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AssigneeAgfa-Gevaert
InventorsPaul Callant, Ingrid Geuens, Bart Waumans, Hubertus Van Aert
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A method of color laser marking an article having a polymeric foil with at least one colorless layer containing an infrared absorber, a polymeric binder and a color forming compound; including the steps of:—laser marking the colorless layer with an infrared laser using a first laser operation mode to generate a blue or cyan color; and—laser marking the same colorless layer with an infrared laser using a second laser operation mode to generate a black color, wherein the first laser operation mode applies less energy to the colorless layer than the second laser operation mode. Also disclosed is an article, such as a security document, including a polymeric foil and a colorless layer containing laser marked graphical data having a blue or cyan color and laser marked information having a black color.
A method of colour laser marking an article having a polymeric foil with at least one colourless layer containing an infrared absorber, a polymeric binder and a single colour forming compound selected from the group consisting of a leuco dye and a colourless dye-precursor;
The method according to 1 wherein the polymeric foil is a biaxially stretched polyethylene terephthalate foil.
An article including a polymeric foil and a colourless layer containing an infrared absorber, a polymeric binder and a single colour forming compound selected from the group consisting of a leuco dye and a colourless dye-precursor, wherein the article includes in one and the same colourless layer a laser marked image having a blue or cyan colour and laser marked information having a black colour.
The article according to 10 wherein the article is a security document.
Dependencies are inferred from the claim text.