Microcapsule with liquid crystal
FIELD: physics, computer engineering.
SUBSTANCE: group of inventions relates to a printing layer of a security element for a data medium. The printing layer comprises elastic microcapsules. The microcapsules have inside them a cholesteric phase-forming liquid crystal which is fixed by a compressible elastomer having at least two areas distinguished by elastic properties. In an uncompressed initial state of the elastomer, the cholesteric phase on said areas has the same specified winding pitch of its spiral structure. Said areas exhibit identical optical properties. With uniform mechanical pressure on the printing layer, said areas experience different deformation and begin to differ by the winding pitch of the spiral structure of the cholesteric phase, thereby reflecting radiation of different colours. The printing layer becomes visible to a person. The invention also describes a method of making a printing layer, a security element, a data medium and a transfer element, having said security element.
EFFECT: invention provides high degree of security of a data medium.
12 cl, 6 dwg
The present invention relates to a microcapsule, to printing ink and the printing layer that contains/containing such microcapsules, the method of creating such a printed layer, a protective element containing such microcapsules, as well as to the media and to the bill of element with such a protective element.
Typically, the protective elements provide numerous preventing their counterfeiting security features. Such security features may represent a recognizable human characteristics, such as visually recognizable signs, i.e., verified person signs, or printed signs or symptoms that combines the features of the features of both these types.
The media, such as valuable or personal documents or other valuable objects, such as merchandise or packaging for various high-value products, in order to protect them against forgery supply protective elements, which allow to verify the authenticity of the object and simultaneously serve as protection against illegal or unauthorized copying. In addition, the protective elements often create distinct visual (optical) impression and therefore, in addition to performing its primary function of protective equipment are sometimes used also as a decorative e the elements of such carriers or packages. The protective element may be embedded in the material of such media, for example in the material of the banknote or smart card, or may be made in the form of a self-supporting or nasamones conversion element, for example in the form of nesamoney stickers or self-supporting labels, which after it was made is placed on the protected from a fake media or other object, for example, above the window in the media.
Under (material) media according to the present invention refers primarily banknotes, stocks, bonds, certificates, warrants, checks, expensive tickets, but also refers to other vulnerable forgery papers such as passports or other identification documents (skip), made in the form of maps media, mainly the chip card, as well as the elements to protect products from counterfeiting, such as labels, printing, packaging and similar items. The concept of "media" covers are also not suitable for the treatment of predecessors or semi-finished products such media, which, for example, in the case of counterfeit paper presented in quasiresonant and which subsequently undergo further processing, for example, banknotes, checks, stocks, and similar documents.
is such protective elements to prevent their forgery or imitation, for example, by reprographic reproduction on high quality multicolor Photocopying devices can have security features that multi-color photocopier unable to reproduce or recognize. As such protective elements is known, for example, use with optically variable properties of the elements that, when viewed at different angles to create different optical (visual) experience, primarily color impressions. There are various technologies of creation of functional layers or effect layers exhibiting such optically variable effects. For example, for this purpose you can use the optical interference layers in the form of a continuous layer or in the form of pigments. Such interference layers are usually thin-layer structure formed by a reflective layer, an absorbing layer and one or more located between the dielectric separator layers, and is made, for example, on the basis of mica, SiO2or Al2O2. Instead of the interference layers or formed by pigments (interference pigments) can also be used cholesteric liquid crystals, which are represented, for example, in the form of liquid silicone polymers.
According to CNAE visual impression of a person can create a so-called color Kipp effect, under different angles of view allows you to see different hues. Different visual impressions can also create the effect of the layer at a certain angle of view is completely transparent and therefore not visible to man, whereas a different angle of view (angle manifestations optical effect) is seen painted in a certain color tone.
The interference layers, printing inks with interference pigments or ink liquid crystal pigments often have considerable translucent all angles of view, and therefore the effect of the layer when it is viewed at an angle manifestations optical effect creates a relatively weak color impression, barely visible to the human eye. For this reason, a similar effect layers with high light transmission (translucent) to improve the distinctiveness of colour change is mainly put on dark or black background.
From EP 1972463 and WO 2008/017869 know next application of photonic crystals in protective elements. Photonic crystals are characterized by the ability to periodically change the refractive index, resulting in a so-called optical forbidden zone, in which the propagation of light in photonic crystal impossible. In these publications say, also, about the possibility of the particular influence on a periodic change of refractive index by external mechanical pressure, resulting in a photonic crystal with piezography properties.
In General, the term "plutonomies" called the material property change created them color impression when changing its spatial dimensions, for example, by mechanical pressure, resulting, for example, changes the wavelength range in which the reflected light. However, in these materials, the term "plutonomies" is used in a much broader interpretation, in accordance with "piezography" include all those materials which in response to a change in their spatial dimensions change its optical properties.
Known from EP 1972463 and WO 2008/017869 piezography photonic crystals, however, have only a small flexibility, elasticity respectively, and have adverse surface structure and for these reasons can only conditionally be used in securities, such as banknotes. In addition, the handling of such materials usually associated with substantial costs (see "Photonic Crystals - Advances in Design, Fabrication and Characterization", published by Wiley-VCH, 2004, 109-131153-173 ).
