Oxygen Scavenging Polymers for Clear Packaging
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Solution Overview
Problem
Current packaging materials, such as PET, are porous to gases like oxygen, limiting their use for oxygen-sensitive products like beer and juice, as they fail to prevent oxygen degradation, and existing active oxygen scavengers are either ineffective or aesthetically unsuitable for clear containers and renewable sources.
Innovation Solution
Development of oxygen scavenging molecules and polymers derived from isoprenoids, which can be genetically modified from renewable carbon sources, incorporated into packaging materials to effectively reduce oxygen levels within sealed containers, maintaining freshness for extended periods without affecting the container's clarity or color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PET containers are used for packaging, then high strength and widespread use are achieved, but oxygen transmission occurs limiting use for oxygen-sensitive products
Solution Approach 1:
The patent incorporates oxygen scavenger additives into the PET polymer matrix to create a composite material that combines the mechanical strength of PET with oxygen-scavenging functionality. The scavenger molecules are dispersed throughout the polymer structure, allowing the container to maintain its structural integrity while actively removing oxygen that penetrates through the porous PET material.
2Object-affected harmful factors
If multi-layer barrier layers are added to block oxygen, then oxygen transmission is reduced, but complexity and cost increase
Solution Approach 1:
The patent extracts the oxygen barrier function from the structural container walls and implements it through a separate active oxygen scavenger system embedded in the polymer. Instead of adding multiple physical barrier layers to the container structure, the scavenger molecules are incorporated into the existing single-layer PET material, separating the structural function from the protective function.
Solution Approach 2:
The oxygen scavenger acts as an intermediary substance that chemically interacts with oxygen molecules that penetrate the PET container. Rather than relying on physical barrier layers to block oxygen, the scavenger mediates the oxygen removal process through chemical reactions, converting gaseous oxygen into bound forms that cannot harm the contents.
3Reliability
If inorganic oxygen scavengers like reduced metal powders are used, then oxygen scavenging capability is achieved, but aesthetic quality deteriorates due to haze and coloring
Solution Approach 1:
The patent changes the chemical composition parameters of the oxygen scavenger from inorganic metal powders to organic molecules with specific chemical structures. The organic scavengers have molecular sizes and optical properties that allow them to remain dissolved or finely dispersed in the polymer matrix without scattering light, thereby maintaining container clarity while providing effective oxygen scavenging through their chemical reactivity with oxygen.
4Reliability
If conventional oxygen scavengers are used, then oxygen removal is achieved, but renewable sourcing is not available
Solution Approach 1:
The patent changes the source material parameters by deriving oxygen scavenger molecules from renewable carbon sources such as plant-based feedstocks or bio-based chemicals. The molecular structure is designed to incorporate carbon atoms from renewable sources while maintaining the necessary functional groups for oxygen scavenging activity, thereby providing a sustainable alternative to petroleum-based scavengers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These oxygen scavenging molecules and polymers efficiently maintain oxygen levels below 10 ppm for several months, enhancing the shelf life of oxygen-sensitive products while allowing for clear and aesthetically pleasing packaging.
Implementation Method 1
The oxygen scavengers are capable of consuming oxygen when catalyzed by an oxidation catalyst
Implementation Method 2
when catalyzed by an oxidation catalyst
Data Source
AI summary
Described herein are oxygen scavengers, oxygen scavenging polymeric compositions, and oxygen scavenging articles. The polymeric compositions comprising the oxygen scavengers may have utility in packaging, sealing, wrapping, and storing oxygen-sensitive substances, e.g., to preserve freshness of foods, beverages, and the like.