UV-Curable Adhesive Composition Oxygen Tolerance
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Solution Overview
Problem
Conventional UV-curable adhesive compositions face challenges with insufficient UV reactivity and adhesion when exposed and not covered with a separator during curing, leading to waste production and air bubbles at the bonding interface.
Innovation Solution
A UV-curable adhesive composition containing a nitrogen-containing monomer, a monofunctional (meth)acrylate monomer, a crosslinking component, and a thermoplastic resin, which, when applied and cured with UV light, achieves high reaction percentages on both surfaces, ensuring excellent UV reactivity and adhesion to various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If UV-curable adhesive composition is exposed and not covered with a separator during curing, then waste production is reduced and air bubbles are prevented, but UV reactivity and adhesion become insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the UV-curable adhesive by incorporating specific components (nitrogen-containing compound, glass fiber, metal powder) that enable the adhesive to maintain high UV reactivity and adhesion even when exposed to atmosphere during curing, thus resolving the contradiction between waste reduction and curing performance
Solution Approach 2:
The patent creates a composite UV-curable adhesive composition combining multiple materials (nitrogen-containing compound, glass fiber, metal powder, photopolymerization initiator) that work synergistically to prevent oxygen inhibition and enhance adhesion, allowing the adhesive to cure effectively without separator coverage
2Loss of substance
If UV-curable adhesive composition is exposed and not covered with a separator during curing, then waste production is reduced and air bubbles are prevented, but adhesion to substrates becomes insufficient
Solution Approach 1:
The patent adjusts the compositional parameters by adding nitrogen-containing compounds and reactive diluents that enhance substrate interaction and adhesion strength, enabling the adhesive to form strong bonds even when cured in an exposed state without separator protection
Solution Approach 2:
The nitrogen-containing compound and glass fiber act as intermediary substances that facilitate strong bonding between the adhesive and substrate, compensating for the lack of separator coverage and ensuring adequate adhesion strength
3Manufacturing precision
If adhesive sheet is cut to desired shape, then printability is improved, but waste production increases
Solution Approach 1:
The patent applies the UV-curable adhesive composition directly in the desired shape and pattern onto the substrate before curing, eliminating the need to pre-cut adhesive sheets. This preliminary direct application achieves the desired printability while preventing waste from cutting operations
Solution Approach 2:
The patent replaces the mechanical cutting process with a direct printing/application method where the UV-curable adhesive is deposited in the exact shape and pattern needed, substituting mechanical fabrication with a more precise and waste-free application process
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 composition exhibits enhanced UV reactivity in the presence of oxygen and excellent adhesion to substrates, reducing waste and air bubbles, and is suitable for printing applications.
Implementation Method 1
irradiating the composition with UV light having a wavelength of 315 nm to 480 nm at an irradiance of 90 mW/cm2 and a dose of 1,350 mJ/cm2 in an atmospheric environment
Data Source
AI summary
The present invention aims to provide a UV-curable adhesive composition having excellent printability, excellent UV reactivity in the presence of oxygen, and excellent adhesion to various substrates. The present invention also aims to provide an adhesive containing the UV-curable adhesive composition. Provided is a UV-curable adhesive composition containing: (A) a nitrogen-containing monomer; (B) a monofunctional (meth)acrylate monomer; (C) a crosslinking component; (D) a photopolymerization initiator; and (E) a thermoplastic resin having no reactivity with the nitrogen-containing monomer (A) nor with the monofunctional (meth)acrylate monomer (B), a cured product being obtained by applying the composition to a substrate at a thickness of 150 μm and irradiating the composition with UV light having a wavelength of 315 nm to 480 nm at an irradiance of 90 mW/cm2 and a dose of 1,350 mJ/cm2 in an atmospheric environment, the cured product having a reaction percentage of 80% or higher on both a surface facing the atmosphere and a surface facing the substrate.