Polyether-Polyester Copolymer Oxygen Scavenging Packaging
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Solution Overview
Problem
Current packaging materials, such as PET, face challenges in maintaining oxygen barrier properties while preserving recyclability and clarity, especially for oxygen-sensitive products like beverages and sauces, as existing solutions either compromise on recyclability or do not finely tune the oxygen scavenging rate to meet specific product needs.
Innovation Solution
A polyether-polyester copolymer with specific structural segments and end-caps is integrated into thermoplastic materials, combined with a transition metal catalyst, to create an active oxygen barrier that can control the oxygen scavenging rate effectively, ensuring high oxygen barrier properties without sacrificing recyclability or clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multilayer structures with high barrier polymers are used, then oxygen barrier properties are improved, but recyclability is worsened
Solution Approach 1:
The invention extracts the oxygen scavenging function from separate multilayer structures and integrates it into a single-layer PET container through incorporated oxygen scavenging compositions, eliminating the need for complex multilayer constructions while maintaining barrier properties and preserving recyclability
Solution Approach 2:
The invention creates a composite material system by combining PET with oxygen scavenging compositions and catalysts within a single-layer structure, achieving both oxygen barrier functionality and recyclability that neither component could provide alone
2Reliability
If multilayer structures with high barrier polymers are used, then oxygen barrier properties are improved, but clarity is worsened
Solution Approach 1:
The invention removes the need for opaque or translucent multilayer barrier structures by integrating oxygen scavenging functionality into clear single-layer PET, thereby maintaining optical clarity while achieving superior oxygen barrier properties
Solution Approach 2:
The invention changes the approach to oxygen barrier from physical structural complexity (multilayers) to chemical functionality (oxygen scavenging compositions), allowing the use of clear materials without compromising barrier performance
3Reliability
If oxygen scavenging compositions are incorporated into polymer resin, then oxygen scavenging capacity is improved, but oxygen scavenging rate control is worsened
Solution Approach 1:
The invention changes the control mechanism for oxygen scavenging rate by introducing catalysts with different activities and adjusting composition concentrations, enabling fine-tuning of scavenging kinetics to match specific product requirements
Solution Approach 2:
The invention implements a controlled oxygen scavenging system where catalysts regulate the oxidation reaction rate, creating a feedback mechanism that maintains optimal oxygen levels throughout the product shelf life rather than uncontrolled consumption
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
The solution provides a high oxygen scavenging capacity with fine-tuned oxygen transmission rates, maintaining product freshness and extending shelf life while maintaining the recyclability and transparency of packaging materials.
Implementation Method 1
The method of providing oxygen barrier properties where a substance consumes or reacts with the oxygen is known as a (re)active oxygen barrier... Several oxygen scavenging systems are known in the art. Among others, oxygen-scavenging compositions comprising an oxidizable substituted or unsubstituted ethylenically unsaturated hydrocarbon and a transition metal catalyst are well-known viable solutions.
Data Source
AI summary
The invention relates to a polyether-polyester copolymer comprising: (i) polyether segments wherein at least one polyether segment contains at least one polytetramethylene oxide segment, (ii) polyester segments, (iii) bridging elements of the structure —CO—R2-CO—, wherein R2 represents an optionally substituted bivalent hydrocarbon residue consisting of 1 to 100 carbon atoms; (iv) one or two end-caps R1-O—(C2-C4—O—)e—*, wherein R1 is an optionally substituted hydrocarbon residue and e is an integer of from 0 to 1000.