Xylylene Diisocyanate Composition for Optical Lens Acidity Control
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Solution Overview
Problem
Existing xylylene diisocyanate compositions suffer from instability and variability in acidity and chlorine content, leading to issues such as white turbidity, stria formation, and reduced transparency in optical lenses due to inappropriate reactivity with polythiol compounds.
Innovation Solution
A xylylene diisocyanate composition is formulated with an acidity regulator having a boiling point of 110°C or higher, maintaining acidity between 100 ppm and 1,000 ppm, and a chlorine content of less than 100 ppm, along with a controlled reaction rate to stabilize the composition and enhance polymerization with polythiol compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the acidity of xylylene diisocyanate composition is not controlled, then the composition may have poor storage stability and inappropriate reactivity, but controlling acidity requires adding specific regulators which increases composition complexity
Solution Approach 1:
The patent applies parameter changes by precisely controlling the acidity of the xylylene diisocyanate composition within a specific range (100-1000 ppm) and maintaining chlorine content below 100 ppm. This parameter control resolves the contradiction by ensuring reaction stability through controlled acidity while avoiding excessive composition complexity through targeted regulation rather than multiple additives.
Solution Approach 2:
The patent uses an acidity regulator as an intermediary substance to control the acidity of the xylylene diisocyanate composition. This mediator approach allows precise control of reaction stability without requiring complex compositional adjustments, thereby resolving the contradiction between reliability and composition complexity.
2Object-affected harmful factors
If chlorine content in the composition is not controlled, then optical properties such as transmittance may deteriorate, but controlling chlorine content requires additional purification steps which increase manufacturing complexity
Solution Approach 1:
The patent applies parameter changes by controlling chlorine content within a specific range (below 100 ppm, preferably 10-95 ppm) to maintain optimal optical properties. This parameter control resolves the contradiction by ensuring high transmittance and optical quality while avoiding excessive manufacturing complexity through integrated process control rather than separate purification steps.
3Productivity
If acidity is not controlled in the xylylene diisocyanate composition, then polymerization reactivity with polythiol compounds may be inappropriate, but controlling acidity requires additional processing steps which reduce productivity
Solution Approach 1:
The patent applies preliminary action by controlling the acidity of the xylylene diisocyanate composition to 100-1000 ppm before the polymerization reaction with polythiol compounds. This preliminary control ensures appropriate reactivity and eliminates the need for additional processing steps during manufacturing, thereby resolving the contradiction between productivity and manufacturing ease.
4Duration of action of stationary object
If the composition lacks proper acidity control, then long-term storage stability deteriorates with increased turbidity and inhomogeneity, but implementing control measures increases production time
Solution Approach 1:
The patent applies parameter changes by controlling acidity to 100-1000 ppm and chlorine content to below 100 ppm in the xylylene diisocyanate composition. This parameter control ensures long-term storage stability (maintaining transmittance above 99% after 3 months) while minimizing production time through efficient integrated processing rather than multiple sequential steps.
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 improved stability, transparency, and uniformity in optical lenses by preventing white turbidity and stria formation, while maintaining appropriate reactivity and long-term storage characteristics.
Implementation Method 1
an acidity regulator having a boiling point of 110° C. or higher, wherein the xylylene diisocyanate composition has an acidity of greater than 100 ppm and 1,000 ppm or less
Implementation Method 2
a polymerizable composition for an optical material including: a xylylene diisocyanate composition which includes xylylene diisocyanate (XDI) and an acidity regulator
Implementation Method 3
a transmittance of the xylylene diisocyanate composition to a light at 380 nm wavelength after 3 months storage in a dark room at 25° C. may be 99% or more
Data Source
AI summary
A xylylene diisocyanate (XDI) composition according to exemplary embodiments includes xylylene diisocyanate and an acidity regulator having a boiling point of 110° C. or higher, and the composition has an acidity of greater than 100 ppm and 1,000 ppm or less based on a total weight of the xylylene diisocyanate (XDI). An optical lens having a high transmittance and improved optical uniformity can be manufactured by controlling a polymerization reaction rate through acidity adjustment.