Optical Material Composition for High Refractive Index and Heat Resistance
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Solution Overview
Problem
Optical materials with high refractive index often suffer from insufficient heat resistance and mold release characteristics, leading to lens breakage during demolding.
Innovation Solution
A composition containing a ring compound, an episulfide compound, and sulfur, with specific mass ratios and the addition of a thiol compound, is polymerized and cured to enhance heat resistance and mold release characteristics while maintaining a high refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an organic compound having a cyclic skeleton containing a sulfur, selenium or tellurium atom is used to achieve a high refractive index of 1.73 or higher, then the refractive index is improved, but heat resistance becomes insufficient and mold release characteristics deteriorate
Solution Approach 1:
The patent uses a composite material system comprising a ring compound (a) with specific molecular structure, an episulfide compound (b), and sulfur (c) in controlled proportions. This composite approach combines the high refractive index contribution from the ring compound with the heat resistance and mold release properties provided by the episulfide compound and sulfur, achieving both optical performance and thermal stability simultaneously
Solution Approach 2:
The patent optimizes the compositional parameters by controlling the mass ratios of ring compound (a) at 5-70%, episulfide compound (b) at 20-90%, and sulfur (c) at 1-39%. By adjusting these parameters within specific ranges, the invention achieves the optimal balance between refractive index and heat resistance, resolving the contradiction through quantitative parameter optimization
2Illumination intensity
If an organic compound having a cyclic skeleton containing a sulfur, selenium or tellurium atom is used to achieve a high refractive index of 1.73 or higher, then the refractive index is improved, but mold release characteristics become insufficient and lenses are easily broken at demolding
Solution Approach 1:
The patent employs a composite material formulation where the episulfide compound (b) and sulfur (c) components specifically address mold release characteristics. These components work synergistically with the ring compound (a) to provide both high refractive index and excellent mold release properties, preventing lens breakage during demolding while maintaining optical performance
Solution Approach 2:
The invention achieves improved mold release characteristics by optimizing the content of sulfur (c) at 1-39% and episulfide compound (b) at 20-90%. This parameter optimization ensures that the material has sufficient flexibility and release properties during manufacturing while achieving the desired high refractive index, resolving the contradiction between optical performance and manufacturability
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 resulting optical material exhibits improved heat resistance, mold release characteristics, and light resistance, suitable for applications requiring high performance, such as spectacle lenses.
Implementation Method 1
polymerizing and curing a composition for optical materials having a specific composition containing a ring compound (a), an episulfide compound (b) and sulfur (c)
Data Source
AI summary
The present invention provides a composition for an optical material containing a ring compound (a) represented by formula (1), an episulfide compound (b), and sulfur (c), wherein the content of the ring compound (a) in the composition for an optical material is in the range of 5-70 mass%, the content of the episulfide compound (b) is in the range of 20-90 mass%, and the content of the sulfur (c) is in the range of 1-39 mass%. (In the formula, X represents S, Se or Te. a to f = 0 to 3, 8 ≥ (a + c + e) ≥ 1, 8 ≥ (b + d + f) ≥ 2, and (b + d + f) ≥ (a + c + e).) This composition for an optical material has a high refractive index as an optical characteristic, and has sufficient heat resistance and good mold release characteristics.