PHOTOCHROMIC MATERIALS DEMONSTRATING IMPROVED FADE RATES

Various photochromic materials are provided that are essentially free of polymerizable unsaturated groups, and comprise: a) an indeno[2′,3′:3,4]naphtho[1,2-b]pyran; and b) an electron-withdrawing, non-conjugating group bonded at the 11-position of the indeno[2′,3′:3,4]naphtho[1,2-b]pyran. Alternativ...

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Bibliographische Detailangaben
Hauptverfasser:	CHOPRA, Anu, BROWN, Patrick, M
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY 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
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Beschreibung
Zusammenfassung:	Various photochromic materials are provided that are essentially free of polymerizable unsaturated groups, and comprise: a) an indeno[2′,3′:3,4]naphtho[1,2-b]pyran; and b) an electron-withdrawing, non-conjugating group bonded at the 11-position of the indeno[2′,3′:3,4]naphtho[1,2-b]pyran. Alternative embodiments include various substituents at other positions of the indeno[2′,3′:3,4]naphtho[1,2-b]pyran.