Modified Cyclodextrin Pressure-Sensitive Adhesive for Display Bending
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Solution Overview
Problem
Conventional pressure sensitive adhesives used in repetitive bending displays suffer from delamination and reduced durability due to repeated bending, leading to issues with cohesive strength and reworkability.
Innovation Solution
A pressure sensitive adhesive composition containing a multimer of modified cyclodextrin, preferably an acrylic-based adhesive with a crosslinked structure, which maintains low elasticity and high cohesive strength, ensuring excellent adhesion and reworkability, and includes a silane coupling agent for improved interfacial bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure sensitive adhesive is made low elastic to resist repeated bending, then bending resistance is improved, but cohesive strength is reduced and reworkability deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure sensitive adhesive by incorporating a specific silane coupling agent (γ-glycidoxypropyltrimethoxysilane) and controlling the ratio of polymer to silane coupling agent (0.1-10 parts by mass). This compositional parameter change enables the adhesive to achieve both low elasticity for bending resistance and sufficient cohesive strength for reworkability.
Solution Approach 2:
The patent creates a composite pressure sensitive adhesive system by combining an acrylic polymer with a silane coupling agent that forms crosslinked structures. This composite material approach allows the adhesive to exhibit both elastic properties (for reworkability) and resistance to repeated bending through the crosslinked network structure.
2Ease of operation
If the pressure sensitive adhesive layer is made harder by increasing crosslinker to improve reworkability, then reworkability is improved, but pressure sensitive adhesive properties deteriorate and repetitive bending ability is poor
Solution Approach 1:
The patent precisely controls the crosslinking degree by limiting the silane coupling agent content to 0.1-10 parts by mass per 100 parts of polymer. This parameter control ensures sufficient reworkability while maintaining the elastic properties needed for repetitive bending resistance.
Solution Approach 2:
The silane coupling agent forms localized crosslinked structures within the pressure sensitive adhesive matrix. These local crosslinked regions provide reinforcement for reworkability while the overall adhesive matrix maintains its elastic character for bending flexibility.
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 provides excellent bending resistance and image visibility from various angles, preventing delamination and maintaining adhesive properties even with repeated bending, while ensuring easy removal and reapplication.
Implementation Method 1
a pressure sensitive adhesive obtained from a pressure sensitive adhesive composition containing a multimer of modified cyclodextrin... contains a multimer of modified cyclodextrin and can thereby obtain high cohesive strength while maintaining low elasticity and interfacial adhesion to an adherend
Data Source
AI summary
A pressure sensitive adhesive composition containing a multimer of modified cyclodextrin; a pressure sensitive adhesive obtained from the pressure sensitive adhesive composition; and a pressure sensitive adhesive sheet having a pressure sensitive adhesive layer formed of the pressure sensitive adhesive. The multimer of modified cyclodextrin is preferably a dimer. The pressure sensitive adhesive is preferably an acrylic-based pressure sensitive adhesive and, in particular, preferably contains a crosslinked product obtained by crosslinking a (meth)acrylic ester polymer using a crosslinker.