EP3175037A1 - Sicherheitselement, wertdokument-substrat, wertdokument und verfahren zur herstellung desselben und transferband - Google Patents
Sicherheitselement, wertdokument-substrat, wertdokument und verfahren zur herstellung desselben und transferbandInfo
- Publication number
- EP3175037A1 EP3175037A1 EP15757436.9A EP15757436A EP3175037A1 EP 3175037 A1 EP3175037 A1 EP 3175037A1 EP 15757436 A EP15757436 A EP 15757436A EP 3175037 A1 EP3175037 A1 EP 3175037A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- feature
- feature substance
- substance
- layer
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
Definitions
- the invention relates to a security element for bonding to a substrate, such as a security paper, a value document or another valuable item.
- the invention further relates to a value document substrate for producing value documents, in particular banknotes, a value document, a method for producing the value document and a transfer belt.
- the invention relates to the use of chemically unstable inorganic security features in adhesive layers.
- the adhesive layer protects the security feature from harmful environmental influences, such as moisture, solvents, acids or bases, and thereby allows the use of the feature particles without an additional complicated treatment of the particles, e.g. by coating the feature particles with a protective silica shell.
- EP 1 042 130 Bl describes how a polymer banknote is produced from a plurality of biaxially oriented polypropylene (BOPP) films, which are joined together by means of heat-activatable intermediate or adhesive layers. Subsequently, the polymer banknote is coated with opaque pressure-receiving layers, printed, and provided with transparent, silica-containing protective layers. Furthermore, the introduction of magnetic feature substances into the polymer film via a thermal fusion process is described.
- BOPP biaxially oriented polypropylene
- EP 2 388 551 A2 describes in this context the combined preparation of the BOPP films with the "skin" adhesive layers by triple coextrusion.
- EP 1 545 902 Bl describes the production of the so-called hybrid banknote, which is based on a film / paper / film composite substrate.
- a paper core on both sides with two thin, about 6 to 10 ⁇ thick films and an intervening, three-dimensionally crosslinking adhesive layer is connected.
- Feature substances having visually and / or mechanically detectable physical properties e.g. Luminescent substances, either introduced into the paper volume or applied to the paper core, on the inside or on the outside of the film by means of printing.
- the adhesive layer can be equipped with feature substances.
- the adhesives used for this purpose are water-crosslinking (for example via atmospheric moisture) or UV-crosslinking adhesives. Particular preference is given to using a wet adhesive, in particular a polyurethane adhesive.
- a wet adhesive in particular a polyurethane adhesive.
- organic photochromic substances such as Bacteriorhodopsin are described, which are introduced for stabilization in a lacquer layer between two polymer films of eg polyester, polyethylene terephthalate, polypropylene, polyethylene, polyamide or polycarbonate.
- organic feature substances offer only a limited UV stability, have a number of other disadvantages compared to inorganic substances and do not develop those with inorganic substances achievable effects.
- the use or protection of chemically unstable inorganic feature substances is not described.
- German patent document DE 3843077 A1 plastic safety threads are described in which a carrier foil is provided with a metallic or magnetic coating and subsequently is laminated or bonded with a further foil. In this case, however, no complete inclusion of the coatings and thus only limited protection against environmental influences is achieved.
- WO 2007/068886 A1 describes a security label which contains a rare-earth-ion-doped carrier and its encapsulation in a UV-absorbing barrier material (with an absorption coefficient> 0.6 for wavelengths of 300 to 400 nm), around the luminescent To shield rare earth ions against broadband excitation in the UV.
- a microencapsulation of the inorganic feature substances with polymers, such as polyimide is used for this purpose.
- the choice of rare earth luminescent substances is not limited, also play protective functions against extraction test of the feature substance irrelevant.
- WO 00/39397 A1 describes a feature system which consists of a combination of two feature substances having a different temperature stability.
- the combination of an organic and an inorganic phosphor is mentioned.
- this phosphor combination only provides limited UV stability.
- the direct introduction of inorganic, less stable feature substances such as silver or copper / cerium-doped zinc sulfide is proposed in the pulp.
- these substances are typically only destroyed at temperatures of approx. 700 ° C, which does not offer reliable protection against ashing.
- wet-chemical attacks to extract the feature substance can not be prevented with this approach.
- EP 1 863 651 B1 describes a feature system with two luminescent substances, wherein a radiative energy transmission by emission and reabsorption links the two features.
- the first feature substance is embedded in the paper or polymer and is destroyed at high temperatures, in particular when the value document is burned.
- the temperature-sensitive feature substance based on organic luminescent substances no alternatives are shown.
- organic luminescent substances only offer limited UV stability.
- wet-chemical attacks to extract the feature substance can not be prevented with this approach.
- the object of the invention is to provide a security element which is improved with respect to the security against forgery and a security document or security paper provided with such a security element.
- Another object is to provide a value document substrate improved with respect to tamper resistance. This object is achieved by the feature combinations defined in the main claims. Preferred embodiments are subject of the dependent claims.
- a film-like security element for bonding to a substrate such as a security paper, a value document or another valuable item
- the security element has at least one bonding surface, which is coated with at least one adhesive layer, and the adhesive of at least an adhesive layer containing an inorganic chemically unstable feature substance and the adhesive is adapted to the unstable feature substance after three-dimensional crosslinking of the adhesive against harmful environmental influences, especially against moisture and / or oxygen and / or solvents and / or acids and / or bases and / or Oxi stabilizing agent and / or reducing agent
- the inorganic chemically unstable feature substance is a luminescent substance, a SERS active substance or an NIR absorber.
