Acrylic Adhesive Composition for Display Bubble Penetration
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Solution Overview
Problem
Display apparatuses face challenges with adhesive compositions that are prone to bubble penetration, especially in bending areas, leading to reliability issues and increased defect rates due to gas aggregation during high-pressure and high-temperature processes.
Innovation Solution
An adhesive composition comprising (meth)acrylates with specific weight percentages, including low-temperature glass transition (meth)acrylate, alicyclic (meth)acrylate, cross-linkable (meth)acrylate, (meth)acrylate with a hydroxyl group, and a reactive dilution monomer, along with a photopolymerization initiator, which forms a cured product with an elastic modulus of 50,000 Pa or greater at 60°C and a maximum time-varying stress of 10,000 Pa or less at 70°C, minimizing bubble penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive compositions are used to bond display panel and cover window, then adhesion and optical properties are achieved, but bubble penetration occurs especially in bending areas leading to reliability issues
Solution Approach 1:
The patent changes the physical and chemical parameters of the adhesive composition by selecting specific (meth)acrylate monomers with controlled glass transition temperatures (40°C or less), incorporating alicyclic groups, hydroxyl groups, and cross-linkable functional groups. This composition design achieves an elastic modulus of 50,000 Pa or greater at 60°C, which prevents bubble penetration while maintaining adhesion and optical properties
Solution Approach 2:
The patent creates a composite adhesive system by combining multiple (meth)acrylate monomers with different functional groups (alicyclic, hydroxyl, cross-linkable) in specific weight ratios. This composite composition synergistically achieves both the required adhesion strength and the elastic modulus necessary to prevent bubble penetration, particularly in bending areas of the display apparatus
2Strength
If adhesive composition is subjected to high-pressure and high-temperature processes, then bonding strength is improved, but gas aggregates form causing defects
Solution Approach 1:
The patent modifies the thermal and mechanical parameters of the adhesive by incorporating monomers with specific glass transition temperatures and functional groups. The resulting composition maintains optimal viscosity and bubble release characteristics during high-pressure and high-temperature lamination processes, achieving strong bonding without gas aggregation defects
3Reliability
If adhesive composition uses higher elastic modulus to prevent bubble penetration, then reliability improves, but stress resistance may be compromised
Solution Approach 1:
The patent optimizes the elastic modulus parameter to be 50,000 Pa or greater at 60°C through careful selection of (meth)acrylate monomers. This parameter range provides sufficient structural integrity to prevent bubble penetration while maintaining stress resistance in bending areas, achieving a balance between reliability and flexibility
Solution Approach 2:
The patent applies different functional groups in specific weight ratios within the adhesive composition to create localized properties: alicyclic groups provide structural rigidity for bubble prevention, while hydroxyl and cross-linkable groups provide adhesion and stress resistance. This local quality distribution within the composite material resolves the contradiction between elastic modulus and stress resistance
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 composition significantly reduces bubble penetration and enhances the reliability of display apparatuses by maintaining structural integrity and reducing defect rates, even in bending areas, through improved elastic modulus and stress resistance.
Implementation Method 1
the adhesive composition may further include a photopolymerization initiator, and the photopolymerization initiator may include 2-hydroxy-2-methyl-1-phenyl-propan-1-one
Data Source
AI summary
An adhesive composition includes (meth) acrylate having a glass transition temperature of 40° C. or less, (meth)acrylate having an alicyclic group, cross-linkable (meth)acrylate, (meth)acrylate having a hydroxyl group, and reactive dilution monomer, wherein a cured product of the adhesive composition has an elastic modulus of about 50,000 Pa or greater at a temperature of 60° C.