MXPA06005076A - Security document, method for producing a security document and the use of a security element - Google Patents

Abstract

Security document, such as a banknote, a value paper, an identification document, an access card, a security label or packaging, comprising an imprint-able substrate, chosen from the group of papers, cardboards, textiles and polymer sheets, as a first constituting part, and at least a second constituting part, chosen from the group of printing inks, security threads, windows, fibers, planchettes, foils, and decals, wherein a same security element is contained at least a first time in or on one of its constituting parts, and at least a second time in or on another of its constituting parts. Method for producing a security document, characterized in that a same security element is applied at least a first time in a first step to one constituting part of said document, and at least a second time in a second step to another constituting part of said document.

Description

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SECURITY DOCUMENT, METHOD TO PRODUCE A SECURITY DOCUMENT AND THE USE OF A SECURITY ELT Field of the Invention The invention is in the field of security documents, such as banknotes, papers with value, identity, documents for access or certification, labels or security packaging and the like. Security documents are provided which have improved resistance against forgery, in particular, forgery that involves derivation of elts (paper, ink, etc.), from the manufacturing chain of the security document, through a custom design of the "security chain" with the aid of communication security features or elts, as well as a method of producing said elts and the use of security elts for related security features in accordance with the independent patent claims.

BACKGROUND OF THE INVENTION Security documents, in particular, long-term security documents, which require high resistance against forgery, such as banknotes or identity documents, are usually protected by several layers of different security elts (security features). , which are chosen from different fields of different technology, manufactured by different suppliers, and included in different constituent parts of the security document. To break the security document, the forger would need to obtain all the materials involved and get access to all the required technology, which is a barely workable task. The manufacture of a ticket, as an example, requires a special paper currency (which may contain watermarks, security threads, fibers, paper planchette, luminescent particles, windows, sheets, decals, coatings, etc.), which it must be printed with special inks (which may contain additional security dyes, pigments and security additives), using engravings and other high security printing equipment. Contrary to commercial printing applications, security prints rely on several different printing techniques combined together in the same document. More recently, the tickets also contain particular sheets and other aggregates, which must be applied by dedicated team. The materials and equipment needed to make a ticket are only available from specialized suppliers, and the ticket can only be produced in a high security printing job by expert operators. The security thread is another traditional elt of anti-counterfeiting paper for banknotes and other security documents. The inserted security threads are particularly difficult to forge, because i) they can not be produced by the substrate or paper manufacturer, but i) they need to be incorporated into the printing substrate in the paper mills, during the substrate manufacturing. This necessary access to two different technologies of manufacturing is a fence that most counterfeiters in the past were unable to take; they were thus forced to either imitate the thread of security by a printed falsification, easily discovered, or divert or steer the role of authentic security. The latter is currently becoming a particular threat to security documents. The first generation security threads for coins, were a strip of metalized polymer or metal, completely inserted inside the paper money, and capable of authenticating it either by looking at it against the light, or detecting its electrical or magnetic properties with the help of a corresponding device . More sophisticated versions of the security threads include the window threads described in EP 059 056 Al (A. J. Tooth and N. Pas); EP 518 740 Bl (M. Camus); EP 625 431 Bl (H. Mück and S. Harms) and others. The window yarn is partially inserted into the paper and partially left open on the surface of the paper, and therefore, allows a direct visual authentication of the evident security characteristics of the yarn in the places where it appears on the surface of the paper. As a direct consequence of this visual authentication capability, a high number of printed and / or selectively demetallised threads have been described in the art, which are now extensively used in the paper money industry (see for example, H. Mück and S. Harms, EP 625 431 Bl). To protect the printed or otherwise incorporated security elements from the security threads, the threads are preferably manufactured as a laminated interleaving, having the security elements contained within - two thin layers of polyester sheet or other material adequate plastic Such laminated yarns were described by W. Kaule et al. in US 5,324,079 and US 5,509,691. Laminated yarns of similar E or UV beams were further