier layer comprises at least about 3% or more of the total wall thickness of the article.
15. The article of claim 14 , wherein the barrier layer comprises about 10% or less of the total wall thickness of the article.
16. The article of claim 14 , wherein the barrier layer comprises about 8% or less of the total wall thickness of the article.
17. The article of claim 14 , wherein the barrier layer comprises about 6% or less of the total wall thickness of the article.
18. The article of claim 1 , wherein the packaging article comprises a container.
19. A method comprising:
providing a blend material comprising:
between 10 and 60% by weight of a polyester material,
more than 40% by weight of a polyamide material, and
50 to 10,000 ppm of an oxygen-scavenging material; and
forming a packaging article that includes a barrier layer formed from the blend material;
wherein the percent polyamide material in the entire packaging article is at least 1.2% by weight.