Oxygen-absorbing resin composition with transition metal catalyst
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Solution Overview
Problem
Existing oxygen-absorbing resin compositions for packaging materials face issues with high costs due to the use of specific benzophenone derivatives as photoinitiators, odor by-products, and surface defects like 'fish eyes' in multilayer bodies, which affect their transparency and appearance.
Innovation Solution
An oxygen-absorbing resin composition comprising an easily oxidizable thermoplastic resin, such as polybutadiene, and a transition metal catalyst, which initiates oxygen absorption upon energy ray irradiation, reducing or omitting the need for photoinitiators, thereby minimizing odor and surface defects while maintaining effective oxygen absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a benzophenone derivative photoinitiator is used to initiate oxygen absorption, then oxygen absorption performance is improved, but cost increases and migration to outside the resin composition occurs
Solution Approach 1:
The patent removes the photoinitiator component from the resin composition entirely, replacing it with a transition metal catalyst system that initiates oxygen absorption through a different mechanism involving the oxidation of the thermoplastic resin by oxygen itself, thereby eliminating migration issues while maintaining oxygen absorption functionality
Solution Approach 2:
The patent uses a transition metal catalyst that can be easily removed or decomposed, replacing the persistent photoinitiator, allowing the system to initiate oxygen absorption without leaving harmful residual substances that could migrate
2Reliability
If a benzophenone derivative photoinitiator is used, then oxygen absorption is initiated, but odor occurs as a by-product
Solution Approach 1:
The patent changes the chemical mechanism from photoinitiator-based radical formation to transition metal-catalyzed oxidation, fundamentally altering the reaction pathway to eliminate odor-producing by-products while maintaining effective oxygen absorption initiation
Solution Approach 2:
The patent converts the potentially harmful photoinitiator that causes odor into a beneficial transition metal catalyst system that initiates oxygen absorption through resin oxidation, turning a harmful initiation method into a clean and efficient process
3Reliability
If a photoinitiator is contained in the resin composition, then oxygen absorption can be initiated, but a large number of gels occur and surface defects called fish eyes occur in multilayer bodies
Solution Approach 1:
The patent extracts and removes the photoinitiator from the resin composition, eliminating the cause of gel formation and fish eye defects while replacing it with a transition metal catalyst system that initiates oxygen absorption without causing surface defects
Solution Approach 2:
The patent uses a transition metal catalyst that does not persist in the resin composition, avoiding the accumulation and aggregation problems that lead to gel formation and surface defects, while maintaining effective oxygen absorption initiation
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 achieves satisfactory oxygen absorption performance with reduced photoinitiator content, suppresses odor occurrence, and produces multilayer bodies with improved transparency and appearance, making it suitable for food packaging applications.
Implementation Method 1
an oxygen-absorbing resin composition which includes an easily oxidizable thermoplastic resin and a transition metal catalyst, and which initiates oxygen absorption by irradiation of the oxygen-absorbing resin composition with an energy ray
Data Source
AI summary
The present invention provides an oxygen-absorbing resin composition having a satisfactory oxygen absorption performance and suppressing the occurrence of odor after oxygen absorption, even in an aspect substantially containing no photoinitiator, and an oxygen-absorbing multilayer body using the oxygen-absorbing resin composition. An oxygen-absorbing resin composition initiating oxygen absorption by irradiation with an energy ray, the composition including an easily oxidizable thermoplastic resin and a transition metal catalyst, and wherein the easily oxidizable thermoplastic resin includes a polybutadiene (X) and a resin (Y) having carbon-carbon double bonds and the constitutional unit of the following general formula (1):(wherein R1 to R7 each represent —H, —CH3, —CH2R, —CHR2, —CR3, —OR, —COOR, —SiR3, —O—SiR3, —COCl or a halogen atom, and may be the same as each other or different from each other, and R represents a linear or cyclic alkyl, alkenyl, halogenated alkyl, halogenated alkenyl or aryl group.)