Patent ID: 9321294
Filing Date: 2016-04-26
CPC Classification: B41M,B42D,G09F

Claim Text:
1. A security document comprising a carrier substrate, a film element and an adhesive layer arranged between the carrier substrate and the film element, wherein the carrier substrate has a carrier layer, and wherein the film element is transparent at least in areas and has at least one decorative layer with at least one optical security feature, and wherein the carrier substrate comprises a thermal paper and/or wherein the carrier layer is coated with a thermosensitive coating and the thermosensitive coating extends at least in areas into the volume of the carrier layer, and wherein the thermal paper and/or the thermosensitive coating is arranged between the adhesive layer and the carrier layer, and wherein the film element covers the thermal paper and/or the thermosensitive coating at least in areas when viewed perpendicularly to the plane spanned by the upper side of the carrier substrate, and wherein the thermal paper and/or the thermosensitive coating can be caused to change color by the action of heat by means of a thermal print head.