Acrylic Adhesive Composition for Touch Panel Bubble Prevention
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Solution Overview
Problem
Pressure-sensitive adhesives used in touch panels face challenges such as out-gassing from plastic substrates, leading to bubble formation and resistance changes in conductive layers, especially under severe conditions like high temperature and humidity, which affect the durability and visibility of the touch panel.
Innovation Solution
A pressure-sensitive adhesive composition incorporating an acryl polymer with (meth)acrylic acid ester monomers and a thiol compound, along with a multifunctional crosslinking agent, is used to form a cured layer directly attached to the conductive layer, enhancing cohesive strength and preventing resistance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure-sensitive adhesive is used to attach the conductive film to an adherent, then the conductive film can be securely mounted, but bubbles may form due to out-gassing from the plastic substrate under heating conditions
Solution Approach 1:
The patent introduces a specifically designed pressure-sensitive adhesive layer as an intermediary between the plastic substrate and conductive film. This adhesive layer acts as a mediator that prevents out-gassing from reaching the conductive film while maintaining secure attachment. The adhesive composition includes functional groups that interact with both the substrate and conductive film, creating a protective barrier against bubble formation.
Solution Approach 2:
The pressure-sensitive adhesive is formulated as a composite material containing multiple functional components: base adhesive polymers, out-gassing barrier agents, and coupling agents. This composite structure allows the adhesive to simultaneously provide strong bonding, prevent bubble formation, and ensure electrical stability of the conductive film under severe conditions.
2Strength
If the pressure-sensitive adhesive is directly adhered to the conductive layer, then the adhesive can secure the conductive film, but resistance changes may occur in the conductive layer under severe conditions
Solution Approach 1:
The patent modifies the chemical and physical parameters of the pressure-sensitive adhesive to optimize its interaction with the conductive layer. The adhesive composition is adjusted to include specific functional groups and molecular weights that prevent resistance changes in the conductive film. By controlling parameters such as adhesive thickness, crosslinking density, and chemical composition, the patent achieves both strong bonding and electrical stability under high temperature and humidity conditions.
3Object-generated harmful factors
If the pressure-sensitive adhesive layer is formed to prevent bubble formation, then visibility is maintained, but the adhesive properties and durability must be maintained under severe conditions
Solution Approach 1:
The patent applies different functional properties to different regions or aspects of the pressure-sensitive adhesive layer. The adhesive is designed with local variations in composition and structure: one region provides out-gassing barrier functionality to prevent bubbles, while another region provides strong bonding to secure the conductive film, and a third region ensures electrical stability. This localized functional differentiation allows the adhesive to simultaneously achieve bubble prevention and long-term durability under severe 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 solution effectively maintains the adhesive properties and durability of the pressure-sensitive adhesive layer, preventing bubble formation and resistance changes in the conductive layer, ensuring stable operation of the touch panel under severe conditions.
Implementation Method 1
a thiol compound is bound to the acryl polymer
Implementation Method 2
a pressure-sensitive adhesive composition for a touch panel in a cured state
Data Source
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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.