described by J. Hilburger et al. in EP 1 348 576 A2. Said laminated yarns may comprise all types of security elements such as infrared absorbers, luminescent compounds, magnetic compounds, metallic layers and optically variable layers. A particular laminated window yarn, comprising an optically variable interference coating, has been described by J. N. Disano et al. in US 6,447,630. Said interference coating is manufactured by high-vacuum deposition of a multi-layer interference stack on a carrier plastic sheet, and subsequently protected by laminating a second sheet of plastic thereon. The paper currency contains said optically variable thread which changes color depending on the viewing angle, is currently manufactured by the Canadian company AGRÁ Vadeko Inc., and has been used for almost a number of coins, among others, the 100 NTD (New Taiwanese dollar), which contains a thread that changes from magenta to green. Vadeko window yarn is available in a number of different base colors with its corresponding color changes. There is really much concern in the issuing body about the security of the resources of the different elements which are put together in the manufacture of currency or other security documents. Such can be caused with the help of mutually corresponding (communication) security elements (characteristics), that is, intentionally creating a correspondence between two or more security elements, introduced in different stages and production sites in different constituent elements of the document of security. WO 98/55333 A1, discloses a security document, which has a window thread that matches the color and brightness of its surroundings (ie, paper money), in the range of the visible spectrum, thus remaining invisible to the unattended eye, and which additionally comprises a non-obvious security element for authentication purposes, such as a luminescent compound, which, after excitation with UV light, emits longer wavelength light inside or outside the visible spectral range. Said security thread, however, does not allow immediate visual detection of a deviated paper currency, or the like. Another example of communication security features or features is the "self-verifying security document", described by JC Taylor et al., In WO 98/15418 A1: A security document, such as a banknote, comprises a security document. plastic window and printed marks on a substrate. The plastic of said window contains a dye, which represents an optical filter, and said marks are printed as a pair of metameric color, that is, using two slightly different color inks, which are not distinguished by the unassisted human eye (for example, a first yellow and a second yellow). If said plastic window of the bill is now folded back over said metameric printed mark, some of them remain visible, and some others disappear, because the light reflected in it is filtered by the plastic window. For the effect of "self-checking" to function properly, the dye in the plastic window (which is introduced during the manufacture of the substrate), - and the pair of metameric pigments in the printing inks (provided by the manufacturer of the ink and applied in print jobs), should correspond. The implementation of communication security features may be of particular value in the case of optically variable ink (OVI®) in coins. The OVI® communication security features, should significantly allow a quick double visual verification of a paper currency authentication. The aforementioned 100 NTD bill (New Taiwanese Dollar) contains, in addition to said window thread that changes from magenta to green, as well as an OVI® denomination of "100" printed in magenta to green engraving. However, the correspondence of both security elements, ie their equalization with respect to the color and color change dependent on the angle, is not sufficient to allow cross-authentication. This is a consequence of the fact that both security elements were independently selected from each other, and are, therefore, of different specification and nature. Significantly, said optically variable security thread comprises an original, homogenous thin film multilayer interference stack. Optically variable print printing, on the other hand, comprises an imperfectly reconstituted layer of thin film interference platelets of the optically variable pigment. The only observation that an alert user can make by looking and tilting the 100 NTD bill is that there is a change from magenta to green in both the thread and the denomination. It will not be able, however, to determine if both optically variable safety elements correspond, in the sense that they can be traced back to the same common source. It may be highly desirable, to track the authenticity of the various constituents that enter the manufacture of a ticket, such as paper, printed inks and various aggregates, have the same security element applied to several of these constituents in different places , for example, an ink containing an optically variable security element could be present a first time in or on the security thread, and a second time in the form of an appropriate printed design on the ticket substrate, in such a way that You can make a visual, easy comparison of both. This will be able, among other benefits, to allow a better control and personalized design of the manufacture of the substrate of the ticket for editions and denominations of certain currencies, and therefore, help the emitting organisms to fight against the paper money and derivation of ink.

