PHOTOCHROMIC POLYURETHANE COATING AND ARTICLES HAVING SUCH A COATING

Described are photochromic polyurethane coatings that meet commercially acceptable "cosmetic" standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm and improved photochromic properties...

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Bibliographische Detailangaben
Hauptverfasser:	HUNT, ROBIN, CONKLIN, JEANINE, GRUCHACZ, NANCYANNE, SWARUP, SHANTI, BOWLES, ROBERT, J., III
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADHESIVES AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON CONTACT LENSES DYES ELECTROGRAPHY HOLOGRAPHY MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS ORGANIC MACROMOLECULAR COMPOUNDS 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 THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	Described are photochromic polyurethane coatings that meet commercially acceptable "cosmetic" standards for optical coatings. Also described are articles having such coatings. The coatings exhibit a Fischer microhardness of from 50 to 150 Newtons per mm and improved photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. L'invention concerne des couches photochromiques de polyuréthanne conformes aux normes "cosmétiques" commercialement acceptables pour les couches optiques. Ces articles présentant de telles couches font aussi l'objet de cette invention. Ces couches font preuve d'une microdureté Fischer de 50 à 150 Newtons par mm et présentent des propriétés photochromiques améliorées, telles que la formation de couleurs activées plus foncées, ainsi que des taux plus rapides d'activation photochromique sous l'effet de rayonnements ultraviolets et de décoloration lorsque non soumises à ces rayonnements.