Surface Protective Film Adhesive Layer Composition for Flexible Displays
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Solution Overview
Problem
Existing surface protective films for flexible displays face challenges in achieving low adhesive residue and preventing contamination of the adherend during the manufacturing process of organic light-emitting electronic devices, as the use of plasticizers to reduce adhesive strength leads to migration issues and surface contamination.
Innovation Solution
A surface protective film with a base layer and an adhesive layer composed of a cured product of a urethane polymer, acrylic polymer, and curing agent, which provides a residual adhesion rate of 80% or more, ensuring low peel strength and minimal adhesive residue upon removal, thereby minimizing damage and contamination to the adherend.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plasticizer is added to reduce adhesive strength, then low adhesive strength is achieved, but adhesive residue increases due to plasticizer migration
Solution Approach 1:
The invention changes the chemical composition parameters of the adhesive layer by incorporating specific functional polymers (polyester polymer with carboxyl groups, polyacrylic polymer with carboxyl groups) and metal oxide nanoparticles. This compositional parameter change enables the adhesive to achieve low strength without relying on plasticizers, thereby preventing migration and residue formation.
Solution Approach 2:
The adhesive layer is formulated as a composite material containing polyester polymer, polyacrylic polymer, metal oxide nanoparticles (such as ZnO, TiO2, SiO2), and crosslinking agents. This composite structure provides the desired adhesive properties while eliminating the need for plasticizers, thus preventing residue contamination.
2Strength
If adhesive strength is reduced for easy removal, then peel strength decreases, but damage to the adherend may increase
Solution Approach 1:
The invention optimizes the adhesive composition parameters including the weight ratios of polyester polymer (10-50 parts), polyacrylic polymer (10-50 parts), and metal oxide nanoparticles (1-10 parts). These parameter optimizations ensure the adhesive has appropriate peel strength for easy removal while maintaining integrity and preventing damage to the encapsulation layer.
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 solution effectively reduces adhesive residue and prevents contamination of the adherend, ensuring the integrity and cleanliness of the surface during the manufacturing process of organic light-emitting electronic devices.
Implementation Method 1
the adhesive layer includes a cured product of an adhesive composition including: a urethane polymer; an acrylic polymer; and a curing agent
Data Source
AI summary
The present application relates to a surface protective film and a method for manufacturing an organic light emitting electronic device.