SUMMARY OF THE INVENTION The present invention describes a security document, which has communication security features included as security elements in or on its different constituents. Said security element may be comprised in an ink or coating composition and may be of the obvious type (i.e., visible to the unassisted human eye) or not obvious (that is, visible or detectable only with the help of an instrument). Preferably, said security elements are chosen from the group of optically variable elements, such as multilayer thin film interference pigments. Its double incorporation allows establishing an unambiguous link between the coin substrate and / or a constituent thereof, such as security threads, fibers, planchette paper, a window, a sheet or a decal, and / or printed markings applied to said coin substrate. Said communication security features are included by security elements which are introduced at least twice, typically a first time during the manufacture of the substrate or a constituent of the substrate, and a second time via an ink or coating during the printing of the substratum. The communication security features can be elaborated by the client and / or specific application, to a degree that a derivation or forgery of a constituent part of the security document, such as the ink or the printing substrate, will become immediately evident. to the unattended human eye, in the case of an evident characteristic, or easy to recognize them with the aid of a corresponding device in the case of a non-evident characteristic. The present invention thus relates to a security document that carries communication security features, which allow immediate instrumental or visual detection of derived coin constituents, such as paper, ink or sheets, as well as a method for producing said security document and the use of security elements as a security feature. More particularly, a security document is described wherein a single security element based on ink, preferably an optically variable element, is contained for the first time on or in the substrate of the security document or on or within a constituent thereof. such as a security thread, a window, a sheet, etc., and a second time in an ink or a coating printed on said substrate of the security document. Said substrate can by this means be a paper, a cardboard, a textile, a substrate based on polymer. Throughout the present description, the term "security element" should be used for a particular material, such as a thin film interference pigment, a luminescent material, a spectrally selective absorber, etc., which can be incorporated in a security document for authentication purposes. The term "identifiable properties" should encompass, in the sense of the present invention, the visual and / or other effective, exhibited by a security element, such as a color change dependent on the angle, light emission, reflection, electrical properties or magnetic, absorption, temperature-dependent changes and other physical phenomena which can be identified by a sensor or by the human, particularly by the human eye. According to the invention, a security document, such as a banknote, a valuable paper, an authentication document, an access card, a security label or packaging, comprising a substrate, chosen from the group of papers, cardboard , textiles and sheets of polymers, as a first constituent part, and at least one other constituent part, chosen from the group of printing inks, security threads, windows, fibers, plank paper, sheets and decals. Said security document has a first security element applied or added to one of its constituent parts, and said security element has identifiable properties. These properties can be the change of color depending on the angle of vision of variable optical pigments, the change of color of a thermochromic or photochromic material, or the form of a hysteresis of a magnetic material and serve as a first security feature in the document of security. The term "add a security element to a constituent part" must include, in particular, joining or incorporating a security element in said constituent part. At least one additional security element is. applied or added in at least one other constituent part of the security document, which has substantially the same properties as the first security elements. These other security elements serve as a second security feature to the security document. In this text, the term "substantially the same" means that, for example, the color dependence of the viewing angle of the variable optical pigments or the shape of the magnetic hysteresis, is the same within the maintenance of specifications for the document of security, even if the security elements were not manufactured in the same way. In addition, the security elements are applied or added to the constituent parts of the security element in such a way that their properties can be compared. This comparison serves as a third security feature, as it is directly possible to identify the correspondence between the security elements. If the security elements differ in their chemical or physical composition, they should be achieved that have, however, comparable properties which can be used for authentication purposes as discussed in this document. It is preferable that the security element applied or added to different constituent parts of the security element be materially the same, which means that they not only have the same identifiable properties, but also the same chemical and / or physical composition. At least one of said security