Adhesive Composition for Polarizing Plate Anti-Static Durability
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Solution Overview
Problem
Conventional adhesive compositions for liquid crystal display devices face challenges in simultaneously achieving anti-static properties, re-workability, and durability, with ionic compounds used as anti-static agents often leading to decreased durability and inhibited gelling, which complicates the curing process.
Innovation Solution
An adhesive composition comprising a vinyl-acrylate copolymer with a hydroxyalkylvinylether monomer, a cross-linking agent, and an ionic solid with a melting point of at least 40°C, along with a silane coupling agent, which balances anti-static properties, re-workability, and durability by minimizing surface transfer of ionic compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ionic compounds are added to adhesive as anti-static agent, then anti-static properties are improved, but durability decreases due to surface transfer and bubbling
Solution Approach 1:
The patent changes the physical state parameter of the anti-static agent from liquid/ionic compound to solid state, specifically using solid ionic compounds with melting points of 40°C or higher. This parameter change prevents surface transfer and bubbling while maintaining anti-static properties, thereby resolving the contradiction between anti-static performance and durability.
2Object-affected harmful factors
If ionic compounds are added to adhesive as anti-static agent, then anti-static properties are improved, but gelling is inhibited and curing period increases
Solution Approach 1:
The patent changes the physical state parameter of the anti-static agent from liquid to solid, using solid ionic compounds that do not interfere with the gelling process. This allows the adhesive to gel normally and reduces the curing period while maintaining anti-static properties.
3Reliability
If adhesive strength is increased for durability, then durability is improved, but re-workability decreases
Solution Approach 1:
The patent uses solid ionic compounds with specific melting points (40°C or higher) that provide adequate adhesive strength for durability while allowing for re-workability. The solid state prevents excessive surface transfer that would otherwise make re-work difficult, thus balancing durability and re-workability.
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 effectively decreases the curing period while maintaining durability and re-workability, preventing bubbling and delamination, and ensuring good initial adhesion without excessive adhesive strength at high temperatures or humidity, thus enhancing productivity and performance.
Implementation Method 1
a process for combination of a polarizing plate with a liquid crystal cell may generate electrostatic discharge during peeling of a release film
Implementation Method 2
a silane coupling agent
Implementation Method 3
a cross-linking agent; a vinyl-acrylate copolymer including a hydroxyalkylvinylether monomer
Data Source
AI summary
Disclosed are an adhesive composition and a polarizing plate including the same and, more particularly, an adhesive composition including a vinyl-acrylate copolymer including a hydroxyalkylvinylether monomer as a repeating unit, a cross-linking agent, ionic solid, and a silane coupling agent and, in addition, a polarizing plate including the same. Such adhesive composition may have desired re-workability without decrease in durability caused by surface transfer of an ionic compound, and allow effective gelling of adhesive fraction, to thereby considerably reduce a curing period.