Polarizing Plate Resin Layer Adhesion
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Solution Overview
Problem
The existing polarizing plates used in image display devices suffer from insufficient adhesiveness between the cured resin layer and the pressure sensitive adhesive layer, leading to residue issues during the peeling process, which deteriorates the reworking property.
Innovation Solution
A polarizing plate with a resin layer directly formed on the polarizer, featuring a hydrogen bonding component of surface free energy within a specific range (3.5 mN/m or more), a thickness of 70 μm or less, and a pressure sensitive adhesive layer, including an acrylic adhesive with an isocyanate group, to enhance adhesiveness and peeling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cured resin layer is formed directly on the polarizer to improve mechanical strength, then the mechanical strength is improved, but the adhesiveness between the resin layer and pressure sensitive adhesive layer becomes insufficient, causing pressure sensitive adhesive residue during peeling
Solution Approach 1:
The invention changes the chemical composition parameters of the curable resin composition by incorporating specific functional groups (isocyanate groups, carboxyl groups, or hydroxyl groups) that can form strong chemical bonds with the pressure sensitive adhesive layer, thereby improving adhesiveness while maintaining mechanical strength
Solution Approach 2:
The invention uses a composite resin system combining polyfunctional (meth)acrylic monomers with specific functional groups (isocyanate, carboxyl, or hydroxyl groups) to create a multi-functional cured resin layer that provides both mechanical strength and improved adhesiveness to the pressure sensitive adhesive layer
2Length of moving object
If the polarizer thickness is reduced to meet thinner display device requirements, then the display device thickness is reduced, but the mechanical strength of the polarizing plate deteriorates
Solution Approach 1:
The invention changes the properties of the resin layer by incorporating functional groups that enhance bonding strength, allowing the use of thinner polarizers (20 μm or less) while maintaining overall mechanical strength through improved interfacial adhesion between layers
Solution Approach 2:
The invention uses a composite structure with a thin polarizer reinforced by a cured resin layer with enhanced adhesive properties, creating a strong interface that compensates for the reduced polarizer thickness and maintains mechanical integrity
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 solution provides sufficient adhesiveness between the resin layer and the pressure sensitive adhesive layer, ensuring excellent peeling properties during the reworking process and preventing residue formation on the image display device.
Implementation Method 1
a hydrogen bonding component of a surface free energy of the resin layer is 3.5 mN/m or more
Data Source
AI summary
The present invention is to provide a polarizing plate exhibiting sufficient adhesiveness between a resin layer and a pressure sensitive adhesive layer and excellent peeling property in reworking process, and an image display device provided with the polarizing plate. The polarizing plate of the present invention includes a polarizer, and the resin layer that is in direct contact with the polarizer, in which the thickness of the polarizer is 20 μm or less, a hydrogen bonding component of a surface free energy of the resin layer is 3.5 mN/m or more, and the thickness of the polarizing plate is 70 μm or less.