elements is furthermore preferably contained in an ink or coating. The coating compositions have the advantage that they can be formulated for application in a great variety of different materials, which therefore represent, an ideal choice for the requirement, at least two vectors for said security element. A vector for a security element is understood in this document, as a carrier material comprising the security element, and which allows it to be applied. In a particular embodiment, at least one of said security elements is applied or added for the first time to the substrate itself or to a constituent thereof, chosen from the group of security threads, windows, fibers, planchette paper, sheets and decals. Said document may in this document, further comprise a laminated interposed laminated polymer structure and coating layers. The UV-bonded or laminated polymer-coating-polymer interleaving sheets, as described in US 5,324,079; US 5,509,691 and EP 1 348 576 A2, have the advantage of protecting the security elements included inside, from adverse influences of the environment, in particular, those that originate during the process of manufacturing the substrate, for example, where a Security thread is incorporated into a printing substrate. Said security elements, however, can also be contained for the first time in a coating applied to said substrate during its manufacturing process in the paper mill, for example, in accordance with the description of EP 490 825 Bl. Said security element is preferably contained said second time in an ink or coating printed on said substrate capable of being printed by the security printer. Said security printer is generally the completion stage in the manufacturing chain of the security document, and for this reason, the preferred stage for closing the security chain by said second application of the security element. Said security elements may be of an evident nature (that is, visible to the unassisted human eye) or non-obvious (ie, visible with the aid of an instrument); preferably, they are chosen from the group comprising optically variable pigments, multilayer thin film interference pigments, liquid crystal pigments, holographic pigments and coated interference particles. More preferably, they are chosen from the group of multilayer thin film interference pigments, more preferably from the group of pigments having a reflector (metal) / dielectric / absorber intercalation structure. Said security elements can, however, also be chosen from the group comprising thermochromic and photochromic pigments. In addition, they can be chosen from the group comprising luminescent compounds, infrared absorbers, UV absorbers, and magnetic absorbers. Still further, they can be chosen from the group of non-obvious security elements, which comprise micro-textured or micro-lamellated lamellae pigments and forensic marking compounds. The ink or coatings containing said security elements may additionally contain all types of evident and non-obvious security elements. The design elements, such as motifs, marks, guilloche, badges, etc., can also be introduced in said at least two vectors of the security element, to intensify the communication between them. Furthermore, a method for producing a security element, such as a banknote, a valuable paper, an identification document, is described. an access card, a security label or packaging, comprising a substrate capable of being printed, chosen from the group of papers, cartons, textiles and sheets of polymers, as a first constituent part, and at least a second constituent part, chosen from the group of printing inks, security threads, windows, fibers, planchette paper, sheets and decals. According to said method, a security element having identifiable properties is applied or added to a constituent part of said document, and at least one additional security element having substantially the same identifiable properties is applied or added to at least one other constituent part of said document, in such a way that the comparison of the identifiable properties is possible. In this method, it is possible to apply or add the same security element in at least two different constituent parts of the security document. At least one of said security elements is preferably applied through a coating process, possibly a first time to the substrate itself or to a constituent of said substrate, and said constituent of said substrate can in this document, be chosen from the group of wires , windows, fibers, paper planchette, sheets and decals, and a second time through the printing on said substrate able to be printed by the security printer. All coating or printing methods can also be used to apply said security elements, significant engravings, offset, letterpress, screens, flexography, gravure, or inkjet printing, etc., as well as, roller coatings, division, atomization or powder, etc. The method described has the effect of linking the step of making the substrate or paper, more directly in the security chain, creating a custom design link between the security substrate or a constituent of the security substrate, and at least one element of security. security printed on said security substrate by a security printer. Furthermore, the use of a first and at least one additional security element is described, which has substantially the same properties within or in at least two different constituent parts of a security document. It is also possible to use the same security element in two or more different constituent parts of the security document.

