UV-Curable Composition Oxygen Tolerance
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Solution Overview
Problem
Existing UV-curable compositions face challenges with insufficient UV reactivity and adhesiveness when exposed and not covered, leading to issues with waste production and air bubbles in bonding interfaces during the printing of electronic components.
Innovation Solution
A UV-curable composition containing a (meth)acrylate monomer and a crosslinking component, with specific ratios and properties that enhance UV reactivity and adhesiveness, including a glass transition temperature range of −70° C. to −30° C. for the monomer and a reaction percentage of 83% or higher, ensuring effective curing and bonding at room and high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If an adhesive sheet is produced and cut to desired shape, then the adhesive can be bonded to adherends, but part of the adhesive sheet is discarded producing waste and air bubbles may be trapped at the bonding interface
Solution Approach 1:
The invention extracts only the necessary adhesive portion by printing it in a predetermined shape directly onto the adherend, eliminating the need to produce and cut adhesive sheets. This extraction approach removes waste while simplifying the bonding process by directly applying adhesive only where needed.
Solution Approach 2:
The adhesive is copied in a predetermined shape through printing technology directly onto the adherend surface. This copying method allows precise placement of adhesive in the required pattern, eliminating waste from unused adhesive material and preventing air bubbles by ensuring complete coverage without separators.
2Temperature
If UV light is used to cure the adhesive composition, then heating of adherends is avoided, but insufficient UV reactivity and insufficient adhesion to substrates occurs when exposed and not covered with separator
Solution Approach 1:
The invention changes the chemical parameters of the adhesive composition by incorporating specific compounds (nitrogen-containing monomer, silane-modified polymer, phosphine oxide compound) that enhance UV reactivity. This allows the adhesive to achieve sufficient curing even when exposed to air during printing, maintaining both low temperature processing and high reliability of bonding.
Solution Approach 2:
The adhesive composition is formulated as a composite material containing multiple functional components: (meth)acrylate monomer, nitrogen-containing monomer, silane-modified polymer, phosphine oxide compound, and photopolymerization initiator. This composite formulation provides both UV curability and enhanced adhesion to various substrates, resolving the reliability issue while maintaining temperature control.
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 achieves excellent printability, UV reactivity in the presence of oxygen, and adhesiveness at both room and high temperatures, reducing waste and preventing air bubbles in bonding interfaces.
Implementation Method 1
a UV-curable composition containing: a curing component containing a (meth)acrylate monomer and a crosslinking component; and a UV curing agent
Data Source
AI summary
The present invention aims to provide a UV-curable composition having excellent printability, excellent UV reactivity in the presence of oxygen, and excellent adhesiveness at room temperature and high temperature. Provided is a UV-curable composition containing: a curing component containing a (meth)acrylate monomer and a crosslinking component; and a UV curing agent, the (meth)acrylate monomer including, in 100% by weight of the curing component, 50 to 85% by weight of a monomer that, in a form of a homopolymer, has a glass transition temperature of −70° C. to −30° C., a cured product being obtained by applying the composition to a substrate at a thickness of 150 μm and irradiating the composition, without sealing an upper surface of the applied 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 gel fraction of 0.4 to 78%, a glass transition temperature of −35° C. to 10° C., a reaction percentage of 83% or higher, and a reaction progress percentage on a surface facing the atmosphere of 93% or higher relative to a surface facing the substrate.