Resin Composition for Flexible Display Adhesion
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Solution Overview
Problem
Existing adhesive resins for flexible display devices face challenges in maintaining reliability and durability, especially at high and low temperatures, and during folding or bending, due to issues with viscosity, adhesion, and flexibility.
Innovation Solution
A resin composition comprising a (meth)acrylate with a hydroxy group, a polymer with polyisoprene or polybutadiene as the main skeleton, and a urethane (meth)acrylate oligomer, which has a low glass transition temperature and high adhesion properties, allowing for excellent coating properties and stability at various temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive resin is used for flexible display devices, then adhesion is achieved, but reliability deteriorates at high and low temperatures and during folding
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin by incorporating specific components: a polymer with polyisoprene or polybutadiene main skeleton (providing flexibility and low glass transition temperature), a (meth)acrylate monomer with hydroxy group (enhancing adhesion), and controlling the glass transition temperature to be -50°C to 0°C. These parameter changes enable the adhesive to maintain reliability across temperature ranges and during folding operations.
2Stability of the object's composition
If adhesive resin formulation is optimized for low glass transition temperature, then flexibility is improved, but viscosity control becomes difficult
Solution Approach 1:
The patent uses a composite material system combining three key components: (1) a polymer with polyisoprene or polybutadiene main skeleton providing the base flexibility and low glass transition temperature, (2) a (meth)acrylate monomer with hydroxy group contributing to adhesion and viscosity control, and (3) additional (meth)acrylate monomers. This composite formulation achieves the desired glass transition temperature range (-50°C to 0°C) while maintaining controllable viscosity through the synergistic interaction of components.
3Reliability
If adhesive member is designed for high flexural adhesiveness, then folding reliability is improved, but adhesion strength may be compromised
Solution Approach 1:
The patent applies local quality by providing different functional properties at different molecular levels: the polymer backbone (polyisoprene/polybutadiene) provides flexibility and fold endurance, while the (meth)acrylate monomers with hydroxy groups provide strong chemical adhesion to substrates. This local differentiation of material properties within the same adhesive composition enables simultaneous achievement of high flexural adhesiveness and strong adhesion strength.
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 forms an adhesive member with high flexibility and durability, ensuring reliable adhesion and stability at both high and low temperatures, even during repeated folding or bending, without the need for plasticizers or organic solvents, thus enhancing the operational reliability of flexible display devices.
Implementation Method 1
the resin composition may have a glass transition temperature in a range of about −50° C. to about 0° C. after the resin composition is cured
Implementation Method 2
the resin composition may have a viscosity in a range of about 5 mPa·s to about 50 mPa·s at a temperature in a range of about 30° C. to about 50° C.
Data Source
AI summary
A resin composition may include a (meth)acrylate (A) comprising a hydroxy group and having a molecular weight of about 500 or less, and a polymer (B) comprising polyisoprene or polybutadiene as a main skeleton, having at least one radical reactive group in one molecule, and having a molecular weight in a range of about 2,000 to about 35,000, wherein the resin composition has a glass transition temperature in a range of about −50° C. to about 0° C. after the resin composition is cured, and the resin composition has a viscosity in a range of about 5 mPa·s to about 50 mPa·s at a temperature in a range of about 30° C. to about 50° C.