Foldable Display Adhesive Composition for Bending Reliability
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Solution Overview
Problem
Conventional pressure-sensitive adhesives for foldable displays face challenges in maintaining bending reliability and adhesive force while ensuring a suitable storage elastic modulus over a wide temperature range, leading to issues with release peeling from fluorine-based release films.
Innovation Solution
A pressure-sensitive adhesive composition comprising a blend of a first silicone gum-based low-pressure-sensitive adhesive and a second silicone gum-based high-pressure-sensitive adhesive, with specific ratios and molecular weights, to achieve a storage elastic modulus of 5.0×10^6 Pa or less over −40° C. to 90° C., and a peel force of 20 gf/in or less on fluorine-based release films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage elastic modulus is reduced to improve bending reliability, then the adhesive force to the release film increases excessively, but the release peeling becomes difficult
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure-sensitive adhesive by incorporating specific components (silicone gum, MQ resin, crosslinking agent) and controlling their ratios to achieve a storage elastic modulus of 5.0×10^6 Pa or less while maintaining controlled adhesive force to the fluorine-based release film, enabling both bending reliability and release capability
Solution Approach 2:
The patent uses a composite pressure-sensitive adhesive system combining multiple materials (silicone gum base, MQ resin, crosslinking agent) that work together to simultaneously achieve low storage elastic modulus for bending reliability and appropriate adhesive force for release film detachment
2Reliability
If the storage elastic modulus is maintained low over wide temperature range, then the bending reliability is improved, but the adhesive force and cohesive force may be compromised
Solution Approach 1:
The patent optimizes the chemical composition parameters including the types and ratios of silicone gum, MQ resin content, and crosslinking agent to achieve a storage elastic modulus of 5.0×10^6 Pa or less across -40°C to 90°C while maintaining sufficient adhesive and cohesive forces for foldable display application
Solution Approach 2:
The patent creates different local properties within the adhesive system where the base composition provides low storage elastic modulus for bending reliability while specific additives and crosslinking structures provide localized adhesive and cohesive strength where needed
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 provides excellent bending reliability, adhesive force, and cohesive force, while maintaining a stable storage elastic modulus and reducing the release peeling force, ensuring the integrity and flexibility of foldable displays across various temperatures.
Implementation Method 1
the pressure-sensitive adhesive composition according to the present invention has a storage elastic modulus of not more than 5.0×10^6 Pa after curing over a wide temperature interval, for example, a temperature interval of −40° C. to 90° C.
Implementation Method 2
the pressure-sensitive adhesive composition according to the present application can form a pressure-sensitive adhesive layer having suitable releasing peel force to the fluorine-based release film
Data Source
AI summary
The present application relates to a pressure-sensitive adhesive composition for a foldable display and a use thereof.The pressure-sensitive adhesive composition of the present application has excellent bending reliability while having appropriate adhesive force and cohesive force, thereby being useful for forming a pressure-sensitive adhesive layer for a foldable display having improved release force.