BRPI0615519A2 - security sheet to protect documents - Google Patents

Abstract

Safety sheet to protect documents. The present invention relates to a security sheet for the protection of documents that presents a better protection against tampering and manipulation, and the security elements of the security sheet are positioned in such a way that they will not be on the surface bordering the document to be protected.

Description

Security sheet to protect documents.

The present invention relates to a security document sheet for protecting travel documents which offers greater protection against forgery.

In order to ensure protection against forgery, sheets for the protection of travel documents, identity documents, driver's licenses and the like are endowed with security features.

These sheets are applied directly by the issuing authority to the passport or wallet paper after the document has been individualized.

The sheets have security elements that lower nips are open and therefore, for example, through paper are a potential point of attack for counterfeiters.

The present invention has the task of providing a document protection sheet, in particular for the protection of passports, wallets and the like which has security features which after application on the document will not be on the border with the paper, thus ensuring greater protection against paper. forgery.

The object of the present invention is, therefore, a document protection security sheet which has a safety features, characterized by the fact that the security feature / features are applied so as to be protected under a protective layer and do not reach to be on the surface with the paper.

As a result, higher security is achieved against counterfeits as the security features can no longer be manipulated from the rear or top side.

The safety features are applied to the support substrate which then receives a layer of glue, for example a self-adhesive layer or a cold or hot sealing glue.

With the aid of this glue layer, the substrate bearing the respective security features can then be applied to the paper of the document to be protected.

The safety features are then under the support substrate and are not accessible for manipulation without destruction or damage to the support substrate.

Figure 1 shows a sheet according to the present invention that has been applied over a document to be protected.

In the figure, 1 is the support substrate, 2 a, b, c, d, ... are security elements, as will be described below, which may be selectively combined, 3 is a layer of adhesive and 4 is a layer of Glue.

As support substrates or support sheets, for example, preferably flexible, transparent sheets of synthetic material may be used, for example from PI, PP, MOPP, PE, PPS, PEEK, PEK, PEI, PAEK, LCP, PEN, PBT, PET, PA, PC, COC, POM, ABS1 PVC.

The backing sheets preferably have a thickness of from 5 to 700 pm, preferably from 5 to 200 pm, preferably from 5 to 50 pm.

One or more functional layers may be applied to the support substrate.

Eventually, a known adhesive agent is applied to the support substrate prior to the application of the functional layers to improve the adhesion of the functional layers.

Functional layers are visually recognizable and / or machine readable layers.

Layers may be applied by any method, for example, gravure, flexography, screen printing, digital printing and the like.

The various features may be applied to the complete or partial surface, for example, in the form of patterns, lines, letters, symbols, geometric shapes, lattices and the like.

For the application of a characteristic optical properties, paint or varnish compositions may be used. The pigments may be all known pigments, for example inorganic based pigments such as titanium dioxide, tenincide sulfide, kaolin, ITO1 ATO, FTO, aluminum, chromium silicon oxides, or organic based pigments such as phthalocyanine blue, i-indolidine yellow ??, dioxazine violet and the like and also pigment-colored and / or encapsulated in a binder agent system that dries chemically, physically or reactively. As dyes, for example, 1,1- or 1,2-chromium cobalt complexes may be used.

In that dye and / or varnish systems containing solvents may be used, aqueous and also solvents varnish systems. As binder agent various natural or synthetic binder agents may be used.

Inks or varnishes can also be applied with Luminescent DroDried. For example, phosphorescent or fluorescent, varnishes with a defined shrinkage index or tintastermochromes.

For the application of a characteristic magnetic properties paramagnetic, diamagnetic and also ferromagnetic substances such as iron, nickel and cobalt or their compounds or salts (eg oxides or sulphides) or rare earth metals such as, for example, may be used. , cobalt and samarium alloys.

Particularly suitable are magnetic pigment inks with pigments based on Faith oxides, iron, nickel, cobalt and their alloys, cobalt barium or ferrite, hard and soft magnetic iron and steel types in aqueous or solvent-containing dispersions. As solvents may be used, for example, i-propanol, ethyl acetate, methyl ethyl ketone, methoxypropanol and mixtures thereof.

Preferably, the pigments are introduced into dispersions of acrylate polymers having a molecular weight of 150,000 to 300,000, acrylate urethane dispersions, acrylate styrene dispersions, nitrocellulose or dispersions containing PVC or solvent dispersions thereof.

The magnetic layer can be applied, for example, also partially as a code, in the form of a so-called barcode which can then be read by machine.

For the application of a layer with electrical properties can be added to the paint to be applied or the varnish to be applied, for example graphite, soot, conductive organic or inorganic polymers, metal pigments (eg copper, aluminum, silver, gold, iron , chromium and the like), metal alloys such as copper and zinc or copper and aluminum, or also amorphous or crystalline ceramic pigments such as ITO, ATO, FTO and the like. They may also be used as doped or non-doped additives such as silicon, germanium or semiconductor doped or undoped polymers or ion conductors such as metal oxides or amorphous or crystalline metal sulfides. In addition, for the adjustment of the electrical properties of the layer, polar or partially polar compounds such as surfactants or non-polar compounds such as silicone additives or hygroscopic or non-hygroscopic salts may be used or varnished.

Eventually transistors in the conducting pathways may also be generated by the printing technique.

As a layer with electrical properties a partial metal layer may also be applied, and the partial application may be implemented by means of a cauterization process (application of a complete metal layer followed by partial corrosion removal) or by a demetallization.