- a security element according to claim 1 or 2 wherein the inorganic chemically unstable feature substance is unstable to aqueous solutions of acids and / or bases and the instability is defined by aqueous solutions of acids and bases according to the following tests (a) and (b):
- Test (a) relating to a feature substance that is unstable to aqueous solutions of acids: a paper substrate containing the feature substance or coated with the feature substance is immersed for 40 minutes at room temperature in a 0.5 molar hydrochloric acid solution, wherein at least 90%, preferably at least 99% of the feature signal or the feature intensity must be lost;
- Test (b) relating to a non-aqueous solution of bases-unstable feature substance: a paper substrate containing the feature substance or coated with the feature substance is immersed in a 0.5-molar NaOH solution for 40 minutes at room temperature at least 90%, preferably at least 99% of the feature signal or the feature intensity must be lost.
- a security element according to any one of claims 1 to 3, wherein the inorganic chemically unstable feature substance is a luminescent substance which is unstable to moisture and the instability to moisture is defined by that upon contact of the substance with demineralized water during a period of 1 hour at room temperature, a signal loss of the original Lumineszenzemission by more than 40%, preferably more than 80% occurs.
- a security element according to claim 5, wherein the chemically unstable feature substance is an inorganic luminescent substance and in particular based on a host lattice doped with rare earth ions or with transition metal ions.
- a security element according to any one of claims 1 to 7, wherein the grain size D90, in particular D99 of the chemically unstable feature substance forming feature substance particles is smaller than the thickness of the at least one adhesive layer.
- a security element according to one of claims 1 to 9, wherein the security element, either completely or partially, a diffractive or a refractive structure, in particular a hologram, an effect layer based on interference pigments or liquid crystal pigments, a layer sequence with color shift effect, eg a reflector / dielectric / absorber layer structure, or a micro-optical representation arrangement, preferably a moire or a modulo magnification arrangement, in particular with micro focusing elements and micromotif elements.
- value-document substrate for the production of value documents, in particular banknotes, comprising at least one Carrier layer and a first cover layer, wherein the first cover layer is a film layer and the carrier layer comprises a paper layer or a film layer and the carrier layer is connected to the first cover layer by at least one adhesive layer and the adhesive of the at least one adhesive layer, a chemically unstable inorganic feature substance contains and this stabilized by the three-dimensional cross-linking of the adhesive against harmful environmental influences, especially against moisture and / or oxygen and / or solvents and / or acids and / or bases and / or oxidants and / or reducing agents.
- value-document substrate according to claim 11 which in addition to the at least one carrier layer and the first cover layer comprises a second cover layer, wherein the second cover layer is a film layer and the support layer with the first cover layer and with the second cover layer each connected by at least one adhesive layer and the adhesive of the at least one adhesive layer contains a chemically unstable inorganic feature substance and this by the three-dimensional crosslinking of the adhesive against harmful environmental influences, especially against moisture and / or oxygen and / or solvents and / or acids and / or bases and / or oxidants and / or reducing agents stabilized.
- Test (a) relating to a feature substance that is unstable to aqueous solutions of acids: a paper substrate containing the feature substance or coated with the feature substance is immersed for 40 minutes at room temperature in a 0.5 molar hydrochloric acid solution, wherein at least 90%, preferably at least 99% of the feature signal or the feature intensity must be lost;
- Test (b) relating to a feature substance unstable to aqueous solutions of bases: a paper substrate containing the feature substance or coated with the feature substance is immersed in a 0.5 molar NaOH solution at room temperature for 40 minutes at least 90%, preferably at least 99% of the feature signal or the feature intensity must be lost.
- the inorganic chemically unstable feature substance is a luminescent substance which is unstable to moisture and the instability to moisture is defined by that upon contact of the substance with demineralized water during a period of 1 hour at room temperature, a signal loss of the original luminescence emission by more than 40%, preferably more than 80% occurs.
- value-document substrate according to any one of arrival claims 11 to 16, wherein the chemically unstable feature substance is an inorganic luminescent substance and in particular based on a rare earth ion or with transition metal ions doped host lattice.
- Feature substance-forming feature substance particles is smaller than the thickness of the at least one adhesive layer.
- value-document substrate according to any one of arrival claims 11 to 18, wherein the at least one adhesive layer has two subregions, each containing a first unstable feature substance or a second unstable feature substance, wherein the first feature substance and the second Distinguish feature substance with respect to their excitation wavelengths and / or their emission wavelengths and form the two subregions of the adhesive layer in this way an encoding.
- a value document in particular a banknote, comprising a value-document substrate according to one of claims 10 to 20.
- a transfer belt comprising a plurality of security elements formed on a substrate, such as a security paper, a value document or another valuable article, for transferring security elements according to any one of claims 1 to 9.
- a substrate such as a security paper, a value document or another valuable article
- Value documents within the scope of the invention are items such as banknotes, checks, stocks, tokens, identity cards, passports, credit cards, documents and other documents, labels, seals, and items to be protected, such as jewelery, cosmetics, CDs, packaging, bottles, flasks and similar.
- the value document substrate does not necessarily have to be a paper substrate, it could in particular be a plastic substrate or a substrate that has both paper components and plastic components.
- a substance as a banknote security feature requires some degree of chemical stability against certain environmental influences, e.g. to moisture, acids, bases and / or organic solvents. If a substance does not fulfill the required requirements, it is normally not used.
- the fabric is either replaced by an equivalent stable substance or the fabric is modified to increase its chemical stability by a particular method, e.g. by coating with a protective layer (see, for example, DE 10 2004 063 217 A1 and DE 10 2009 056 634 A1).
- the in The materials used in the present invention are not applied as usual in the paper substrate of the banknote or in printing inks applied to the banknote surface, since in this case adequate protection from harmful environmental influences is not ensured.
- these unstable materials in layers of adhesive that bond two layers of a document of value, with the layers independently selected from polymer or paper.
- the two layers can each form a substrate layer of the value document.
- one layer forms the substrate layer of the value document substrate and the second layer is the film of a film security element applied to the value document substrate.
