Blue 3H-naphtho[2,1-b]pyran compounds and use thereof in photochromic articles

Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula I in which the groups R1 to R7 and B' have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran d...

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Bibliographische Detailangaben
Hauptverfasser:	MELZIG MANFRED, WEIGAND UDO, MANN CLAUDIA
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY DYES HETEROCYCLIC COMPOUNDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC CHEMISTRY PAINTS POLISHES
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Beschreibung
Zusammenfassung:	Photochromic 3H-naphtho[2,1-b]pyran compounds corresponding to formula I in which the groups R1 to R7 and B' have defined meanings and the use of such photochromic compounds in synthetic resin articles of all types, particularly for ophthalmic purposes. The photochromic 3H-naphtho[2,1-b]pyran derivatives have particularly long-waved absorption maxima in the open form, and when used in photochromic eyeglass lenses, produce essentially blue color tones which have a high darkening capacity.