Heat-sensitive recording materials and method for authenticity checking
First Claim
1. A heat-sensitive recording material with security feature, comprising:
- a carrier paper with a recording layer arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated; and
a security feature provided as a water-soluble dye which fluoresces under UV radiation, the dye being applied without binder in a pattern, invisible under daylight, to a surface of a face of the carrier paper opposite the face provided with the recording layer, so that the entire surface has the pattern, the water-soluble dye being applied at a mass per unit area between 0.01 and 40 mg/m2.
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Accused Products
Abstract
A method of checking the authenticity of a heat-sensitive recording material having a carrier paper with a recording layer which is arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated; and a security feature provided as a water-soluble dye which fluoresces under UV radiation, the dye being applied without binder in a pattern, invisible under daylight, to a surface of a face of the carrier paper opposite the face provided with the recording layer, so that the entire surface has the pattern, the water-soluble dye being applied at a mass per unit area between 0.01 and 40 mg/m2, the method comprising the step of wetting the surface of the layer opposite the recording layer with an alkaline substance.
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Citations
14 Claims
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1. A heat-sensitive recording material with security feature, comprising:
- a carrier paper with a recording layer arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated; and
a security feature provided as a water-soluble dye which fluoresces under UV radiation, the dye being applied without binder in a pattern, invisible under daylight, to a surface of a face of the carrier paper opposite the face provided with the recording layer, so that the entire surface has the pattern, the water-soluble dye being applied at a mass per unit area between 0.01 and 40 mg/m2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a carrier paper with a recording layer arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated; and
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13. A method of checking the authenticity of a heat-sensitive recording material having a carrier paper with a recording layer which is arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated;
- and a security feature provided as a water-soluble dye which fluoresces under UV radiation, the dye being applied without binder in a pattern, invisible under daylight, to a surface of a face of the carrier paper opposite the face provided with the recording layer, so that the entire surface has the pattern, the water-soluble dye being applied at a mass per unit area between 0.01 and 40 mg/m2, the method comprising the step of wetting the surface of the layer opposite the recording layer with an alkaline substance.
- View Dependent Claims (14)
Specification