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Modified container

Inactive Publication Date: 2004-07-22
TWINPAK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It has now surprisingly been found that the oxygen transmission rate and capacity of the gas scavenging material may be greatly improved by applying an external passive barrier to gas flow both from exterior of the bottle and from interior of the bottle to at least the walls of the container.
[0008] Accordingly, in one aspect of the present invention, there is provided a packaging article having at least a wall constructed of a polyester and having an oxygen scavenging material therein and having an external barrier to gas flow therein. Since the oxygen barrier performance of the wall is improved, the quantity of active oxygen scavenger material can be significantly reduced while, at the same time, achieving an improved shelf-life.

Problems solved by technology

Such scavenging materials tend to be expensive.
The gas scavenging material eventually becomes exhausted of the ability to absorb oxygen, which leads to concerns with respect to empty bottle life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] This Example illustrates the invention.

[0024] A 34 g PET beer bottle having 1% of an oxygen scavenger dispersed in the walls was provided with an epoxy-amine coating. An improvement in oxygen barrier rate when compared to the absence of the epoxy-amine coating was determined to be 3.8 times.

example 2

[0025] This Example illustrates the significant effect of an oxygen scavenger in conjunction with an external barrier layer.

[0026] Polyethylene-terephthalate (PET) bottles were blown from a blend of commercial PET and 1 wt % Amosorb (OFC grade) with 473 ml capacity. Amosorb is a proprietary oxygen scavenging copolymer material supplied by BP chemicals. The copolymer is a copolymer of PET having polybutadiene oligomer segments and is produced as described in the aforementioned U.S. Pat. No. 6,083,585. The bottles were spray coated on the outside of the bottles with a contiguous outer film of an epoxy-amine resin supplied by PPG Industries under the trademark "BAIROCADE" and produced as described in the aforementioned U.S. Pat. No. 5,637,365. The thickness of the layer was about 0.4 mil.

[0027] Control bottles were also prepared in which there was only no modification to the bottle walls, in which only 1% Amosorb was present and in which only the epoxy-amine resin coating was present.

[...

example 3

[0030] This Example illustrates the synergistic effect of an oxygen scavenger material in conjunction with an external barrier layer.

[0031] The procedure of Example 2 was repeated except that a comparison was made between bottles which were filled immediately after the bottles were made and these which were filled after 5 weeks standing empty ("aged").

[0032] The results obtained for oxygen absorbance of the aged bottles were plotted graphically and appear in FIG. 3. These results show the same kind of results as FIG. 1 for the unaged bottles. The oxygen transmission rate (OTR) for the aged and unaged ("Time 0") bottles were plotted graphically and appear in FIG. 4. These results show that, while the 1% Amosorb containing bottles exhibited a greater OTR in the aged bottles, showing some loss of effectiveness of the Amosorb material, the external epoxy-amine coating significantly reduced the OTR by an order of magnitude.

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Abstract

The gas permeance of polyester bottles or other packaging article is improved by the combination of an oxygen scavenging material provided in the wall of the article and an external barrier to gas flow.

Description

[0001] This invention relates to a packaging article, specifically a normally air-permeable container, which has been modified to reduce its gas permeability.BACKGROUND TO THE INVENTION[0002] Polyethylene-terephalate (PEI) is widely used as the construction material for packaging articles for a variety of beverages, for example, juices, which may be carbonated, such as soft drinks and beer. PET is known to be permeable to gases, such as oxygen and carbon dioxide, which leads to a finite shelf-life to oxygen-sensitive products, such as juices and beer, packaged therein.[0003] Attempts have been made to decrease the permeability of PET bottle walls by manipulation of the structure of the wall, to provide a shelf-life at least 2 to 3 times that of the unmodified bottle. One manner of manipulation of the structure of the wall is to incorporate substances capable of intercepting or scavenging oxygen as it attempts to pass through the walls of the container.[0004] One method for use of su...

Claims

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Application Information

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IPC IPC(8): B65D1/02B65D81/26C08L67/02
CPCB65D1/0207B65D81/266Y10T428/1352C08L67/02C08L53/00
Inventor MULHOLLAND, LINDSAYGOODRICH, NINASENIOR, DAVIDCHIU, BORISLI, STEVEN
Owner TWINPAK
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