AT501989A1 - SAFETY FEATURES WITH CHARACTERISTICS VISIBLE UNDER A SPECIFIC OVERVIEW - Google Patents

Description

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Security feature with visually recognizable features under a certain viewing angle

The invention relates to a security feature with under certain viewing angles, especially in transmitted light optically recognizable features.

From EP 330 733 B1 a security element in the form of a thread or tape for embedding in security documents is known, which consists of a translucent plastic film which is provided with an opaque coating and has recesses, wherein at least in the areas congruent to the recesses areas and color / or luminescent substances are present which differ under suitable light conditions from the opaque coating in a color contrasting form.

From EP 613 786 AI security elements in the form of security threads are known which have a covered substrate in the form of a grid, wherein recesses in the form of characters, patterns or the like are provided.

The object of the invention was to provide a security element which has optically recognizable features, for example in the form of characters, letters, patterns, lines and the like, at a certain viewing angle, in particular in transmitted light, and optionally additionally has functional features.

The invention therefore relates to a security element which has optically recognizable features at a defined viewing angle, characterized in that the optically recognizable features are formed by two or more layers applied in the register.

The layers printed in the register may optionally be separated by spacer layers.

The carrier substrates are, for example, carrier foils, preferably flexible transparent or translucent plastic foils, for example of PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS , PVC in question.

The carrier films preferably have a thickness of 5 to 700 μm, preferably 5 to 200 μm, more preferably 5 to 50 μm.

The carrier substrates may additionally have a lacquer layer which may be unstructured or structured, for example embossed or may have diffraction gratings. The lacquer layer may, for example, be an adhesive lacquer layer or a release-capable transfer lacquer layer, it may be crosslinked or crosslinkable by radiation, for example UV radiation, thermally or reactively, and additional properties, such as e.g. Scratch-resistant and / or antistatic equipment or have chemical resistance. Both aqueous and solvent-based coating systems are suitable, in particular coating systems based on PE acrylate, PET acrylate, urethane acrylate, PVC, PMMA or epoxy acrylate.

A partial layer of a preferably opaque ink or lacquer is printed on the carrier substrate or on coatings which may already be present on the carrier substrate. In one or more further layers further elements are then applied in register and in such a way that the elements complement each other when viewed in transmitted light to an optically recognizable feature.

An example of such a layer arrangement is shown in FIG.

The first partial layer as well as the layers printed in the register can either be the same or different. The layers may be either metallic or metallic appearing layers, black or colored layers. In this case, different colors can also be used in particular in the individual layers, whereby, depending on the choice of colors when viewed at different viewing angles, either characteristic mixed colors can result or a light extinguishment occurs.

Examples of such layer structures are shown in FIGS. 2 and 3.

1 means the carrier substrate, 2 for example a red layer, 3 for example a green layer and 4 a spacer layer.

In Fig. 2, when viewed at an angle of 90 °, the printing appears in color, at an angle of < 90 ° (as shown) how the print appears black.

In Fig. 3, when viewed at an angle of 90 °, the printing appears black, at an angle of < 90 ° (as shown), the print appears in the respective applied color.

Optionally, the layers printed in the register may also have additional functional features, such as electrically conductive and / or magnetic properties, thereby providing an additional machine-readable identification feature.

To adjust the electrical properties of the applied color or the applied paint, such as graphite, carbon black, conductive organic or inorganic polymers, metal pigments (for example, copper, aluminum, silver, gold, iron, chromium and the like), metal alloys such as copper-zinc or Copper-aluminum or amorphous or crystalline ceramic pigments such as ITO, ATO, FTO and the like can be added. In addition, doped or non-doped semiconductors may also be used. For example, silicon, germanium, or doped or undoped polymeric semiconductors or ionic conductors such as amorphous or crystalline metal oxides or metal sulfides may be used as an additive. *** " Furthermore, polar or partially polar compounds such as surfactants, or nonpolar compounds such as silicone additives or hygroscopic or non-hygroscopic salts can be used or added to the paint for adjusting the electrical properties of the layer.

Furthermore, an electrically conductive polymer layer can also be applied as the electrically conductive layer. The electrically conductive polymers may be, for example, polyaniline or polyethylenedioxythiophene and its derivatives. Particular preference is given to using PEDT / TS or PEDT-methanol as electrically conductive polymer.

To adjust the magnetic properties, paramagnetic, diamagnetic and also ferromagnetic substances, such as iron, nickel, barium, and cobalt or their compounds or salts (for example, oxides or sulfides) can be used. Particularly suitable are Fe (II) and Fe (III) oxides, barium or cobalt ferrites, rare earths and the like.

It is also possible to use the magnetic ink used, for example, carbon black or graphite, whereby a simultaneously magnetic and electrically conductive layer can also be produced in a defined coding.

However, these layers printed in the register can also be separated by transparent spacer layers.

Suitable spacers are, for example, layers having optical properties (color, luminescence, pearlescence), optically active properties (diffraction gratings, holograms), optically variable properties (color or lacquer with optically variable pigments) or electrically conductive polymer layers. Furthermore, as

Spacer layer and a transparent optionally colored carrier substrate, which optionally also has functional layers can be used.

