Low-Viscosity Resin Composition for Foldable Display Adhesives
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Solution Overview
Problem
Existing adhesive resins for flexible display devices do not adequately address the need for excellent coating properties across various components and forms of display devices, particularly in foldable and bendable devices, leading to suboptimal performance and durability.
Innovation Solution
A resin composition comprising urethane (meth)acrylate, monofunctional (meth)acrylate monomer, and polyether-modified dimethylsiloxane with specific molecular weights and viscosities, excluding polyfunctional (meth)acrylate monomers, is used to form an adhesive member, which is applied via inkjet or dispensing methods, ensuring suitable applicability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional adhesive resins are used in flexible display devices, then the basic adhesion function is provided, but the coating properties are insufficient for various components and forms of display devices
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin by incorporating siloxane groups and controlling the molecular weight distribution. This modifies the resin's flow characteristics and surface tension, enabling it to achieve both excellent coating properties on various display device components and reliable adhesion performance across different device forms including foldable and bendable displays
Solution Approach 2:
The patent creates a composite adhesive resin system by combining siloxane-modified polymers with specific functional monomers. This composite structure provides both the coating versatility needed for different display components and the adhesive reliability required for durable bonding, resolving the contradiction between adaptability and reliability
2Ease of operation
If the resin composition is applied via inkjet or dispensing methods, then the applicability is improved, but the viscosity control becomes more critical
Solution Approach 1:
The patent precisely controls the viscosity parameter of the resin composition by adjusting the siloxane content and molecular weight distribution. This enables the adhesive to be easily applied via inkjet or dispensing methods while maintaining consistent flow characteristics and preventing nozzle clogging or application defects
Solution Approach 2:
The patent replaces traditional high-viscosity adhesive application methods with a low-viscosity resin composition suitable for inkjet and dispensing techniques. This substitution of the application mechanism requires precise viscosity control to ensure proper atomization and deposition while maintaining ease of operation
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 coating properties and adhesion, enhancing the durability and performance of foldable and bendable display devices by maintaining structural integrity and optical clarity.
Implementation Method 1
at least one photoinitiator including a radical polymerization initiator
Data Source
AI summary
A resin composition includes at least one urethane (meth)acrylate having a weight-average molecular weight of about 5,000 to about 50,000, at least one monofunctional (meth)acrylate monomer, at least one photoinitiator including a radical polymerization initiator, and a polyether-modified dimethylsiloxane having a number-average molecular about 1,000 to about 30,000, and excludes any polyfunctional (meth)acrylate monomer. The resin composition has a viscosity of about 5 mPa·s to about 20 mPa·s as measured at about 25° C. by the JIS K7117-2 method. Based on 100% of a total molecular weight of the polyether-modified dimethylsiloxane, a molecular weight of the dimethylsiloxane group may be about 15% to about 90%. When the sum of a weight of the urethane (meth)acrylate and a weight of the monofunctional (meth)acrylate monomer is 100 parts by weight, a weight of the polyether-modified dimethylsiloxane may be about 0.001 parts by weight to about 0.1 parts by weight.