Security paper, value document obtainable therefrom and method for manufacturing said paper and document

Abstract

A security paper for manufacturing value documents has a planar substrate equipped on one surface with an anti-forgery means based on a carrier foil having an optically variable security feature. The anti-forgery means and a partial substrate area surrounding the anti-forgery means is furnished with a dirt-repellent radiation-curing first lacquer substantially not influencing the perceptibility of the optically variable security feature. The layer thickness of the lacquer lying is in a range of 0.7 to 2 micrometers. The radiation-curing first lacquer is may be a UV-cross-linking lacquer which after cross-linking is high-gloss. The substrate can be furnished on its surface lying outside the anti-forgery means with a dirt-repellent second lacquer and optionally partly overlaps the first lacquer in the region of the partial substrate area surrounding the anti-forgery means. The second lacquer involves either a physically drying, water-based dispersion lacquer, or a UV-cross-linking lacquer, and has a matt impression.

Claims

1. A security paper for making a value document and having a planar substrate which is equipped on at least one surface with at least one anti-forgery means, wherein the anti-forgery means comprises a carrier foil which is visually recognizable to a viewer at least in some regions and has an optically variable security feature, and the anti-forgery means and a partial substrate area surrounding the anti-forgery means are directly furnished, for extending life and fitness for circulation, with a dirt-repellent radiation-curing first lacquer which preserves perceptibility of the optically variable security feature, the layer thickness of said lacquer lying in a range of 0.7 to 2 μm, wherein the anti-forgery means is present in the form of a security strip or security thread being surrounded by the partial substrate area furnished with the first lacquer on two sides or in the form of a patch being surrounded by the partial substrate area furnished with the first lacquer on four sides, and wherein the partial substrate area surrounding the anti-forgery means has a width of 0.3 to 10 mm.

2. The security paper according to claim 1, wherein the radiation-curing first lacquer is a UV-cross-linked lacquer which is high-gloss.

3. The security paper according to claim 1, wherein the substrate is furnished on its surface lying outside the anti-forgery means with a water-based primer layer which optionally partly overlaps the dirt-repellent radiation-curing first lacquer, in the region of the partial substrate area surrounding the anti-forgery means, and the primer layer is optionally furnished with a UV-cross-linking lacquer forming a cover layer, which protects the substrate from physical and chemical influences.

4. The security paper according to claim 1, wherein the substrate is furnished on its surface lying outside the anti-forgery means with a dirt-repellent second lacquer which optionally partly overlaps the dirt-repellent radiation-curing first lacquer, in the region of the partial substrate area surrounding the anti-forgery means, and either (a) involves a physically drying, water-based dispersion lacquer which can optionally contain cross-linking agent and after drying has a matt impression having a gloss of less than 20 gloss units at 60°, measured by means of gloss meters according to DIN standard 67530, or (b) involves a UV-cross-linking lacquer which after cross-linking has a matt impression having a gloss of less than 20 gloss units at 60°, measured by means of gloss meters according to DIN standard 67530.

5. The security paper according to claim 4, wherein the dirt-repellent second lacquer involves a physically drying, water-based dispersion lacquer which cures through removal of the dispersant and is an aqueous dispersion of a polyacrylic resin and/or of a polyurethane resin.

6. A security paper according to claim 1, wherein the substrate is printed with signs or patterns on its surface lying outside the anti-forgery means or on the surface of a dirt-repellant second lacquer lying outside the anti-forgery means.

7. The security paper according to claim 6, wherein the substrate is furnished on its surface lying outside the anti-forgery means with a water-based primer layer which optionally partly overlaps the stated dirt-repellent radiation-curing first lacquer in the region of the partial substrate area surrounding the anti-forgery means, and the substrate is printed with signs or patterns, and the primer layer is furnished with a UV-cross-linking third lacquer forming a cover layer, which protects the substrate from physical and chemical influences.

8. The security paper according to claim 1, wherein the optically variable security feature has microstructures and micro-imaging elements for magnified imaging of the microstructures.

