Method for producing resin for optical component, resin for optical component, spectacle lens, and spectacles
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Solution Overview
Problem
Conventional plastic lenses with a polymer of polyisocyanate and polythiol components face issues with inconsistent dyeing density across production lots, requiring adjustments in dyeing conditions, which decreases productivity and makes it difficult to achieve uniform color tone due to their hydrophobic nature and dense network structure.
Innovation Solution
Incorporating a polythiol compound with two or more sulfide bonds and adjusting the content of hydrolyzable chlorine compounds in the polyisocyanate component within a specific range (10-100 ppm) to enhance the dyeability of the optical component resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polythiol compound having two or more sulfide bonds is used to increase refractive index, then the refractive index is improved, but the resin becomes hydrophobic and dense, making dye penetration difficult
Solution Approach 1:
The patent changes the chemical parameter of the polyisocyanate component by controlling the content of hydrolyzable chlorine compounds within 10-100 ppm. This parameter change modifies the resin's hydrophobicity and network structure density, enabling dye penetration while maintaining high refractive index from the polythiol compound
Solution Approach 2:
The patent creates a composite material system combining polythiol compound (for high refractive index) with specifically controlled polyisocyanate component (containing hydrolyzable chlorine compounds). This composite approach allows the resin to simultaneously achieve high refractive index and good dyeability through the synergistic interaction of components
2Illumination intensity
If conventional polyisocyanate and polythiol components are used, then high refractive index is achieved, but dyeing density varies across production lots, requiring adjustment of dyeing conditions
Solution Approach 1:
The patent establishes a specific parameter range for hydrolyzable chlorine compound content (10-100 ppm) in the polyisocyanate component. This precise parameter control ensures consistent resin properties across production lots, eliminating the need to adjust dyeing conditions for each batch while maintaining high refractive index
Solution Approach 2:
The patent implements a feedback mechanism by specifying the hydrolyzable chlorine compound content as a controlled parameter. This feedback control ensures that each production lot meets the required specification, guaranteeing consistent dyeing density and refractive index across all batches
3Manufacturing precision
If dyeing conditions are adjusted for each production lot to correct dyeing density, then color tone accuracy is improved, but productivity decreases
Solution Approach 1:
The patent performs preliminary action by controlling the hydrolyzable chlorine compound content during resin manufacturing. This preliminary control of resin properties eliminates the need for subsequent adjustments in dyeing conditions, achieving both accurate color tone and high productivity without batch-by-batch optimization
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 results in an optical component resin with improved dyeability, allowing for consistent color tone across production lots and increased productivity by optimizing the content of hydrolyzable chlorine compounds in the polyisocyanate component.
Implementation Method 1
a step of polymerizing a polymerizable composition containing a polyisocyanate component and a polythiol component
Implementation Method 2
the obtained urethane resin is hydrophobic as compared with a conventional resin, and a network structure of the resin is dense
Data Source
AI summary
An embodiment of the present disclosure relates to a method for producing an optical component resin having excellent dyeability, 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 polyisocyanate component and a polythiol component containing 40 mol % or more of a polythiol compound having two or more sulfide bonds in a molecular structure thereof, in which the content of a hydrolyzable chlorine compound contained in the polyisocyanate component is in a range of 10 ppm by mass or more and 100 ppm by mass or less in the polyisocyanate component, 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.