INK FOR LASER IMAGING

In a first aspect, the invention provides an ink formulation comprising: (a) a near infrared absorbing system comprising a compound of the formula M1 W1 60 6 , wherein M 1 is one or more elements selected from the group consisting of H, He, alkali metals such as Li, Na, K, Rb, Cs, alkaline earth met...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	Jarvis, Anthony
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY CINEMATOGRAPHY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COLOUR PRINTING CORRECTING FLUIDS CORRECTION OF TYPOGRAPHICAL ERRORS DYES ELECTROGRAPHY ELECTROPHOTOGRAPHY FILLING PASTES HOLOGRAPHY i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME INKS LINING MACHINES MAGNETOGRAPHY METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS PHOTOGRAPHY PHYSICS POLISHES PRINTING PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	In a first aspect, the invention provides an ink formulation comprising: (a) a near infrared absorbing system comprising a compound of the formula M1 W1 60 6 , wherein M 1 is one or more elements selected from the group consisting of H, He, alkali metals such as Li, Na, K, Rb, Cs, alkaline earth metals such as Be, Mg, Ca, Sr, Ba, rare-earth elements, Zr, Cr, Mn, Fe, Ru, Co, Rh, 0 Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, AL Ga, in, Ti, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Hf, Os, Bi and I, or ammonium; (b) a colour change agent; and (c) a binder. The invention also provides alternative ink formulations for laser marking, a method of forming an 5 image using the ink formulations and a substrate coated with the ink formulation of the invention. Ink formulations according to the invention have been found to have good laser imaging efficacy, and an essentially negligible impact on the background colour of the coating.