Active Energy Ray-Curable Adhesive for Flexible Film Laminates
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Solution Overview
Problem
Existing laminated films using active energy ray-curable adhesives lack flexibility and versatility, and conventional adhesives with polyisocyanate components have high environmental impact due to solvent use and require extensive energy for drying.
Innovation Solution
An active energy ray-curable adhesive composition comprising a conjugated diene polymer, polyfunctional (meth)acrylate, polyol compound, and polyisocyanate compound, which are solvent-free and curable with active energy rays, allowing for flexible laminates without an easy adhesion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive for laminate containing polyisocyanate component and polyol component is used, then excellent solvent resistance is achieved, but large amount of organic solvent is required and extensive energy is needed for drying
Solution Approach 1:
The invention transitions from solvent-based adhesive to solvent-free adhesive composition. The adhesive composition cures through active energy ray irradiation (UV or electron beam) to form a crosslinked network, eliminating the need for solvent evaporation and associated drying energy while maintaining excellent solvent resistance of the cured film.
Solution Approach 2:
The invention replaces the thermal drying process (mechanical/thermal system) with active energy ray curing (photochemical/radiation system). The adhesive composition contains (meth)acrylate groups that undergo rapid polymerization upon irradiation, substituting the energy-intensive solvent evaporation process with a more efficient curing mechanism.
2Object-generated harmful factors
If active energy ray-curable adhesive including aromatic acrylate ester monomer and resin is used, then environmental load is reduced, but cured film lacks flexibility
Solution Approach 1:
The invention creates a composite adhesive system combining multiple components: (meth)acrylate-modified conjugated diene polymer (provides flexibility and curability), polyol compound (provides flexibility and adhesion), and polyisocyanate compound (provides crosslinking and strength). This composite formulation achieves both flexibility and reduced environmental load without relying on aromatic acrylate ester monomers.
Solution Approach 2:
The invention changes the chemical composition parameters by using aliphatic or alicyclic (meth)acrylate groups instead of aromatic acrylate ester monomers, and by incorporating flexible polyol compounds. These parameter changes maintain curability while improving flexibility and reducing environmental impact.
3Loss of substance
If active energy ray-curable adhesive is used, then solvent-free formulation is achieved, but adhesion to film without easy adhesion layer is insufficient
Solution Approach 1:
The invention provides different functional characteristics to different components: the (meth)acrylate-modified conjugated diene polymer provides curability and flexibility, the polyol compound provides adhesion to difficult substrates through its hydroxyl groups, and the polyisocyanate compound provides crosslinking. This local functional differentiation enables adhesion to films without easy adhesion layers while maintaining solvent-free formulation.
Solution Approach 2:
The polyol compound acts as an intermediary that enhances adhesion to difficult substrates. Its hydroxyl groups can form hydrogen bonds and interact with polar surfaces, while the polyisocyanate compound forms crosslinks to create strong bonding. This intermediary mechanism enables sufficient adhesion without requiring solvent-based formulations.
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 provides flexible, curable films with excellent adhesion to various substrates, reducing environmental impact and eliminating the need for solvent drying, while maintaining high adhesion and optical properties.
Implementation Method 1
active energy ray-curable adhesive composition
Implementation Method 2
irradiating the laminated film with an active energy ray
Data Source
AI summary
An object of the present invention is to provide an active energy ray-curable adhesive composition having a low environmental load that has excellent curability, provides a cured film having flexibility, and can exhibit sufficient adhesion even to a film without having an easy adhesion layer, and a laminate suitable as a packaging material. The present invention proposes an active energy ray-curable adhesive composition including: a conjugated diene polymer (A) which is liquid at 25°C and 1 atm; a polyfunctional (meth)acrylate (B); a polyol compound (C); and a polyisocyanate compound (D), and a laminate using the composition, and applications for packaging materials.