Pressure-Sensitive Adhesive for Foldable Displays
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Solution Overview
Problem
Conventional pressure-sensitive adhesives for foldable displays face challenges in maintaining bending reliability and adhesive force, as reducing the content of substances imparting adhesive force to achieve suitable storage elastic modulus leads to decreased adhesive force, and existing solutions fail to balance these properties effectively over a wide temperature range.
Innovation Solution
A pressure-sensitive adhesive composition comprising a first silicone gum with controlled MQ resin content and a second silicone gum, along with a borane or borate additive, is formulated to maintain storage elastic modulus within a suitable range, ensuring both folding reliability and high adhesive and cohesive forces, suitable for foldable displays that can be repeatedly folded and unfolded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the content of substances imparting adhesive force is reduced to achieve suitable storage elastic modulus, then the storage elastic modulus is improved, but the adhesive force decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the content of MQ resin (0.1-10 parts by weight per 100 parts by weight of silicone gum) and the molecular weight distribution of silicone gum to achieve the optimal balance between storage elastic modulus and adhesive force. This quantitative parameter optimization resolves the contradiction by finding the specific compositional range where both properties are satisfied simultaneously
Solution Approach 2:
The patent uses composite materials by combining different types of silicone gum (varying molecular weights and structures) with controlled amounts of MQ resin to create a pressure-sensitive adhesive composition that achieves both appropriate storage elastic modulus and high adhesive force. The composite structure of multiple silicone gum components with different properties enables simultaneous optimization of both contradictory parameters
2Reliability
If the storage elastic modulus is maintained within appropriate range for bending reliability, then the folding reliability is improved, but the adhesive force of the pressure-sensitive adhesive decreases
Solution Approach 1:
The patent resolves this contradiction through parameter changes by controlling the storage elastic modulus within the specific range of 10^5 to 10^7 Pa at 25°C through optimized composition design. This parameter control enables the adhesive to maintain both folding reliability and sufficient adhesive force by finding the optimal modulus range that satisfies both requirements
3Strength
If the pressure-sensitive adhesive force is increased to ensure adequate adhesive force, then the adhesive force is improved, but the storage elastic modulus becomes too high for foldable displays
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight distribution of silicone gum and the precise content of MQ resin to achieve high adhesive force while maintaining storage elastic modulus below 10^7 Pa. The parameter optimization shows that adhesive force can be enhanced through compositional control without proportionally increasing storage elastic modulus
Solution Approach 2:
The patent uses partial action by incorporating only the necessary minimum amount of MQ resin (0.1-10 parts per 100 parts silicone gum) required to achieve adequate adhesive force, rather than using excessive amounts that would raise storage elastic modulus too high. This partial action approach achieves sufficient adhesive performance while keeping the storage elastic modulus within the acceptable range for foldable displays
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, and also excellent adhesive force and cohesive force.