Inkjet Resin Composition for Foldable Displays
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Solution Overview
Problem
Existing inkjet resin compositions for foldable display devices face challenges with high volatility, poor ejection properties, and increased spreadability, which affect the adhesive layer's performance and reliability, especially during folding and low-temperature conditions.
Innovation Solution
An inkjet resin composition is developed with a specific formulation including 20-30 weight % of 2-ethylhexyl acrylate, 20-30 weight % of 4-hydroxybutyl acrylate, 40-50 weight % of isodecyl acrylate, 1-10 weight % of urethane acrylate, 1-5 weight % of initiator, 1-5 weight % of silane coupling agent, and 0.05-1 weight % of surface flow control additive, such as polydimethylsiloxan (PDMS), to reduce volatility, enhance ejection properties, and minimize spreadability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inkjet resin composition is used, then adhesive bonding is achieved, but volatility is high causing ejection and surface defects
Solution Approach 1:
The patent modifies the chemical composition parameters by incorporating specific acrylate monomers (2-ethylhexyl acrylate, 4-hydroxybutyl acrylate, isodecyl acrylate) with controlled molecular weights and functional groups. This changes the volatility parameters of the resin composition while maintaining adhesive properties, directly resolving the contradiction between bonding reliability and substance loss during printing.
Solution Approach 2:
The patent creates a composite resin system combining multiple acrylate monomers with silane coupling agents and surface flow control additives. This composite formulation achieves synergistic effects where the combination of components provides both low volatility and effective adhesive bonding, eliminating the need to choose between reliability and reduced substance loss.
2Productivity
If resin viscosity is reduced for better ejection, then ejection property improves, but spreadability increases causing surface defects
Solution Approach 1:
The patent introduces surface flow control additives as intermediary substances that mediate between the resin's ejection flow and final surface positioning. These additives temporarily reduce viscosity during ejection for good productivity, then control the resin's spreadability after deposition to prevent surface defects, effectively decoupling the two conflicting requirements.
Solution Approach 2:
The patent employs temperature and composition parameter changes to dynamically control resin viscosity. During ejection, the resin is maintained at conditions favoring low viscosity for high productivity, while after deposition, parameter changes (cooling, crosslinking initiation) increase viscosity to minimize spreadability and maintain manufacturing precision.
3Adaptability or versatility
If resin composition is optimized for low-temperature flexibility, then folding characteristics improve, but volatility increases
Solution Approach 1:
The patent develops a composite resin system where flexible chain acrylates (providing low-temperature adaptability) are combined with higher molecular weight components and crosslinking agents (reducing volatility). The silane coupling agents create a three-dimensional network that locks the flexible components in place, preventing their volatilization while maintaining the folding characteristics at low temperatures.
Solution Approach 2:
The patent applies different functional components to different molecular levels within the resin system. Lighter, more flexible molecules provide the low-temperature adaptability needed for folding, while heavier crosslinking structures and network formers provide volatility resistance. This local differentiation of material qualities resolves the contradiction between adaptability and substance loss.
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 inkjet resin composition achieves reduced volatility, improved ejection properties, and minimized spreadability, ensuring secure bonding of layers, maintaining low-temperature folding characteristics, and preventing surface defects like cratering, thereby enhancing the reliability and performance of foldable display devices.
Implementation Method 1
The initiator may include at least one of 2,2-dimethoxy-1,2-diphenylethan-1-one or Bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide
Implementation Method 2
A surface tension of the inkjet resin composition may be about 25 dyne/cm to about 31 dyne/cm
Data Source
AI summary
An inkjet resin composition includes about 20% to about 30% by weight of 2-ethylhexyl acrylate, about 20% to about 30% by weight of 4-hydroxybutyl acrylate, about 40% to about 50% by weight of isodecyl acrylate, about 1% to about 10% by weight of urethane acrylate, about 1% to about 5% by weight of an initiator, about 1% to about 5% by weight of a silane coupling agent, and about 0.05% to about 1% by weight of a surface flow control additive.