Microcapsules for encapsulation in chemicals widely represented in various publications. More detailed information about some special versions of the microcapsules can be found, for example, articles Skirtach and others (Laser-Induced Release of Encapsulated Materials inside Living Cells", Angew. Chem. Int. Ed., 45, 2006, SS. 4612-4617) and Angelatos and other Light-Responsive Polyelectrolyte/Gold Nanoparticle Microcapsules", J. Phys. Chem. B, 109, 2005,. 3071-3076). Such microcapsules are made of a polymer or polyelectrolyte and may have a multilayer structure. They consist of a hollow body inside which contains the desired substance. Depending on the purpose of the microcapsules can be performed in different sizes, with diameters typically lies in the nano - or micrometer range. Using such microcapsules enclosed in them chemical substance can be targeted to enter, for example, in biological or medical systems and then control the interaction of the encapsulated substance from the system through the purposeful destruction of the microcapsules. Purposeful destruction of the microcapsules thus provide, for example, by changing the pH, temperature or concentration of destroying the microcapsules substances or by irradiation, for example, a laser. To do this, such micro - or nanocapsules made of a suitable material or appropriately modify. In the case where the microcapsules are supposed to destroy by irradiation with a laser, the material of the shell is injected, for example, absorbing laser radiation substances. Such substances include, for example, organic and inorganic substances that absorb) the value of the corresponding region of the spectrum, or colloidal or nano-sized silver or gold particles. In subsequent microcapsules can, for example, to purposefully destroy the laser radiation of the ultraviolet region of the spectrum, the visible spectrum or near-or far-infrared region of the spectrum.
The present invention was based on the task of developing a protective element for the media, which would have better properties, which simplifies handling and increases provide them with protection from fraud, and to design suitable to create funds.
This problem is solved by using microcapsules, printing inks, printing layer, a method of creating a printed layer, a protective element, media and target element, as claimed in the respective independent claims. In the respective dependent claims presents various preferred embodiments of the invention.
The present invention is based on the fact that liquid crystal materials can be by capsulerebel so that, firstly, kept them relevant for use in protective elements properties such as optical properties, and secondly, have simplified their subsequent use, for example, in protective the ways.
The object of the invention in accordance with this is the microcapsule, which is located inside the liquid crystal. Very microcapsule is a hollow body filled with liquid crystal material. For use as the shell material of the microcapsules suitable known as such, materials such as synthetic and natural polymers (for example, polyurethanes, polyureas, melamine-formaldehyde resins, proteins (gelatin) and polylactate).
Liquid crystals can be represented, for example, in lyotropic or thermotropic. Thermotropic liquid crystals at lower temperatures presented in crystalline form, and at temperatures above the so-called temperature enlightenment isotropic. At a temperature lying in the intermediate interval, thermotropic liquid crystal presented in the form of liquid-crystalline phases. Properties of liquid crystals, it is preferable to choose such that they provided in terms of their processing and applications were presented in the form of a liquid crystalline phase.
In a preferred embodiment, the liquid crystal phase is a cholesteric phase. The microcapsule has the proper dimensions, in which are stored the optical properties of the cholesteric phase, relevant for the planned primeministerial. This applies, for example, to selective reflection of light with a wavelength proportional step of turns of the helical structure of the cholesteric phase, and to the direction of rotation of the reflected light that corresponds to the direction of twist of the helical axis of the helical structure of the cholesteric phase.
Microcapsules can be made isotropic, i.e., completely spherical or anisotropic, i.e., not completely spherical. In a preferred embodiment, the microcapsules are made anisotropic, due to the orientation of the cholesteric phase inside the microcapsules and orientation of the microcapsules when it is used, for example, in the printed layer is set to the preferred direction in which the helical axis of the helical structure of the cholesteric phase inside the microcapsules appropriately oriented relative to the printed layer. In addition, anisotropic microcapsules have increased compared to the isotropic microcapsules optical brightness.
Usually cholesteric liquid crystal contains a liquid crystal in the nematic phase and twisting substance, the so-called chiral impurity, giving the liquid crystal helical structure. The effect of the twisting of the substance, for example, its concentration affects the step of turns of the helical structure of the cholesteric phase, t is given as nematic liquid crystal is primarily determined by temperature-dependent phase behavior. In one preferred embodiment of the microcapsules provided the opportunity to influence the action of twisting of the material inside the microcapsule. This makes it possible, by external influence to regulate the step of turns of the helical structure of the cholesteric phase.
In one of the preferred options the microcapsule contains one or many of the smaller its size, micro - or nanocapsules containing a second twisting substance. In this case, in the subsequent by targeted destruction of smaller micro - or nanocapsules within a containing greater microcapsules can reclaim the second twisting substance inside the microcapsules and thereby set the pitch of the turns of the helical structure of the cholesteric phase to the preset value. The structure of the smaller shell containing a second twisting substance micro - or nanocapsules perfectly with the structure of the shell is larger, containing cholesteric liquid crystal and smaller micro - or nanocapsules of the microcapsules in the sense that smaller micro - or nanocapsules based on their purposeful destruction, for example, by exposure to laser radiation, whereas a larger microcapsule preferably not designed for such destruction.
