Polyester Conductive Paste for Stretchable Interconnect Reliability
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Solution Overview
Problem
Existing conductive pastes are not suitable for forming flexible conductive layers or interconnections at low temperatures without cracking or significant loss of electrical continuity, and they lack the necessary flexibility and environmental resistance for applications in capacitive touch technologies and stretchable electronic surfaces.
Innovation Solution
A conductive paste comprising conductive particles dispersed in an organic medium, where the organic medium includes a solvent and a binder comprising a polyester, allowing the paste to form a conductive coating or interconnection that can be stretched up to 150% without cracking and maintaining excellent electrical continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive paste is used, then electrical conductivity is achieved, but the conductive layer cracks when stretched and loses electrical continuity
Solution Approach 1:
The patent employs a polyester binder to create a flexible matrix that envelops conductive particles, forming a thin film conductive layer that can stretch without cracking. The polyester polymer structure provides the necessary flexibility and elasticity to maintain electrical continuity during deformation, directly resolving the contradiction between electrical reliability and mechanical flexibility.
Solution Approach 2:
The invention creates a composite material system combining conductive particles (such as silver, copper, or carbon) dispersed in a polyester binder matrix. This composite structure allows the conductive phase to maintain electrical pathways while the polyester matrix provides flexibility and stretchability, enabling both electrical continuity and mechanical flexibility simultaneously.
2Reliability
If conventional conductive paste is used, then conductivity is achieved, but the paste forms gel or cracks after long storage time
Solution Approach 1:
The patent modifies the chemical composition parameters by using polyester as the binder instead of conventional epoxy or other polymers. This parameter change in the binder chemistry provides superior storage stability, preventing gel formation and maintaining paste consistency over extended storage periods while preserving electrical conductivity after application.
Solution Approach 2:
The polyester binder system is designed to be stable during storage but can be processed and cured efficiently, creating a durable conductive layer. The binder formulation ensures the paste remains stable during its service life (storage and application) without requiring excessive longevity, balancing storage stability with processing efficiency.
3Reliability
If conventional conductive paste is used, then conductive layer is formed, but high temperature sintering damages the substrate
Solution Approach 1:
The patent replaces the traditional thermal sintering mechanism with a polyester binder-based curing process. Instead of relying on high-temperature sintering to fuse conductive particles, the polyester binder provides adhesion and structural integrity at lower temperatures, eliminating the need for high-temperature processing that would damage temperature-sensitive substrates.
Solution Approach 2:
The invention changes the processing temperature parameter from high-temperature sintering (typically above 800°C for conventional pastes) to low-temperature polyester curing (typically below 200°C). This parameter change in processing temperature enables formation of conductive layers on heat-sensitive substrates without damage, while still achieving adequate electrical conductivity.
4Reliability
If conventional conductive paste is used, then conductive interconnection is formed, but the paste lacks flexibility for stretchable electronics
Solution Approach 1:
The patent uses polyester binder to create a flexible thin film matrix that allows the conductive interconnection to stretch and deform without cracking. The polyester polymer structure inherently provides flexibility and elasticity, enabling the conductive layer to adapt to stretching and bending applications in stretchable electronics while maintaining electrical continuity.
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 conductive paste achieves excellent mechanical robustness and electronic performance, enabling the formation of stretchable conductive layers suitable for capacitive touch technologies and flexible electronic surfaces, with improved adhesion, flexibility, and resistance to environmental factors.
Implementation Method 1
a binder comprising a polyester
Data Source
AI summary
A conductive paste and method of manufacturing thereof. The conductive paste comprises conductive particles dispersed in an organic medium, the organic medium comprising: (a) a solvent; and (b) a binder comprising a polyester. The conductive paste typically comprises silver and may contain various other additives. A stretchable conductive layer can be formed by curing the conductive paste.