Oxygen Scavenging Polyamide Compositions for PET Packaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current oxygen scavenging materials in packaging cause haze due to immiscibility with base polymers and adverse crystallization effects, limiting their transparency and oxygen barrier properties, especially in PET-based packaging.
Innovation Solution
Compositions comprising a base polymer, specific compounds of Formula I or II, and a transition metal in a positive oxidation state, which are designed to improve dispersibility and reduce haze while maintaining high oxygen scavenging capability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen scavenging materials are incorporated into PET packaging, then oxygen barrier properties are improved, but haze increases due to immiscibility and adverse crystallization effects
Solution Approach 1:
The patent changes the chemical structure parameters of the oxygen scavenging material by using polyamides containing meta-xylene residues (MXD6) with specific molecular configurations. This structural modification improves miscibility with PET base polymer, reducing haze while maintaining oxygen scavenging capability. The specific parameter changes in the polyamide structure allow it to integrate better into the PET matrix without causing phase separation or excessive crystallization.
Solution Approach 2:
The patent creates a composite material system by combining PET base polymer with specific polyamides (MXD6) containing meta-xylene residues. This composite approach allows the oxygen scavenging polyamide to be dispersed within the PET matrix, providing oxygen barrier properties while the specific chemical compatibility of MXD6 with PET minimizes haze formation. The composite structure enables both functionalities to coexist effectively.
2Reliability
If oxygen scavenging materials are dispersed in base polymer resin, then oxygen scavenging capability is improved, but dispersibility is poor leading to phase separation
Solution Approach 1:
The patent modifies the chemical parameters of the oxygen scavenging material by selecting polyamides with meta-xylene residues (MXD6) that have specific molecular structures. These structural parameters are chosen to enhance compatibility with PET base polymer, improving dispersibility and preventing phase separation. The parameter changes in the polyamide structure enable better integration into the polymer matrix while maintaining scavenging functionality.
Solution Approach 2:
The patent achieves homogeneity by using polyamides (MXD6) that are chemically compatible with PET base polymer. The specific molecular structure of MXD6 containing meta-xylene residues allows it to mix uniformly with PET, creating a homogeneous composite material. This homogeneity prevents phase separation and ensures consistent oxygen scavenging performance throughout the packaging material.
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, maintaining transparency and enhancing the oxygen barrier properties of packaging materials, thereby extending the shelf life of oxygen-sensitive products.
Implementation Method 1
compositions that serve as compatibilizers to reduce haze... an oxidizable organic component, and a transition metal
Implementation Method 2
a transition metal in a positive oxidation state, said metal being present in the composition in an amount of 10 to 400 ppm
Data Source
AI summary
The invention relates to compounds of the structure of formula I and II:where X is selected from the group consisting of O, S and NH; Y, A and B are independently selected from the group consisting of N and CH; D, E and F are independently selected from the group consisting of CH, N, O and S; the symbol ---- represents a single or a double bond; and R1, R2 and R3 are independently selected from the group consisting of H, electron withdrawing groups and electron releasing groups. In other embodiments, the compounds are used as oxygen scavengers and in barrier compositions and articles.