Triazine Curable Composition for High Refractive Index Optical Coatings
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Solution Overview
Problem
High refractive index materials used in optical members often suffer from surface defects like roughness and cracks, and are prone to further damage when exposed to high-temperature-and-high-humidity environments, due to limitations in existing curable compositions.
Innovation Solution
A curable composition incorporating a triazine compound with an optionally substituted monocyclic or condensed aromatic group bonded via an amino group, combined with triethylene glycol dimethyl ether as a solvent, to enhance refractive index and prevent surface defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the content of the triazine derivative is increased to achieve a higher refractive index, then the refractive index of the cured product is improved, but surface defects such as roughness and cracks occur
Solution Approach 1:
The patent changes the chemical structure parameters of the triazine derivative by introducing specific aromatic groups (phenyl, naphthyl, pyridine, pyrimidine, triazine rings) at defined positions (R1, R2, R3) and controlling the content within 1-50 mass%. This structural parameter optimization allows achieving high refractive index (1.60 or higher) while preventing surface defects during curing
Solution Approach 2:
The patent creates a composite curable composition combining the specially structured triazine derivative with a polymerizable compound and photopolymerization initiator. This composite approach enables the triazine derivative to provide high refractive index while the polymerizable components ensure proper curing and surface quality, resolving the contradiction between refractive index and surface defect prevention
2Illumination intensity
If the curable composition is used to form high refractive index materials, then the refractive index is improved, but cracks and blisters occur when exposed to high-temperature-and-high-humidity environment
Solution Approach 1:
The patent modifies the chemical structure parameters of the triazine derivative by introducing aromatic groups with specific electron-withdrawing or electron-donating characteristics at positions R1, R2, R3. This structural parameter change enhances the chemical stability and environmental resistance of the cured product, preventing cracks and blisters in high-temperature-and-high-humidity conditions while maintaining high refractive index
Solution Approach 2:
The patent develops a composite system where the specially structured triazine derivative works synergistically with the polymerizable compound and photopolymerization initiator. This composite material approach creates a cured product that achieves both high refractive index and superior environmental stability, resolving the contradiction between optical performance and reliability in harsh environments
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 achieves a high refractive index with a smooth surface and improved heat resistance, preventing cracks and blisters even in harsh environmental conditions.
Implementation Method 1
a curable composition including a triazine derivative having a specific structure, a polymerizable compound, a resin, and a photopolymerization initiator
Data Source
AI summary
A curable composition that can contain a high concentration of a heterocyclic compound (A) having a triazine ring as a component which gives a cured product exhibiting a high refractive index, surface without defects such as roughness or cracks, and is unlikely to have cracks occurring on the surface thereof even when exposed to a high-temperature and high-humidity environment, a cured product of the curable composition, and a compound that may be blended to the curable composition. As a component of the composition, a triazine compound having a structure in which an optionally substituted monocyclic aromatic group(s) or an optionally substituted condensed aromatic group(s) is/are bonded to the triazine ring via an amino group, and, as a solvent, triethylene glycol dimethyl ether are used in combination.