Alkynyl Isocyanate Optical Material Resolving Refractive Index and Abbe Number Trade-off
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Solution Overview
Problem
Existing polymerizable compositions for optical materials either have high refractive index but low Abbe number and mechanical strength, or they compromise on refractive index and optical properties due to complex manufacturing processes, leading to instability in lens production.
Innovation Solution
A polymerizable composition comprising a compound with a carbon-carbon triple bond and at least one isocyanate or isothiocyanate group, combined with a polythiol compound, which is formulated to achieve a balance between high refractive index, Abbe number, and mechanical strength, with a specific functional group molar ratio and optimized manufacturing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polymerizable composition containing phenylene diisocyanate and polythiol compound is used to achieve high refractive index (1.7 or more), then the refractive index is improved, but the Abbe number is low and chromatic aberration is large
Solution Approach 1:
The invention changes the chemical structure parameters of the isocyanate compound by introducing a carbon-carbon triple bond (alkynyl group) into the molecular structure. This structural parameter change enables the material to achieve both high refractive index (1.60-1.80) and high Abbe number (30 or more) simultaneously, resolving the contradiction between refractive index and Abbe number that existed in conventional phenylene diisocyanate systems
2Illumination intensity
If an episulfide compound is used to achieve high refractive index, then the refractive index is improved, but mechanical strength is lowered
Solution Approach 1:
The invention creates a composite polymer system by combining alkynyl isocyanate compound (A) with polythiol compound (B) in a specific molar ratio (0.96:1 to 1.04:1). This composite approach leverages the high refractive index contribution from the alkynyl isocyanate while the polythiol provides structural integrity and mechanical strength, achieving both high refractive index (1.60-1.80) and excellent mechanical properties including impact resistance and drilling workability
3Illumination intensity
If a composition containing three polymerization components is used to achieve low refractive index, then the refractive index is reduced, but manufacturing processes become complicated and yield is reduced
Solution Approach 1:
The invention extracts and eliminates unnecessary components from the polymerization system. By removing redundant polymerization components and focusing on the essential duo of alkynyl isocyanate (A) and polythiol (B), the formulation achieves optimal refractive index (1.60-1.80) while dramatically simplifying the manufacturing process. This reduction to essential components improves manufacturing stability and yield without sacrificing optical performance
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 results in an optical material with a refractive index range of 1.60 to 1.80, high Abbe number, and excellent mechanical strength, enhancing the balance of optical and mechanical properties while simplifying the manufacturing process.
Implementation Method 1
a polymerizable composition for an optical material, including: (A) a compound having a carbon-carbon triple bond and at least one group selected from an isocyanate group and an isothiocyanate group in a molecule; and (B) a polythiol compound
Data Source
AI summary
The polymerizable composition for an optical material of the present invention includes: (A) a compound having a carbon-carbon triple bond and at least one group selected from an isocyanate group and an isothiocyanate group in a molecule; and (B) a polythiol compound.