If a demetallization process is used, a solvent-soluble paint (possibly in the form of a reverse coding) is applied as a first step, then eventually after activation of the support substrate by plasma or plasma treatment. corona, a metallic layer is applied, and then the soluble paint layer is removed by treatment with an appropriate solvent along with the metallization present in these areas.

In addition, as an electrically conductive layer, an electrically conductive polymer layer may also be applied. The electrically conductive polymers may be, for example, polyaniline or polyethylendoxythiophene or derivatives thereof.

In addition, other surface relief structures may also be used as safety features, for example diffraction grids, holograms and the like, and these structures may also sometimes be metallized or partially metallized.

These optical effect structures can be generated in all known ways. Preferably, however, these diffraction-effect structures may be generated by coating the unsupported substrate which may already have one or more of the described layers, with a radiation-solidifying varnish that is pre-solidified to the point of defrosting by activation. with radiation of a defined wavelength, and simultaneous shaping of the surface structure, after which further solidification (main solidification) of the solidifiable overlap varnish occurs by means of activation with radiation of a wavelength which is distinguished from the pre-solidification step, and then a post-solidification will eventually occur.

Radiation solidifiable varnish may be, for example, a radiation solidifiable varnish system on the base of a polyester, epoxy or polyurethane system which contains two or more different photoinitiators which are known to the art and which have wavelengths. Different types may initiate a solidification of varnish systems to different degrees. Thus, for example, a photoinitiator can be activated with a wavelength of 200 to 400 nm, the second photoinitiator can then be activated with a wavelength of 370 to 600 nm. Between the activation lengths of the two photoinitiators a sufficient difference should be maintained so that there is not too strong activation of the second photoinitiator when the first photoinitiator is being activated. The range in which the second photoinitiator is activated should be within the transmission wavelength range of the supporting substrate used. For the main solidification (activation of the second photoinitiator) electron radiation can also be used.

As a radiation solidifiable varnish a water-dilutable varnish may also be used. Preferred are polyester lacquer systems.

The configuration of the surface structure, that is, the diffraction, bending or embossing surface, occurs, for example, at a temperature controllable by means of a matrix or by using a stamping mold in the radiation-solidifiable lacquer layer which upon activation of the surface. The first photoinitiator has already solidified to the point of gelation and is at this stage at the time of molding.

If a water-soluble varnish which is solidifiable under radiation is used, a pre-drying may be connected to the front, for example by infrared radiation.

The thickness of the radiation-solidifiable applied varnish layer may vary according to the requirements of the final product and the thickness of the substrate, and is generally between 0.5 and 50 pm, preferably between 2 and 10 pm, especially preferred between 2 and 5 pm.

The embossing mold may be transparent, it may be a welded or glued metal sleeve or a seamless metal or synthetic sleeve sleeve. Preferably, nickel sleeves are used. In order to obtain an accurate stamping of the surface structure, it is recommended to mount the stamping tool on a temperature-controlled, refrigerated or chain-heated pneumatic clamping cylinder.

In this case, the support substrate is contacted with the temperature controlled clamping cylinder, and surface embossing preferably occurs only when the substrate coated with the radiation solidifiable varnish is in contact with the cylinder.

This is an exact control of the process parameters such as Dressão and Darticular temperature, to avoid changing the state of the varnish layer too fast or too slow.

In this the solidification of the ultraviolet varnish occurs and then further solidification.

As a reflection layer for the optical-giving structures, both the conductive metallic layer and the metallic or apparently metallic coating can be used. It is also possible to use as a reflection layer a High Refraction Index layer.

Characteristics can also be applied that under different viewing angles show different color effects (wobbling color effects).

These characteristics then consist of at least one reflective layer of electromagnetic waves, a distancing layer and a layer formed by metallic groupings.

In this case, advantageously first a partial or complete electromagnetic wave reflector layer is placed, and then one or more partial and / or complete polymer layers of defined thickness. Then, above the spacer layer is placed a layer formed by metallic clusters, which are produced by vacuum technique processes or solvent-based systems.

Eventually, biomarkers may also be applied in the form of DNA codings which may also be present on the glue coating or transfer varnish.

The layer structure is then equipped with a protective layer. As a protective layer a known protective varnish coating or a protective sheet can be used.

For improved adhesion, a layer of known adhesive may also be placed.

The protective layer may also be a glue coating ((co) extrusion layer, self-adhesive coating, cold or hot sealing glues).

When a protective varnish layer or protective sheet is used, then the respective coating of glue is applied over the protective varnish layer. The protective varnish layer may also be a layer with different areas of adhesion, in which case When manipulating, for example, removing the safety sheet from the substrate, the safety element is destroyed.

Claims (7)

1. Document protection security sheet that has one or more security features, characterized in that the feature / features are introduced securely under a protective layer and do not lie on the boundary surface like paper. Security sheet according to Claim 1, characterized in that the protective layer consists of a protective protective layer or a protective sheet. Safety foil according to Claim 1, characterized in that the protective layer consists of a glue coating. Safety foil according to Claim 2, characterized in that an adhesive coating is applied to the protective layer. 5. Safety sheet according to one of Claims 1 to 4, characterized in that the safety sheet has complete and / or partial functional layers. Safety sheet according to one of Claims 1 to 5, characterized in that the functional layers have optically active, optically variable, electrically conductive and / or magnetic properties. Valuable documents having a security sheet according to one of claims 1 to 6.