Heat-sensitive recording sheet with a security element in the form of pressure-sensitive microcapsules
AssigneeMitsubishi HiTec Paper Flensburg GmbH
InventorErich Kranz
Life of this patent
Estimating the term…
Abstract
A heat-sensitive recording sheet having a substrate with a heat-sensitive recording layer which contains color formers and color acceptors which react with one another under the action of heat. In order to permit the detection of counterfeited documents without the additional use of aids such as UV lamps or chemicals, present in the heat-sensitive recording layer, as a security element, are pressure-sensitive microcapsules which contain one or more color formers in a solvent. The color formers react with the color acceptors, forming a color, after destruction of the microcapsules.
Claims10
A heat-sensitive recording sheet, comprising:
- a substrate;
- a heat-sensitive recording layer which is applied to one side of the substrate and which contains color formers and color acceptors which react with one another under the action of heat in order to produce a text image;
- and
- a security element, the security element comprising pressure-sensitive microcapsules which are present in the heat-sensitive recording layer and which contain at least one color former in a solvent, said color formers reacting with the color acceptors so as to form a color marking after destruction of the microcapsules.
Dependencies are inferred from the claim text.