- plastic or film are used in the present description.
- polymer layer or polymer layer
- plastic layer or plastic layer
- film layer or film layer
- a protective effect against environmental influences can also be achieved by embedding the chemically unstable substance in a polymer substrate, for example the polymer substrate of a polymer banknote.
- Polymer substrates are generally based on uncrosslinked thermoplastic polymers into which the feature substances are introduced, for example, by melting or dissolving the polymer, by mixing with the feature substance and renewed hardening or precipitation of the polymer now containing the feature substance.
- these processes are easily reversed so that the feature substances are separated under relatively mild conditions by remelting or dissolving the polymer and are available to the counterfeiter for analysis or use in counterfeiting.
- Thermoplastic systems such as polymer bank note substrates or so-called Hot-melt adhesives that are already fully polymerized and do not form a linked network of chains are therefore less suitable and not preferred.
- adhesives are used which still have to polymerize completely, in which case at least in part a linking of the individual polymer chains can take place.
- the individual polymer chains are three-dimensionally crosslinked with each other, whereby it is no longer possible to melt or dissolve the adhesive layer without destroying the binding sites.
- Suitable adhesive systems include, for example, typical heat, water or UV crosslinking adhesives, e.g. polyurethane-based, acrylate-based or epoxy-based. Unsuitable are non-crosslinking thermoplastic systems and solvent-based wet adhesives.
- water-crosslinking adhesives are only suitable for water-resistant feature substances.
- the feature substance previously introduced into the liquid adhesive is thus enveloped by the adhesive in a manner such that removal of the feature substance without prior chemical destruction of the polymer chains of the adhesive is rendered impossible.
- the conditions for such disruption of the linked polymer network are very aggressive and include, for example, the burning of the banknote or the breaking of certain bonds by chemicals, e.g. the saponification of urethane groups in polyurethanes under strongly basic conditions, or the oxidative degradation of organic material by Fentons reagent.
- the adhesive system according to the invention efficiently prevents, in the event of attack of destabilizing liquids, for example, petroleum ether or an aromatic hydrocarbon-based solvent, the formation of a source front with penetrating destabilization. render liquid. This reliably prevents soluble feature substances from being destroyed by the attacking liquid or from being extracted by such liquids (see FIGS. 1 and 2).
- destabilizing liquids for example, petroleum ether or an aromatic hydrocarbon-based solvent
- FIG. 1 shows a composite banknote (1) with a foil (2) / paper (3) / foil (2) layer structure with a forming source front during an attack of a destabilizing liquid on a non-swelling adhesive (4).
- FIG. 2 shows an example of a hybrid banknote (5) (ie a foil (2) / paper (3) / foil (2) composite banknote) in which an attack of a destabilizing liquid on an adhesive that protects against swelling occurs (4) does not form a source front.
- a hybrid banknote (5) ie a foil (2) / paper (3) / foil (2) composite banknote
- the instability of the feature substance may also serve as a so-called "fitness indicator" to provide information about the condition of the patient circulating value document, eg a banknote.
- a value document may be provided with micro-cracks at the location of the feature substance in order to allow the penetration of moisture into the adhesive layer, so that the feature substance is partially decomposed in this way.
- the inorganic feature substances are preferably present in particulate form.
- incorporation of inorganic feature substance particles into adhesives is significantly easier compared to incorporation of feature substance particles into banknote substrates of polymeric material.
- the introduction of the feature substance particles can be effected by stirring into a liquid component of a two-component adhesive with the aid of a dissolver disk.
- the technical complexity compared to a coating of the feature substance particles is significantly lower.
- the introduction into adhesive layers is therefore particularly advantageous for chemically unstable feature substances.
- the chemically unstable inorganic feature substances may be e.g. based on photoluminescent or electroluminescent substances, magnetic substances, surface-enhanced-Raman (SERS) -active particles or on NIR absorbers.
- SERS surface-enhanced-Raman
- inorganic luminescent substances in particular those based on rare earth ions or host metal lattices doped with transition metal ions.
- luminescent chemically unstable feature substances are used in a non-visible wavelength range, preferably in the IR.
- the term "chemically unstable” means that the feature substance outside the protective adhesive matrix, ie as a conventional security feature present within the paper or as a security feature which is present in the form of a printed layer applied to the paper, is not banknote suitable. that a check of the characteristic properties in a bill containing the unprotected feature substance does not fulfill the usual stability criteria of banknote tests, eg stability to moisture, acids, bases, solvents, oxygen or detergent.
- the feature substance is unstable to aqueous solutions of acids and / or bases.
- a feature substance that is unstable to aqueous solutions of acids can be defined according to the following test:
- a paper substrate containing the feature substance or coated with the feature substance is immersed in a 0.5 molar hydrochloric acid solution for 40 minutes, whereby at least 90%, preferably at least 99% of the feature signal (or feature intensity) must be lost.
- the feature substance loses over 90%, more preferably over 99%, of its
- a feature substance which is unstable to aqueous solutions of bases may be defined according to the following test:
- a paper substrate containing the feature substance or coated with the feature substance is immersed for 40 minutes in a 0.5 molar NaOH solution, wherein at least 90%, preferably at least 99%, of the characteristic signal (or the feature intensity) must be lost.
- the feature substance loses over 90%, more preferably over 99%, of its feature intensity upon contact of the paper substrate for 40 minutes with a solution having a pH> 13, preferably with a pH> 12, especially preferably with a pH> 10.
- the feature substance be water-soluble.
- the water solubility (at 20 ° C) is preferably more than 2 mg per liter of water, more preferably more than 200 mg per liter of water, and most preferably more than 20,000 mg per liter of water. With such solubilities, for example, it is no longer possible to meaningfully add luminescent feature substances during papermaking. These substances are usually added in the range of a few Scientificsspromille relative to the pulp and would thus completely or largely dissolve in the water of the paper machine.
