ROTOGRAVURE PRINTING PROCESSES FOR PRODUCING OPTICALLY VARIABLE SECURITY FEATURES

The present invention is related to the filed of optically variable security elements comprising a region based on a single cured ink comprising a cholesteric liquid crystal polymer, said region having at least two, preferably at least three, patterns exhibiting, at at least one viewing angle, a dif...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	VUILLEUMIER, Lucien, PASQUIER, Cécile, GARNIER, Christophe
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES BOOK COVERS BOOKBINDING CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDEDFOR DYES FILES FILLING PASTES INKS LINING MACHINES LOOSE LEAVES MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS MOVABLE-STRIP WRITING OR READING APPARATUS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITYFEATURES PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOTOTHERWISE PROVIDED FOR PRINTING PRINTING MACHINES OR PRESSES PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SPECIAL PRINTED MATTER STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	The present invention is related to the filed of optically variable security elements comprising a region based on a single cured ink comprising a cholesteric liquid crystal polymer, said region having at least two, preferably at least three, patterns exhibiting, at at least one viewing angle, a different CIE (1976) color index parameter and/or a different position of the selective reflection band for protecting security documents against counterfeiting and/or illegal reproduction. In particular, the present invention relates to processes for manufacturing said features, when the processes comprises the steps of a) applying on a substrate by a rotogravure process with the use of a gravure cylinder having at least two, preferably at least three, different engravings a single cholesteric liquid crystal precursor composition, b) heating the applied composition to bring said composition to a cholesteric liquid crystal state, and c) curing the composition so as to form the region based on a single cured ink comprising a cholesteric liquid crystal polymer.