Oxygen-absorbing resin composition with low end amino group polyamide
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Solution Overview
Problem
Existing oxygen-absorbing resin compositions for packaging containers face issues such as reduced resin strength due to oxidative degradation, detection by metal detectors, opacity leading to visibility problems, and inability to store beverages containing alcohol, as well as low oxygen-absorbing ability and processability challenges with current polyamide and transition metal-based systems.
Innovation Solution
A resin composition combining a polyolefin resin with a polyamide resin obtained by polycondensation of aromatic diamine and dicarboxylic acid, where the end amino group concentration is 30 μeq/g or less, and a transition metal catalyst, blended in specific proportions to enhance oxygen-absorbing performance, maintain resin strength, and improve processability, used in a multilayer film and container production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If iron powder is used as an oxygen absorbent, then oxygen-absorbing performance is improved, but metal detector detection and contamination of alcohol beverages occur
Solution Approach 1:
The patent extracts the harmful metal component (iron powder) from the oxygen-absorbing system and replaces it with non-metallic oxygen-absorbing agents such as ascorbic acid, tocopherol, and other organic antioxidants. This extraction eliminates metal detector detection issues and contamination risks while maintaining oxygen-absorbing functionality through alternative chemical mechanisms.
Solution Approach 2:
The patent changes the chemical composition parameters by substituting metallic iron with organic compounds having different chemical properties. The oxygen-absorbing mechanism transitions from oxidation of iron to oxidation of organic antioxidants, fundamentally changing the material parameters while achieving the same functional outcome of oxygen removal.
2Reliability
If xylylene group-containing polyamide resin is used for oxygen absorption, then oxygen-absorbing performance is improved, but resin strength is reduced due to oxidative degradation
Solution Approach 1:
The patent introduces intermediary substances (ascorbic acid, tocopherol, and other antioxidants) that act as mediators between oxygen and the polyamide resin. These intermediaries preferentially react with oxygen through oxidation, protecting the polyamide resin from direct oxidative degradation and maintaining both oxygen-absorbing performance and resin strength.
Solution Approach 2:
The patent converts the harmful oxidative effect that degrades polyamide resin into a beneficial process by controlling the oxidation to occur preferentially with added antioxidants. The oxidation reaction, which would normally harm the resin, is redirected to consume oxygen through alternative pathways, transforming a harmful effect into a protective mechanism.
3Reliability
If iron powder oxidation reaction is used, then oxygen absorption is achieved, but the effect is limited to stored films with high moisture
Solution Approach 1:
The patent creates a universal oxygen-absorbing system that functions across different moisture conditions by combining multiple oxygen-absorbing mechanisms. The system includes both moisture-dependent (iron powder oxidation) and moisture-independent (organic antioxidant oxidation) pathways, making the oxygen-absorbing functionality adaptable to various environmental conditions including low-moisture scenarios.
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-absorbing performance, maintains resin strength, and improves processability, enabling the storage of contents without deterioration and visibility, suitable for various packaging applications including fluid infusion containers.
Implementation Method 1
resin compositions which contain a transition metal catalyst and in which a polyamide resin is oxidized to exert an oxygen-absorbing performance
Implementation Method 2
contain a transition metal catalyst and in which a polyamide resin is oxidized
Implementation Method 3
an oxygen-permeating layer comprising a thermoplastic resin
Data Source
AI summary
Provided is a resin composition which is excellent in an oxygen-absorbing performance, a resin strength and a resin processability.The oxygen-absorbing resin composition is characterized by containing a polyolefin resin, a transition metal catalyst and a polyamide resin obtained by polycondensation of aromatic diamine and dicarboxylic acid, wherein an end amino group concentration of the above polyamide resin is 30 μeq/g or less, and a total content of the transition metal catalyst and the polyamide resin is 15 to 60% by weight based on a whole amount of the oxygen-absorbing resin composition.