- the corresponding feature signal is irreversibly changed or destroyed by the contact with the respective medium. In certain cases, this can also take place without dissolution of the feature substance, for example by conversion of the crystal phase of the feature substance, by addition of water of crystallization, by exchange of anions or by oxidation or reduction of the dopant.
- the host lattice preferably consists of combinations of inorganic cations and anions.
- Carbonates CO3 2 ", bicarbonates HCO3", cyanides CN-, cyanates OCN “, thiocyanates SCN- and carbides are the only carbon-containing compounds, as generally customary, also as inorganic compounds, while the remaining carbon-containing compounds, such as formates HCO2 " or oxalates C2O4 2 " etc., as generally customary, are counted among the organic compounds.
- Suitable host lattices are in particular compounds which contain exclusively alkali metals and / or alkaline earth metals as cations, since these have only weak interactions with the crystal lattice because of their low charge and are therefore easily dissolved out. Also suitable are compounds containing ammonium cations. Examples of this first class of compounds for forming the feature substance are sodium molybdate Na 2 Mo0 4 , sodium stannate Na 2 SnO 3 and strontium carbonate SrC0 3 .
- niobates of the alkali and alkaline earth metals are extremely stable and therefore not suitable for the purposes of the invention.
- suitable anions which generally form readily soluble or chemically unstable compounds, are the anions or anionic oxide compounds of the fifth to seventh series of the periodic system, ie the nitrogen group, chalcogenides and halides, in particular the nitrates, phosphates, and sulfates .
- halides are Preferably chlorides, bromides and iodides are used, since pure fluoride salts often have particularly high stabilities and are therefore less preferred.
- suitable unstable fluoride compounds are often available by combination with other, larger anions.
- carbonates iobates
- CO3 2 - suitable CO3 2 - suitable.
- different oxidation states eg nitrate NO 3 / nitrite NO 2
- other more complex modifications eg sulfate SO 4 2 - / thiosulfate S2O3 2 - / disulfate S2O7 2 -.
- Mixed forms with oxides can often be formed (oxide sulfates, oxide bromides, etc.) or protonated forms (eg carbonate / bicarbonate), which are also unstable
- Certain compounds are also soluble or unstable as a complete oxide, eg boric oxide B2O3.
- Examples of the second class of compounds for forming the feature substance are manganese (II) carbonate MnC03, lanthanum sulfate La2 (S0 4 ) 3, silver phosphate Ag3P0 4 and tri-yttrium oxide heptachloride Y3OCl7.
- rare earth phosphates are generally extremely stable and therefore not suitable for the purposes of the invention.
- the compounds for forming the feature substance are particularly preferably combinations of the cations of alkali metals and / or alkaline earth metals and anions which are selected from the group consisting of nitrate, nitrite, phosphate, phosphite, arsenate, sulfate, sulfite, sulfide, chloride, Bromide, oxide, hydroxide and carbonate are selected.
- nitrate, nitrite, phosphate, phosphite, arsenate, sulfate, sulfite, sulfide, chloride, Bromide, oxide, hydroxide and carbonate are selected.
- mixed forms with a plurality of different of the abovementioned cations and / or anions can also be formed.
- Examples of this third, particularly preferred class of compounds for forming the feature substance are lithium chloride LiCl, sodium carbonate Na 2 CO 3, potassium sulfate K2SO4, magnesium phosphate fluoride Mg 2 P04F and calcium arsenate hydroxide Cas (As04) 30H.
- the dopants are selected from the group consisting of rare earth metals and transition metals. While rare earth cations generally retain the +3 oxidation state relatively stably (eg, Nd 3+ , but with known exceptions, eg, Eu 2+ / 3+ , Ce 3+ / 4+ , etc.), transition metals can easily change and react their oxidation states Therefore, they are particularly sensitive to environmental influences, since they are only stable within certain pH values when in contact with aqueous solutions and otherwise decompose (eg, Fe 6+ is relatively stable only in strongly basic solutions).
- rare earth cations generally retain the +3 oxidation state relatively stably (eg, Nd 3+ , but with known exceptions, eg, Eu 2+ / 3+ , Ce 3+ / 4+ , etc.)
- transition metals can easily change and react their oxidation states Therefore, they are particularly sensitive to environmental influences, since they are only stable within certain pH values when in contact with aqueous solutions and otherwise decompose
- Suitable host lattices with luminescent centers ie dopants based on transition metals therefore react particularly sensitively to environmental influences such as moisture, acids or bases and oxidizing or reducing agents.
- the dopant is therefore preferably a transition metal cation, in particular a transition metal cation that is luminescent in the NIR range.
- the luminescence of the feature substance is not simply reduced or extinguished by environmental influences, but a change in the matrix or the dopant causes a spectral change in the luminescence signal which can be detected.
- the luminescence signal can change its spectral shape, for example be broadened or change the ratio of individual luminescence bands to one another; or
- the luminescence signal can change its spectral position, for example by changing the wavelengths of individual bands, or by replacing a luminescence signal with a new luminescence signal in another wavelength range; or
- the luminescent signal may become more optical with respect to other Properties change, for example, in his cooldown or his excitation spectrum.
- a "first" unstable feature substance which is based on a host lattice doped with europium (II) cations and luminesces in the green spectral region, can, after contact with environmental influences such as acids, be converted into a second feature substance which, owing to its altered structure, europium (US Pat. III) cations and luminesces in the red spectral region.
- unstable feature substances could be partially stabilized, i. they are e.g. Although increased in their stability by a faulty, thin or permeable surface coating, however, they are still insufficiently stable for use outside a protective adhesive layer.
- suitable instable feature substances can also be obtained by providing feature substances with a suitable mixing, agglomeration or coating with destabilizing reagents.