9. A security paper for making a value document and having a planar substrate which is equipped on at least one surface with at least one anti-forgery means, wherein the anti-forgery means comprises a carrier foil which is visually recognizable to a viewer at least in some regions and has an optically variable security feature, and the anti-forgery means and a partial substrate area surrounding the anti-forgery means are directly furnished, for extending life and fitness for circulation, with a dirt-repellent radiation-curing first lacquer which preserves perceptibility of the optically variable security feature, the layer thickness of said lacquer lying in a range of 0.7 to 2 μm, wherein the anti-forgery means is present in the form of a security strip or security thread being surrounded by the partial substrate area furnished with the first lacquer on two sides or in the form of a patch being surrounded by the partial substrate area furnished with the first lacquer on four sides, and wherein the partial substrate area surrounding the anti-forgery means has a width of 0.3 to 10 mm, and wherein the optically variable security feature has microstructures and micro-imaging elements for magnified imaging of the microstructures.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) There are shown:

(2) FIG. 1 a schematic representation of a security paper having an embedded windowed security thread and a glued-on, patch-shaped security element;

(3) FIG. 2a the enlarged region II in plan view, with the wobble zone of the thread being schematically illustrated;

(4) FIG. 2b the enlarged region II in plan view, with the extension of the first lacquer layer being schematically illustrated; and

(5) FIG. 2c the enlarged region II in plan view, with the extension of the second lacquer layer being schematically illustrated.

DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS

(6) FIG. 1 shows a schematic representation of a security paper 1 which is furnished with an embedded windowed security thread 2 and a glued-on patch-shaped security element 3. The security paper 1 furthermore has the denomination “100” in the form of a watermark. The windowed security thread 2 (in the present case a microlens thread) and the security element 3 (in the present case a micro-optic representation arrangement with microstructures as well as concave micromirror arrays for magnified imaging of the microstructures) respectively convey a different pictorial impression to the viewer from different viewing angles. The windowed security thread 2 represented by dashed lines emerges on the surface of the security paper 1 at the window regions 4 while being embedded in the interior of the security paper 1 at the bar regions therebetween.

(7) The patch-shaped security element 3 and the windowed security thread 2 are respectively furnished with a dirt-repellent radiation-curing first lacquer substantially not influencing the perceptibility of the optically variable effect. In the present example, the first lacquer is a UV lacquer based on the above-described composition 1, and is applied to the security paper in the regions 5 and II by flexographic printing or offset printing. The first lacquer is not applied above the anti-forgery means 2 and 3 in exact register, but rather the lacquer also covers bordering parts of the security-paper substrate that surround the anti-forgery means 2 and 3 and form, so to speak, edge regions for the anti-forgery means 2 and 3. The layer thickness of the first lacquer amounts to 1.5 μm in the present example.

(8) The security paper 1 is furnished in its surface lying outside the anti-forgery means 2 and 3 over the full area with a dirt-repellent second lacquer which partly overlaps the first UV lacquer in the region of the partial substrate areas surrounding the anti-forgery means 2 and 3. In the present example, the dirt-repellent second lacquer is based on a physically drying aqueous dispersion lacquer, preferably applied by means of flexographic printing, according to the above-described composition 2.

(9) The spatial arrangement of the first UV lacquer and of the second physically drying aqueous dispersion lacquer on the security paper 1, and the term “partly overlap”, will be explained more closely hereinafter with respect to the anti-forgery means 2 with reference to FIGS. 2a to 2c.

(10) FIG. 2a shows the enlarged detail II of FIG. 1 in plan view. The windowed security thread 2 emerges on the surface of the security paper at the window regions 4 while being embedded in the interior of the security paper at the bar regions therebetween. In order to avoid unwanted thickening (and thus poor flatness of the paper sheets) at the places of the security thread when papers of value are stacked, the incorporating of the security thread into the paper during the paper manufacture is effected by means of the wobbling technique known in the prior art. The term “wobbling” designates in this connection a periodic fluctuation of the security thread upon embedding into the paper of several millimeters perpendicular to the thread direction, so as to form certain wobble zones 6 within which the security thread comes to lie.

(11) The windowed security thread 2 and a partial substrate area surrounding the windowed security thread 2 are furnished, for extending life and fitness for circulation, with the above-described dirt-repellent radiation-curing first lacquer 7 substantially not influencing the perceptibility of the optically variable security feature (see FIG. 2b).

(12) The security paper 1 has on its surface lying outside the windowed security thread 2 the above-described dirt-repellent second lacquer 8 which partly overlaps the first lacquer 7 in the region of the partial substrate area surrounding the windowed security thread 2. The overlap regions are designated with the reference number 9 (see FIG. 2c).