Oxetane-Cyclic Epoxy Composite for Display Substrate Thermal Stability
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Solution Overview
Problem
Conventional plastic substrates for displays face challenges with high thermal expansion coefficients, reduced flexibility, and compromised transparency due to their material properties, which affect the performance and durability of display substrates.
Innovation Solution
An oxetane-cyclic epoxy compound is developed and used as a binder in a composite sheet, combined with glass fillers, to enhance heat resistance, mechanical properties, and optical clarity, while maintaining flexibility and low viscosity, thereby forming a substrate with improved thermal stability and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plastic materials are used as substrates for displays to achieve small size, slimness, light weight, impact resistance and flexibility, then flexibility and impact resistance are improved, but thermal expansion coefficient increases and heat resistance deteriorates
Solution Approach 1:
The patent uses a composite material system consisting of a plastic substrate combined with a transparent resin coating layer containing oxetane-cyclic epoxy compound. This composite structure allows the substrate to maintain flexibility and impact resistance while the resin coating provides heat resistance and dimensional stability, resolving the contradiction between mechanical flexibility and thermal stability.
Solution Approach 2:
The patent modifies the thermal and mechanical parameters of the substrate by applying a resin coating with specific glass transition temperature (Tg ≥ 80°C) and controlled thickness (1-20 μm). This parameter change enables the substrate to achieve both flexibility and heat resistance by optimizing the resin's molecular structure and coating properties.
2Weight of moving object
If conventional plastic substrates are used to achieve light weight and flexibility, then weight and flexibility are improved, but transparency deteriorates due to material properties
Solution Approach 1:
The patent creates a composite structure where a transparent resin coating layer is applied over the plastic substrate. The resin contains oxetane-cyclic epoxy compound with high light transmittance, which compensates for the substrate's lower transparency while maintaining the lightweight advantage of plastic materials.
Solution Approach 2:
The patent applies a localized transparent resin coating layer (1-20 μm thick) on the substrate surface to improve transparency in the critical optical path area, while the bulk substrate maintains its lightweight and flexible properties. This local quality enhancement resolves the contradiction without compromising overall substrate weight.
3Strength
If the resin coating layer thickness is increased to improve transparency and mechanical strength, then light transmittance and strength are improved, but flexibility deteriorates
Solution Approach 1:
The patent optimizes the resin coating thickness parameter within a specific range (1-20 μm) to achieve the desired balance. By controlling the thickness and adjusting the resin's glass transition temperature (Tg ≥ 80°C), the coating provides sufficient mechanical strength while maintaining substrate flexibility for display applications.
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 composite sheet exhibits a high glass transition temperature, low coefficient of thermal expansion, and excellent light transmittance, ensuring robust mechanical strength and display quality without compromising flexibility, making it suitable for advanced display substrates.
Implementation Method 1
The binder may be formed using the oxetane-cyclic epoxy compound and a cation polymerizable compound
Implementation Method 2
The substrate may have a coefficient of thermal expansion of about 30 ppm/° C. or less, measured by a thermomechanical analyzer (TMA) at 5° C./min from 30 to 250° C.
Data Source
AI summary
An oxetane-cyclic epoxy compound represented by Formula 1:where R1 is hydrogen, a methyl group or an ethyl group.