Two-Part Oxygen-Absorbable Resin Composition for Flexible Packaging
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Solution Overview
Problem
Existing oxygen-absorbable adhesive agents and packaging materials fail to simultaneously achieve excellent oxygen-absorbing properties, adhesion, and cohesive force, and are often limited by their opacity and requirement for a humid atmosphere.
Innovation Solution
A two-part curable oxygen-absorbable resin composition comprising a polyester polyol with tetrahydrophthalic acid derivatives and an aliphatic or alicyclic isocyanate-based curing agent, such as xylylene diisocyanate, hexamethylene diisocyanate, or isophorone diisocyanate, which forms an adhesive agent suitable for dry lamination with enhanced oxygen absorption and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic oxide having oxygen-absorbing property is blended with a polyol to create an oxygen-absorbable adhesive agent, then oxygen-absorbing property is achieved, but the adhesive agent becomes opaque and poor in oxygen-absorbing performances
Solution Approach 1:
The patent changes the chemical composition parameters by using specific polyester polyols with controlled molecular weights (500-10,000) and specific functional group ratios (hydroxyl groups 2-10 mmol/g), and by controlling the isocyanate index (105-130) to achieve both oxygen-absorbing property and adhesive performance simultaneously
Solution Approach 2:
The patent creates a composite resin composition combining polyester polyol (providing oxygen-absorbing capability through its molecular structure) with aliphatic and/or alicyclic isocyanate-based curing agents (providing adhesion and cohesive force), forming a multi-functional material that achieves all required properties
2Reliability
If conventional oxygen-absorbable adhesive agents are used, then oxygen-absorbing property is achieved, but adhesion and cohesive force are insufficient
Solution Approach 1:
The patent merges two previously separate functions into one adhesive agent: the oxygen-absorbing function (provided by the polyester polyol containing tetrahydrophthalic acid derivatives) and the adhesion function (provided by the isocyanate-based curing agent system), creating a unified material that performs both functions simultaneously with enhanced effectiveness
3Reliability
If existing oxygen-absorbable resin compositions are used, then oxygen-absorbing property is achieved, but the material cannot be used in a dry atmosphere because water is required for oxygen-absorbing performances
Solution Approach 1:
The patent replaces the water-dependent oxygen-absorption mechanism with a water-independent mechanism based on the chemical structure of the polyester polyol and isocyanate curing system, allowing the adhesive agent to absorb oxygen effectively in both humid and dry atmospheric conditions without requiring water as a reactant
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 enables the production of flexible packaging materials with superior oxygen removal performance, effectively maintaining the quality of oxygen-sensitive items like foods and pharmaceuticals over long periods without the need for a humid atmosphere.
Implementation Method 1
a main agent comprising a polyester polyol comprising a tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof as a raw material
Implementation Method 2
an aliphatic and/or alicyclic isocyanate-based curing agent component wherein the aliphatic and/or alicyclic isocyanate-based curing agent component comprises one or more components from the group consisting of xylylene diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate
Data Source
AI summary
The purpose of the present invention is to provide a two-part curable oxygen-absorbable resin composition which has all of oxygen absorbability, adhesion properties and a cohesive force. The present invention provides a two-part curable oxygen-absorbable resin composition comprising: a main component which comprises a polyester polyol containing tetrahydrophthalic acid or a derivative thereof or tetrahydrophthalic acid anhydride or a derivative thereof as a raw material; and an aliphatic and/or alicyclic isocyanate curing agent component.