Adhesive Composition for Optical Members with Low Temperature Stability
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Solution Overview
Problem
Conventional adhesive layers for optical members in flat panel displays face issues with low temperature stability and leakage of ionic liquids, which can cause deterioration of optical and metal elements, and fail to effectively manage electrostatic discharge.
Innovation Solution
An adhesive composition incorporating an antistatic agent with a melting point of at least 50°C and a base polymer with a glass transition temperature of not more than 0°C, cross-linked using a suitable agent, to form an adhesive layer with improved stability and antistatic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an ionic liquid is added to the adhesive layer to provide antistatic properties, then the surface resistance is reduced, but the adhesive layer loses low temperature stability and the ionic liquid leaks out
Solution Approach 1:
The patent changes the physical state parameter of the antistatic agent by selecting ionic compounds with melting points of not less than 50°C, transforming them from liquid to solid state. This parameter change prevents leakage while maintaining antistatic functionality, as the solid state provides structural stability at low temperatures.
Solution Approach 2:
The patent creates a composite adhesive layer combining a base polymer with solid ionic compounds. This composite structure integrates the adhesive properties of the polymer with the antistatic properties of the ionic compound, while the solid state of the ionic compound prevents phase separation and leakage that would occur with liquid ionic liquids.
2Object-affected harmful factors
If an ionic liquid is added to the adhesive layer to provide antistatic properties, then the surface resistance is reduced, but the ionic liquid causes deterioration of optical members or metal elements
Solution Approach 1:
The patent changes the physical state parameter of the antistatic agent from liquid to solid by selecting ionic compounds with melting points of not less than 50°C. This parameter change eliminates the leakage problem that causes deterioration, while the solid ionic compounds remain in place to provide continuous antistatic protection.
3Object-affected harmful factors
If conventional antistatic agents are used in the adhesive layer, then electrostatic discharge is managed, but the adhesive layer exhibits poor low temperature stability
Solution Approach 1:
The patent changes the melting point parameter of the antistatic agent to not less than 50°C, ensuring the material remains solid at low temperatures. This parameter change directly addresses the low temperature stability issue while maintaining the electrostatic discharge management function.
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 provides enhanced low temperature stability, prevents leakage of ionic liquids, and maintains transparency and adhesiveness, while offering effective antistatic performance with surface resistance ranging from 1×10^8 to 1×10^13 Ω/m², suitable for various display applications including automotive use.
Implementation Method 1
an antistatic agent substantially comprising an ionic compound with a melting point of not less than 50°C
Implementation Method 2
a base polymer having a glass transition temperature Tg of not more than 0°C
Implementation Method 3
The base polymer contained in the composition is cross-linked using a cross-linking agent
Data Source
AI summary
Disclosed are an adhesive composition with excellent low temperature stability and without leakage of constitutional ingredients of an adhesive contained in the composition and, in addition, an optical member fabricated using the same. To achieve the purpose described above, the present invention provides an adhesive composition comprising an antistatic agent that includes an ionic compound having a melting point of not less than 50°C, as well as a base polymer having a Tg of not more than 0°C.