Display Adhesive Composition for Low-Temperature Rework
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Solution Overview
Problem
Existing adhesive resins for display devices face issues with bubbles and foreign materials during application, leading to discarding and a need for improved adhesiveness and reworkability, especially in devices with complex shapes.
Innovation Solution
An adhesive member composed of a resin composition containing urethane (meth)acrylate oligomers, polyfunctional (meth)acrylate monomers, and a photoinitiator, with specific weight percentages and glass transition temperatures, allowing for low-temperature rework and high adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive resin is applied to display device members, then adhesion strength is improved, but bubbles and foreign materials are incorporated causing defects
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive resin by incorporating specific ratios of flexible segment-containing polymers and controlling molecular weight distributions. This parameter optimization enables the adhesive to maintain high adhesion strength while reducing bubble formation and foreign material incorporation during the bonding process.
Solution Approach 2:
The adhesive resin is formulated as a composite material system combining multiple polymer components with different functional characteristics. This composite structure allows the adhesive to simultaneously achieve strong bonding, bubble resistance, and ease of rework by leveraging the synergistic effects of its constituent materials.
2Strength
If adhesive resin is used for display devices, then adhesion is improved, but reworkability at low temperature deteriorates
Solution Approach 1:
The patent carefully controls the glass transition temperature parameter of the adhesive resin by selecting specific polymer components and their ratios. This parameter adjustment enables the adhesive to maintain strong adhesion at operating temperatures while becoming sufficiently soft and reworkable at low temperatures (around -40°C) for repair operations.
Solution Approach 2:
The adhesive resin exhibits dynamic mechanical properties that change with temperature. At room temperature, it provides strong adhesion, while at low temperatures, its molecular mobility increases, enabling easy rework and removal without damage to the bonded components.
3Area of stationary object
If adhesive resin is applied to complex shaped members, then bonding coverage is improved, but coatability and positioning accuracy deteriorate
Solution Approach 1:
The adhesive resin forms a flexible, thin film that can conform to complex geometries of display device members. This flexible film structure allows the adhesive to achieve complete bonding coverage on irregular surfaces while maintaining precise positioning through its controlled flow characteristics and adhesion 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 adhesive member provides excellent adhesiveness and reworkability at room temperature, ensuring reliable attachment and detachment of display device components without damage, even in complex shapes.
Implementation Method 1
a polymer derived from a resin composition including at least one urethane (meth)acrylate oligomer including two (meth)acryloyl groups per oligomer unit, at least one polyfunctional (meth)acrylate monomer including multiple (meth)acryloyl groups per monomer unit, and at least one photoinitiator
Data Source
AI summary
An adhesive member of may include a polymer derived from a resin composition including at least one urethane (meth)acrylate oligomer including two (meth)acryloyl groups per oligomer unit, at least one polyfunctional (meth)acrylate monomer including multiple (meth)acryloyl groups per monomer unit, and at least one photoinitiator. The weight of the urethane (meth)acrylate oligomer may be 1 wt % or more and less than 10 wt %, and the weight of the polyfunctional (meth)acrylate monomer may be 0.2 wt % or more and less than 2 wt %, based on a total weight of the resin composition. The glass transition temperature of the adhesive member may be −10° C. or more and less than 10° C., and the loss tangent (tan δ) of the adhesive member at −40° C. may be 0.01 or more and less than 0.3. Accordingly, the adhesive member may undergo easy rework at −40° C. and show excellent or suitable adhesion reliability during use.