HIGH REFRACTIVE INDEX COMPOSITION FOR PLASTIC LENS AND LENS

PROBLEM TO BE SOLVED: To obtain a high-refractive index composition for plastic lens, containing a specific polyisocyanate component and a polythiol component component, useful in the production of lenses of low dispersion, high refractive index, low water absorption and excellent surface hardness....

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Hauptverfasser: KAWAUCHI KEIYA, SASAGAWA KATSUYOSHI, KOBAYASHI SEIICHI
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creator KAWAUCHI KEIYA
SASAGAWA KATSUYOSHI
KOBAYASHI SEIICHI
description PROBLEM TO BE SOLVED: To obtain a high-refractive index composition for plastic lens, containing a specific polyisocyanate component and a polythiol component component, useful in the production of lenses of low dispersion, high refractive index, low water absorption and excellent surface hardness. SOLUTION: This composition for lens comprises (A) tris(isocyanatomethylthio)methane (for example, thioglycolic acid is allowed to react with formic acid to form tris(carboxylmethylthio)methane, which is allowed to react with a lower alcohol and the product is allowed to react with hydrazine hydrate to give tris(hydrazinocarbonylmethylthio)methane, which is converted to the objective compound), and (B) the component containing 2, 2-bis(mercaptomethyl)-1, 3-propanedithiol, 1, 2, 4-tris(mercaptomethyl)benzene, 1, 2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane or 4, 8-bis(mercaptomethyl)-3, 6, 9-trithia-1, 11-undecanedithiol.
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subjects ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOSITIONS BASED THEREON
CONTACT LENSES
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
PHYSICS
SPECTACLES
SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
THEIR PREPARATION OR CHEMICAL WORKING-UP
title HIGH REFRACTIVE INDEX COMPOSITION FOR PLASTIC LENS AND LENS
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