Acrylic-Epoxy Hybrid Laminating Adhesive for Food Packaging
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Solution Overview
Problem
Current waterborne dry laminating adhesives used in food packaging applications face challenges with poor temperature, moisture, and chemical resistance, as well as inadequate adhesion to substrates like foil or metalized films, particularly in medium-high performance applications.
Innovation Solution
A laminating adhesive composition comprising an aqueous dispersion of thermoplastic polymer particles imbibed with an epoxy compound, combined with a water emulsifiable or dispersible epoxy curing agent, such as polyamines or carboxylic functional polyesters, to enhance adhesion and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If waterborne dry laminating adhesives based on acrylic/polyurethane are used, then safety and ease of cleaning are improved, but temperature, moisture, and chemical resistance deteriorate
Solution Approach 1:
The patent combines acrylic polymer particles with epoxy compounds to create a hybrid adhesive system that integrates the safety and ease of cleaning of waterborne adhesives with the superior temperature, moisture, and chemical resistance of epoxy materials. The composition includes acrylic polymer particles imbibed with epoxy compound and a water-emulsifiable or water-dispersible epoxy curing agent, forming a composite material that achieves both safety and performance requirements.
2Ease of operation
If waterborne dry laminating adhesives based on acrylic/polyurethane are used, then ease of operation is improved, but adhesion to foil or metalized films deteriorates
Solution Approach 1:
The adhesive composition uses a composite system combining acrylic polymer with epoxy compound and curing agent, where the epoxy component provides enhanced adhesion to difficult substrates like foil and metalized films while maintaining the waterborne nature of the adhesive for ease of cleaning and application.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating epoxy compounds with specific functional groups and curing agents that enhance adhesion to metallic and foil substrates, while maintaining the waterborne characteristics that provide ease of operation and cleaning.
3Adaptability or versatility
If acrylic latex modified with low molecular weight polyol and water-emulsifiable isocyanate is used, then general and medium performance applications are satisfied, but medium-high performance applications fail
Solution Approach 1:
The patent changes the chemical parameters by replacing the acrylic/polyurethane/isocyanate system with an acrylic/epoxy/curing agent system, where the epoxy compound and curing agent provide the enhanced crosslinking density and chemical resistance required for medium-high performance applications while maintaining waterborne characteristics.
Solution Approach 2:
The invention creates a composite adhesive system combining acrylic polymer particles imbibed with epoxy compound and a water-emulsifiable or water-dispersible epoxy curing agent, producing a material that achieves the performance level required for medium-high demanding applications including better temperature, moisture, and chemical resistance.
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 improved adhesion and resistance to temperature, moisture, and chemicals, leading to increased bond strength and durability of laminates, especially when cured at room temperature or elevated temperatures, thus addressing the limitations of existing adhesives.
Implementation Method 1
an aqueous dispersion of thermoplastic polymer particles imbibed with an epoxy compound... and b) at least one water emulsifiable or water dispersible epoxy curing agent
Implementation Method 2
curing the laminate to form the cured laminate
Implementation Method 3
drying the curable composition
Data Source
AI summary
A laminating adhesive composition comprising a) an aqueous dispersion of thermoplastic polymer particles imbibed with an epoxy compound wherein the concentration of the epoxy compound is from 1 weight percent to 40 weight percent, based on the total weight of the solid content of the aqueous dispersion; and b) at least one water emulsifiable or water dispersible epoxy curing agent selected from polyamines, polyamides, amidoamines, carboxylic functional polyesters, anhydrides, mercaptans, polymer captans, cyclic amidines, and combinations thereof, is disclosed.