- destabilizing reagents for example, such an acid-labile but actually stable to water luminescent substance such as Ca3Mg3 (PO4) 4: Eu2 + by a coating with eg tartaric acid are also made water sensitive.
- the (not yet stabilized) feature substance can be introduced directly into an adhesive which, for example, connects two layers of the value document substrate.
- an adhesive containing the feature substance can be applied in a separate application process (eg by hot embossing, thermal transfer, laser printing) or doctor blade method) on a separate film, in particular on a film-based security element, are applied, wherein the film is later connected by means of the applied adhesive layer with the value document such as a banknote.
- Film-based security elements are also referred to below as foil-type security elements or film security elements. They may be in the form of a label, a patch or a strip, for example.
- the unstable feature particles contained in the adhesive are protected from environmental influences by the cross-linked adhesive layer that envelops them.
- An additional protective effect is provided by the unilaterally or bilaterally applied polymer and / or paper layers bonded by the adhesive (for example by the individual polymer layers forming the value document substrate and connected by means of an adhesive layer; alternatively, a (in particular central) paper layer of a
- Wertdocumentsubstrats on its front and / or back (each) be connected to a polymer layer by means of an adhesive layer; Furthermore, a film-based security element can be applied by means of an adhesive layer on an outer polymer layer of a value document substrate.
- the adhesive loaded with one or more feature substances can be applied over the entire value document or the entire banknote over the entire surface in order to bond the substrate layers forming the value document substrate over the entire area.
- a value document substrate based on a film / paper / film composite with adhesive layers at the interfaces between the central paper layer and the two outer films, it is advantageous to use further adhesion or moisture barrier layers with or without Provide feature loading between the paper core and the feature-loaded adhesive layer.
- film security elements are attached to a value document substrate by means of an adhesive layer, e.g. to create a see-through window above a paper note provided with an opening.
- an adhesive layer e.g. to create a see-through window above a paper note provided with an opening.
- the additional protective effect of the outer, the window forming polymer layers is given.
- the closing of an opening in the value document substrate with film security elements allows several variants with regard to the nature of the opening and the film security elements used.
- an opening can be sealed from both the front side and the back side with a film security element each, wherein each film security element has an adhesive layer and the opening as such is substantially unfilled, i. essentially filled with air.
- the adhesive may also be present in the opening itself, i. the opening is filled completely or only partially by the adhesive.
- the opening is closed only by one of the two film security elements and the second film security element has a congruent with the opening of the value document substrate opening.
- the embedding of the chemically unstable feature substance in (in particular at least partially metal) l array and / or provided with micro-optical elements) foil security elements conceivable by the feature substance having the adhesive either different layers within the layer structure of the security element glued together, or glued the foil security element as a whole with the value document substrate.
- the unstable feature substance introduced into an adhesive and thus stabilized need not necessarily be distributed homogeneously in the adhesive, but it can also be present in (intensity) modulated form along the adhesive layer.
- a modulation can in particular generate a coding.
- the modulation can e.g. be accomplished by a suitable adhesive pattern, i. the adhesive containing the feature substance is not in the form of a full-surface layer, but in the form of a pattern with partial regions (in particular a strip-shaped, linear, point-like pattern, a pattern in the form of characters or other geometric elements).
- a modulation can be accomplished by having a full-surface adhesive layer, but the unstable feature substance is present only in partial areas of the adhesive layer, to form a pattern in this way (in particular a strip-shaped, linear, punctiform pattern, a pattern shape in the form of Characters or other geometric elements).
- a modulation can also be accomplished by modulating the application thickness of the adhesive layer.
- the adhesive layer may contain first and second (and possibly also third, fourth and further) application areas, wherein the individual types of the application areas differ with respect to the application thickness of the adhesive containing the feature substance.
- a multi-component feature system ie, different feature substances
- separate introduction may occur depending on the stability.
- a combination of a stable feature substance and an unstable feature substance can be used, wherein the stable feature substance is applied in or on the (paper) substrate layer of a value document and the unstable feature substance is incorporated into the adhesive layer.
- both feature substances can be incorporated into the adhesive layer.
- Both the unstable feature substance and the stable feature substance can be present independently of one another in modulated form, in particular in the form of a pattern, and in particular form an encoding.
- the modulation can, as described above, be accomplished in particular by the adhesive pattern or by a modulated application thickness of the adhesive.
- the particle size of the feature substance particles is preferably smaller, in particular preferably significantly smaller than the dimensions (ie thickness) of the adhesive layer, so that the feature substance particles can be completely embedded in the adhesive layer and this can exert a particularly advantageous protective effect on the feature substance particles.
- a sufficient protective effect is achieved when 90% of the feature substance particles are smaller than the thickness of the adhesive layer.
- the particle size D90 of the feature substance particles is preferably smaller than the thickness of the adhesive layer, more preferably less than 75% of the thickness of the adhesive layer, particularly preferably less than 50% of the thickness of the adhesive layer.
- the particle size D99 of the feature substance particles is smaller than the thickness of the adhesive layer preferably less than 75% of the thickness of the adhesive layer, more preferably less than 50% of the thickness of the adhesive layer.
- the particle sizes D90 and D99 of the particles are determined using a substance-specific suitable method, such as a laser scattered light spectrometer based on the static laser light scattering according to DIN / ISO 13320 or determined microscopically and describes the particle diameter for which 90% and 99% of all particles have a smaller volume.
- a suitable design of the toughness, surface tension and curing time of the adhesive it is also possible for characteristic substance particles larger than the average layer thickness of the adhesive to be reliably bound and sealed if a continuous adhesive layer of sufficient thickness is formed around the particles.
- Typical application rates for bonding adhesive layers between individual layers of a value document such as a banknote are in a range of 5 to 10 g / m 2 .
