Conductive Adhesive Metal Precursor Nanoparticle Formation
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Solution Overview
Problem
Existing electrically conductive adhesives face challenges with high processing viscosities, low storage stabilities, insufficient electrical conductivity, and an inadequate balance of filler loading, adhesive strength, curing speed, and stable electrical contact resistance, particularly for small contact areas in electronic devices.
Innovation Solution
A thermally curable adhesive comprising a thermosetting resin, electrically conductive particles with an average size of 1 μm to 50 μm, and a metal precursor that decomposes to form metallic nanoparticles during curing, achieving low processing viscosity and stable electrical conductivity with a low and long-term stable electrical contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically conductive fillers are added to polymer resin to create electrically conductive adhesives, then electrical conductivity is improved, but processing viscosity increases
Solution Approach 1:
The patent changes the physical state of metal particles from micron-sized to nanosized, which fundamentally alters their flow characteristics and packing behavior. This parameter change enables high filler loading (improving conductivity) while maintaining low processing viscosity, as nanoparticles can move more freely and form conductive networks at lower concentrations.
Solution Approach 2:
The patent creates a composite material system combining polymer resin with nanosized metal particles and coupling agents. This composite approach allows the synergistic interaction between components, where the coupling agent mediates between the nanoparticle filler and polymer matrix, enabling both high conductivity and low viscosity simultaneously.
2Reliability
If high filler loading is used to improve electrical conductivity, then electrical conductivity is improved, but adhesive strength decreases
Solution Approach 1:
The patent employs a composite formulation where coupling agents (silane or titanate) are introduced as intermediary components between the metal filler and polymer resin. These coupling agents chemically bond to both the metal particle surface and the polymer matrix, creating a tri-component composite system that maintains adhesive strength even at high filler loadings by preventing filler aggregation and ensuring uniform stress distribution.
Solution Approach 2:
The coupling agent serves as an intermediary substance that mediates the interaction between metal filler particles and the polymer resin. By forming chemical bridges between these two components, the coupling agent ensures that high filler loading does not compromise the adhesive bonding, as the intermediary maintains interfacial adhesion and prevents filler particle aggregation.
3Productivity
If rapid curing is implemented to improve productivity, then curing speed is improved, but electrical contact resistance stability deteriorates
Solution Approach 1:
The patent utilizes nanosized metal particles with fundamentally different thermal and electrical properties compared to micron-sized particles. The high surface-area-to-volume ratio of nanoparticles enables rapid heat transfer and uniform temperature distribution during curing, allowing fast curing rates while maintaining stable electrical contact resistance through uniform metallurgical bonding across the entire adhesive joint.
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 provides a stable electrically conductive interconnection with low contact resistance and high conductivity, suitable for small contact areas, and can be cured within 0.1 to 180 minutes at temperatures between 50°C to 250°C, offering improved mechanical strength and thermal stability.
Implementation Method 1
at least one metal precursor, wherein the metal precursor decomposes substantially to the corresponding metal during the thermal curing of the thermally curable adhesive
Data Source
AI summary
The present invention relates to thermally curable adhesives that are suitable for use as electrically conductive materials in the fabrication of electronic devices, integrated circuits, semiconductor devices, passive components, solar cells, solar modules, and/or light emitting diodes. The thermally curable adhesives comprise at least one thermosetting resin, electrically conductive particles having an average particle size of 1 μm to 50 μm, and at least one metal precursor, wherein the metal precursor decomposes substantially to the corresponding metal during the thermal curing of the thermally curable adhesive.