Transparent Adhesive Composition for Display Devices
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Solution Overview
Problem
Existing transparent adhesive layers in display devices, such as those made from urethane acrylate compounds, suffer from weak heat-resistance and adhesion issues under high temperature and humidity conditions, leading to peeling problems and deterioration of optical properties.
Innovation Solution
A transparent adhesive composition comprising a silicon acrylate monomer, silanol compound, and alkoxy silane compound is used, which forms a polymer matrix with improved adhesion and heat-resistance properties, and includes an alkoxy silane moiety to prevent moisture penetration and maintain optical clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a urethane acrylate compound is used to form the transparent adhesive layer, then the adhesion property is improved, but the heat-resistance property deteriorates under high temperature and humidity conditions
Solution Approach 1:
The patent uses a composite adhesive composition containing both urethane acrylate compound (for adhesion) and silicon acrylate compound (for heat-resistance). This composite approach allows the adhesive layer to simultaneously achieve strong adhesion property and excellent heat-resistance property under high temperature and humidity conditions, resolving the contradiction between these two properties.
2Reliability
If a silicon acrylate compound is used to form the transparent adhesive layer, then the heat-resistance property is improved, but the adhesion property deteriorates
Solution Approach 1:
The patent formulates a composite adhesive composition where silicon acrylate compound provides heat-resistance while urethane acrylate compound provides adhesion. The synergistic combination allows the adhesive layer to maintain both excellent heat-resistance property and strong adhesion property, resolving the contradiction between these two properties.
3Temperature
If the transparent adhesive layer is exposed to high temperature and humidity conditions, then the free volume increases causing moisture penetration, but this leads to deterioration of optical, chemical and physical properties
Solution Approach 1:
The composite adhesive composition with specific silicon acrylate and urethane acrylate compounds creates a cross-linked polymer network that reduces free volume and prevents moisture penetration even under high temperature and humidity conditions. This maintains optical clarity and prevents deterioration of optical, chemical and physical properties.
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 provides a transparent adhesive layer with enhanced adhesion strength and heat-resistance, maintaining a haze value less than 1.5 times the initial value after exposure to 50-85°C and 50-85% humidity for over 250 hours, thus preventing peeling and maintaining optical clarity.
Implementation Method 1
a polymerization reaction is performed on the silicon acrylate monomer
Implementation Method 2
an alkoxy silane moiety, thereby the hydrophobic network structure is formed
Data Source
AI summary
There is further provided a transparent adhesive composition including a silicon acrylate monomer; a silanol compound; an alkoxy silane compound; and an optical initiator.