- typical layer thicknesses are therefore in the range of 4 to 8 ⁇ .
- FIG. 3 shows an example of a value document (6) according to the invention, in the example a polymer banknote.
- the banknote substrate is formed by two BOPP films (7), which are glued together with an adhesive layer (8) containing the feature substance.
- the outside of both BOPP films (7) can be equipped with a pressure-receiving layer (9).
- FIG. 4 shows a further example according to the invention of a value document (10), in the example a banknote.
- the banknote substrate is formed by a foil (II) / paper (12) / foil (II) composite, wherein the paper core (12) is provided with a film (13) containing the feature substance on its front side and on its back side (FIG. 11) is glued.
- the outside of both films (11) can additionally be equipped with a pressure-accepting layer (not shown in the figure).
- only one of the two adhesive layers may be loaded with the feature substance.
- the adhesive layer containing the feature substance need not be the only adhesive layer in the value document substrate.
- an adhesive layer which adheres two substrate layers (each based on polymer and / or paper) of the value document substrate, in the form of a three-layer adhesive layer structure, wherein the central adhesive layer contains the feature substance and the two outer, surrounding the central adhesive layer Adhesive layers have no feature substance.
- the surrounding adhesive layers may have the same composition as the central adhesive layer.
- the surrounding adhesive layers may each have a different composition with specifically optimized properties such as flexibility, substrate adhesion, etc. than the central adhesive layer.
- the security element (14) has a surface (16) intended for bonding to a security paper or document of value or another valuable object.
- the surface (16) has an adhesive layer (17) containing the unstable feature substance and not three-dimensionally (fully) crosslinked.
- the layer structure (15) of the security element may include, for example, a diffractive or a refractive structure, in particular a hologram, an effect layer based on interference pigments or liquid crystal pigments or a reflector / dielectric / absorber layer structure.
- the layer structure (15) may further comprise a micro-optical representation arrangement, preferably a moire or a modulo magnification arrangement with microfocusing elements and micromotif elements.
- the security element (14) shown in FIG. 5 can have an optional release film on the side of the adhesive layer (17) opposite the layer structure (15). The release film is detached from the adhesive layer (17) before the security element (14) is applied to a value document substrate.
- the security element shown in FIG. 5 can be used as a transfer element together with further transfer elements on a e.g. be arranged as an endless belt transfer ribbon.
- the adhesive layer (17) of the security element shown in FIG. 5 can additionally be equipped with special anti-blocking agents which prevent premature, unwanted sticking of the security element.
- the anti- Blocking agents can be deactivated with regard to their antiblocking properties by heat, radiation and / or by mechanical action (see, for example, the antiblocking agents described in EP 2 202 087 A2).
- FIG. 6 shows a schematic cross-sectional view of a security paper or value document provided with the security element of FIG. 5.
- the security paper substrate or document of value substrate (18) is based, for example, on paper, on a film or is part of a film / paper / film composite.
- Fig. 7 shows a schematic cross-sectional view of a security paper or document of value (19) with a substrate layer (20) (in the example a paper layer), which is provided with an opening (21).
- the opening (21) of the substrate (20) is closed from the upper side with a first film security element (22).
- the first film security element (22) is applied to the upper side of the substrate layer (20) by means of a crosslinked adhesive layer (23) containing a first unstable feature substance.
- the second film security element (24) is applied to the underside of the substrate layer (20) by means of a crosslinked adhesive layer (25) containing a second unstable feature substance.
- the film security elements (22, 24) shown in FIG. 7 may have the same dimensions as the substrate (20) with respect to their length and width.
- the film security elements (22, 24) may independently have smaller dimensions than the substrate (20) and may be in the form of a patch, label, strip, or thread, for example.
- the above-described embodiment shown in Fig. 7 may be varied so that only one of the two adhesive layers (23, 25) has an unstable feature substance and the other adhesive layer has either no feature substance or a conventional, stable feature substance.
- the substrate layer (20) in FIG. 7 can also be formed from a polymer.
- FIG. 8 shows a schematic cross-sectional view of a further security paper or document of value (26) with a substrate layer (27) (in the example a paper layer), which is provided with an opening (28).
- the opening (28) of the substrate (27) is closed from the upper side with a first film safety element (29).
- the first film security element (29) is applied to the upper side of the substrate layer (27) by means of a crosslinked adhesive layer (30) containing a first unstable feature substance.
- the opening (28) of the substrate (27) is also closed from the underside with a second film security element (31).
- the second film security element (31) is applied to the underside of the substrate layer (27) by means of a crosslinked adhesive layer (32) containing a second unstable feature substance.
- the opening (28) of the substrate layer (27) is substantially unfilled (i.e., the opening (28) is substantially filled with air).
- adhesive may also be present in the opening (28), ie the opening (28) is completely or only partially filled with adhesive.
- an adhesive here can the crosslinked, an unstable feature substance-containing adhesive the adhesive layer (30) or the adhesive layer (32) serve.
- the opening may also be filled up by means of an adhesive which contains either no feature substance or a conventional, stable feature substance.
- the opening may also be filled up by means of an adhesive containing one or more further unstable and / or conventional stable feature substances.
- the film security elements (29, 31) shown in FIG. 8 may have the same dimensions as the substrate (27) with regard to their length and width.
- the film security elements (29, 31) may independently have smaller dimensions than the substrate (27), e.g. in the form of a patch, label, strip or thread.
- Fig. 8 may be varied so that only one of the two adhesive layers (30, 32) has an unstable feature substance and the other adhesive layer has either no feature substance or a conventional, stable feature substance.
- the substrate layer (27) in FIG. 8 can also be formed from a polymer.
- a feature system or feature substance system based on a plurality of components ie on different feature substances
- it can be done depending on the stability of a separate contribution.
