Photochromic 3H-naphtho[2,1-b]-pyran compounds and photochromic articles produced therewith

Specific photochromic 3H-naphtho[2,1-b]-pyran compounds useful with various types of synthetic resin materials to form photochromic articles, especially ophthalmic lenses, and photochromic articles formed with such compounds. The compounds of the invention have especially long-wave absorption maxima...

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Bibliographische Detailangaben
Hauptverfasser:	MELZIG MANFRED, WEIGAND UDO, MANN CLAUDIA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY CONTACT LENSES DYES ELECTROGRAPHY HETEROCYCLIC COMPOUNDS HOLOGRAPHY MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC CHEMISTRY PAINTS PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS POLISHES SPECTACLES SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES
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Beschreibung
Zusammenfassung:	Specific photochromic 3H-naphtho[2,1-b]-pyran compounds useful with various types of synthetic resin materials to form photochromic articles, especially ophthalmic lenses, and photochromic articles formed with such compounds. The compounds of the invention have especially long-wave absorption maxima in the open form thereof and enable violet to blue tints to be obtained when used in photochromic articles.