Acrylic Silane Adhesion Layer for Touch Sensor Durability
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Solution Overview
Problem
Current touch and fingerprint sensing devices face challenges in achieving reliable and sensitive performance due to limitations in adhesion strength and durability, particularly in their interaction with organic and inorganic layers.
Innovation Solution
A composition for adhesion comprising an acrylic resin and a silane compound, along with silica nanoparticles, is used to form an adhesion layer that enhances bonding strength and durability, allowing for effective integration with both organic and inorganic layers, and is applied in a stacked structure within electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesion materials are used to bond organic and inorganic layers, then basic adhesion is achieved, but adhesion strength and durability are insufficient
Solution Approach 1:
The patent uses a composite adhesion layer comprising both organic resin (acrylic resin with specific molecular weight 100,000-200,000 g/mol) and inorganic particles (silica nanoparticles with diameter 10-50 nm). This composite structure combines the bonding capability of organic materials with the mechanical reinforcement and heat resistance of inorganic particles, achieving both high adhesion strength and durability while resolving the contradiction between strength and reliability
Solution Approach 2:
The patent optimizes specific parameters including the molecular weight of acrylic resin (100,000-200,000 g/mol), diameter of silica nanoparticles (10-50 nm), and their weight ratios (resin 70-95 wt%, particles 5-30 wt%). These parameter optimizations enhance both adhesion strength and durability simultaneously, resolving the technical contradiction
2Strength
If the adhesion layer is made thicker to improve bonding, then adhesion strength increases, but device size increases
Solution Approach 1:
The patent optimizes the thickness of the adhesion layer to 10-50 nm, which is sufficiently thin to maintain miniaturization while the composite structure (organic resin + inorganic silica particles) provides enhanced bonding strength per unit thickness. This resolves the contradiction by achieving high strength without increasing device volume
Solution Approach 2:
The composite adhesion layer with inorganic silica particles dispersed in organic resin provides high bonding strength at reduced thickness compared to conventional organic-only adhesives, enabling both strong bonding and device miniaturization
3Temperature
If conventional adhesion materials are used, then basic bonding is achieved, but heat resistance is insufficient
Solution Approach 1:
The patent incorporates inorganic silica nanoparticles (diameter 10-50 nm) into the organic acrylic resin matrix. The inorganic particles provide thermal stability and heat resistance while the organic resin maintains adhesion functionality, achieving both high temperature resistance and reliable adhesion performance under thermal and mechanical stress
Solution Approach 2:
The silica nanoparticles act as intermediary reinforcement particles that bridge the organic and inorganic layers, providing thermal pathways and mechanical reinforcement that enhance heat resistance while maintaining adhesion reliability under various stress 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 adhesion layer demonstrates improved bonding strength and heat resistance, effectively absorbing external stress and enhancing the sensitivity and reliability of touch and fingerprint sensing devices by securely fixing inorganic layers to organic layers, thereby improving device performance and durability.
Implementation Method 1
a silane compound having a weight average molecular weight of about 300 g/mol to about 2,000 g/mol and including a polymerization unit derived from a monomer represented by Formula B
Implementation Method 2
an acrylic resin having a weight average molecular weight of about 100,000 g/mol to about 200,000 g/mol and including a polymerization unit derived from a monomer represented by Formula A1 and a polymerization unit derived from a monomer represented by Formula A2
Implementation Method 3
The adhesion layer demonstrates improved bonding strength and heat resistance, effectively absorbing external stress
Data Source
AI summary
Provided are a composition for adhesion, a stacked structure including the same, and an electronic device including the same. The composition for adhesion may include an acrylic resin and a silane compound. The acrylic resin may have a weight average molecular weight of about 100,000 g/mol to about 200,000 g/mol, and may include a polymerization unit derived from a monomer represented by Formula A1 and a polymerization unit derived from a monomer represented by Formula A2. The silane compound may have a weight average molecular weight of about 300 g/mol to about 2,000 g/mol, and a polymerization unit derived from a monomer represented by Formula B.