- all feature substances, regardless of their stability, can be incorporated into the adhesive layer.
- FIG. 9 shows a cross-sectional view of a crosslinked adhesive layer containing two different unstable feature substances.
- the adhesive layer has first regions (33) and second regions (34), wherein the first regions (33) contain the first unstable feature substance and the second regions (34) contain the second unstable feature substance.
- the first and second regions (33, 34) form an encoding.
- the adhesive layer shown in Figure 9 may be e.g. 3, one of the two adhesive layers (13) in FIG. 4, one of the two adhesive layers (23, 25) of FIG. 7, or one of the two adhesive layers (30, 32) of FIG 8 act.
- the adhesive layer contains an unstable feature substance only in the first regions (33).
- the second regions (34) contain either no, or a conventional, stable feature substance.
- the crosslinked adhesive layer contains the same unstable feature substance in both the first regions (33) and in the regions (34).
- the first regions (33) have a different application thickness of the adhesive rail compared to the second regions (34), resulting in (intensity) modulation of the feature signal.
- Example 1 (relates to the first class of compounds for the formation of the feature substance)
- the feature substance is incorporated into a polyurethane-based UV-curing adhesive (proportion: 1 weight percent).
- the resulting adhesive is used at an application thickness of 8 g / m 2 to bond two PET (polyethylene terephthalate) (PET) films together to form a value document substrate.
- PET polyethylene terephthalate
- the used (non-stabilized) feature substance decomposes on contact with water (solubility> 600000 mg / l) and the matrix-stabilized cation Fe 6+ used as dopant is also unstable in an aqueous environment and decomposes rapidly to form Fe 3+ ,
- Destruction of the adhesive layer of the document of value in particular by wet-chemical methods (for example saponification, acid cleavage, oxidative / reductive decomposition) is therefore without simultaneous destruction of the Feature not possible.
- combustion of the value document and subsequent digestion of the ash, for example via flotation, sedimentation or treatment with aqueous solutions, without simultaneous destruction of the feature is not possible.
- the feature substance is incorporated in a polyurethane-based, water-curing adhesive (proportion: 1 percent by weight).
- the adhesive thus obtained is used at an application thickness of 8 g / m 2 to bond a BOPP film (biaxially oriented polypropylene) and a paper sheet to form a value document substrate.
- the named feature substance reacts sensitively to aqueous environments (solubility> 10000 mg / l), especially in the presence of acids, bases or reducing agents. Destruction of the adhesive layer of the value document, in particular by wet-chemical methods (for example by saponification, acid cleavage, oxidative or reductive decomposition), is therefore not possible without simultaneous destruction of the feature substance. Likewise, a combustion of the value document followed by a digestion of the ash, eg by flotation, Sedimentation or by the treatment with aqueous solutions, in particular with acids, bases or reducing agents, without destroying the feature substance not possible.
- Example 3 (relates to the third class of compounds for the formation of the feature substance)
- the substance is incorporated into a methyl methacrylate-based UV-curing adhesive (proportion: 1 percent by weight).
- the adhesive is used at an application rate of 7 g / m 2 to bond together a PET (polyethylene terephthalate) (PET) film and a paper sheet to form a value document substrate.
- PET polyethylene terephthalate
- Said feature substance reacts sensitively to aqueous environments (solubility> 2000 mg / l), especially in the presence of acids, and the matrix-stabilized cation Mn 6+ used as dopant is also unstable in an aqueous environment and is able, depending on the pH -Value, for example, to disproportionate with the formation of permanganate ions MnOY and other manganese species or to decompose by reaction with oxygen or other species in low-valent manganese anions of the oxidation stages 2, 3, 4 and 5. Destruction of the adhesive layer of the value document, in particular by wet-chemical methods (eg by saponification, acid cleavage, oxidative or reductive decomposition), is therefore not possible without simultaneous destruction of the feature substance.
- wet-chemical methods eg by saponification, acid cleavage, oxidative or reductive decomposition
- Example 4 (relates to a non-luminescent feature substance)
- the feature substance is incorporated into a component of a 2-component epoxy adhesive.
- the adhesive obtained after combination of both adhesive components is used at an application thickness of 8 g / m 2 to bond two BOPP films (biaxially oriented polypropylene) together to form a value document substrate.
- Said feature substance is sensitive to aqueous environments (solubility> 200000 mg / l), especially in the presence of bases or oxidants (which causes oxidation of Fe (II) cations to Fe (III) cations).
- Destruction of the adhesive layer of the value document in particular by wet-chemical methods (eg by saponification, acid cleavage, oxidation). dative or reductive decomposition), is therefore not possible without simultaneous destruction of the feature substance.
- combustion of the value document followed by digestion of the ash eg by flotation, sedimentation or by treatment with aqueous solutions, in particular with bases and oxidizing agents, without simultaneous destruction of the feature substance is not possible.
- a heat-activated hot-melt adhesive such as Purmelt QR 4663 is dissolved to 20% in dry MEK.
- the whitish-hazy paint is triturated in a vibration mill with 5% of the acid-soluble luminescent substance Ca3 (PO) 2: Eu 2+ .
- This lacquer batch is aufgerakelt on polyester film to 50 ⁇ and dried at 80 ° C.
- an uncoated polyester film is placed and cured under pressure at 140 ° C for 30 minutes.
- a luminous intensity of 17 Skt at approx. 490 nm is determined in remission.
- After treatment with 0.5M HCl over 40 minutes the light intensity is unchanged at 17 Skt.
- the luminescent material is protected by the polymer embedding against harmful chemicals without losing luminosity.
- the extrudate is coated by a slot die onto a 40 ⁇ m thick BOPP film web, for example 1000 mm wide, with 10 g / m 2 of extrudate.
