Acrylic Pressure-Sensitive Adhesive for Optical Use
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional acrylic pressure-sensitive adhesives for optical use can corrode transparent electrodes in display devices, leading to deterioration in touch panel function, and lack sufficient adhesiveness and foaming resistance in various environments.
Innovation Solution
An acrylic pressure-sensitive adhesive composition comprising a vinyl monomer with a nitrogen atom in its backbone and a (meth)acrylic polymer with a weight average molecular weight of 1000 to 30000, which is free from carboxyl group-containing monomers, enhancing transparency, adhesiveness, and reducing corrosiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an acrylic pressure-sensitive adhesive containing a carboxyl group (such as acrylic acid) is used for attachment between touch panel and image display panel or protective panel, then adhesiveness is improved, but corrosiveness to transparent electrode increases
Solution Approach 1:
The invention extracts and removes the harmful carboxyl group-containing monomer component from the acrylic pressure-sensitive adhesive composition. By formulating the adhesive without carboxyl group-containing monomers, the corrosiveness to the transparent electrode (ITO) is eliminated while maintaining adhesiveness through alternative polymer components and formulations.
Solution Approach 2:
The invention changes the chemical composition parameters of the acrylic pressure-sensitive adhesive by specifying monomer ratios and excluding carboxyl group-containing monomers. This parameter change transforms the adhesive from a corrosive formulation to a non-corrosive one while preserving bonding performance.
2Illumination intensity
If conventional acrylic pressure-sensitive adhesive is used for optical use, then transparency is achieved, but foaming resistance and adhesiveness in various environments are insufficient
Solution Approach 1:
The invention creates a composite adhesive system combining acrylic polymer with specific molecular weight ranges (1000-30000) and controlled monomer compositions. This composite formulation achieves both optical transparency and enhanced reliability in terms of foaming resistance and adhesiveness across various environmental conditions including high temperature and high humidity.
Solution Approach 2:
The invention optimizes physical parameters of the acrylic polymer including molecular weight (1000-30000 range) and monomer composition ratios. These parameter changes simultaneously improve transparency by controlling light scattering and enhance foaming resistance and environmental adhesiveness by adjusting polymer chain structure and intermolecular forces.
Data Source
AI summary
An acrylic pressure-sensitive adhesive composition for optical use includes: an acrylic polymer (A) that contains, as a monomer unit, a vinyl monomer having a nitrogen atom in its backbone and that does not substantially contain a carboxyl group-containing monomer; and a (meth)acrylic polymer (B) having a weight average molecular weight of 1000 or more and less than 30000.