Modified Polyvinyl Alcohol Adhesive for Polarizer Bonding
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Solution Overview
Problem
Existing polyvinyl alcohol-based resin adhesives for polarizing plates face limitations in adhesion, humidity resistance, and water resistance, particularly at increased line speeds, necessitating an adhesive with improved solubility, adhesiveness, and resistance.
Innovation Solution
A modified polyvinyl alcohol-based resin with an acrylic group and a hydroxyl group, combined with a compound having epoxy and acrylic groups, is used to create an adhesive that enhances adhesion, humidity resistance, and water resistance, while maintaining excellent solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical polyvinyl alcohol-based resin adhesive is used, then the adhesive provides basic bonding function, but the adhesion, humidity resistance, and water resistance are insufficient
Solution Approach 1:
The patent modifies the polyvinyl alcohol resin by introducing an acrylic group through chemical reaction, changing the chemical composition parameters of the resin. This modification enables the resin to form cross-linked structures that significantly improve adhesion, humidity resistance, and water resistance while maintaining ease of application
Solution Approach 2:
The patent creates a composite adhesive system by combining modified polyvinyl alcohol resin containing acrylic groups with cross-linking agents. This composite approach leverages the properties of both components to achieve superior bonding performance, humidity resistance, and water resistance compared to using polyvinyl alcohol alone
2Reliability
If a cross-linking agent is added to improve adhesion and resistance, then the adhesion and resistance improve, but the solubility with respect to water decreases
Solution Approach 1:
The patent carefully controls the degree of modification of polyvinyl alcohol by introducing acrylic groups at optimized concentrations. This parameter optimization ensures that sufficient cross-linking occurs to improve adhesion and water resistance, while maintaining adequate solubility with water for proper adhesive application
Solution Approach 2:
The patent introduces cross-linking functionality locally at specific sites within the polyvinyl alcohol chains through acrylic group formation, rather than uniformly throughout. This localized modification approach enables improved bonding properties while preserving overall solubility and adhesive workability
3Productivity
If the line speed is increased to improve productivity, then the productivity improves, but the humidity resistance, water resistance, and adhesion become insufficient
Solution Approach 1:
The patent pre-modifies the polyvinyl alcohol resin with acrylic groups before application, creating a chemically enhanced adhesive that is ready to provide superior bonding performance even under high-speed production conditions. This preliminary chemical preparation ensures that the adhesive maintains its performance properties regardless of application speed
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 demonstrates improved adhesion, humidity resistance, and water resistance, as well as enhanced solubility, leading to better performance in polarizing plates and display devices.
Implementation Method 1
a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and having a hydroxyl group formed by the introduction of the acrylic group
Implementation Method 2
an adhesive for bonding a polarizer and a protective film having improved solubility with respect to water, excellent adhesiveness with respect to the polarizer and the protective film
Implementation Method 3
improved solubility with respect to water
Data Source
AI summary
Provided are a modified polyvinyl alcohol-based resin with an acrylic group introduced thereto and including a hydroxyl group formed during the introduction of the acrylic group, an adhesive including the modified polyvinyl alcohol-based resin having excellent adhesion, humidity resistance, and water resistance, an adhesive including a polyvinyl alcohol-based resin, and a compound having an epoxy group, and an acrylic group, a polarizing plate and an image display device including the adhesive. The adhesive for a polarizing plate according to an embodiment of the present invention has excellent adhesion, humidity resistance, and water resistance as well as having excellent solubility with respect to water and an increase in adhesion while physical properties of a typical polyvinyl alcohol-based resin are maintained.