Optical Material Composition Turbidity Control
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Solution Overview
Problem
Conventional compositions for optical materials containing thiol compounds often become clouded during polymerization and curing, making it difficult to predict their quality before the process, leading to significant losses.
Innovation Solution
A composition comprising polythiol with an initial turbidity of 0.5 ppm or less and episulfide, with sulfur, that is preliminarily polymerized and degassed, ensuring a turbidity of 0.6 ppm or less after storage at 50°C for 7 days, allowing for estimation of cloudiness before curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thiol compound is added to improve oxidation resistance and refractive index, then oxidation resistance and refractive index are improved, but the composition becomes clouded during polymerization and curing
Solution Approach 1:
The invention changes the purity parameter of the thiol compound from conventional levels to extremely high purity (initial turbidity 0.5 ppm or less, stored turbidity 0.6 ppm or less). This parameter change allows the thiol compound to maintain its functional benefits for oxidation resistance and refractive index while eliminating the clouding problem during polymerization and curing.
2Manufacturing precision
If high purity polythiol is used to prevent clouding, then transparency is maintained, but it becomes difficult to estimate quality before curing
Solution Approach 1:
The invention performs preliminary turbidity measurement of the polythiol compound before polymerization and curing. By measuring the initial turbidity (0.5 ppm or less) and the turbidity after storage at 50°C for 7 days (0.6 ppm or less), the quality of the composition can be estimated in advance, allowing prediction of whether the final product will be clouded or transparent without needing to wait for the curing process.
3Ease of manufacture
If conventional composition is used, then production process is simple, but massive loss occurs due to clouding after curing
Solution Approach 1:
The invention introduces a preliminary quality estimation step by measuring the turbidity of the polythiol compound before polymerization. This allows defective compositions that would become clouded after curing to be identified and discarded in advance, preventing massive material loss. The measurement process is simple and does not complicate the overall manufacturing flow, maintaining ease of manufacture while dramatically reducing waste.
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
Enables the determination of cloudiness in optical materials before polymerization, ensuring only high-quality products are produced, preventing clouding and maintaining transparency in the final optical material.
Implementation Method 1
a composition for an optical material comprising polythiol having an initial turbidity of 0.5 ppm or less and a turbidity of 0.6 ppm or less after being stored at 50°C for 7 days, and episulfide
Implementation Method 2
which is obtained as a result of degassing
Implementation Method 3
which is obtained as a result of annealing the post-polymerization composition for an optical material
Data Source
AI summary
The present invention has an object of providing, for example, a composition for optical materials which contains a polythiol that can be predicted and assessed, in a stage prior to polymerization/curing, as being clouded or not clouded after polymerization/curing, and thus can be determined as being good or defective. According to the present invention, the above-described object is achieved by, for example, a composition for optical materials which comprises a polythiol that exhibits an initial turbidity of 0.5 ppm or less and a turbidity of 0.6 ppm or less after the storage at 50°C for 7 days, and an episulfide. Namely, an optical material made from a composition for optical materials which contains a polythiol satisfying the above turbidity requirements can be prevented from clouding to exhibit excellent transparency.