Laser marking of pigmented substrates

A method for producing fluorescent markings on a substrate which method comprises exposing a composition comprising a polymer and an organic pigment to a heat source, such as laser radiation, to produce a fluorescent markings which are not discernable when viewed under ambient visible light but read...

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Bibliographische Detailangaben
Hauptverfasser:	COLE DAMIEN THURBER, CAMPBELL COLIN DENNIS, SARVER JOSEPH E
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COLOUR PRINTING COMPOSITIONS BASED THEREON CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DECORATIVE ARTS DYES LINING MACHINES MACHINE TOOLS MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PERFORMING OPERATIONS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SOLDERING OR UNSOLDERING SPECIAL DESIGNS OR PICTURES STAMPS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING TYPEWRITERS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	A method for producing fluorescent markings on a substrate which method comprises exposing a composition comprising a polymer and an organic pigment to a heat source, such as laser radiation, to produce a fluorescent markings which are not discernable when viewed under ambient visible light but readily apparent under UV light is disclosed. The method produces novel compositions wherein a fluorescent form of a pigment is present at a higher concentration in defined domains relative to the remainder of the composition. The novel polymer composition is particularly useful in security marking applications.