PHOTOCHROMIC SPIROPYRAN COMPOUNDS

A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they colour in sunlight and fade rapidly at ambient tem...

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Bibliographische Detailangaben
Hauptverfasser:	IAN TOMLINSON, JOHN WHITTALL, STEPHEN NIGEL OLIVER, HARRY GEORGE HELLER
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON 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 ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	A series of novel photochromic spiropyrans are disclosed in which a spiro-adamantane group is introduced into the 2-position of the benzopyran or naphthopyran ring. The spiropyran compounds of the invention exhibit heliochromic properties, i.e. they colour in sunlight and fade rapidly at ambient temperatures in the absence of U.V. light, making them good candidates for use in the manufacture of sunglasses. The invention includes lenses which darken in sunlight and incorporate the novel spiropyrans and a process for the preparation of the spiropyran compounds.