Separator-Attached Adhesive Layer with Phenolic Antioxidant
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Solution Overview
Problem
The existing adhesive layer structures in image display devices, particularly with thin polarizing films, face challenges in achieving moderate light peelability and durability due to high peel forces caused by peroxide cross-linking agents, leading to difficulties in peeling and potential damage during the separation process.
Innovation Solution
Incorporating a phenolic antioxidant into the adhesive composition with a (meth)acryl-based polymer and peroxide, and subjecting it to cross-linking, adjusts the peel force of the separator, preventing main chain breakage and ensuring sufficient adhesive force, thereby enhancing the durability and processability of the adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a peroxide cross-linking agent is added to the adhesive composition to enhance durability and bonding strength, then the adhesive force is improved, but the peel force of the separator becomes excessively high causing difficulty in peeling and potential damage
Solution Approach 1:
The patent applies parameter changes by introducing a phenolic antioxidant that modifies the chemical parameters of the adhesive composition. This antioxidant changes the cross-linking characteristics and bond strength parameters, enabling the adhesive to achieve moderate peelability while maintaining sufficient bonding strength. The phenolic antioxidant alters the chemical structure and reaction kinetics of the peroxide cross-linking system.
Solution Approach 2:
The patent uses composite materials by combining the (meth)acryl-based polymer, peroxide cross-linking agent, and phenolic antioxidant into a multi-component adhesive composition. This composite formulation creates a synergistic effect where the phenolic antioxidant moderates the cross-linking process, resulting in an adhesive layer with balanced properties for both strong bonding and controlled peelability.
2Length of moving object
If the polarizing film thickness is reduced to meet aesthetic and portability requirements, then the device thickness and weight are decreased, but the durability and resistance to peeling damage are compromised
Solution Approach 1:
The patent applies parameter changes by modifying the adhesive composition parameters with the phenolic antioxidant to create an adhesive layer that provides enhanced protection and durability to thin polarizing films. The antioxidant modifies the adhesive's mechanical and chemical properties to maintain strength and peelability control even when the film is thinned.
3Ease of operation
If the peel force is reduced to facilitate easy separator removal, then the ease of operation is improved, but the adhesive layer may peel or rip from the polarizing film during the process
Solution Approach 1:
The patent applies parameter changes by using the phenolic antioxidant to precisely control the cross-linking parameters of the adhesive composition. This creates an optimal balance where the peel force is moderate enough for easy separator removal while the adhesive bonding remains strong enough to prevent layer separation during the process.
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 modified adhesive layer structure achieves moderate light peelability and excellent processability, preventing peeling or ripping issues during separator removal and maintaining durability even in thin polarizing films, especially in harsh environments.
Implementation Method 1
a second step of, after completion of the first step, thermally decomposing a part or an entirety of the peroxide to adjust a peel force of the silicone-coated release liner
Implementation Method 2
cross-linking is progressed in a curing step after forming a layer of the adhesive composition on a separator or the like and then subjecting the layer to drying
Implementation Method 3
In the case where a peroxide is added as a cross-linking agent to an adhesive composition for forming an adhesive layer
Data Source
AI summary
Provided are a separator-attached adhesive layer structure which comprises a separator having moderate light peelability with respect to an adhesive layer and exhibits excellent processability and durability, and a production method therefor. The production method comprises: a first step of forming a layer of an adhesive composition containing a (meth)acryl-based polymer, a peroxide and a phenolic antioxidant, on a release treatment surface of a separator subjected to a release treatment; and a second step of, after completion of the first step, heating the adhesive composition to cause cross-linking therein so as to be formed as an adhesive layer.