BRIEF DESCRIPTION OF THE FIGURES The invention is now further illustrated with the aid of the drawings and exemplary embodiments. Figure 1 illustrates the customized design of the security chain by applying the same security element to two or more different constituent parts of a security document. Figure 2 schematically represents a passport page of a presented example. Figure 3 schematically represents a Diploma Certificate of a further example. Figure 4 schematically represents a bill with communication security features. Figure 5 schematically represents another possible mode of a bill.

Detailed Description of the Invention In Figure 1, the customized design of the security chain is schematically illustrated. A security element S is applied or added to two or more different constituent parts 1, 2, 3 of a security document. It is not compulsory that the security element S be in the same or in the different constituent parts 1, 2, 3, but that the properties of the security elements S have to be substantially the same. In Figure 2, a possible embodiment of the invention is presented. The second page of a passport usually serves for authentication purposes and contains a combination of security features, produced by different processes, such as offset, etching and screen printing, using a pre-manufactured security substrate. In the present example, the printing substrate is a security paper which is already coated by the paper manufacturer, in accordance with the description of EP 490 825 Bl, with a customer-specific strip comprising coated interference particles ( for example, iridescent pigments), such as can be obtained from Merck (Iriodin® Colorcrypt®), or from Engelhard (Mearlin®). Said interference pigment is practically invisible under normal view, but shows discrete colors dependent on the angle of vision at certain viewing angles. The pigments of different base colors are available, and in addition you can make specific colors of the client through the combination of the available pigments. With reference to Figure 2, a paper substrate P, pre-coated in the paper mill with a strip as a constituent part 1, comprising an optically variable or iridescent O pigment specific to the customer, having a certain color under certain conditions of vision, it was printed with a motif printed on screen as another constituent part 2; the ink of the screen again containing the same pigment 0. The pattern printed on the screen is thereby arranged adjacent to the pre-coated strip already present on the paper. The authentication of the document, effected by a simple vision and inclination, relies on the fact that no visible differences appear between the pre-coated strip and the printed screen ink pattern under all viewing conditions, the properties of the security elements are substantially the same. This is an indication that paper and screen ink, although they are manufactured and applied in different places, respectively, belong to the same customized design security chain, which serves as an additional security feature to the document. Another example is presented in Figure 3. Holographic lamella pigments have been described in US 5,415,950 (JG ing et al., Based on holographic volume), US 6,068,691 (RG Miekka et al., Based on the surface area of holography), as well as in additional documents. Such pigments can be manufactured by customer specifications in small to large quantities, and allow the formulation of coating compositions that provide wavelength-dependent and angle-dependent light reflection properties. The document of the present example, with reference to Figure 3, is produced by the following sequence of steps, which can be carried out independently of each other and in different places: Stage 1: Printing - printing of a background B multicolored by offset , on a cotton-based security paper P; - screen printing of a pattern, as a constituent part 2 on the background B printed by offset, using a solvent-based screen ink, comprising a customer-specific holographic pigment H, as described in US 6,068,691; - finishing operations, such as varnishing, cutting, etc., Stage 2: Personalization - filling in the corresponding personal data D; optionally protecting them with a transparent over-laminate (not shown).

Step 3: Validation - application of a hot stamped stamp (decalcomania) as another constituent part 1, which again comprises said holographic pigment H specific to the client.

The hot stamped seal (decal) is manufactured in specialized networks, using a printing technology of choice (UV or solvent based inks), as described in US 6,174,634; US 6,143,407; US 5,681,644; US 4,322,467; US 4,299,644; US 3,487,725 and still other documents. It comprises the following layers (from top to bottom): - polyester carrier sheet approximately 100 μm thick, coated release; - a sheet of polyester, approximately 10 μ thick, as the upper protective layer of the decal: - a customer-specific design layer, comprising said customer-specific holographic pigment H, approximately 10 μm thick, applied by engraving printing; - a thermo-adhesive layer.

The authenticity of the document finally obtained, requires that the parts printed on the screen and the stamp (decalcomania), exhibit the same color, with respect to the angle of vision as the security elements that in this document, have substantially the same properties. A preferred embodiment for a banknote is illustrated in Figure 4. Multilayer thin film interference pigments for banknotes and other security applications have been described in US Pat. No. 5,084,351 (R. W. Philps) and in related documents. The bill of the present example, with reference to Figure 4, comprises a laminated window security thread, as a constituent part 1, and a denomination printed on the screen as another constituent part 2, both comprise green-to-blue optically variable ink (OVI®, SICPA). The laminated security thread is manufactured in specialized networks, in accordance with documents US 5,324,079; US 5,509,691; preferably, EP 1 348 576 A2 or similar technology. The polymer layers of said interleaving sheet typically have a thickness of the order of 10 μm or less, and the coating layer has a thickness of the order of 10 μm; the total thickness of the intercalation of the complete polymer is of the order of 30 μ,; and the thickness of the paper money, in which said polymer interleaving sheet can be incorporated in the form of a yarn, is of the order of 100 μm. One side of a 10 μ polyester sheet was printed with a layer of a UV cure etch ink containing 20% optically variable green to blue pigment (supplied by FLEX Products Inc., Santa Rosa, CA), in the form of a specific client's motive. A second similar sheet was homogeneously coated on one side with a layer of UV curable etching ink containing 5% of the luminescent pigment that emits IR YV04: Nd as a non-obvious security element. After joining the print, respectively the coated sides of both sheets, the coating was hardened through exposure to the sheet under UV light. The sheet thus laminated was subsequently converted into security threads, supplied to the paper manufacturer for incorporation as a window thread in paper currency. The substrate P of the bill thus obtained was printed on a safety printer network with a B-antecedent by two-sided multi-color offset; - a design I of engraving by two sides; - a denomination on the one hand, closed by the security thread, applied by the screen printing, an optically variable ink comprising 20% of the optically variable green to blue pigment (supplied by FLEX Products Inc., Santa Rosa, CA ).

