Light absorbing layer for photo-chromic systems

The present invention discloses a composition which comprises a light absorbing layer adhered to an underlying layer containing a photo-chromic colorant, which photo-chromic colorant has been activated by exposure to UV light to undergo a reversible color change, and wherein the rate of color revers...

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Bibliographische Detailangaben
Hauptverfasser:	BIRNEY ROSS, HOEKSTRA KATHLEEN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS DYES FILLING PASTES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS INKS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LINING MACHINES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MEASURING MEASURING QUANTITY OF HEAT MEASURING TEMPERATURE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHYSICS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES STAMPS TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS TESTING THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The present invention discloses a composition which comprises a light absorbing layer adhered to an underlying layer containing a photo-chromic colorant, which photo-chromic colorant has been activated by exposure to UV light to undergo a reversible color change, and wherein the rate of color reversion is dependent on temperature. The ultraviolet light and/or visible light absorbing layer can be conveniently applied via thermal transfer or ink jet to a substrate comprising the photo-chromic colorant to protect it from unwanted exposure to UV and/or certain wavelengths visible light. The composition is conveniently employed in a temperature time indicator (TTI).