Transparent Substrate with Resin Layer for Solvent Crack Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transparent substrates used in display devices and solar cells face challenges with solvent durability, toughness, and heat resistance, particularly when exposed to solvents like acetone, leading to solvent cracks and insufficient impact resistance.
Innovation Solution
A transparent substrate is developed with an inorganic glass layer coated on both sides with a resin layer containing a specific resin compound with a weight-average molecular weight of 8×10^4 to 100×10^4, featuring a specific molecular structure and a coupling agent layer for enhanced adhesion and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a resin layer is formed on glass surface to improve flexibility and handleability, then weight reduction and flexibility are achieved, but solvent durability deteriorates and solvent cracks occur
Solution Approach 1:
The patent changes the molecular weight parameter of the resin compound to a specific range (8×10^4 to 100×10^4) to simultaneously achieve flexibility and solvent durability. This parameter optimization allows the resin layer to maintain both mechanical flexibility for handleability and chemical resistance against solvents during display device manufacturing.
Solution Approach 2:
The patent creates a composite structure by forming a resin layer on the glass substrate surface. This composite material combines the mechanical strength and rigidity of glass with the flexibility and solvent resistance properties of the specially formulated resin compound, resolving the contradiction between handleability and solvent durability.
2Weight of moving object
If glass substrate is thinned to achieve weight reduction, then weight decreases and flexibility improves, but impact resistance becomes insufficient
Solution Approach 1:
The patent employs a composite structure combining thin glass substrate with a resin layer. The resin layer acts as a protective coating that enhances impact resistance while allowing the glass to remain thin for weight reduction. This composite approach enables the substrate to achieve both lightweight and high impact resistance properties.
Solution Approach 2:
The resin layer serves as a pre-applied protective cushion on the glass surface that absorbs and distributes impact forces before they can cause damage to the thin glass substrate. This beforehand cushioning effect allows the thin glass to maintain sufficient impact resistance despite its reduced thickness.
3Ease of operation
If conventional resin layer is used to provide flexibility, then flexibility is achieved, but heat resistance becomes insufficient
Solution Approach 1:
The patent optimizes the molecular weight parameter of the resin compound to a specific high range (8×10^4 to 100×10^4), which simultaneously improves both flexibility and heat resistance. This parameter change ensures the resin layer maintains its mechanical flexibility while exhibiting sufficient thermal stability for display device manufacturing processes.
Data Source
Figure 1(a)~1(c)
AI summary
The present invention provides a transparent substrate excellent in solvent crack resistance, toughness, heat resistance, and flexibility. A transparent substrate according to an embodiment of the present invention includes: an inorganic glass; and a first resin layer placed on at least one side of the inorganic glass, wherein: the first resin layer contains a resin compound having a weight-average molecular weight in terms of polystyrene of 8×104 to 100×104; and no solvent crack occurs when a mixed solvent containing 20 wt% to 95 wt% of at least one kind of solvent selected from the group consisting of acetone, N-methylpyrrolidone, dimethyl sulfoxide, and N,N-dimethylformamide is brought into contact with the substrate.