Radical-Curable Adhesive Composition for Polarizing Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional radical-curable adhesives for polarizing plates face challenges in maintaining adhesive strength and heat resistance, especially under high humidity conditions, and are not suitable for thin film applications or direct attachment to display panels without compromising thermal shock reliability.
Innovation Solution
A radical-curable adhesive composition comprising a radical-polymerizable first compound with at least two hydroxyl groups, a radical-polymerizable second compound with hydrophilic functional groups, and a radical initiator, which provides excellent adhesive strength and heat resistance, suitable for various film materials and thin film applications, including direct attachment to display panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If radical-curable adhesives with acryl amide-based compounds are used to achieve high curing speed, then curing speed is improved, but adhesive strength is reduced under high humidity conditions
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating hydrophilic functional groups (such as carboxylic acid groups) into the acryl amide-based compound structure. This parameter change enables the adhesive to maintain both high curing speed and excellent adhesive strength under high humidity conditions by utilizing water molecules to enhance crosslinking density without compromising the radical polymerization mechanism that provides fast curing.
2Ease of manufacture
If aqueous adhesives are used to achieve ease of application, then ease of manufacture is improved, but adhesive strength is weak when acryl-based films or COP films are used as protective films
Solution Approach 1:
The patent creates a composite adhesive system that combines the advantages of aqueous adhesives (ease of application) with the bonding capabilities needed for acryl-based and COP films. The composite formulation includes acryl amide-based compounds with hydrophilic functional groups that can form strong interactions with both hydrophilic and hydrophobic film surfaces, achieving universal adhesion while maintaining water-based application benefits.
3Ease of manufacture
If aqueous adhesives are used to achieve ease of application, then ease of manufacture is improved, but curls are generated in polarizing plate due to drying process
Solution Approach 1:
The patent replaces the conventional drying mechanism (thermal evaporation of water) with a radical polymerization-based curing mechanism. This substitution eliminates the drying process that causes curls and dimensional changes in the polarizing plate, while still achieving complete adhesion through crosslinking of the acryl amide-based compound initiated by UV or other radiation sources.
4Length of stationary object
If acryl-based adhesives are used to achieve thin film formation, then thickness is reduced, but heat resistance reliability is compromised in thermal shock tests
Solution Approach 1:
The patent changes the chemical composition parameters of thin-film adhesives by incorporating acryl amide-based compounds with hydrophilic functional groups that provide both low viscosity (enabling thin film formation) and high crosslinking density (providing thermal stability). The hydrophilic groups form strong hydrogen bonding networks that maintain adhesive integrity during thermal shock while allowing the adhesive layer to remain sufficiently thin.
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 maintains strong adhesive properties and thermal stability even under high humidity, enabling the production of thermally stable polarizing plates and improving productivity by allowing thin film formation and direct attachment to display panels with enhanced heat resistance.
Implementation Method 1
a radical-curable adhesive composition including a radical-polymerizable first compound which includes at least two hydroxyl groups in the molecule and has a hydroxyl value of 500 mg KOH/g or more
Data Source
AI summary
The present invention relates to a radical-curable adhesive composition including a radical-polymerizable first compound that includes at least two hydroxyl groups in the molecule, and having hydroxyl value of 500 mg KOH/g or greater, and a polarizing plate and an optical member including the radical-curable adhesive composition.