Polythiol Composition for Thiourethane Resin Dyeability

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Solution Overview

Problem

Existing thiourethane resins used in plastic lenses lack sufficient dyeability, limiting their coloration capabilities.

Innovation Solution

A polythiol composition comprising specific polythiol compounds with defined retention times and peak areas in high-performance liquid chromatography, combined with a polyiso(thio)cyanate compound, is used to produce thiourethane resins with enhanced dyeability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional polythiol compositions are used to produce thiourethane resins, then the resin can be manufactured with standard properties, but the dyeability of the resin is insufficient

Engineering Contradiction:

Improvemanufacturability of thiourethane resinVSAvoiddyeability of thiourethane resin

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent changes the chemical composition parameters of the polythiol by specifying precise HPLC retention times (16.0-19.0 minutes for compound C2, 32.0-35.0 minutes for compound C3, 21.5-25.0 minutes for compound C4) and peak area ratios. This parameter optimization enables the resulting thiourethane resin to achieve excellent dyeability while maintaining manufacturability through controlled synthesis from defined raw material specifications.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the polythiol composition is optimized for dyeability, then the resin achieves better coloration properties, but the yellowness increases

Engineering Contradiction:

Improvedyeability of resinVSAvoidyellowness of resin

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by selectively controlling the composition of specific compounds within the polythiol mixture. By precisely defining the presence and ratios of compounds with specific retention times (C2, C3, C4) and their peak area relationships, the invention achieves localized chemical composition optimization that simultaneously improves dyeability while suppressing yellowness development in the final resin.

Inventive Principle:

Principle #3Local quality

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 resulting thiourethane resins exhibit improved dyeability and reduced yellowness, allowing for better coloration and transparency.

Implementation Method 1

the polythiol composition comprises a compound C2 that has a retention time of from 16.0 minutes to 19.0 minutes in a high-performance liquid chromatography measurement

Methodology Applied

Scientific EffectChromatography: Chromatography

Data Source

PatentUS20250110259A1Polythiol composition and application of same

Publication Date: 2025.04.03 MITSUI CHEMICALS INC

AI summary

A polythiol composition, comprising a polythiol compound, wherein: the polythiol composition comprises a compound C2 that has a retention time of from 16.0 minutes to 19.0 minutes in a high-performance liquid chromatography measurement performed under a specific measurement conditions A, and in the high-performance liquid chromatography measurement, the compound C2 has a peak area of 1.000 or more with respect to a total of 100 of a peak area of the compound C2 and a peak area of a main component of the polythiol composition.