Two-Component Polyurethane Adhesive for Hot Filling
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Solution Overview
Problem
Existing polyurethane adhesives for hot filling applications face challenges in maintaining adhesive strength and ease of application at high temperatures while adhering to regulatory limits for substances like GLYMO.
Innovation Solution
A two-component polyurethane adhesive composition comprising a polyol component made from a reaction product of cycloaliphatic, heterocyclic, aliphatic, and polyfunctional carboxylic acids, and an isocyanate component with alkoxysilane functionalization, aromatic, and aliphatic or alicyclic isocyanate compounds, without epoxide groups or GLYMO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If GLYMO is used as adhesion promoter in polyurethane adhesive, then adhesion performance is improved, but regulatory compliance deteriorates due to genotoxicity concerns
Solution Approach 1:
The invention extracts and removes the harmful GLYMO component from the adhesive formulation. The patent explicitly eliminates epoxidized silane compounds like GLYMO that are genotoxic, while maintaining adhesion performance through alternative chemical compositions involving polyether polyols, polyester polyols, and specific isocyanate compounds that comply with food contact regulations.
Solution Approach 2:
The invention replaces the problematic GLYMO substance with alternative adhesion promoters that are safer and compliant with regulations. The patent uses conventional polyols and isocyanates that can achieve similar adhesion performance without the genotoxicity issues, effectively substituting a harmful short-term solution with a safe long-term solution.
2Temperature
If high temperature resistance is improved for hot filling applications, then adhesive strength is maintained, but formulation complexity increases
Solution Approach 1:
The invention achieves high temperature resistance by carefully selecting and adjusting the parameters of conventional polyol and isocyanate components. The patent specifies particular polyether polyols with certain molecular weights and polyester polyols with specific acid values, along with aromatic and aliphatic isocyanates, to create a formulation that maintains adhesive strength at elevated temperatures without requiring complex additive systems.
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 adhesive composition maintains excellent bonding strength and heat seal strength even after storage, suitable for high-temperature food contact and medical retort applications, while ensuring compliance with regulatory limits.
Implementation Method 1
polyurethane based adhesives are preferred for use in flexible packaging materials... an isocyanate-containing polyurethane prepolymer obtained by the reaction of excess diisocyanate with a polyether and/or polyester containing two or more active hydrogen groups per molecule is used in combination with a second component
Implementation Method 2
The two components are combined just before use and in a predetermined ratio and applied on one of the film surfaces and the coated film is laminated to another substrate
Data Source
Figure 1
AI summary
The present invention relates to a two-component polyurethane adhesive composition for film lamination in hot filling application. Further, the present invention relates to method of manufacturing a laminate by using the two-component polyurethane adhesive composition and the laminate obtainable by the described method.