Oxygen-absorbing resin composition with bifunctional stabilizer
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Solution Overview
Problem
Existing oxygen-absorbing resin compositions used in packaging materials decompose during oxygen absorption, leading to unpleasant odors and inadequate gas barrier properties, which affect the quality of packaged products, especially food.
Innovation Solution
A resin composition comprising a gas barrier resin with low oxygen transmission rate, a thermoplastic resin with specific repeating units, a metal salt, and a bifunctional processing stabilizer, along with a phenolic primary antioxidant, to enhance oxygen absorption while minimizing odor generation and improving processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oxygen-absorbing resin composition is used to absorb oxygen in packaged products, then oxygen transmission is reduced, but the composition decomposes and generates unpleasant odor
Solution Approach 1:
A phenolic primary antioxidant is introduced as an intermediary substance to protect the oxygen-absorbing resin composition from decomposition. The antioxidant acts as a mediator between the thermoplastic resin and oxygen, preventing the formation of unpleasant odors while allowing controlled oxygen absorption to proceed
Solution Approach 2:
The patent converts the potentially harmful decomposition reaction into a beneficial process by using the phenolic antioxidant to control the oxidation mechanism. The antioxidant sacrifices itself to prevent the degradation of the oxygen-absorbing components, transforming what would be a harmful side reaction into a protective mechanism
2Reliability
If a gas barrier resin is used to reduce oxygen transmission, then oxygen barrier properties are improved, but gas transmission is not completely zero and non-negligible amounts of gas are transmitted
Solution Approach 1:
The patent creates a composite material system combining a gas barrier resin with an oxygen-absorbing resin composition. This composite structure leverages the low gas transmission properties of the barrier resin while the oxygen-absorbing components actively remove transmitted oxygen, achieving near-complete oxygen protection
Solution Approach 2:
The patent applies different functional properties to different parts of the packaging system: the gas barrier resin provides low gas transmission properties in one layer, while the oxygen-absorbing resin composition provides active oxygen removal in another layer, creating a multi-functional packaging structure
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 composition achieves excellent oxygen-absorbing properties with reduced odor generation and improved processability, suitable for packaging oxygen-sensitive products, maintaining high gas barrier properties over time.
Implementation Method 1
Compositions containing a thermoplastic resin having an unsaturated hydrocarbon, and a transition metal catalyst have been proposed as ingredients suitable for oxygen absorption
Implementation Method 2
Gas barrier resins, for example, ethylene-vinyl alcohol copolymers (hereinafter, also abbreviated as EVOH) are materials having excellent oxygen barrier properties
Data Source
AI summary
An oxygen-absorbing composition of the present invention contains: a gas barrier resin (A) having an oxygen transmission rate of 500 mL·20 µm/(m2·day·atm) or less as measured at 20°C and 65%RH; a thermoplastic resin (B) including repeating units represented by General Formula (I) below (where X is a methylene group or an oxygen atom, R1 is an alkenylene group having 3 to 12 carbon atoms, and n is an integer of 5 to 5000); at least one type of metal salt (C) selected from the group consisting of an iron salt, a nickel salt, a copper salt, a manganese salt, and a cobalt salt; and a bifunctional processing stabilizer (D) that is a compound having an acrylate structure and a hindered phenol structure in a same molecule. The oxygen-absorbing resin composition of the present invention performs excellent oxygen-absorbing properties, and enables to reduce generation of an unpleasant odor caused by decomposition of the oxygen-absorbing composition during oxygen absorption.