Acrylate Pressure-Sensitive Adhesive for Display Laminates
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Solution Overview
Problem
Conventional optical pressure-sensitive adhesives face challenges in maintaining excellent adhesion and preventing bubbles or liftings between laminated layers, especially when exposed to high temperatures, due to defects and thermal shrinkage in display and transparent electrode products.
Innovation Solution
A pressure-sensitive adhesive composition comprising a specific ratio of chain type alkyl acrylate, cyclic alkyl acrylate, and hydroxy group containing acrylate compounds, which form a cured product with controlled glass transition temperature, surface tension, and gel fraction to ensure durability, adhesiveness, and resistance to heat and light, minimizing bubble occurrence and covering step differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a high crosslinking density and glass transition temperature are achieved by introducing excessive crosslinking agent and high thermal stability monomer, then stability in high temperature and thermal shock is improved, but bubble occurrence and lifting between laminated layers still occur
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using specific monomers (acrylonitrile content 5-30 wt%, hydroxyl value 10-50 mg KOH/g) and controlling crosslinking density (gel fraction 30-70%) to achieve both high-temperature stability and bubble prevention. This resolves the contradiction by finding optimal parameter values that satisfy both requirements simultaneously.
Solution Approach 2:
The patent creates a composite adhesive system combining multiple components: acrylonitrile-containing polymer, hydroxyl-containing polymer, crosslinking agent, and monomer. This composite approach allows the material to exhibit both thermal stability from the crosslinked structure and bubble resistance from the specific monomer selection, resolving the contradiction between stability and bubble occurrence.
2Ease of manufacture
If the adhesive is designed to cover step differences and defects, then wettability and adhesion to uneven surfaces are improved, but the risk of bubble formation increases
Solution Approach 1:
The patent adjusts the surface tension and viscosity parameters of the adhesive formulation to optimize wettability while controlling bubble formation. By selecting specific monomers and controlling crosslinking conditions, the adhesive achieves good wetting of uneven surfaces without trapping excessive air bubbles, resolving the contradiction between ease of manufacture and bubble formation.
3Strength
If the adhesive maintains excellent pressure-sensitive adhesive strength, then bonding durability is improved, but the flexibility to accommodate thermal expansion and contraction is reduced
Solution Approach 1:
The patent optimizes the glass transition temperature and crosslinking density parameters to achieve the right balance between strength and flexibility. By controlling gel fraction (30-70%) and selecting appropriate monomers, the adhesive maintains strong bonding while having sufficient flexibility to accommodate thermal expansion and contraction, resolving the contradiction between strength and thermal flexibility.
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 composition effectively maintains adhesion and prevents bubbles or liftings between laminated layers even at high temperatures, ensuring durability and adhesiveness while providing excellent light and heat resistance.
Implementation Method 1
a pressure-sensitive adhesive composition comprising a chain type alkyl acrylate compound, a cyclic alkyl acrylate compound and a hydroxy group containing acrylate compound
Implementation Method 2
forming a cured product with controlled glass transition temperature, surface tension, and gel fraction to ensure durability, adhesiveness
Implementation Method 3
the phenomenon of bubble occurrence or lifting between laminated layers is still occurred when the product is left in a high-temperature environment for a long time
Data Source
AI summary
The present invention provides a specific acrylate compound component for a pressure-sensitive adhesive composition where it has excellent wettability, light resistance, and heat resistance. Moreover, it provides the pressure-sensitive adhesive composition which can cover step differences and defects and can minimize air bubbles or liftings between laminated layers while satisfying fundamentally required physical properties such as durability and pressure-sensitive adhesive. Especially, it provides the pressure-sensitive adhesive composition capable of minimizing air bubbles or liftings between laminated layers while satisfying fundamentally required physical properties such as durability and pressure-sensitive adhesive even when left at high temperature for a long time. It also provides an optical pressure-sensitive adhesive product which can cover defects located between laminated layers for a display module or a transparent electrode product.