UV-Curable Adhesive Composition for Polarizing Plate Dimensional Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Polarizing plates prepared with aqueous adhesives suffer from dimensional changes due to heat from backlights, causing localized screen distortion and significant light leakage, especially when displaying dark images.
Innovation Solution
An adhesive composition for polarizing plates comprising an epoxy compound, a (meth)acrylic compound, and a polyfunctional thiol compound, with specific weight ratios and structures, is used to form an adhesive layer that provides strong adhesion, durability, and resistance to heat-induced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If aqueous adhesives are used for polarizing plates, then ease of manufacture is improved, but dimensional stability deteriorates due to heat from backlights causing screen distortion
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive from aqueous PVA to a solvent-free system containing epoxy compound, (meth)acrylic compound, and photoinitiator. This parameter change eliminates water content that causes dimensional instability under heat while maintaining ease of manufacture through UV curing technology.
Solution Approach 2:
The patent uses a composite adhesive system combining epoxy compound (for strength and heat resistance), (meth)acrylic compound (for adhesion and UV reactivity), and photoinitiator (for curing). This composite material approach achieves both ease of manufacture through UV curing and dimensional stability under backlight heat.
2Ease of manufacture
If aqueous adhesives are used for polarizing plates, then ease of manufacture is improved, but light leakage increases due to localized screen distortion
Solution Approach 1:
The patent changes the adhesive composition from aqueous to solvent-free with specific functional components, eliminating the screen distortion that causes light leakage while maintaining ease of manufacture through UV curing process.
Solution Approach 2:
The composite adhesive system with epoxy, (meth)acrylic compound, and photoinitiator provides uniform curing and dimensional stability, preventing the screen distortion that leads to light leakage while keeping the manufacturing process simple.
3Stability of the object's composition
If cation polymerizable UV curing adhesive is used instead of aqueous adhesives, then dimensional stability is improved, but adhesion strength deteriorates
Solution Approach 1:
The patent combines epoxy compound (providing strong adhesion and heat resistance), (meth)acrylic compound (providing UV reactivity and adhesion), and photoinitiator (enabling curing) in a composite adhesive system. This composite approach achieves both dimensional stability under heat and strong adhesion strength, overcoming the limitations of single-component UV adhesives.
Solution Approach 2:
The patent optimizes the composition parameters including the types and ratios of epoxy compound, (meth)acrylic compound, and photoinitiator to achieve both dimensional stability and strong adhesion, improving upon conventional UV curing adhesives.
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 ensures high cohesion and cross-linking density, preventing adhesion deterioration and light leakage, while maintaining reliability and water resistance, even under warm water exposure.
Implementation Method 1
a cation polymerizable UV curing adhesive may be used instead of the aqueous adhesives
Implementation Method 2
an adhesive composition including an epoxy compound, a (meth)acrylic compound, and a polyfunctional thiol compound
Data Source
AI summary
An adhesive composition for polarizing plates, a polarizing plate using the same, and an optical member including the same, the adhesive composition including an epoxy compound, a (meth)acrylic compound, and a polyfunctional thiol compound.