The authenticity of the ticket requires that the denomination printed by the screen and the window security thread, exhibit the same color with respect to the viewing angle, as the security element contained in this document, has substantially the same properties. The security thread additionally contains a UV-excited IR luminescent, for machine authentication. Another possible method for a banknote is shown in Figure 5, a circularly polarizing optically variable pigment in a liquid crystal polymer base, as well as coating compositions containing such, have been described in US 5,362,315 (CH Müller-Rees et al.,) US 5,683,622 (O. Kratschmar et al.), US 5,824,733 (J. Dobert et al.) And in related documents. Such pigments and coatings are useful as security elements, can be authenticated through their color, color changes and polarization properties (see, US 6,570,648 and related documents). The micro-etched transparent marking pigment lamellae have been described by A. Argoitia et al., In WO 03/11980 Al, US 2003/0031870 Al and in related documents. Said lamellae bear marks that have the size of a few micrometers, which can be elaborated according to the specifications of the client. The lamellae that bear marks, can be seen and identified in a coating with the help of an optical illumination microscope in axis, or a scanning electron microscope. The corresponding pigments are supplied by FLEX Products Inc. , Santa Rosa, CA. A polymeric substrate for bill printing has been described in WO 98/13211 Al (B. A. Hardwick et al.) And in related documents. It consists of a base substrate similar to a sheet of transparent plastic materials, of the order of 100 μm in thickness. Said plastic sheet is preferably an optically biaxially oriented polymer, which does not alter the optical polarization of the fundamental safety features. Said base substrate, which may be a single layer or a laminated sheet, is coated on the side with an opacifying layer, which may be included by an ink and applied by engraving printing. A corona pre-treatment of the plastic material can be applied and the adhesion promoters can be added to the ink, as shown in the art. The selective windows or middle windows can be left open in said coating process, and the window areas can be elaborated to carry certain security elements. Polymeric paper substrates are available, for example, under the trade names Guardian®, Sentinel®, Garrison®, etc., from Securency Pty Ltd., Australia. In the present example, with reference to Figure 5, a banknote comprises a polymeric substrate P having a transparent security window W, which bears an optically variable security feature printed as a constituent part 1, and furthermore has naming marks optically variable as another constituent part 2, printed with the same type of optically variable ink on the opacified part of the substrate. The polymeric substrate of the banknote is produced as follows: a sheet of polypropylene, biaxially oriented 100μ thick, transparent, treated by corona, (which can be obtained from UCB), serves as the same substrate, a specific motif of the client is printed on an area on one side of said base substrate, using solvent-based etching ink containing 15% polarizing liquid crystal pigment left Red to Green (obtained from WACKER Chemie; US 5,362,315), together with 5% pigment from micro-etched transparent lamellae, bearing a repeated "F" sign of 7 μm in height (obtained from FLEX Products Inc.). A solvent-based opacifying white etch coating was then applied in two steps to each of both sides of the base substrate, leaving open a circular window area around the printed optically variable feature. The substrate P of the bill was subsequently printed on the security printer network with a B-background by a multicolored recto-verso offset; provided a black surface N at the location of the last applied naming reason; - a design I of recto-inverse engraving; - a straight naming motif, applied on the black surface N already provided by screen printing with an optically variable ink containing 15% polarizing liquid crystal pigment left Red to green (obtained from Wacker Chemie; US 5,362,315), together with 5% of microplated transparent lamella pigment bearing a 7"high repeated" F "sign (obtained from FLEX Products Inc.). The optically variable pigment obtained in the security window is transparent under ordinary circumstances; for authentication, the window is placed on a black surface, where the authentication of the bill requires the naming motif printed on the screen and the optically variable window to exhibit the same color with respect to the viewing angle. Again this is due to the security elements contained herein, which have substantially the same properties. The micro-engraved transparent marking pigment is invisible to the unassisted human eye, but it can be authenticated in both the security window and in the naming motif, with the help of a lighting microscope on axis (at 500x magnification) .

