Optical Laminate Adhesive High-Temperature Foaming Prevention
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Solution Overview
Problem
Optical films and pressure-sensitive adhesives used in display devices, particularly in high-temperature applications, face challenges in maintaining reliability and preventing foaming and corrosion, especially when exposed to ultra-high temperatures.
Innovation Solution
An optical laminate comprising an optical film with a pressure-sensitive adhesive layer containing specific monomer units and a crosslinked polymer structure, which includes an alkyl (meth)acrylate unit, aromatic group-containing monomer, and polar group-containing monomer, ensuring a high gel fraction and storage elastic modulus, thereby providing durability and preventing foaming and corrosion at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used, then ease of manufacture is maintained, but reliability deteriorates at high temperatures causing foaming and corrosion
Solution Approach 1:
The pressure-sensitive adhesive uses a composite polymer system comprising multiple specific monomer units (alkyl (meth)acrylate with 4+ carbon atoms, alkyl (meth)acrylate with 3 or fewer carbon atoms, aromatic group-containing monomer, and polar group-containing monomer) to achieve synergistic effects that provide both high-temperature reliability and manufacturability
Solution Approach 2:
The adhesive formulation precisely controls the gel fraction within 60-90 wt% and storage elastic modulus within 0.05-0.20 MPa by adjusting monomer ratios and crosslinking conditions, optimizing the balance between adhesion performance and thermal stability without excessive formulation complexity
2Strength
If the pressure-sensitive adhesive layer is made thicker to improve adhesion, then adhesion strength increases, but foaming resistance deteriorates at high temperatures
Solution Approach 1:
The adhesive layer thickness is precisely controlled within 1-10 μm, and the gel fraction is optimized to 60-90 wt%, creating a thin yet highly crosslinked adhesive layer that provides sufficient adhesion strength while preventing foaming through dense crosslinking structure that resists thermal degradation
Solution Approach 2:
The multi-component monomer system creates a composite adhesive matrix with enhanced thermal stability and adhesion, where the combination of flexible alkyl (meth)acrylate units and rigid aromatic group-containing units provides both bonding strength and resistance to thermal foaming
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 optical laminate maintains stability and durability at ultra-high temperatures, prevents foaming and corrosion, and ensures excellent adhesion without causing white turbidity or electrode corrosion, enhancing the performance of display devices.
Implementation Method 1
a crosslinked polymer structure, which includes an alkyl (meth)acrylate unit, aromatic group-containing monomer, and polar group-containing monomer
Implementation Method 2
a pressure-sensitive adhesive layer formed on one side or both sides of the optical film
Data Source
AI summary
An optical laminate is provided where stable durability is secured even at a high temperature, particularly an ultra-high temperature of about 100° C. or higher, no white turbidity is caused, other physical properties required for the optical laminate are also excellent, and even in the case of being disposed adjacent to the electrode, corrosion of the relevant electrode or the like is not induced.