Polysiloxane Acrylate Adhesive for Plastic OLED Panel Protection
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Solution Overview
Problem
Adhesive sheets with high initial adhesive strength pose challenges in removing bubbles and foreign substances, and when used in plastic organic light emitting displays, they can damage panels due to strong adhesion, especially when stored for long periods or exposed to elevated temperatures.
Innovation Solution
An adhesive composition comprising a (meth)acrylate-based resin and a polymer with a melting temperature of 45° C. or higher, formed by copolymerizing monofunctional polysiloxane and a monomer, which maintains low initial adhesive strength and stability over time, including at elevated temperatures, preventing damage to panels during the removal process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesive sheet with high adhesive strength is used to fix the base, then sufficient adhesive strength is obtained, but bubbles and foreign substances cannot be easily removed and re-adhesion becomes difficult
Solution Approach 1:
The adhesive sheet uses a pressure-sensitive adhesive layer with a specific glass transition temperature range (-50°C to 0°C) that allows its adhesive properties to change dynamically with temperature. At room temperature, it provides sufficient adhesion, but when heated to 50-150°C, the adhesive strength decreases enabling easy removal and re-adhesion
Solution Approach 2:
The invention changes the temperature parameter to control adhesive strength. By heating the adhesive sheet to a specific temperature range (50-150°C), the adhesive transitions from a high-strength state during bonding to a low-strength state during removal, resolving the contradiction between strong initial adhesion and easy subsequent removal
2Strength
If an adhesive sheet with high adhesive strength is used, then the base is securely fixed, but the adhesive strength increases over time and at elevated temperatures causing panel damage during removal
Solution Approach 1:
The pressure-sensitive adhesive layer exhibits dynamic adhesive behavior where strength increases during initial bonding for secure fixation, but can be reversed by heating to 50-150°C to reduce strength and enable damage-free removal, preventing the harmful effect of excessive adhesive strength over time and temperature
Solution Approach 2:
The invention applies preliminary anti-action by providing a thermal release mechanism that counteracts the increasing adhesive strength before removal is attempted. Heating the adhesive sheet beforehand reduces the adhesive strength, preventing panel damage during the removal process
3Ease of operation
If a pressure-sensitive adhesive with groove structure is used to reduce bubbles, then bubbles are readily removed, but adhesive strength decreases due to reduced adhered area
Solution Approach 1:
The invention changes the temperature parameter to compensate for the reduced adhered area caused by the groove structure. By heating to 50-150°C during removal, the adhesive strength is reduced enabling easy bubble and foreign substance removal despite the groove structure reducing the bonding area
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 composition ensures low and consistent adhesive strength, preventing panel damage and facilitating easy removal of adhesive sheets from plastic organic light emitting displays, even after prolonged storage or at elevated temperatures, while maintaining sufficient adhesion to secure the base.
Implementation Method 1
a polymer having a melting temperature (Tm) of 45° C. or higher
Data Source
AI summary
An adhesive composition, an adhesive film comprising the same, a backplate film comprising the adhesive film, and a plastic organic light emitting display comprising the adhesive film are provided. The adhesive composition includes a (meth)acrylate-based resin, and a polymer having a melting temperature (Tm) of 45° C. or higher, wherein the polymer is a copolymer of a monofunctional polysiloxane and one type of monomer.