 Box top lid |
| OF THE PREFERRED EMBODIMENTS Turning now descriptively to the drawings, in which like reference ... |
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| Freshness-preserving container |
| It is an object of the present invention to provide a package of the type described above which ... |
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| Moisture-proof resealable pouch and container |
| OF PREFERRED EMBODIMENTS The pouches, closures and associated containers of the present invention ... |
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| Moisture-proof resealable pouch and container |
| OF PREFERRED EMBODIMENTS The pouches, closures and associated containers of the present invention ... |
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| Microbiological assembly comprising resealable closure means |
| The present invention provides a microbiological assembly which is covered with a resealable cover ... |
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| Single-piece paper cup sip adaptor |
| Referring to FIGS. 1 5 wherein the showings are for purposes of illustrating one embodiment of the ... |
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| Iron oxide pigments |
| We claim: 1. A pigment comprising a non platelet-shaped silica, zirconium dioxide and/or titanium ... |
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| Pigment mixture |
| We claim: 1. A pigment mixture comprising a component A, which comprises undoped and transparent ... |
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| Colored and coated plateletlike pigments |
| What is claimed is: 1. A platelet-shaped pigment, consisting essentially of an inorganic, platelet-... |
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| Colored composition |
| OF THE EMBODIMENTS As follows is a description of preferred embodiments of a colored composition ... |
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Oxygen scavenging composition for multilayer preform and container
| Details |
Inventors: Collette, Wayne N.; Schmidt, Steven L.;
Assignee: Continental PET Technologies, Inc. (Florence, KY)
Primary Examiner: Nold; Charles
Assistant Examiner:
Attorney, Agent or Firm: Wolf, Greenfield & Sacks, P.C.
An oxygen scavenging composition, method of making the same, and multilayer container structures thereof which enable accelerated activation of the oxygen scavenging property and/or barrier layers to prevent depletion of the oxygen scavenging property. In making a container wall, or a precursor thereof such as a preform, a base polymer is used including post-consumer polyethylene terephthalate (PC-PET) and an oxygen scavenger. A resulting multilayer package wall may include an oxygen scavenging core layer and an inner layer of a material having a high oxygen barrier condition prior to product filling, and a second lower oxygen barrier condition after product filling. The inner layer thus allows oxygen entrapped in the container during product filling to be transmitted through the inner layer and absorbed by the core oxygen scavenging layer, in order to increase the product shelf life. |
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DETAILED DESCRIPTION There are multiple aspects of the present invention which can be used together or separately to enable the manufacture of packaging for oxygen sensitive products.
In one aspect, the invention provides an oxygen scavenging composition which incorporates the use of post consumer polyethylene terephthalate (PC-PET) in an amount effective to accelerate activation of the oxygen scavenger.
The PC-PET may comprise at least on the order of 50%, and more specifically on the order of 90-100%, as a percentage of the total weight.
In a second aspect, preform and container multilayer structures are provided which include an oxygen-scavenging core layer with PC-PET, between inner and outer layers of one or more barrier polymers which retard the migration of the oxygen scavenger and its byproducts.
The core layer scavenges oxygen from the interior of the filled package, and prevents exterior oxygen from reaching the contents of the package.
The inner layer protects the food product from contact with the oxygen scavenger, its byproducts, and/or PC-PET contaminates.
In a third aspect, a method of making a preform is provided including preparing a masterbatch of PET and an oxygen scavenger, preparing a first blend of the masterbatch and a PET component including PC-PET, and then forming a preform having a core layer of the first blend and inner and outer layers of one or more barrier polymers which retard the migration of the oxygen scavenger and its byproducts.
The masterbatch preparation takes place in a moisture and oxygen protected environment to prevent premature activation of the oxygen scavenger; similarly, the first blend preparation takes place in a controlled environment to prevent depletion of the oxygen scavenging effect (following activation).
The masterbatch may comprise on the order of 50-90% PET, and 10-50% oxygen scavenger.
The first blend may comprise on the order of 1-10% masterbatch and 90-99% polymer, which includes at least on the order of 50% PC-PET.
In a particular embodiment, the masterbatch is on the order of 50% virgin PET, 50% polyamide, and 3000-6500 ppm metal catalyst; the first blend is on the order of 96-98% PC-PET, 2-4% masterbatch, and 250-500 ppm metal catalyst
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Manufacturing Materials 
