METHOD OF PREPARING LOW HAZE POLYMER COMPOSITIONS FOR USE IN HIGH REFRACTIVE INDEX OPTICAL MATERIALS

A method of preparing a low bubbling and low yellowing, high refractive index polyurethane or polythiourethane is provided. A method of evaluating an aromatic polyiso(thio)cyanate material, such as an aromatic diisocyanate, e.g., m-xylylene diisocyanate, is provided. The method evaluates transmittan...

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Bibliographische Detailangaben
Hauptverfasser:	KIDDER-WOLFF Nigel D, HAVENS Barry R, DABIDEEN Darrin R, LUCHANSKY Matthew S
Format:	Patent
Sprache:	eng ; spa
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON CONTACT LENSES MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY OPTICS 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:	A method of preparing a low bubbling and low yellowing, high refractive index polyurethane or polythiourethane is provided. A method of evaluating an aromatic polyiso(thio)cyanate material, such as an aromatic diisocyanate, e.g., m-xylylene diisocyanate, is provided. The method evaluates transmittance in a sample of the isocyanate to determine if the aromatic polyiso(thio)cyanate material will lead to unacceptable bubbling or yellowing in a high refractive index or high Abbe number polymer composition. Se proporciona un método para preparar un poliuretano o politiouretano con índice de refracción alto y baja cantidad de burbujas y amarilleo. Se proporciona un método para evaluar un material de poliiso(tio)cianato aromático, tal como un diisocianato aromático, por ejemplo, diisocianato de m-xilileno. El método evalúa la transmitancia en una muestra del isocianato para determinar si el material de poliiso(tio)cianato aromático producirá burbujas o amarilleo inaceptables en una composición de polímero con índice de refracción alto o número de Abbe alto.