Pressure-Sensitive Adhesive Composition for Stable Antistatic Performance
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Solution Overview
Problem
Existing pressure-sensitive adhesive compositions for electronics, such as those used in LCD manufacturing, face challenges with static electricity, which affects the alignment and durability of LCDs, and previous solutions using organic ionic salts or metal salts either require high amounts leading to precipitation or compromise adhesive strength and durability under high-temperature/humidity conditions.
Innovation Solution
A pressure-sensitive adhesive composition combining an acrylic polymer with specific ratios of (meth)acrylic acid ester and (meth)acrylic acid alkylene oxide monomers, an ionic compound in a liquid phase at room temperature, and a metal salt in a solid phase, ensuring stable antistatic properties and maintaining adhesive strength and durability even under extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of ionic salt is used to reduce surface resistance, then antistatic performance is improved, but precipitation occurs and adhesive strength deteriorates
Solution Approach 1:
The patent changes the physical state parameter of the ionic compound from solid to liquid at room temperature. This allows the ionic compound to be effectively used at much lower concentrations (0.01-5 parts by weight) compared to solid ionic salts, achieving good antistatic performance (surface resistance 10^8-10^12 Ω/□) without causing precipitation and while maintaining adhesive strength.
Solution Approach 2:
The patent creates a composite pressure-sensitive adhesive composition combining acrylic polymer, liquid ionic compound, and metal salt. This composite system achieves synergistic effects where the liquid ionic compound provides antistatic functionality without the drawbacks of using large amounts of solid ionic salts, maintaining both antistatic performance and adhesive strength.
2Reliability
If hydrophilic monomer is added to achieve conductivity and moisture adsorption, then antistatic properties are improved, but adhesive strength and durability are degraded under high-temperature conditions
Solution Approach 1:
The patent introduces a liquid ionic compound as an intermediary substance that provides antistatic functionality without the harmful effects of hydrophilic monomers. The liquid ionic compound adsorbs moisture from the air to provide conductivity and antistatic properties, while its ionic structure and liquid state allow it to maintain adhesive strength and durability under high-temperature and high-humidity conditions, unlike hydrophilic monomers which cause degradation.
3Reliability
If ionic compound content is increased to reduce surface resistance, then antistatic performance is improved, but optical transparency is compromised
Solution Approach 1:
The patent changes the physical state of the ionic compound to liquid at room temperature, which allows for effective antistatic performance at very low concentrations (0.01-5 parts by weight). This low concentration ensures that the pressure-sensitive adhesive composition maintains excellent optical transparency while achieving the desired antistatic properties (surface resistance 10^8-10^12 Ω/□).
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 composition provides stable antistatic performance and maintains excellent physical properties, including adhesive strength and durability, even when exposed to high-temperature or high-humidity conditions for extended periods, preventing precipitation and degradation of optical transparency.
Implementation Method 1
the hydrophilic monomer serves to reduce a level of electric charge through adsorption of moisture in the air
Implementation Method 2
the metal salt serves to give conductivity
Data Source
AI summary
A pressure-sensitive adhesive composition is provided. The pressure-sensitive adhesive composition can show stable antistatic performance, and in particular can stably maintain its antistatic performance even when the pressure-sensitive adhesive composition is kept for an extended time under extreme conditions or conditions in which environmental changes are severe, and also has excellent general physical properties such as pressure-sensitive adhesive properties, durability and workability.