Adhesive Composition for Polarizing Plate Aging Reduction
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Solution Overview
Problem
The existing adhesive compositions for polarizing plates require lengthy aging processes, which are time-consuming and costly, and result in poor properties such as creep characteristics, peel strength, reliability, and light leakage if not adequately aged, while reducing the aging time leads to poor pot-life and coatability.
Innovation Solution
A novel adhesive composition comprising a (meth)acrylic copolymer formed by copolymerizing a monomer mixture including a hydroxyl group-containing (meth)acrylic monomer, a tertiary amine group-containing (meth)acrylic monomer, and a monomer with a glass transition temperature of 100° C or greater, allowing for a high gel fraction and good coatability after only 12 hours of aging, thereby reducing the aging time and eliminating the need for an aging chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive composition is aged for a long period (3-7 days or longer), then the adhesive film properties (creep characteristics, peel strength, reliability, light leakage prevention) are improved, but the production time and cost increase
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive, specifically incorporating a (meth)acrylic copolymer with hydroxyl groups and a curing agent that reacts to form a gel structure. This chemical parameter change enables the adhesive to achieve sufficient gel fraction (5-60%) and desired film properties within a shortened aging period of 1-7 days, resolving the contradiction between reliability improvement and time loss.
2Loss of time
If the aging time is reduced, then the production time and cost are reduced, but the pot-life and coatability of the adhesive composition deteriorate
Solution Approach 1:
The patent performs preliminary action by pre-synthesizing the (meth)acrylic copolymer with specific functional groups (hydroxyl groups) and selecting appropriate curing agents before the aging process. This preliminary preparation of chemical structure ensures that the adhesive maintains good pot-life and coatability during the shortened aging period of 1-7 days, while still achieving the required gel fraction and film properties without deterioration in manufacturing ease.
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 achieves a high gel fraction and improved reliability, creep characteristics, and light leakage prevention after 12-hour aging, ensuring good processability and stability, while maintaining pot-life and preventing failures like detachment and bubbling in polarizing plates.
Implementation Method 1
a (meth)acrylic copolymer prepared by copolymerizing a monomer mixture and a curing agent. The monomer mixture includes a hydroxyl group-containing (meth)acrylic monomer, a tertiary amine group-containing (meth)acrylic monomer and a monomer having a glass transition temperature (Tg) of about 100° C. or greater
Implementation Method 2
The adhesive composition has a gel fraction of about 50% or greater after aging for 12 hours
Implementation Method 3
a (meth)acrylic copolymer prepared by copolymerizing a monomer mixture and a curing agent
Implementation Method 4
Each of the adhesive films may be formed by coating an adhesive composition for polarizing plates onto one surface of the polarizing plate or a release film, followed by aging for a predetermined period of time
Data Source
AI summary
An adhesive composition for polarizing plates includes a (meth)acrylic copolymer prepared by copolymerization of a monomer mixture and a curing agent. The monomer mixture includes a hydroxyl group-containing (meth)acrylic monomer, a tertiary amine group-containing (meth)acrylic monomer and a monomer having a glass transition temperature (Tg) of about 100° C. or greater. The adhesive composition has a gel fraction of about 50% or greater after aging for 12 hours. An adhesive film is formed from the adhesive composition. An optical display includes the adhesive film.