- the film coated with the extrudate can optionally be moved together via a calender and then with a second uncoated 40 ⁇ m film in order to laminate together by means of a heating and press section (140).
Landscapes
- Credit Cards Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014011383.3A DE102014011383A1 (de) | 2014-08-01 | 2014-08-01 | Sicherheitselement, Wertdokument-Substrat, Sicherheitspapier, Wertdokument und Verfahren zur Herstellung desselben und Trensferband |
| PCT/EP2015/001573 WO2016015872A1 (de) | 2014-08-01 | 2015-07-30 | Sicherheitselement, wertdokument-substrat, wertdokument und verfahren zur herstellung desselben und transferband |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3175037A1 true EP3175037A1 (de) | 2017-06-07 |
| EP3175037B1 EP3175037B1 (de) | 2018-12-05 |
Family
ID=54056153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15757436.9A Active EP3175037B1 (de) | 2014-08-01 | 2015-07-30 | Sicherheitselement, wertdokument-substrat, wertdokument und verfahren zur herstellung desselben und transferband |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3175037B1 (de) |
| DE (1) | DE102014011383A1 (de) |
| ES (1) | ES2706900T3 (de) |
| WO (1) | WO2016015872A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016008804A1 (de) | 2016-07-20 | 2018-01-25 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitsmerkmal und Wertdokument |
| EP3406459A1 (de) | 2017-05-22 | 2018-11-28 | Giesecke+Devrient Mobile Security GmbH | Sicherheitsmerkmal für einen datenträger |
| DE102018007096A1 (de) * | 2018-09-07 | 2020-03-12 | Giesecke+Devrient Currency Technology Gmbh | Sicherheitselement |
| DE102019122010A1 (de) | 2019-08-15 | 2021-02-18 | Polysecure Gmbh | Gegenstand, der Fluoreszenz-Markerpartikel umfasst, und Verfahren zur Identifizierung desselben |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3514852A1 (de) | 1985-04-24 | 1986-10-30 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Wertmarken, wie z.b. postwertzeichen und verfahren zur herstellung derselben |
| DE3843077A1 (de) | 1988-12-21 | 1990-06-28 | Gao Ges Automation Org | Sicherheitselement in form von faeden oder baender zur einbettung in sicherheitsdokumente sowie verfahren zur herstellung und pruefung derselben |
| AUPO728397A0 (en) | 1997-06-11 | 1997-07-03 | Securency Pty Ltd | Security document including a magnetic watermark and method of production thereof |
| DE19860093B4 (de) | 1998-12-23 | 2008-10-09 | Giesecke & Devrient Gmbh | Echtheitsmerkmalskombination für Wertdokumente |
| DE10047677A1 (de) * | 2000-09-25 | 2002-04-25 | Jackstaedt Gmbh | Lumineszenzfähige Beschichtungsmasse |
| DE10243653A1 (de) | 2002-09-19 | 2004-04-01 | Giesecke & Devrient Gmbh | Sicherheitspapier |
| NL1026430C2 (nl) | 2004-06-16 | 2005-12-19 | Vhp Ugchelen Bv | Veiligheidspapier, omvattende een door zijden begrensd substraatoppervlak, voorzien van een luminescentie vertonend veiligheidskenmerk. |
| DE102004063217A1 (de) | 2004-12-29 | 2006-07-13 | Giesecke & Devrient Gmbh | Sicherheitsmerkmal für Wertdokumente |
| AT502868B1 (de) | 2005-03-21 | 2008-06-15 | Oebs Gmbh | Sicherheitselement |
| US7699230B2 (en) | 2005-12-13 | 2010-04-20 | Ncr Corporation | Secure tag |
| DE102007044482A1 (de) * | 2007-09-18 | 2009-03-19 | Giesecke & Devrient Gmbh | Sicherheitselement mit Tamper Evident-Effekt |
| GB0807668D0 (en) | 2008-04-28 | 2008-06-04 | Innovia Films Ltd | Method of authenticating a polymer film |
| DE102009031877A1 (de) | 2008-12-23 | 2010-07-01 | Giesecke & Devrient Gmbh | Sicherheitselement mit verbessertem Heißsiegelklebstoff |
| DE102009036314A1 (de) | 2009-08-06 | 2011-02-10 | Giesecke & Devrient Gmbh | Verfahren zur Herstellung eines Sicherheitselements und nach dem Verfahren erhältliches Sicherheitselement |
| DE102009056634A1 (de) | 2009-12-02 | 2011-06-09 | Giesecke & Devrient Gmbh | Festkörperpartikel mit Siliciabeschichtung |
| US8445866B2 (en) | 2009-12-17 | 2013-05-21 | Honeywell International Inc. | Refractive index matched phosphors and substrates for security applications |
| DE102010063012B4 (de) * | 2010-12-14 | 2018-10-18 | Bundesdruckerei Gmbh | Aktivierbares Sicherheitselement |
| DE102011010127A1 (de) | 2011-02-02 | 2012-08-02 | Giesecke & Devrient Gmbh | Authentizitätssicherung von Wertdokumenten mittels photochromer Farbstoffe |
| WO2013134654A1 (en) * | 2012-03-09 | 2013-09-12 | United States Postal Service | Method and system for item authentication and customization |
-
2014
- 2014-08-01 DE DE102014011383.3A patent/DE102014011383A1/de not_active Withdrawn
-
2015
- 2015-07-30 ES ES15757436T patent/ES2706900T3/es active Active
- 2015-07-30 EP EP15757436.9A patent/EP3175037B1/de active Active
- 2015-07-30 WO PCT/EP2015/001573 patent/WO2016015872A1/de not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016015872A1 (de) | 2016-02-04 |
| DE102014011383A1 (de) | 2016-02-04 |
| EP3175037B1 (de) | 2018-12-05 |
| ES2706900T3 (es) | 2019-04-01 |
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