IR dyes and laser markable articles comprising such IR dyes

Infrared dyes having an infrared absorption maximum above 1130 nm are disclosed which have minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.

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Bibliographische Detailangaben
1. Verfasser:	Steenackers, Marin
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES BOOK COVERS BOOKBINDING CHEMISTRY COLOUR PRINTING DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR DYES FILES LAKES LINING MACHINES LOOSE LEAVES METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MORDANTS MOVABLE-STRIP WRITING OR READING APPARATUS NATURAL RESINS ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES PAINTS PERFORMING OPERATIONS POLISHES PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SPECIAL PRINTED MATTER STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	Infrared dyes having an infrared absorption maximum above 1130 nm are disclosed which have minor colouration in the visual spectrum. The infrared dyes are especially useful for producing multicolour laser marked security documents having reduced background coloration and enhanced colour gamut.