Optical Component Monomer Purity Control to Suppress Curing Clouding

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Solution Overview

Problem

Clouding occurs during the thermal polymerization of epithio compounds used in optical components, necessitating a solution to suppress this phenomenon.

Innovation Solution

A monomer for optical components is developed with a specific P1/P2 ratio of peak areas in gel permeation chromatography, where P1 is the total value of peak areas before the main peak and P2 is the total value of all peak areas, limited to 3.5% or less, to minimize clouding during curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If epithio compound is thermally polymerized, then high transparency and high refractive index are achieved, but clouding occurs during curing

Engineering Contradiction:

ImprovetransparencyVSAvoidclouding

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by strictly controlling the purity of the epithio compound monomer, specifically limiting the P1/P2 ratio (total value of peak areas before main peak divided by total value of all peak areas in GPC measurement) to 3.5% or less. This purity parameter control prevents clouding during thermal polymerization while maintaining the desired optical properties of high transparency and high refractive index in the cured resin.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If epithio compound is used for optical component, then high Abbe number is obtained, but clouding suppression is required

Engineering Contradiction:

ImproveAbbe numberVSAvoidclouding

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent resolves this contradiction by implementing precise parameter control of the monomer purity, defined by the P1/P2 ratio from gel permeation chromatography measurements. By maintaining this ratio at 3.5% or less, the invention enables the epithio compound to deliver its full optical performance including high Abbe number while suppressing the harmful clouding effect during the curing process.

Inventive Principle:

Principle #35Parameter changes

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 monomer effectively suppresses clouding in the curing process, ensuring transparency and clarity of the optical components.

Implementation Method 1

If a polymerizable composition for an optical component containing the epithio compound shown in PTL 1 is thermally polymerized

Methodology Applied

Scientific EffectThermal polymerization:

Implementation Method 2

a total value P1 of peak areas at retention times before the main peak in measurement through gel permeation chromatography

Methodology Applied

Scientific EffectGel permeation chromatography: Chromatography

Data Source

PatentUS20250376456A1Monomer for optical component, polymerizable composition for optical component, cured product, and spectacle lens

Publication Date: 2025.12.11 HOYA LENS THAILAND LTD

AI summary

One embodiment according to the present disclosure relates to a monomer for an optical component, including: a compound represented by the formula (1), in which a total value P1 of peak areas at retention times before the main peak in measurement through gel permeation chromatography is 3.5% or less of a total value P2 of all peak areas.