The optical properties of a further layer can be visualized by visible dyes or pigments, luminescent dyes or pigments which fluoresce or phosphoresce in the visible, in the UV region or in the IR region, effect pigments, such as liquid crystals, pearlescent, bronzes and / or Multilayer color change pigments and heat-sensitive colors or pigments influence. These are replaceable in all possible combinations. In addition, phosphorescent pigments can also be used alone or in combination with other dyes and / or pigments.

Furthermore, surface relief structures, for example diffraction gratings, holograms and the like, may also be used as the spacer layer, wherein these structures may optionally also be metallised or partially metallised.

For the production of such surface structures UV-curable deep-drawable lacquer is applied for the time being. Subsequently, for example, a surface structure by molding a die in this paint, which is pre-cured at the time of molding to the gel point, prepared, after which the radiation-curable coating is completely cured after application of the surface structure.

Due to the use of the UV-curable lacquer, layers which have been applied thereto after curing, and also an optionally introduced surface structure, are stable even under temperature load.

When viewed perpendicularly in transmitted light, the film material then displays the feature applied in several layers to form patterns, characters, letters and the like. If the film material is not perpendicular, but at an angle < 90 °, this results in additional transmission paths for the penetrating light. The contrast between the opaque multi-layer printing and the recesses is reduced; depending on the spacer layer used, additional defined effects occur, for example optical effects (luminescence upon excitation, metallic luster), optically variable or optically active effects.

Furthermore, additional layers with electrically conductive and / or magnetic properties can also be present on the substrate, or can subsequently be applied.

The security element according to the invention may be provided on one or both sides with a protective lacquer layer, which may optionally be pigmented.

Furthermore, the security element according to the invention can optionally be laminated with one or more carrier substrates, which optionally have functional and / or decorative layers, using a laminating adhesive.

Furthermore, the security element according to the invention can be provided on one or both sides with a hot or cold seal adhesive or a self-adhesive coating for application to or for embedding in a substrate, wherein these adhesives or adhesive coatings can be pigmented.

The security elements or the film material may therefore be suitable as security features in data carriers, in particular value documents such as identity cards, cards, banknotes or labels, seals and the like, but also as packaging material, for example in the pharmaceutical, electronics and / or food industries, after appropriate packaging. For example, in the form blister sheets, cartons, covers, film packaging and the like. For use as security features, the substrates or 048 film materials are preferably cut into strips or threads or patches, the width of the strips or threads preferably being 0.05-10 mm and the patches preferably having average widths or lengths of 2 -30 mm. For use in or on packages, the film material i is preferably cut into strips, tapes, threads or patches, wherein the width of the threads, strips or tapes is preferably 0.05-50 mm and the patches preferably average widths and lengths of 2-30 mm.

A corresponding security thread or strip can also be used as edge reinforcement of packaging, documents of value and the like in the region of the edges but also, for example, as longitudinal or transverse reinforcement in the packaging or in the document of value, whereby in each case a plurality of threads or strips at a defined distance from one another can be provided.

Claims (1)

Claims 1. A security element, a security element, a security element, a security element, a security element, a security element, and a security element. which has optically recognizable features at a defined viewing angle, characterized in that the optically recognizable features are formed by two or more layers applied in the register. 2) A security element according to claim 1, characterized in that one or more of the layers applied in the register are separated by spacer layers. 3) Security element according to one of claims 1 or 2, characterized in that the applied in the register layers consist of an opaque paint or an opaque lacquer. 4) Security element according to one of claims 1 to 3, characterized in that the applied in the register layers consist of the same or different colors or paints. 5) Security element according to one of claims 1 to 4, characterized in that the layers applied in the register of the same or different metallic and / or metallic appearing layers and / or consist of the same or different colored layers. 6) Security element according to one of claims 2 to 5, characterized in that the spacer layers have optical, optically active, and / or optically variable properties. 7) Security element according to one of claims 2 to 6, characterized in that the optically recognizable features applied in several layers features in transmitted light when viewed perpendicularly complement each other to characters, patterns, lines, letters and the like. 8) Security element according to one of claims 2 to 7, characterized in that when viewed at an angle of < 90 ° additional effects are visible, whereby the contrast between opaque coating and recesses is reduced. 9) Security element according to one of claims 1 to 8, characterized in that the security element is laminated with one or more carrier substrates, which may have further functional and / or decorative layers. 10) Security element according to one of claims 1 to 9, characterized in that the security element is provided on one or both sides with a protective lacquer layer. 11) Security element according to one of claims 1 to 10, characterized in that the security element is provided on one or both sides with a hot or cold seal adhesive coating or a self-adhesive coating. 12) film material for the production of security elements according to one of claims 1 to 11. 13) film material for the production of security elements according to one of claims 1 to 11. 14) value document containing a security element according to one of claims 1-11. 15) Packaging containing a security element according to one of the claims 1 -11. 16) Use of the security elements according to one of claims 1 to 11 as security features in securities, documents of value, data carriers on packaging and the like.