Oxygen Scavenging Compositions and Packaging Comprising Said Compositions

a composition and oxygen scavenging technology, applied in the direction of synthetic resin layered products, containers preventing decay, explosives, etc., can solve the problems of narrow narrow restriction of the choice of base polymer resin and add cost to the layer, and achieve the effect of eliminating haz

Inactive Publication Date: 2009-11-12
CONSTAR INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0061]In preferred embodiments of the invention, the compositions described herein are used in monolayer bottles. These compositions are advantageous in substantially eliminating haze in such compositions compared to other commercial oxygen scavengers used in monolayer applications. In other embodiments the compositions are used in one or more layers of a multi-layer wall of a package, giving protection of the contents against oxygen without adding haziness to the wall.

Problems solved by technology

In barrier layers of packaging walls that are made from blends of oxygen scavenging materials with base polymer resins such as PET, haze can result due to such factors as: the immiscibility of the scavenging materials with the base polymer resins, and the inability to create by mechanical blending means disperse-phase domains that are so small as not to interfere with the passage of light therethrough; and the adverse influence of the scavenging material on the crystallization behavior of PET base resin.
This approach may undesirably narrowly restrict the choice of base polymer resin.
These approaches add cost to the layer and the compatibilizer adds an additional material that must be evaluated for its suitability for contact with food.

Method used

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  • Oxygen Scavenging Compositions and Packaging Comprising Said Compositions
  • Oxygen Scavenging Compositions and Packaging Comprising Said Compositions
  • Oxygen Scavenging Compositions and Packaging Comprising Said Compositions

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0160]Extruded strips were prepared using a bench-top Killion extruder (with typical extruder output rate between 8-10 lbs / hour) for evaluating oxygen scavenging potential using Oxy-Sense™ for Monomer-I and Monomer-II. The temperature profile across different extruder zones used was typical to that used for PET (about 525° F.). Extruded films were cut into thin strips and about 2 g samples for each formulation were sealed into 22 mL glass vials and stored at elevated temperature (70° C.). The % oxygen depletion inside the vials over time was monitored using commercially available Oxy-Sense™ instrument. Different formulations and their respective code names are given below:

[0161]1. PET+3% 6007+100 ppm Co carboxylate powder (Code: T10)

[0162]2. PET+3% Monomer-I+100 ppm Co carboxylate powder (Code: M-I 3-100)

[0163]3. PET+3% Monomer-I+200 ppm Co carboxylate powder (Code: M-I 3-200)

[0164]4. PET+5% Monomer-I+100 ppm Co carboxylate powder (Code: M-I 5-100)

[0165]5. PET+5% Monomer-I+200 ppm C...

example 2

[0172]Preforms were injection molded on a 2 cavity Husky LX160 PET injection molding machine. Preforms were made with the following formulations:

[0173]Heat Wave™ (Voridian) PET+3% Monomer-I+75 ppm Co carboxylate powder

[0174]Heat Wave PET+3% Monomer-II+75 ppm Co carboxylate powder

[0175]PET, Monomer-I (in powder form) and Cobalt carboxylate mixture (cobalt neodeconate (Co NDA, CAS #27253-31-2) and cobalt propionate (CAS#1560-69-6) mixture with a 20.5% Co metal content) were tumble blended in a bucket and fed into the machine hopper. Actual final composition in the preform was not verified. Bottles were blown on the unit cavity Re-heat and blow lab machine for oxygen transmission rate (OTR) and haze measurement.

Monomer-I Trial Results:

[0176]20 oz bottles were blown form preforms and stored empty at STP conditions prior to testing. Two sets of the empty bottles were mounted on an oxygen permeation measuring device—similar to MoCon Oxtran analyzer. The first set (A) were mounted 2 days a...

example 3

[0180]Preforms were made on Husky LX 160 PET, 2 cavity machine using the following formulation: Vitiva™ PET+3% N,N′ Bis (phenylmethyl) hexane diamide (Monomer-I)+75 ppm Co. Vitiva PET and Monomer-I powder were tumble blended in a bucket and fed into the machine hopper. Cobalt-NDA dispersed in a liquid hydrocarbon carrier, was introduced using a ColorMatrix brand positive displacement pump. Actual final composition in the preform was verified by performing Nitrogen and ICP analysis Bottles were blown on a unit cavity 16 oz blow mold using a Sidel SBO-1 machine. Bottles were blown and were mounted on an oxygen permeation measuring device—similar to MoCon Oxtran analyzer—13 days after manufacture.

Trial Results:

[0181]The graph in FIG. 6 shows the OTR performance.

[0182]As cab be seen from the graph in FIG. 6, some scavenging is evidenced. In order to determine the scavenging potential, samples from the side wall of the container were sealed into a 20 mL vial and decrease in oxygen % over...

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Abstract

The instant invention concerns a composition comprising a base polymer, at least one compound of the formula E-(L-E)x wherein: E is formula (I) or formula (II) and L is a linking group; and at least one transition metal in a positive oxidation state. The invention also concerns packages containing walls comprising such compositions, methods of forming such packages, and methods of packaging an oxygen-sensitive item within such a package.

Description

RELATED APPLICATIONS[0001]This application claims benefit of U.S. Application No. 60 / 652,888 filed Feb. 15, 2005, the contents of which are incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to substantially transparent compositions that comprise a base polymer, an oxidizable organic component, and a transition metal. The invention also concerns use of such compositions in the construction of packaging for oxygen sensitive materials.BACKGROUND OF THE INVENTION[0003]It is known in the art to include an oxygen scavenger in the packaging structure for the protection of oxygen sensitive materials. Such scavengers are believed to react with oxygen that is trapped in the package or that permeates from outside of the package, thus extending to life of package contents. These packages include films, bottles, containers, and the like. Food, beverages (such as beer and fruit juices), cosmetics, medicines, and the like are particularly sensitive to oxyge...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L67/00C07C237/00
CPCA23L3/3436B32B27/18B32B27/36C01B13/0237C01B13/0281C08K5/098Y02E60/324C08K2201/012C08K5/20Y10T428/1379Y10T428/26Y10T428/1355C08L67/02Y10T428/31797C08J3/223C08J2367/02B01J20/22B65D81/26B65D81/24C01B3/00C06B23/00Y02E60/32
Inventor DESHPANDE, GIRISH NILKANTHGOVINDARAJAN, VENKATROST, JOHN M.SILVERMAN, ALAN
Owner CONSTAR INT
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