Poly(imide-amide) Copolymer for Flexible Display Substrates
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Solution Overview
Problem
There is a need for new polymeric materials with high transmittance for light and low yellowness index (YI) to replace conventional window cover glass in flexible display devices, as existing materials do not adequately meet these requirements.
Innovation Solution
A composition for preparing a poly(imide-amide) copolymer is developed, involving the reaction of a tetracarboxylic acid dianhydride, a diamine, and a carboxylic acid dichloride, followed by the removal of hydrochloric acid and addition of an acid anhydride and solvent, which reduces the terminal amino group content and yellowness index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional window cover glass is used in flexible display devices, then structural strength is maintained, but weight increases and flexibility is reduced
Solution Approach 1:
The patent changes the material parameters by developing a poly(imide-amide) copolymer with specific chemical composition (using tetracarboxylic acid dianhydride, diamine, and carboxylic acid dichloride) that achieves both reduced density (weight) and maintained mechanical strength, enabling flexible display applications
Solution Approach 2:
The patent creates a composite polymer structure through copolymerization of multiple components (tetracarboxylic acid dianhydride, diamine, carboxylic acid dichloride) to achieve a material that simultaneously provides structural strength, flexibility, and low weight for display device substrates
2Adaptability or versatility
If polymeric materials are used to replace window cover glass, then weight is reduced and flexibility is improved, but transmittance and yellowness index performance deteriorates
Solution Approach 1:
The patent optimizes optical parameters by controlling the chemical structure of the poly(imide-amide) copolymer, specifically adjusting the ratios of tetracarboxylic acid dianhydride, diamine, and carboxylic acid dichloride to achieve high light transmittance and appropriate yellowness index while maintaining flexibility
Solution Approach 2:
The patent introduces specific functional groups and molecular structures at localized regions of the polymer chain (through selection of specific diamine and carboxylic acid dichloride components) to enhance light transmittance properties in critical areas while maintaining overall material flexibility
3Adaptability or versatility
If polymeric materials are used to replace window cover glass, then weight is reduced and flexibility is improved, but yellowness index increases
Solution Approach 1:
The patent controls the yellowness index parameter by optimizing the chemical composition ratios of the copolymer components, specifically adjusting the amounts of tetracarboxylic acid dianhydride, diamine, and carboxylic acid dichloride to minimize yellowing while maintaining flexibility and processability
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 resulting poly(imide-amide) copolymer exhibits improved optical and mechanical properties, with reduced yellowness index and increased transmittance, making it suitable for use as a transparent substrate in flexible display devices.
Implementation Method 1
a copolymer obtained by reacting a tetracarboxylic acid dianhydride represented by Chemical Formula 1, a diamine represented by Chemical Formula 2, and a carboxylic acid dichloride to form a reaction product
Data Source
AI summary
A composition for preparing an article including a poly(imide-amide) copolymer, the composition including (i) a copolymer obtained by reacting a tetracarboxylic acid dianhydride represented by Chemical Formula 1, a diamine represented by Chemical Formula 2, and a carboxylic acid dichloride to form a reaction product, followed by removing hydrochloric acid from the reaction product, (ii) an acid anhydride, and (iii) a solvent:Wherein group R1 in Chemical Formula 1 and group R2 in Chemical Formula 2 are the same as described in the specification.