Conductive Adhesive Loss Modulus Control for Flexible Wiring
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Solution Overview
Problem
Conductive adhesives for flexible printed wiring boards face challenges in balancing filling performance and adhesiveness, with existing compositions not adequately addressing both requirements simultaneously.
Innovation Solution
A conductive adhesive comprising a thermosetting resin and a conductive filler, with a specific loss modulus range of 5.0×10^4 Pa to 4.0×10^5 Pa at 200° C., which includes a loss modulus modifier to optimize filling performance and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the composition of the conductive adhesive is changed to improve adhesiveness, then adhesiveness is improved, but filling performance deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the loss modulus within a specific range (5.0×10^4 Pa to 4.0×10^5 Pa at 200°C) to simultaneously achieve both adhesiveness and filling performance. This quantitative parameter control allows the adhesive to maintain optimal viscoelastic properties for both bonding and flow into openings.
Solution Approach 2:
The patent uses composite materials by combining thermosetting resin with conductive filler and loss modulus modifier in specific proportions. This composite formulation enables the adhesive to exhibit multiple functions: bonding strength from the resin, conductivity from the filler, and controlled flow characteristics from the modifier.
2Manufacturing precision
If the composition of the conductive adhesive is changed to improve filling performance, then filling performance is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing a specific loss modulus range (5.0×10^4 Pa to 4.0×10^5 Pa at 200°C) that balances flowability for filling with adhesion for bonding. This parameter optimization ensures that improving one property does not sacrifice the other.
Solution Approach 2:
The composite formulation combining thermosetting resin, conductive filler, and loss modulus modifier creates a material that simultaneously achieves filling performance and adhesiveness through synergistic interactions among components.
3Strength
If the loss modulus is increased to improve adhesiveness, then adhesiveness is improved, but filling performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the loss modulus within a specific range rather than maximizing it. This controlled parameter approach allows the adhesive to have sufficient strength for bonding while maintaining enough flexibility to flow into and fill openings effectively.
4Manufacturing precision
If the loss modulus is decreased to improve filling performance, then filling performance is improved, but adhesiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing a lower bound for the loss modulus (5.0×10^4 Pa at 200°C). This minimum threshold ensures that the adhesive maintains sufficient internal strength and adhesion capability while allowing enough flow to achieve good filling performance in small openings.
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 maintains sufficient elasticity and adhesiveness, ensuring reliable connection and stability even at high temperatures, effectively filling small openings and maintaining low interconnect resistance.
Implementation Method 1
a thermosetting resin (A) and a conductive filler (B), wherein the conductive adhesive has a loss modulus at 200° C. from 5.0×104 Pa to 4.0×105 Pa
Implementation Method 2
a conductive filler (B)... maintaining low interconnect resistance
Implementation Method 3
the conductive adhesive may contain from 40 to 140 parts by mass of the loss modulus modifier (C) relative to 100 parts by mass of the thermosetting resin (A)
Data Source
AI summary
The conductive adhesive includes a thermosetting resin (A) and a conductive filler (B), and has a loss modulus at 200° C. from 5.0×104 Pa to 4.0×105 Pa.