Episulfide Curable Composition for Controlled Optical Curing
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Solution Overview
Problem
Existing curable solutions for high refractive index plastics used in lenses for virtual and augmented reality devices suffer from rapid curing, leading to striae phenomena, limited storage time, and inadequate mechanical properties, such as low glass transition temperature and refractive index.
Innovation Solution
A curable composition comprising an episulfide compound and an aromatic ring compound with specific weight ratios, controlling the curing reaction rate to prevent rapid curing and enhance storage stability, while achieving high refractive index and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a curable solution containing a curing agent and/or catalyst is used to form high refractive index plastic, then the curing reaction rate increases, but the viscosity increases rapidly and the solution must be consumed in a short time, making it difficult to store
Solution Approach 1:
The patent separates the curing agent from the main curable composition, storing it in a different container. The curing agent is only added when the composition is ready to be used, extracted from the storage system and introduced at the point of application. This allows the main composition to remain stable and storeable for extended periods while enabling rapid curing when needed.
Solution Approach 2:
The patent prepares the curable composition in advance with all necessary components except the curing agent, which is added just before use. This preliminary preparation allows the base composition to be formulated and stored optimally, while the curing reaction is initiated at the precise moment when processing is required, ensuring both storability and rapid curing performance.
2Power
If the curing reaction rate increases rapidly, then the curable solution shows high reactivity, but the viscosity increases rapidly causing striae phenomena and limiting usability
Solution Approach 1:
The patent enables control over the timing and progression of the curing reaction by separating the curing agent addition from the composition preparation. This allows for periodic or staged introduction of the curing agent, enabling the reaction to proceed in a controlled manner rather than all at once, thereby preventing sudden viscosity spikes and striae formation while maintaining high ultimate reactivity.
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 composition allows for long-term storage and prevents striae phenomena, providing a cured product with high refractive index, excellent mechanical properties, and a glass transition temperature of 80°C or more, suitable for replacing glass or plastic lenses.
Implementation Method 1
an aromatic ring compound containing two or more hydroxyl groups
Implementation Method 2
a cured product of an episulfide compound and an aromatic ring compound containing two or more hydroxyl groups
Data Source
AI summary
A curable composition comprising an episulfide compound represented by Chemical Formula 1 and an aromatic ring compound containing two or more hydroxyl groups represented by Chemical Formula 2 or 3, and an optical material including a cured product of the curable composition.