Optical Component Resin Yellowing Suppression via UV Absorber Color Control
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Solution Overview
Problem
The existing plastic lenses with ultraviolet absorbers exhibit varying yellowing (YI value) depending on production lots, even with the same absorber, leading to customer dissatisfaction due to potential deterioration in optical material quality.
Innovation Solution
A method for producing optical component resin by polymerizing a composition containing a polythiol component, a polyisocyanate component, and an ultraviolet absorber, where the ultraviolet absorber has a Hazen color number of 40 or less in a toluene solution, effectively suppressing yellowing by controlling the color tone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an ultraviolet absorber is added to the polymerizable composition, then yellowing of the optical component is suppressed, but the YI value varies depending on production lots even with the same absorber
Solution Approach 1:
The patent applies parameter changes by specifying precise compositional parameters for the ultraviolet absorber (maximum absorption wavelength of 345 nm or more, Hazen color number of 30 or less in toluene solution at 10% concentration) and the polymerizable composition components. This standardization of parameters ensures consistent YI values across production lots while maintaining yellowing suppression.
Solution Approach 2:
The patent implements feedback control by measuring and controlling the Hazen color number of the ultraviolet absorber in toluene solution and the YI value of the resulting optical component. This quality feedback mechanism allows adjustment of the ultraviolet absorber selection and composition to maintain consistent YI values across different production batches.
2Quantity of substance
If a small amount of ultraviolet absorber is used in thin lenses, then the optical component maintains good optical properties, but yellowing cannot be effectively suppressed
Solution Approach 1:
The patent changes the quality parameters of the ultraviolet absorber rather than increasing quantity. By selecting absorbers with maximum wavelength of 345 nm or more and Hazen color number of 30 or less, the patent achieves effective yellowing suppression with small amounts of absorber in thin lenses, avoiding the need to increase concentration.
Solution Approach 2:
The patent uses a standardized model for selecting ultraviolet absorbers based on specific spectral and colorimetric properties. This modeling approach allows consistent selection of absorbers that provide effective yellowing suppression at low concentrations, replicating optimal performance across different production scenarios.
3Object-affected harmful factors
If the Hazen color number of the ultraviolet absorber is reduced, then yellowing is suppressed, but the color tone of the absorber in solution changes
Solution Approach 1:
The patent changes the spectral parameters of the ultraviolet absorber by selecting compounds with maximum absorption wavelength of 345 nm or more. This wavelength shift achieves yellowing suppression (Hazen color number of 30 or less) while the specific molecular structures maintain acceptable color tones in the final optical component.
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 method consistently suppresses yellowing in optical components, ensuring low YI values and maintaining mechanical strength, even with small amounts of ultraviolet absorbers in thin lenses.
Implementation Method 1
an ultraviolet absorber having a maximum absorption wavelength of 345 nm or more
Implementation Method 2
polymerizing a polymerizable composition containing a polythiol component, a polyisocyanate component, and an ultraviolet absorber
Data Source
AI summary
A method for producing an optical component resin, suppressing yellowing due to addition of an ultraviolet absorber, an optical component resin, a spectacle lens, and spectacles. A method for producing an optical component resin, including a step of polymerizing a polymerizable composition containing a polythiol component, a polyisocyanate component, and an ultraviolet absorber, in which the ultraviolet absorber has a Hazen color number (APHA) of 40 or less in a toluene solution thereof having a concentration of 10% by mass, an optical component resin obtained by the producing method, an optical component formed of the optical component resin, a spectacle lens including a lens substrate formed of the optical component resin, and spectacles including the spectacle lens.