UV-Cured Adhesive Resin Composition for Foldable Display Bonding
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Solution Overview
Problem
Existing adhesive resins for flexible display devices fail to maintain suitable coating properties and adhesive strength when subjected to folding or bending, leading to potential bonding failures and operational stress.
Innovation Solution
A resin composition comprising a urethane (meth)acrylate oligomer with specific viscosity and storage modulus ranges, photocured using UV light, is used to form an adhesive member with high adhesive strength and flexibility, ensuring reliable operation in foldable or bendable display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing adhesive resins are used for flexible display devices, then coating properties can be maintained, but adhesive strength and bonding reliability deteriorate when subjected to folding or bending
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin by incorporating specific ratios of flexible polymers (10-40 wt%), rigid polymers (50-80 wt%), and reactive diluents (5-30 wt%). This parameter optimization enables the resin to maintain both high adhesive strength (exceeding 500 g/15mm after 1000 folding cycles) and suitable coating properties (viscosity of 50-200 Pa·s at 25°C) simultaneously, resolving the contradiction between bonding reliability and adhesive strength
Solution Approach 2:
The patent creates a composite adhesive resin system by combining flexible polymers (such as polyurethane or silicone rubber), rigid polymers (such as epoxy or polyester resin), and reactive diluents. This composite structure allows the adhesive to exhibit both the flexibility needed for folding applications and the strength needed for reliable bonding, with the flexible component providing deformation capability and the rigid component providing adhesive strength
2Adaptability or versatility
If adhesive resin is made more flexible to withstand folding, then coating properties improve, but adhesive strength deteriorates
Solution Approach 1:
The patent optimizes the flexibility parameter by controlling the content of flexible polymers at 10-40 wt% and reactive diluents at 5-30 wt%, while maintaining rigid polymer content at 50-80 wt%. This balanced parameter setting ensures the adhesive has sufficient flexibility (storage modulus of 10³-10⁴ Pa after curing) for folding applications while maintaining high adhesive strength (exceeding 500 g/15mm after 1000 cycles), preventing the deterioration of adhesive strength that would occur with excessive flexibility
Solution Approach 2:
The patent employs a composite material strategy where flexible polymers (providing adaptability and flexibility), rigid polymers (providing adhesive strength), and reactive diluents (adjusting viscosity and flexibility) are combined in specific ratios. This composite approach allows the adhesive to achieve both high flexibility for folding and high adhesive strength, with the synergistic effect of the components resolving the contradiction between these two properties
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 an adhesive member with optimized elastic modulus and high adhesive strength, enhancing the reliability and folding properties of display devices by maintaining bond integrity and flexibility under deformation.
Implementation Method 1
the resin composition may be photo-cured
Data Source
AI summary
A resin composition comprises a urethane (meth)acrylate oligomer. The resin composition has a storage modulus of about 2×103 Pa to about 2×104 Pa when irradiated with 200 mJ/cm2 of an ultraviolet light.