Ray-Curable Adhesive Composition for Solvent-Free Film Lamination
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Solution Overview
Problem
Existing active energy ray-curable adhesives have limited versatility due to their requirement for a highly adhesive layer and poor adhesion to films without such layers, and they contribute significantly to environmental pollution due to the use of organic solvents.
Innovation Solution
An active energy ray-curable adhesive composition comprising mono- to tetrafunctional (meth)acrylates with tertiary amino groups, polyol compounds, and polyisocyanate compounds, which are instantly cured by irradiation, forming strong adhesion to films without a highly adhesive layer and facilitating urethane formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate adhesive containing polyisocyanate component and polyol component with organic solvents is used, then excellent solvent resistance and adhesion are obtained, but a large amount of energy is required for drying and exhaust treatment, and environmental load increases
Solution Approach 1:
The patent removes organic solvents from the adhesive composition entirely, using a solvent-free system based on polyisocyanate, polyol, and acrylic components. This extraction of the harmful solvent element maintains the core adhesive functionality while eliminating the need for energy-intensive drying and exhaust treatment processes.
Solution Approach 2:
The invention changes the fundamental parameter of the adhesive system from solvent-based to solvent-free. By reformulating the adhesive composition to rely on the reactive components (polyisocyanate, polyol, and acrylic monomer/oligomer) without organic solvents, the patent eliminates the drying energy requirement while maintaining or improving adhesive performance.
2Adaptability or versatility
If active energy ray-curable adhesive composition is used without highly adhesive layer films, then versatility improves, but adhesion to films without highly adhesive layer is insufficient
Solution Approach 1:
The patent creates a composite adhesive system combining three key components: polyisocyanate (for urethane bond formation), polyol (for urethane backbone), and acrylic monomer/oligomer (for active energy ray curability and additional adhesion). This composite material approach enables the adhesive to achieve both versatility across different film types and reliable adhesion performance.
Solution Approach 2:
The adhesive composition is designed to perform multiple functions simultaneously: it provides immediate adhesion through the acrylic component's active energy ray curability, forms durable urethane bonds through the polyisocyanate-polyol reaction, and maintains versatility across different film substrates. The synergistic combination of components enables universal application without requiring highly adhesive layer films.
3Reliability
If active energy ray-curable adhesive is applied to films without highly adhesive layer, then immediate adhesion is achieved, but adhesion after aging is insufficient
Solution Approach 1:
The adhesive system performs preliminary action through the acrylic monomer/oligomer component that can be immediately cured by active energy ray irradiation, providing instant adhesion. Subsequently, the polyisocyanate and polyol components undergo urethane formation during aging, strengthening the bond over time. This preliminary curing followed by progressive strengthening resolves the contradiction between immediate and long-term adhesion.
Solution Approach 2:
The adhesive system maintains continuous useful action through a two-stage process: first, the acrylic component provides immediate adhesion upon active energy ray curing; second, the polyisocyanate-polyol urethane formation continues during aging, progressively enhancing the bond strength. This continuous action from immediate to long-term ensures both immediate and durable adhesion performance.
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 achieves immediate and durable adhesion to films without a highly adhesive layer, reduces environmental impact by minimizing solvent use, and accelerates curing through tertiary amino group catalysis.
Implementation Method 1
an active energy ray-curable adhesive including a mono- to tetrafunctional (meth)acrylate (A) having a tertiary amino group, a polyol compound (B), and a polyisocyanate compound (C)... The active energy ray-curable adhesive is instantaneously cured by irradiation with an active energy ray
Implementation Method 2
a mono- to tetrafunctional (meth)acrylate (A) having a tertiary amino group... The (meth)acrylate (A) is cured by irradiation with an active energy ray to form a film, and the tertiary amino group strongly interacts with a polar group such as a hydroxy group
Data Source
AI summary
An object of the present invention is to provide an active energy ray-curable adhesive that is capable of exhibiting adhesion from immediately after active energy ray irradiation thereof to a film that does not have a highly adhesive layer, and also exhibiting sufficient flexibility and adhesion after aging. The present invention provides an active energy ray-curable adhesive including a mono- to tetrafunctional (meth)acrylate (A) having a tertiary amino group, a polyol compound (B), and a polyisocyanate compound (C)