Core-Shell Nanoparticle Adhesive Film for Bubble-Free Display Bending
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Solution Overview
Problem
Existing adhesive films for optical displays and touchscreens suffer from issues such as bubble generation and detachment during repetitive bending, leading to reliability concerns and reduced lifespan.
Innovation Solution
An adhesive film composed of a monomer mixture including hydroxyl group-containing (meth)acrylate and a comonomer, with nanoparticles of specific particle sizes and core-shell structures, achieving a recovery rate of 40% to 99% and zero bubble generation, along with a haze of 4% or less, ensuring durability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive films are used in optical displays and touchscreens, then initial bonding is achieved, but bubble generation and detachment occur during repetitive bending, reducing reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive film by incorporating hydroxyl group-containing (meth)acrylate (5-40 wt%) and specific comonomers to achieve both high reliability and extended service lifespan. The controlled composition ratios enable the adhesive to maintain bonding strength through 100,000+ bending cycles while preventing bubble generation.
Solution Approach 2:
The adhesive film uses a composite material system combining hydroxyl group-containing (meth)acrylate, comonomers, and nanoparticles (5-400 nm) to simultaneously achieve zero bubble generation and high durability during repetitive bending. The composite structure provides both immediate bonding and long-term reliability.
2Strength
If adhesive film composition is optimized for bonding strength, then adhesion is improved, but bubble generation increases
Solution Approach 1:
The patent precisely controls the composition parameters: hydroxyl group-containing (meth)acrylate at 5-40 wt%, specific comonomers at 60-95 wt%, and nanoparticle addition to achieve both strong adhesion and zero bubble generation. This parameter optimization eliminates the trade-off between bonding strength and bubble formation.
Solution Approach 2:
The patent uses nanoparticles (5-400 nm) as a model system to achieve uniform distribution and prevent bubble formation while maintaining strong adhesion. The nanoparticles act as a template for uniform material distribution, preventing void formation during bonding.
3Duration of action of stationary object
If adhesive film is made more flexible to withstand bending, then durability during bending is improved, but transparency decreases
Solution Approach 1:
The patent optimizes the glass transition temperature parameters and composition ratios to achieve flexible bending durability while maintaining transparency. The specific comonomer selection and nanoparticle size control (5-400 nm) ensure the adhesive remains optically clear even after 100,000+ bending cycles.
Solution Approach 2:
The patent applies local quality by using nanoparticles with specific size distribution (5-400 nm) that provide flexibility where needed while maintaining overall transparency. The core-shell nanoparticle structure provides localized mechanical reinforcement without compromising optical properties.
4Strength
If adhesive film thickness is increased to improve bonding strength, then adhesion is improved, but recovery rate decreases
Solution Approach 1:
The patent changes the material composition parameters rather than thickness to achieve bonding strength. The hydroxyl group-containing (meth)acrylate (5-40 wt%) and comonomer ratio (60-95 wt%) are optimized to provide strong adhesion while maintaining high recovery rate, eliminating the need to increase thickness.
Solution Approach 2:
The patent uses nanoparticles (5-400 nm) as a model system to achieve uniform distribution and prevent aggregation, which maintains recovery rate while providing bonding strength. The nanoparticle core-shell structure acts as a template for uniform material distribution.
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 film exhibits excellent reliability with minimal bubble formation and detachment, even after 100,000 cycles of bending, maintaining adhesion and transparency, suitable for flexible optical displays.
Implementation Method 1
a hydroxyl group-containing (meth)acrylic copolymer formed from a monomer mixture comprising a hydroxyl group-containing (meth)acrylate and a comonomer
Implementation Method 2
the adhesive film has a recovery rate of about 40% to about 99%, the recovery rate being determined according to Method A as described herein
Implementation Method 3
the adhesive film has a haze of about 4% or less according to ASTM D1003-95 for a specimen thickness of about 100 μm
Data Source
AI summary
An adhesive film and a display member, the adhesive film being formed of an adhesive composition that includes a monomer mixture comprising a hydroxyl group-containing (meth)acrylate and a comonomer, wherein the adhesive film has a recovery rate of about 40% to about 99%, the recovery rate being determined according to Method A as described herein, and wherein the adhesive film has a bubble generation area of about 0%, the bubble generation area being determined according to Method B as described herein.