Oxygen Scavenger Polymer Composition for Transparent Packaging
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Solution Overview
Problem
Current oxygen scavenging materials in packaging, such as polyamides and potassium sulfite, often result in haze due to immiscibility with base polymer resins and adverse crystallization effects, limiting their use and requiring additional compatibilizers that increase costs and complexity.
Innovation Solution
The development of melt blended polymer compositions comprising a thermoplastic polymer, a transition metal in a positive oxidation state, and a specific compound with a defined formula that enhances oxygen scavenging capability while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen scavenging materials (polyamides, potassium sulfite) are included in packaging, then oxygen barrier capability is improved, but haze increases due to immiscibility with base polymer resins
Solution Approach 1:
The patent changes the chemical structure parameters of the oxygen scavenging material by using compounds with specific formulas (X1-X6 groups, R1 groups, n values) to achieve both oxygen scavenging capability and compatibility with base polymer resins, thereby reducing haze while maintaining barrier properties
Solution Approach 2:
The patent creates a composite oxygen scavenging system combining the base polymer resin with the specific compound formula and transition metal, where the compound acts as both oxygen scavenger and compatibilizer, eliminating the need for separate compatibilizer additives
2Reliability
If oxygen scavenging materials are included in packaging, then oxygen barrier capability is improved, but crystallization behavior of PET base resin is adversely affected
Solution Approach 1:
The patent modifies the chemical parameters of the oxygen scavenging compound (specific formulas with X1-X6, R1, n) to minimize interference with the crystallization kinetics and thermal properties of PET base resin, maintaining composition stability while achieving oxygen scavenging
3Illumination intensity
If compatibilizers are added to reduce haze, then transparency is improved, but material cost and complexity increase
Solution Approach 1:
The patent makes the oxygen scavenging compound itself serve dual functions: as the oxygen scavenger and as the compatibilizer that reduces haze. This multi-functionality eliminates the need for separate compatibilizer additives, reducing material complexity and cost while maintaining transparency
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 effectively scavenges oxygen, reducing haze and crystallization issues, thus providing a high oxygen barrier without the need for additional compatibilizers, thereby improving the preservation of oxygen-sensitive materials.
Implementation Method 1
a transition metal in a positive oxidation state... a compound having the formula: (I) wherein X1, X2, X3, X4, X5, and X6 are each independently: i) ═CR1—; ii) ═N—; iii) —O—; or iv) —S—
Implementation Method 2
a transition metal in a positive oxidation state, the metal present in an amount of from about 10 ppm to about 400 ppm
Data Source
AI summary
The present disclosure relates to oxygen scavenging molecules, compositions comprising the molecules, and articles made from the compositions.