Pressure Sensitive Adhesive for Flexible OLED Protection
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Solution Overview
Problem
In the fabrication of flexible OLED displays, there is a need for a pressure sensitive adhesive composition that provides low initial adhesion and high adhesion stability over time to prevent delamination and surface damage, while also ensuring low migration to maintain a clean surface for subsequent lamination processes.
Innovation Solution
A pressure sensitive adhesive composition comprising 85-100 parts of alkenyl-containing polydialkylsiloxane, 0-15 parts of polyalkylsiloxane resin, 0.1-5 parts of polyalkylhydrogensiloxane, 0.01-0.5 parts of acetylenic alcohol, and a platinum group metal catalyst, with a specific molar ratio of silicon bonded hydrogen to alkenyl groups, applied to a substrate and cured to form a film with low adhesion and high stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a protective film with low adhesion is used, then delamination is prevented during release, but adhesion stability over time deteriorates (adhesion increases with time causing delamination or damage)
Solution Approach 1:
The patent modifies the chemical composition parameters of the pressure-sensitive adhesive by incorporating specific siloxane structures and controlling the ratio of silicon-bonded hydrogen to alkenyl groups (SiH/Vi ratio of 0.5 to 2), thereby achieving both low initial adhesion and high adhesion stability over time without delamination
Solution Approach 2:
The patent uses a composite adhesive system combining alkenyl-containing polydialkylsiloxane with polyalkylhydrogensiloxane and acetylenic alcohol, creating a multi-component material that simultaneously provides low initial adhesion for easy release and high adhesion stability to prevent delamination during fabrication
2Reliability
If adhesive is applied to protect layers, then protection during fabrication is achieved, but migration occurs leaving residual adhesive on surfaces (affecting subsequent lamination)
Solution Approach 1:
The patent controls the chemical structure parameters of the siloxane adhesive, specifically the SiH/Vi ratio and the use of acetylenic alcohol, to minimize adhesive migration while maintaining protective function, ensuring clean surfaces for subsequent lamination processes
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 achieves initial adhesion suitable for protection during OLED fabrication, maintains stability without significant adhesion increase, and minimizes residual adhesive, ensuring clean surfaces for subsequent processing steps.
Implementation Method 1
an amount of a platinum group metal catalyst sufficient to provide 10 to 5000 ppm concentration of platinum group metal in the composition
Implementation Method 2
a molar ratio of silicon bonded hydrogen atoms to silicon bonded alkenyl groups (SiH/Vi ratio) of 0.5 to 2
Data Source
AI summary
A pressure sensitive adhesive composition can cure via hydrosilylation to form a pressure sensitive adhesive. The pressure sensitive adhesive composition may be coated on a substrate and cured to form a protective film. The protective film is useful in flexible OLED device fabrication processes, e.g., for protection of passivation layers.