Plasticizer-Free Adhesive Layer for Flexible Display Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing surface protective films for flexible displays face challenges in achieving low adhesive strength without using plasticizers, which can lead to surface contamination due to migration of plasticizers.
Innovation Solution
A surface protective film comprising a base layer and an adhesive layer made from a cured product of an adhesive composition including a urethane polymer, an acrylic polymer, and a curing agent, with a peel strength of 0.5 gf/in or more and 10 gf/in or less, ensuring low residue and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a plasticizer is added to reduce adhesive strength, then the peel strength decreases to desired levels, but the plasticizer migrates and causes surface contamination
Solution Approach 1:
The invention extracts and eliminates the plasticizer component from the adhesive composition. The adhesive layer is formulated without plasticizers, using alternative mechanisms (urethane polymer with acrylic polymer and curing agent) to achieve the desired low adhesive strength without the harmful migration and contamination effects that plasticizers cause.
Solution Approach 2:
The invention changes the chemical composition parameters of the adhesive layer by using a specific formulation of urethane polymer, acrylic polymer, and curing agent in controlled amounts. This parameter change allows achieving low peel strength (0.5-10 gf/in) through the inherent properties of the polymer composition and curing degree, rather than relying on plasticizer addition.
2Ease of operation
If the adhesive strength is reduced to enable easy removal, then the peel strength decreases allowing clean detachment, but residue and contamination of the adherend surface increases
Solution Approach 1:
The adhesive layer is designed as a temporary, disposable protective function. The surface protective film with the specially formulated adhesive layer serves its purpose during manufacturing and is then completely removed without leaving residue. The adhesive composition is optimized to provide sufficient temporary bonding during handling but complete clean removal afterward, eliminating the need for cleaning operations.
3Reliability
If existing barrier films are replaced, then new surface protective films are needed for TFE layer protection, but developing new films increases device complexity
Solution Approach 1:
The adhesive layer formulation serves multiple functions simultaneously: it provides adequate bonding strength to attach the surface protective film to the TFE layer, maintains low adhesive strength for easy removal, prevents contamination during the process, and ensures complete residue-free detachment. This multi-functionality is achieved through the synergistic combination of urethane polymer, acrylic polymer, and curing agent in specific proportions.
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 surface protective film effectively prevents damage and contamination of the adherend surface during and after detachment, maintaining low adhesive strength without using plasticizers.
Implementation Method 1
an adhesive layer provided on one surface of the base layer, wherein 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 disclosure relates to a surface protective film and a method for manufacturing an organic light emitting electronic device.