Radical Polymerizable Adhesive Composition for Electrical Connection Body Warpage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in producing electrical connection bodies is the occurrence of warpage and insufficient curing of light-shielding portions due to excessive heating, which results in high conductive resistance and low die shear strength, especially when using thermocompression bonding with curable adhesive compositions.
Innovation Solution
A radical polymerizable adhesive composition containing a radical polymerizable compound, a thermal-radical polymerization initiator, and a photoacid generator, without a cationic polymerizable compound, is used, where the photoacid generator accelerates the thermal-radical polymerization reaction upon light irradiation, allowing for lower curing temperatures and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heating temperature is increased to 130-180°C for sufficient thermal curing, then die shear strength and conductive resistance are improved, but warpage occurs in the electrical connection body
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive system by removing the cationic polymerizable compound while retaining the photoacid generator and thermal-radical polymerization initiator. This parameter change enables the system to achieve sufficient curing at lower temperatures (reducing warpage) while maintaining die shear strength and conductive resistance through optimized radical polymerization chemistry
2Shape
If heating temperature is lowered to about 100°C to prevent warpage, then warpage is reduced, but thermal curing reaction becomes insufficient leading to increased conductive resistance and reduced die shear strength
Solution Approach 1:
The invention extracts the cationic polymerizable compound from the adhesive composition, eliminating the need for high-temperature thermal curing that causes warpage. The remaining components (photoacid generator and thermal-radical polymerization initiator) work synergistically to enable effective curing at lower temperatures, preventing warpage while maintaining mechanical and electrical properties
3Strength
If light-shielding portions are present in electrical components, then die shear strength decreases due to insufficient light irradiation, but adding thermal-radical polymerization initiator and acrylate-based monomer causes warpage at high temperatures
Solution Approach 1:
The invention uses the photoacid generator as an intermediary that, when activated by light irradiation, accelerates the thermal-radical polymerization reaction. This intermediary mechanism allows the system to achieve sufficient curing even in areas with limited light exposure (such as regions with light-shielding portions) while operating at lower temperatures that prevent warpage
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
This approach effectively reduces warpage, maintains low conductive resistance, and enhances die shear strength even with light-shielding portions, by accelerating the thermal-radical polymerization reaction and ensuring sufficient curing at lower temperatures.
Implementation Method 1
the photoacid generator accelerates the thermal-radical polymerization reaction by generating acid upon light irradiation
Implementation Method 2
a thermal-radical polymerization initiator, and a photoacid generator... the radical polymerization reaction of the composition is accelerated
Data Source
AI summary
A radical polymerizable adhesive composition contains a radical polymerizable compound, a thermal-radical polymerization initiator, and a photoacid generator, but contains no cationic polymerizable compound that undergoes cationic polymerization initiated by an acid generated by the photoacid generator. The photoacid generator has the property of accelerating the thermal-radical polymerization reaction of the radical polymerizable adhesive composition. The thermal-radical polymerization initiator is an organic peroxide, and the photoacid generator is a sulfonium salt, an iodonium salt, or an iron-arene complex.