Conductive Laminate Adhesive for Touch Panel Durability
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Solution Overview
Problem
Conductive laminates for touch panels face challenges in maintaining optical transparency and durability under high temperature and humidity conditions, particularly in preventing lift-off and peeling at the pressure-sensitive adhesive interface, which affects the stability and longevity of touch screens.
Innovation Solution
A conductive laminate is developed with a substrate layer and a pressure-sensitive adhesive layer formed from a composition including a thiol compound-based polymerized product, which provides enhanced peeling strength and prevents resistance changes in the conductive layer, ensuring durability and preventing bubbling and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure-sensitive adhesive is used to bond the conductive layer, then the touch panel can be assembled, but the adhesive interface suffers from lift-off and peeling under high temperature and humidity conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the pressure-sensitive adhesive by incorporating specific functional groups (carboxyl, hydroxyl, amine groups) and controlling the glass transition temperature range (-50°C to 0°C) to achieve optimal adhesive performance and resistance to peeling under high temperature and humidity conditions
Solution Approach 2:
The patent creates a composite pressure-sensitive adhesive system by combining polymers with specific functional groups (carboxyl, hydroxyl, amine) in controlled ratios, forming a multi-component adhesive composition that provides both strong bonding and durability under severe environmental conditions
2Device complexity
If the pressure-sensitive adhesive is directly attached to the conductive layer, then the structure is simplified, but resistance change occurs in the conductive layer affecting touch panel stability
Solution Approach 1:
The patent controls the glass transition temperature parameter of the pressure-sensitive adhesive within a specific range (-50°C to 0°C) and adjusts the functional group content to prevent resistance change in the conductive layer while maintaining direct attachment structure
Solution Approach 2:
The patent introduces functional groups (carboxyl, hydroxyl, amine) as chemical intermediaries between the pressure-sensitive adhesive and the conductive layer to prevent adverse interactions that cause resistance change, while maintaining the simplicity of direct attachment
3Strength
If the peeling strength of the pressure-sensitive adhesive is increased, then durability and bubbling prevention are improved, but the adhesive composition becomes more complex
Solution Approach 1:
The patent achieves high peeling strength (2,000 gf/25 mm or more) by optimizing parameters within the adhesive composition, specifically controlling the glass transition temperature range and functional group content, rather than adding complex multi-component systems
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 laminate effectively maintains the durability and stability of touch panels by enhancing peeling strength and preventing resistance changes, ensuring long-term performance and reliability of touch screens.
Implementation Method 1
a pressure-sensitive adhesive layer formed on one or both surfaces of the substrate layer. The pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition including 100 parts by weight of a pressure-sensitive adhesive polymer and 0.1 to 35 parts by weight of a polymerized product of a monomer mixture including a thiol compound
Implementation Method 2
Such a pressure-sensitive adhesive is required to maintain optical transparency under severe conditions such as a high temperature or high temperature and high humidity condition
Implementation Method 3
when the pressure-sensitive adhesive stably inhibits a resistance change of the conductive layer, a touch panel or screen may be stably driven for a long time
Implementation Method 4
One or both surfaces of the substrate layer may be subject to suitable treatment such as corona discharging treatment, UV radiation treatment, plasma treatment, or sputter etching treatment to enhance cohesiveness
Implementation Method 5
One or both surfaces of the substrate layer may be subject to suitable treatment such as corona discharging treatment, UV radiation treatment, plasma treatment, or sputter etching treatment to enhance cohesiveness
Implementation Method 6
One or both surfaces of the substrate layer may be subject to suitable treatment such as corona discharging treatment, UV radiation treatment, plasma treatment, or sputter etching treatment to enhance cohesiveness
Data Source
AI summary
The present invention is relates to conductive laminate. The conductive laminate is applied to a touch panel or touch screen, thereby exhibiting excellent durability, and a pressure-sensitive adhesive layer included in the conductive laminate may prevent a change in resistance of a conductive layer, and effectively inhibit lift-off or peeling, or generation of bubbles at a pressure-sensitive adhesive interface. As a result, performances of the touch panel or touch screen including the conductive laminate may be stably maintained for a long time.