Multilayered package with barrier properties
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Accused Products
Abstract
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 .
31 Citations
44 Claims
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1-24. -24. (canceled)
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25. A method of making a multilayered container, comprising:
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providing a blend material comprising between and 70% by weight of a polyester material, more than 30% by weight of a polyamide material, and 50 to 10,000 ppm of an oxygen scavenging material;
providing a formable polymer;
forming a multilayered preform from the blend material and the formable polymer; and
forming a multilayered container from the preform, wherein the container comprise a blend layer formed from the blend material that comprises between about 2 and about 10% of the total wall thickness of the container. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of making a multilayered container, comprising:
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providing a core layer blend material comprising between 10 and 70% by weight of a polyester material, more than 30% by weight of a polyamide material, and an oxygen-scavenging nano-particulate material; and
molding the core blend material to form a core layer of a multilayered container.
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40. A method of making a multilayered container, comprising:
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providing a blend material comprising between and 60% by weight of a polyester material, between 45 and 60% by weight of a polyamide material, and 50 to 10,000 ppm of an oxygen scavenging material;
forming a multilayered container that comprises a layer of a formable polymer and a blend layer formed from the blend material, wherein the blend layer comprises between about 3 and 6 percent of the total wall thickness of the container and the percent polyamide material in the entire container is between 1.35 and 3.6% by weight. - View Dependent Claims (41, 42, 43, 44)
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Specification