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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Bibliographische Detailangaben
Hauptverfasser:	KAWAUCHI KEIYA, SASAGAWA KATSUYOSHI, KOBAYASHI SEIICHI
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	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.