Acrylic Adhesive Composition for Touch Panel Chemical Resistance
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Solution Overview
Problem
Adhesive compositions for touch panels face challenges in providing excellent chemical resistance, durability under high-temperature or high-humidity conditions, and maintaining adhesion and wettability while preventing corrosion of electrodes.
Innovation Solution
An adhesive composition comprising an acrylic resin and a polyfunctional crosslinking agent, with specific gel content and high temperature shear strength properties, ensuring excellent adhesion and chemical resistance by forming a cured product that adheres well to various surfaces and maintains conductive layer integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pressure adhesive composition containing acrylic polymer and crosslinking agent is used, then adhesion strength is improved, but chemical resistance deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the acrylic polymer to 10^6 or more (weight average molecular weight), which is significantly higher than conventional adhesives. This parameter change results in a gel content of 10-80% after curing, providing optimal balance between adhesion strength and chemical resistance. The high molecular weight reduces the number of chain ends and creates a more densely crosslinked network that resists chemical penetration while maintaining strong bonding.
Solution Approach 2:
The patent creates a composite adhesive system combining acrylic polymer with specific crosslinking agents (isocyanate, epoxy, or carboxylic acid groups). This composite structure forms a crosslinked network that integrates the toughness and adhesion of acrylic polymers with the chemical resistance and strength of the crosslinking agents, achieving both improved adhesion and enhanced chemical resistance simultaneously.
2Object-affected harmful factors
If gel content is increased to improve chemical resistance, then adhesion strength may deteriorate
Solution Approach 1:
The patent optimizes the gel content parameter to a specific range of 10-80% after curing. This controlled gel content ensures sufficient crosslinking density for chemical resistance while preventing excessive crosslinking that would make the adhesive too rigid and brittle. The high molecular weight acrylic polymer (10^6 or more) enables achieving this optimal gel content range with appropriate crosslinking agent amounts, maintaining both chemical resistance and adhesion strength.
3Reliability
If crosslinking agent amount is increased to improve durability, then wettability and adhesion may deteriorate
Solution Approach 1:
The patent optimizes the crosslinking agent amount to 0.01-10 parts by weight per 100 parts by weight of acrylic polymer. This controlled crosslinking agent dosage, combined with the high molecular weight acrylic polymer, achieves optimal balance between durability and wettability. The high molecular weight polymer provides sufficient chain length and flexibility to maintain good wettability even with crosslinking, while the controlled crosslinking agent amount ensures adequate durability without excessive crosslinking density that would harm wettability.
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 composition achieves superior chemical resistance, durability, and adhesion to touch panel surfaces, effectively preventing electrode corrosion and maintaining conductive layer resistance under severe conditions.
Implementation Method 1
an adhesive composition comprising an acrylic resin and a polyfunctional crosslinking agent
Implementation Method 2
excellent adhesion or wettability to various adherends
Implementation Method 3
excellent adhesion or wettability to various adherends
Data Source
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Figure 4~5
AI summary
The present invention relates to an adhesive composition for a touch panel, to an adhesive film, and to a touch panel. The adhesive composition according to the present invention provides an adhesive for a touch panel that has superior chemical resistance, superior durability under high-temperature or high-humidity conditions, and superior wettability or adhesion to a variety of adherends. In addition, the adhesive composition according to the present invention provides an adhesive which maintains superior resistant performance of a conductive layer and effectively prevents the corrosion of electrodes or the like when applied to a touch panel.