Polyether Conductive Adhesive with Silver Particles for Flexible Devices

Solution Overview

Problem

Existing electrically conductive adhesives lack the necessary flexibility and thermal resistance to meet the demands of flexible devices that require folding, and they often suffer from high electrical resistance and power loss.

Innovation Solution

A polyether polymer-based electrically conductive adhesive is developed, which includes silver particles that can sinter at low temperatures due to oxygen permeability and decomposition, enhancing electrical conductivity and flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If epoxy resin is used as the binder, then adhesion and heat resistance are improved, but flexibility deteriorates

Engineering Contradiction:

Improveadhesion and heat resistanceVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses a composite binder system combining polyimide resin and silicone resin. The polyimide resin provides adhesion and heat resistance, while the silicone resin contributes flexibility. This composite approach allows the adhesive to simultaneously achieve both reliability and adaptability that neither resin could provide alone.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If polyimide resin is used as the binder, then flexibility is improved, but heat resistance deteriorates

Engineering Contradiction:

ImproveflexibilityVSAvoidheat resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses a composite binder system combining polyimide resin and silicone resin. The polyimide resin provides adhesion and heat resistance, while the silicone resin contributes flexibility. This composite approach allows the adhesive to simultaneously achieve both reliability and adaptability that neither resin could provide alone.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If polyurethane resin is used as the binder, then flexibility is improved, but heat resistance deteriorates

Engineering Contradiction:

ImproveflexibilityVSAvoidheat resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent uses a composite binder system combining polyimide resin and silicone resin. The polyimide resin provides adhesion and heat resistance, while the silicone resin contributes flexibility. This composite approach allows the adhesive to simultaneously achieve both reliability and adaptability that neither resin could provide alone.

Inventive Principle:

Principle #40Composite materials

4Adaptability or versatility

If silicone-based electrically conductive adhesive is used, then flexibility is improved, but electrical conductivity deteriorates

Engineering Contradiction:

ImproveflexibilityVSAvoidelectrical conductivity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent optimizes the content of electrically conductive filler (silver powder) to 60-80 wt% of the total adhesive composition. This high filler content compensates for the lower intrinsic conductivity of silicone-based binders, achieving electrical conductivity comparable to metal wiring while maintaining the flexibility benefits of silicone resin.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrically conductive adhesive by combining silicone resin with high proportions of electrically conductive filler (silver powder). This composite structure allows the flexible silicone matrix to provide mechanical flexibility while the conductive filler network provides electrical conductivity.

Inventive Principle:

Principle #40Composite materials

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 achieves high electrical conductivity with good flexibility, low power loss, and excellent thermal stability, making it suitable for use in flexible devices such as backlight modules.

Implementation Method 1

silver particles that can sinter at low temperatures due to oxygen permeability and decomposition

Methodology Applied

Scientific EffectOxygen permeability and decomposition: Permeation

Implementation Method 2

silver particles that can sinter at low temperatures

Methodology Applied

Scientific EffectSintering: Sintering

Implementation Method 3

high electrical conductivity with good flexibility, low power loss

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentEP3299430B1Electrically conductive adhesive and electrically conductive material

Publication Date: 2025.05.28 NICHIA CORP

AI summary

Disclosed is an electrically conductive adhesive containing: (A) a polyether polymer having a backbone comprising a repeating unit of the formula: -R1-O- wherein R1 is a hydrocarbon group having 1 to 10 carbon atoms, and an end group which is a hydrolyzable silyl group, and (B) silver particles. Further disclosed is an electrically conductive material which is a hardened product of the electrically conductive adhesive.