Oxygen Scavenging Polymer Layer for Immediate Protection
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Solution Overview
Problem
Existing oxygen scavengers in plastic containers require a prolonged induction period before they can effectively remove oxygen, which is not suitable for commercial practices where immediate protection of oxygen-sensitive products is necessary.
Innovation Solution
A composition comprising a base polymer, a compound of specific formulae, a polydiene compound, and a transition metal in a positive oxidation state, which is substantially free of a compatibilizer, is used to create a layer in packaging that enables immediate oxygen scavenging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art oxygen scavengers (such as diamides) are incorporated into plastic containers, then oxygen scavenging capability is provided, but a prolonged induction period (at least three months at ambient temperature or four weeks at elevated temperature) occurs before oxygen scavenging begins
Solution Approach 1:
The invention changes the chemical structure parameters of the oxygen scavenging compound by using specific formulae I and II with defined heteroatoms (X, Y, A, B, D, E, F) and substituents (R1, R2, R3), which fundamentally alters the reaction kinetics to eliminate the induction period while maintaining scavenging capability
Solution Approach 2:
The invention creates a composite oxygen scavenging system combining the base polymer with compounds of formula I or II and transition metals, where the synergistic interaction between components enables immediate oxygen scavenging without requiring compatibilizers, thus resolving the time delay issue
2Reliability
If prior art oxygen scavengers are used in molded containers, then oxygen protection is eventually achieved, but the induction period makes them unacceptable for commercial practice where immediate protection is required
Solution Approach 1:
The invention prepares the oxygen scavenging system in advance during container manufacturing, with the compound of formula I or II and transition metal already integrated into the polymer matrix, so that oxygen scavenging begins immediately upon container filling without any induction period, meeting commercial productivity requirements
3Stability of the object's composition
If compatibilizer components are added to improve oxygen scavenger performance, then material compatibility is enhanced, but the composition complexity increases and may extend the induction period
Solution Approach 1:
The invention enables the base polymer and oxygen scavenging compounds to be inherently compatible through careful selection of formula I or II structures and transition metals, allowing the system to function without external compatibilizers, thus reducing composition complexity while maintaining stability
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 immediate oxygen scavenging without a measurable induction period, effectively protecting the freshness and quality of oxygen-sensitive products.
Implementation Method 1
at least one transition metal in a positive oxidation state
Implementation Method 2
the composition comprises... at least one polydiene compound; and at least one transition metal in a positive oxidation state
Data Source
AI summary
The disclosure relates to oxygen scavenging polymers, compositions comprising the polymers, articles comprising the polymers and/or compositions, and methods of making the polymers, compositions, and/or articles. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.