Electroconductive Paste for Wearable Circuits
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Solution Overview
Problem
Existing electroconductive pastes for wearable devices lack expansion and contraction durability and require multiple layers for circuit formation, which complicates the manufacturing process and printability, especially when used in clothing that expands and contracts with the body.
Innovation Solution
An electroconductive paste comprising a binder, silver powder, crosslinked resin particles with a glass transition temperature of 35° C. or lower, and an organic solvent, which allows for single-layer circuit formation with excellent expansion and contraction durability through screen printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an aqueous dispersion is used in the electroconductive paste, then the paste can be applied, but the printability in screen printing deteriorates compared to organic solvent-based paste
Solution Approach 1:
The patent changes the solvent parameter from aqueous to organic solvent, which fundamentally alters the paste's rheological properties and compatibility with screen printing processes, thereby improving printability while maintaining ease of manufacture
Solution Approach 2:
The patent creates a composite paste formulation combining organic solvent with specific binder resins and conductive particles, optimizing the material composition to achieve both ease of manufacture and superior printability characteristics
2Reliability
If multiple layers are formed using the electroconductive paste, then circuit functionality can be achieved, but the number of circuit forming steps increases
Solution Approach 1:
The patent merges multiple functional layers into a single integrated electroconductive paste formulation, combining conductive particles, binder resins, and flexible agents in one material system that can form complete circuit patterns in a single printing step, thereby reducing the number of circuit forming steps while maintaining circuit functionality
Solution Approach 2:
The electroconductive paste is designed with multi-functionality, serving simultaneously as the conductive layer, flexible layer, and adhesive layer, eliminating the need for separate application steps for each function and simplifying the overall circuit forming process
3Adaptability or versatility
If the electroconductive paste is used in wearable devices that expand and contract, then the device can conform to body movement, but the electric resistance increases after repeated expansion and contraction
Solution Approach 1:
The patent changes the glass transition temperature parameter of the binder resin to 35°C or lower, which fundamentally alters the material's mechanical properties, enabling it to remain flexible and maintain low electric resistance even after repeated expansion and contraction cycles
Solution Approach 2:
The patent develops a composite paste formulation incorporating flexible agents and specific binder resins with low glass transition temperature, creating a material system that maintains both adaptability to body movement and stability of electric resistance under dynamic conditions
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 paste maintains high conductivity and flexibility, preventing significant increases in electric resistance even after repeated expansion and contraction, thus enhancing the durability and performance of wearable device circuits.
Implementation Method 1
crosslinked resin particles (C) having a glass transition temperature of 35° C. or lower
Data Source
AI summary
An electroconductive paste according to the present invention contains a binder (A), a silver powder (B), crosslinked resin particles (C) having a glass transition temperature of 35° C. or lower, and an organic solvent (D).