Foldable Display Adhesive Composition for Temperature-Resistant Folding
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Solution Overview
Problem
Current pressure-sensitive adhesives used in foldable displays do not adequately satisfy the requirements of excellent folding properties, adhesion, heat resistance, and recovery rate simultaneously, particularly at varying temperatures.
Innovation Solution
A pressure-sensitive adhesive composition comprising an acrylic polymer and a crosslinking agent, which satisfies specific ranges of storage modulus at different temperatures and frequencies, ensuring excellent folding properties, adhesion, and recovery rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pressure-sensitive adhesives are used in foldable displays, then folding properties can be achieved, but adhesion, heat resistance, and recovery rate requirements are not satisfied simultaneously
Solution Approach 1:
The patent modifies the adhesive composition by adjusting chemical parameters (incorporating specific ratios of acrylic polymer, crosslinking agent, and plasticizer) to achieve optimal performance across different temperatures. This parameter optimization enables the adhesive to maintain both folding reliability and adaptability across temperature ranges.
Solution Approach 2:
The patent creates a composite adhesive system combining multiple components (acrylic polymer, crosslinking agent, and plasticizer) in specific proportions. This composite formulation allows the adhesive to simultaneously satisfy folding properties, adhesion strength, heat resistance, and recovery rate requirements that cannot be achieved with single-component adhesives.
2Reliability
If adhesive composition is optimized for folding properties, then folding reliability is improved, but adhesion and heat resistance may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of adhesive components, specifically setting the crosslinking agent content at 0.1-10 parts by weight per 100 parts of acrylic polymer and plasticizer at 5-50 parts by weight per 100 parts of acrylic polymer. This parameter optimization achieves the right balance between folding reliability and adhesion strength.
Solution Approach 2:
The patent introduces different functional components with specific local functions: acrylic polymer provides base adhesion, crosslinking agent provides structural integrity for folding, and plasticizer provides flexibility and heat resistance. This local quality differentiation allows each component to optimize its specific function while contributing to overall performance.
3Strength
If adhesive composition is optimized for adhesion, then bonding strength is improved, but folding properties and recovery rate may deteriorate
Solution Approach 1:
The patent adjusts the chemical composition parameters by controlling the crosslinking degree and plasticizer content to maintain adhesion strength while enabling folding reliability. The specific ranges of crosslinking agent (0.1-10 parts) and plasticizer (5-50 parts) per 100 parts of acrylic polymer ensure both adhesion and folding performance are achieved simultaneously.
Solution Approach 2:
The patent assigns different functional roles to different components: acrylic polymer provides the adhesive bonding function, crosslinking agent provides the structural framework for folding resistance, and plasticizer provides the flexibility needed for folding. This functional differentiation allows adhesion strength and folding reliability to coexist.
4Stability of the object's composition
If adhesive composition is optimized for heat resistance, then thermal stability is improved, but folding properties and recovery rate may deteriorate
Solution Approach 1:
The patent optimizes the plasticizer content parameter (5-50 parts by weight per 100 parts of acrylic polymer) and crosslinking agent content (0.1-10 parts by weight per 100 parts of acrylic polymer) to achieve the right balance between heat resistance and folding reliability. This parameter optimization prevents the adhesive from becoming too rigid at elevated temperatures while maintaining folding capability.
Solution Approach 2:
The patent uses plasticizer as a specific component that provides thermal stability and flexibility locally within the adhesive matrix. This local quality enhancement allows the adhesive to maintain heat resistance without sacrificing folding reliability, as the plasticizer specifically addresses thermal behavior while the crosslinking agent maintains structural integrity.
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 achieves excellent folding properties, adhesion, and recovery rates across a range of temperatures, addressing the limitations of existing adhesives by maintaining performance in both low and high-temperature conditions.
Implementation Method 1
a crosslinking agent, which satisfies specific ranges of storage modulus at different temperatures and frequencies
Implementation Method 2
the storage modulus (Pa) of the pressure-sensitive adhesive composition after curing as measured at a temperature of −20° C. and a strain of 1%
Data Source
AI summary
Provided is a pressure-sensitive adhesive composition for a foldable display, more particularly, a pressure-sensitive adhesive composition for a foldable display which, by satisfying a specific range of storage modulus for each frequency at a temperature of 50° C. or more as well as at low temperature and room temperature, not only allows excellent folding properties to be realized but also satisfies excellent adhesion, excellent heat resistance, and excellent recovery rate requirements at the same time.