Polymer Compound Adhesion for Polarizing Plates
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Solution Overview
Problem
There is a need to improve the adhesiveness between hydrophobic and hydrophilic members in laminated structures, such as polarizing plates used in image display devices, where the existing adhesives are insufficient for wide viewing angles and thin film configurations.
Innovation Solution
A polymer compound comprising specific repeating units, including those represented by Formulas (I), (II), and (III), which enhance crosslinking reactions with hydrophobic members and affinity with hydrophilic members, thereby improving adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a polyvinyl alcohol-based adhesive is used to laminate the polarizer and optical film, then the lamination process is simple, but the adhesiveness between the hydrophobic optically anisotropic layer and hydrophilic polarizer is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive by incorporating specific functional groups (carboxyl, hydroxyl, or amine groups with specific content ranges) into the polyvinyl alcohol-based adhesive. This parameter change enables the adhesive to simultaneously achieve good adhesiveness to both hydrophobic optically anisotropic layers and hydrophilic polarizers while maintaining the simplicity of the lamination process.
Solution Approach 2:
The invention creates a composite adhesive material by combining polyvinyl alcohol base resin with specific functional additives or modified components that provide both hydrophobic and hydrophilic characteristics. This composite structure allows the single adhesive to bond effectively to both hydrophobic and hydrophilic surfaces, resolving the adhesion problem without complicating the manufacturing process.
2Length of stationary object
If the optically anisotropic layer is made thinner to achieve thin film configuration, then the polarizing plate thickness is reduced, but the alignment properties and surface states deteriorate
Solution Approach 1:
The invention optimizes the thickness parameter of the optically anisotropic layer within a specific range (3 μm to 10 μm) and combines it with surface treatment parameters and adhesive composition parameters to maintain excellent alignment properties and surface states even at reduced thickness, achieving thin film configuration without performance deterioration.
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 polymer compound significantly enhances the adhesiveness between hydrophobic and hydrophilic members, leading to improved alignment properties and surface states in polarizing plates, with enhanced adhesion and reduced peeling issues.
Implementation Method 1
enhance crosslinking reactions with hydrophobic members
Implementation Method 2
P1 represents a polymerizable group
Implementation Method 3
affinity with hydrophilic members
Data Source
AI summary
An object of the present invention is to provide a polymer compound capable of improving adhesiveness between a hydrophobic member and a hydrophilic member. The polymer compound of the present invention is a polymer compound having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II).