Polyamideimide Resin for Flexible Display Front Plates
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Solution Overview
Problem
Current image display apparatuses, particularly flexible displays, face challenges with constituent members like front plates that require both high flexibility and bending resistance to prevent damage and maintain visibility when bent, as traditional materials like glass are rigid and fragile.
Innovation Solution
A polyamideimide resin with specific constitutional units, such as those represented by formulas (1) and (2), is developed, which offers a balance of high flexibility and bending resistance, suitable for use in optical members and front plates of image display apparatuses, with a glass transition temperature below 380°C and a content ratio of constitutional units that enhance surface hardness and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass is used as the front plate material, then transparency and hardness are improved, but flexibility and bending resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the glass transition temperature (Tg) of the polyamideimide resin to be 250°C or lower, and by precisely controlling the content ratio of constitutional units (formula 3 at 3-90 mol%, formula 4 at 10-90 mol%). These parameter adjustments enable the resin to achieve both flexibility and bending resistance, resolving the contradiction between hardness and flexibility that plagues traditional glass materials.
Solution Approach 2:
The patent employs composite material principles by creating a polyamideimide resin with a specific composition of different constitutional units (formulas 1-5). This composite molecular structure combines rigid aromatic rings for heat resistance with flexible aliphatic chains for bendability, achieving a balance between hardness and flexibility that glass alone cannot provide.
2Adaptability or versatility
If the front plate is made flexible to enable bending, then adaptability is improved, but bending resistance and surface integrity deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing the glass transition temperature parameter to 250°C or lower, which provides sufficient flexibility for bending while maintaining structural integrity. Additionally, the controlled composition ratios of constitutional units (formula 3: 3-90 mol%, formula 4: 10-90 mol%) ensure that the flexible structure does not compromise bending resistance, allowing the front plate to withstand repeated bending without damage or wrinkle formation.
3Adaptability or versatility
If polyamideimide resin is used to replace glass, then flexibility is improved, but surface hardness and processing properties deteriorate
Solution Approach 1:
The patent addresses this contradiction through precise parameter control: the glass transition temperature is set at 250°C or lower to ensure flexibility, while the content ratio of constitutional unit (formula 3) is controlled at 3-90 mol% and (formula 4) at 10-90 mol% to maintain surface hardness. This dual parameter optimization allows the resin to exhibit both flexibility and adequate surface hardness, overcoming the limitations of conventional polyamideimide resins.
Solution Approach 2:
The patent uses composite material principles by incorporating multiple types of constitutional units (formulas 1-5) in specific proportions. This composite molecular architecture combines rigid aromatic structures for surface hardness with flexible linkages for bendability, achieving a balance between surface hardness and flexibility that single-structure polymers cannot attain.
Data Source
AI summary
An object of the present invention is to provide a polyamideimide resin for an optical member having both high flexibility and bending resistance, and in particular, a polyamideimide resin for a front plate of an image display apparatus, and an optical member such as a front plate containing the polyamideimide resin.A polyamideimide resin having constitutional units represented by formula (1) and formula (2):in formula (1) and formula (2), X and Z each independently represent a divalent organic group,Y represents a tetravalent organic group, andat least a part of Z is constitutional unit represented by formula (3):in formula (3), R1 to R8 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and the hydrogen atoms contained in R1 to R8 may be each independently substituted with a halogen atom,A represents —O—, —S—, —CO— or —NR9—, and R9 represents a hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom,m is an integer of 1 to 4, and* represents a bonding hand.