Layer-type value document comprising an ink mixture in one layer

摘要

The invention relates to a value document, especially a banknote, having a sequence of layers into which visually and/or mechanically perceptible identifiers in the form of patterns, letters, numbers or images are introduced by the action of laser radiation. According to the present invention, the sequence of layers includes a marking layer (22) composed of an ink mixture (24, 26) exhibiting a laser-radiation-absorbing mixture component (26) and a laser-radiation-transparent mixture component (24), the identifiers being visually and/or mechanically perceptible due to an irreversible change in the optical properties of the ink mixture (24, 26), effected by the action of the laser radiation.

主权项

1. A value document, especially a banknote, having a substrate and a sequence of layers on the substrate,
the sequence of layers comprising visually and/or mechanically perceptible identifiers in the form of patterns, letters, numbers or images introduced by the action of laser radiation, characterized in that the sequence of layers contains a marking layer composed of an ink mixture containing optically variable color pigments and comprising a laser-radiation-absorbing mixture component and a laser-radiation-transparent mixture component, wherein the laser-radiation-absorbing mixture component comprises optically variable interference layer pigments and wherein the laser-radiation-transparent mixture component comprises optically variable liquid crystal pigments, the identifiers being visually and/or mechanically perceptible due to an irreversible change in the optical properties of the ink mixture, the irreversible change effected by the action of the laser radiation.