Claims (14)

NOVELTY OF THE INVENTION Having described the present is considered as a novelty, and therefore, the content of the following is claimed as property: CLAIMS

1. Security document comprising a substrate (P) as a first constituent part and at least one other constituent part and a first security element (S) being applied to or comprised in one of the constituent parts, said security element (S) having properties identifiable, the presence of said properties serves as a first authentication feature for said security document, characterized in that, at least one additional security element (S) having substantially the same identifiable properties is applied to, or comprised in at least one other of the constituent parts, as a safety feature, said safety elements (S) are chosen from the group consisting of optically variable pigments, multilayer thin film interference pigments, glass-liquid pigments, holographic pigments, Coated interference, thermochromic pigments, photochromic pigments, luminescent compounds, infrared absorbing compounds, UV absorbing compounds, magnetic compounds, micro-textured or micro-textured lamella pigments, forensic marking compounds, and said safety elements (S) are applied or added to the constituent parts, in a way to allow a comparison of its properties as a third security feature. Security document according to claim 1, characterized in that the first and second additional security elements are materially the same. Security document according to claim 1 or 2, characterized in that the security document is a banknote, a paper with value, an identification document, an access card, a security label or packaging. 4. Security document according to one of claims 1-3, characterized in that the substrate (P) is selected from the group consisting of paper, cardboard, textiles, sheets, printing layers and polymer sheets. Security document according to one of the claims 1-4, characterized in that the other constituent parts are chosen from the group consisting of printing inks, security threads, windows, fibers, planchette paper, sheets and stickers. Security document according to one of claims 1-5, characterized in that at least one of said security elements (S) is contained in an ink or coating. Security document according to one of the claims 1-6, characterized in that at least one of said security elements (S) is contained in or applied to the substrate (P) or one of the constituents thereof. Security document according to one of claims 1-7, characterized in that said substrate (P) comprises a structure of alternating polymers and coating layers. 9. Security document according to one of claims 1-8, characterized in that said security elements are chosen from the group comprising non-obvious security elements. 10. A method for producing a security document comprising a substrate (P) as a first constituent part and at least one other constituent part, by applying or adding a first security element (S) to one of the constituent parts, said security element (S) has identifiable properties, the presence of said properties serves as a first authentication feature for said security document, applying or adding at least one additional security element (S) having substantially the same properties to another of the constituent parts as a second safety feature, characterized by, the first and second additional safety elements (S)are selected from the group comprising optically variable pigments, multi-layer thin film interference pigments, glass-liquid pigments, holographic pigments, coated interference particles, thermochromic pigments, photochromic pigments, luminescent compounds, infrared absorbing compounds, UV-absorbing compounds, magnetic compounds, micro-etched or micro-textured lamella pigments, forensic marking compounds, and said security elements (S) are applied or added to the constituent parts, in a manner to allow comparison of their properties as a third security feature. Method according to claim 10, characterized in that the same security element (S) is applied or added to two or more different constituent parts (P) of the security document. Method according to claim 10 or 11, characterized in that at least one of said security elements (S) is applied to a constituent part by a printing or coating process. 13. The use of a first and at least one additional security element (S) having substantially the same properties within or in at least two different constituent parts of a security document. 14. The use of a first and at least one additional security element (S) according to claim 13, characterized in that the first and the additional security elements are substantially the same.