Acryl-Thiol Adhesive Composition for Touch Panel Durability
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Solution Overview
Problem
Pressure-sensitive adhesive compositions for touch panels face challenges in maintaining adhesive strength and preventing resistance changes and bubble formation when used with conductive films, especially under severe temperature and humidity conditions, due to out-gassing from plastic substrates and direct contact with conductive layers.
Innovation Solution
A pressure-sensitive adhesive composition comprising an acryl polymer and a thiol compound, where the acryl polymer includes (meth)acrylic acid ester monomers and crosslinkable functional groups, and the thiol compound forms a protective layer to inhibit resistance changes and out-gassing, ensuring stable adhesion and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure-sensitive adhesive is used to attach the conductive film to an adherent, then adhesion is achieved, but resistance change occurs in the conductive layer under severe conditions
Solution Approach 1:
A release film is introduced as an intermediary layer between the pressure-sensitive adhesive and the conductive layer. This release film prevents direct contact between the adhesive and the conductive layer, thereby preventing resistance change in the conductive layer while maintaining adhesion functionality. The release film acts as a mediator that separates the adhesive from the conductive layer during the bonding process.
2Strength
If the pressure-sensitive adhesive is in contact with the plastic substrate, then adhesion is achieved, but bubble formation occurs due to out-gassing
Solution Approach 1:
A release film is introduced as an intermediary layer between the pressure-sensitive adhesive and the plastic substrate. This release film prevents direct contact between the adhesive and the substrate, thereby preventing bubble formation caused by out-gassing from the substrate while maintaining adhesion functionality. The release film acts as a barrier that blocks harmful gases from reaching the adhesive layer.
3Illumination intensity
If the pressure-sensitive adhesive maintains transparency under severe conditions, then optical properties are preserved, but adhesive strength may be compromised
Solution Approach 1:
The pressure-sensitive adhesive is formulated as a composite material containing a specific polymer matrix combined with functional additives. This composite structure maintains transparency under severe conditions while preserving adhesive strength through the synergistic combination of materials that resist degradation and maintain bonding performance.
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 composition effectively maintains initial adhesive strength, durability, and prevents resistance changes and bubble formation, ensuring stable operation of touch panels under severe conditions.
Implementation Method 1
the thiol compound forms a protective layer to inhibit resistance changes and out-gassing
Implementation Method 2
Pressure-sensitive adhesive composition for touch panel includes an acryl polymer and a thiol compound
Data Source
Figure 1~4
Figure 5~6
AI summary
Provided are a pressure-sensitive adhesive composition for a touch panel, a conductive film, a touch panel and a pressure-sensitive adhesive film. The exemplary pressure-sensitive adhesive composition for a touch panel, the conductive film or the pressure-sensitive adhesive film has excellent durability and optical properties such as transparency. In addition, such physical properties are stably maintained under severe conditions. Particularly, a pressure-sensitive adhesive layer is attached to a conductor thin film, and thus resistance change of the conductor thin film is effectively inhibited even when the conductor thin film is exposed to the severe conditions. Therefore, the pressure-sensitive adhesive composition may be effectively used to manufacture a touch panel.