UV-Curable Adhesive Resin for Flexible Display Folding Durability
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Solution Overview
Problem
Existing adhesive resins for flexible display devices fail to provide sufficient adhesiveness and reliability during folding and bending operations, necessitating improved coating properties for various display device shapes.
Innovation Solution
A resin composition comprising (meth)acrylate monomers, urethane acrylate oligomers, and photoinitiators, with specific weight percentages of 2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate, and a viscosity range of 15-25 mPa·s, which forms an adhesive member with a storage elastic modulus of 0.01-0.1 MPa and 180° peel strength of 500 gf/25 mm or more, ensuring durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive resins are used in flexible display devices, then the basic adhesive function is provided, but the adhesiveness and reliability are insufficient during folding and bending operations
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin by incorporating specific monomers (2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate) in controlled amounts (5-10 wt% each), along with urethane acrylate oligomers and photoinitiators. This compositional parameter adjustment optimizes the balance between adhesiveness and flexibility, enabling the adhesive to maintain strong bonding during folding and bending operations while preserving the flexibility required for flexible display devices
Solution Approach 2:
The patent creates a composite adhesive resin system by combining multiple components with different functions: 2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate provide flexibility and adhesion, urethane acrylate oligomers contribute to mechanical strength and elasticity, and photoinitiators enable UV-curing. This composite material approach synergistically combines the advantages of each component to achieve both high reliability and flexibility in the adhesive layer
2Adaptability or versatility
If the adhesive resin is made more flexible to accommodate folding operations, then the flexibility is improved, but the bonding strength may be compromised
Solution Approach 1:
The patent adjusts the flexibility parameter by incorporating 2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate in specific amounts (5-10 wt% each), which modify the polymer chain structure to provide appropriate flexibility for folding operations while maintaining adequate bonding strength through the synergistic combination with urethane acrylate oligomers
Solution Approach 2:
The composite adhesive system combines flexible components (2-acryloyloxyethyl succinate and 4-hydroxybutyl acrylate) with stronger components (urethane acrylate oligomers) to achieve a balanced material that provides both the flexibility needed for folding operations and the bonding strength required for reliable adhesion in flexible display devices
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 resin composition provides excellent adhesiveness and reliability, maintaining strong bonding and flexibility in flexible display devices, even under folding and bending conditions, with improved durability and impact resistance.
Implementation Method 1
the resin composition includes at least one (meth)acrylate monomer, at least one urethane acrylate oligomer, and at least one photoinitiator
Data Source
AI summary
The present disclosure relates to a resin composition, a method of manufacturing a display device and an electronic device, and the resin composition according to an embodiment includes at least one (meth)acrylate monomer, at least one urethane acrylate oligomer, and at least one photoinitiator, wherein the resin composition includes, based on the total weight of the resin composition, about 5 wt % or more and about 10 wt % or less of 2-acryloyloxyethyl succinate, and about 5 wt % or more and about 10 wt % or less of 4-hydroxybutyl acrylate.