Optical Material Composition Preventing Lens Clouding
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Solution Overview
Problem
Existing compositions for optical materials, particularly for plus-power lenses, face challenges in inhibiting white turbidity during curing, which leads to defective products and significant losses, as existing methods fail to predict and prevent this issue effectively.
Innovation Solution
A composition comprising sulfur with a turbidity value of 10 ppm or less in a 30% by mass solution of carbon disulfide, combined with an episulfide compound, and optionally including a polythiol compound, undergoes preliminary polymerization and deaeration treatment to prevent white turbidity in optical materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sulfur with higher purity is used to reduce white turbidity, then transparency is improved, but manufacturing complexity increases due to stringent purity requirements
Solution Approach 1:
The patent applies preliminary action by measuring the turbidity value of sulfur before polymerization and establishing predetermined thresholds. This allows quality assessment to be performed in advance, enabling proactive control of white turbidity prevention rather than reactive correction after the fact.
Solution Approach 2:
The patent transforms the quality control approach by changing from general purity specifications to a specific measurable parameter - the turbidity value in carbon disulfide solution. This parameter change enables quantitative assessment and objective decision-making for sulfur quality acceptance.
2Adaptability or versatility
If plus-power lenses with large central thickness are manufactured, then optical functionality is improved, but white turbidity occurrence increases due to light concentration
Solution Approach 1:
The patent applies preliminary anti-action by establishing turbidity value thresholds before manufacturing plus-power lenses. By controlling the sulfur turbidity value to be 10 ppm or less, the patent preemptively counteracts the tendency toward white turbidity that arises from light concentration in thick lenses, preventing the harmful effect before it manifests.
3Measurement precision
If quality assessment after curing is performed, then defective products are identified, but production losses increase due to heavy waste
Solution Approach 1:
The patent shifts quality assessment from post-curing to pre-polymerization stage by measuring turbidity value early in the process. This preliminary assessment identifies unsuitable sulfur before it is processed into final products, preventing waste of materials and production capacity on注定 defective batches.
Solution Approach 2:
The patent enables the sulfur material to essentially self-identify its suitability for optical lens manufacturing through the turbidity value measurement. This self-service quality indication eliminates the need for complex post-manufacturing inspection and reduces dependency on end-product testing.
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
This approach effectively inhibits white turbidity in cured products, particularly for plus-power lenses, allowing for quality assessment before curing and reducing the likelihood of defective products, thereby minimizing losses.
Implementation Method 1
sulfur, the turbidity value of which when made into a 30% by mass solution of carbon disulfide is 10 ppm or less
Implementation Method 2
a composition for optical materials which comprises: sulfur... and an episulfide compound
Data Source
AI summary
The present invention inhibits the clouding of cured products obtained by polymerizing and curing a composition including sulfur and an episulfide compound, and inhibits clouding particularly in lenses, called plus-power lenses, that have large central thicknesses; and provides a composition for optical materials with which it is possible to predict and assess whether or not clouding will occur after curing and to determine quality at a stage before polymerization and curing. These objectives are achieved by, for example, a composition for optical materials that includes: sulfur, the turbidity value of which when made into a 30-mass % carbon disulfide solution is 10 ppm or less; and an episulfide compound. That is, clouding is prevented and excellent transparency is achieved in optical materials produced from said composition for optical materials that comprises an episulfide compound and sulfur that satisfies the aforementioned condition in terms of turbidity value.