An alternative to this or in addition, cholesteric phase which is thermochromic, thanks to the step of turns of the helical structure of the cholesteric phase can be adjusted accordingly set to the specified by setting the temperature to the required value.
In the following a preferred embodiment, the microcapsule along with the cholesteric liquid crystal contains the precursor of the polymer is a monomer or other prepolymers substance. In this case, the polymer may be then sew within the microcapsules, fixing in this way the position and orientation of liquid crystal molecules, and thus the orientation of the helical axis of the helical structure of the cholesteric phase inside the microcapsules. For this purpose, the polymer is preferably knit with the inner wall of the microcapsules. In a preferred embodiment, the stitching provide by irradiation suitable for this purpose radiation, such as ultraviolet region of the spectrum.
In another preferred embodiment, the polymer is a compressible elastomer, and the microcapsule is also elastic. Thanks to this step of turns of the helical structure is fixed cholesteric liquid crystal can be changed by application of external force, for example by mechanical pressure, in the direction of the helical axis of the helical structure of the cholesteric phase. Like change the pitch of the turns of the helical structure of cholesteric liquid crystal in the preferred embodiment, is reversible. In this case, the helical structure of the cholesteric phase is characterized compressed microcapsules modified, primarily reduced, compared to its uncompressed, so-called source condition step turns its spiral structure. In its original uncompressed state, the microcapsule reflects light with a longer wavelength, and in its compressed state reflects light, respectively, with shorter wavelength. This effect is based on the well-known fact that the wavelength of reflected light is equal to the product of step of turns of the helical structure of the cholesteric phase to the average refractive index inside the microcapsules. Thus the result is piezography effect.
In the following a preferred embodiment, the polymer is a compressible gel. To obtain such a gel to liquid crystal phase capsulebuy in a mixture of solvent from the Sol and then by exposure to ultraviolet (UV) radiation, convert it to a gel. The resulting microcapsule is also elastic.
In the proposed in the invention of the printing ink proposed in the invention microcapsules entered in a suitable binder. In the structure proposed in the invention of the printing ink liquid crystals can be applied to any framework. Nothing special or different requirements on the basis of DL is applying liquid crystals due to their capsulerebel in the microcapsules is not imposed. In addition, this printing ink can be applied on the basis of known printing methods, and for the application of encapsulated liquid crystal can be used widely used printing machines. The printing ink may optionally also contain known as such pigments or additives. In a preferred embodiment, printing ink and obtained from her a printed layer are optically variable properties.
To create proposed in the invention of the printing layer first on suitable basis put a layer proposed in the invention of the printing ink. For this purpose it is possible to use known methods of printing, preferably a method of deep, flexographic or screen printing.
After this step of turns of the helical structure of the cholesteric phase is set to specified. Set the pitch of the turns of the helical structure of the cholesteric phase specified in various ways, which are described in more detail below.
In conclusion, while maintaining the previously adjusted, the specified step of turns of spiral patterns sew the precursor polymer and in this way fix the cholesteric liquid crystal in the polymer inside the microcapsules.
At the next stage or simultaneously with the crosslinking polymer is fixed with a binder printing ink, which this purpose can be subjected to drying.In one of the preferred options proposed in the invention, a method of applying a printed layer of cholesteric phase inside the microcapsules shows thermochromic properties. Thanks to this step of turns of the helical structure of the cholesteric phase inside the microcapsules can be specifically set to the specified by regulation of the temperature of the applied printing ink when the crosslinking of the polymer. Such thermochromic cholesteric phases, a temperature increase leads to the decrease of the step turns their helical structure and thus to the displacement measured by the microcapsules of light in the wavelength range of the spectrum of electromagnetic radiation. In addition, printing ink you can use more heat-retaining pigments, which allows cross-linking of the polymer to maintain the temperature at a constant level. In addition, in the printing ink in order to ensure the possibility of targeted its heating the applied layer can be added absorbing electromagnetic radiation of a substance, such as absorbers for laser radiation. Similarly the temperature of the applied printing ink can be reduced to increase in this way the step of turns of the helical structure of the cholesteric phase, and thus the displacement of the reflected printed layer of light in long is volnovye range of the spectrum of electromagnetic radiation.
In the process of crosslinking of the polymer preferably is similar to the applied printing ink with microcapsules containing thermochromic cholesteric phase, had locally different temperatures, allowing you to get within the printed layer cholesteric phase with locally distinguished specified step of turns of the spiral structure. Due to this, a printed layer on different sections of the reflected electromagnetic radiation with different wavelengths.
In an alternative preferred embodiment of the proposed invention in method step of turns of the helical structure of the cholesteric phase is set to the specified by regulation of the twisting action of the substance inside the microcapsules. The twisting action of the substance can be adjusted, for example, by modifying the twisting of matter, changes of its concentration or add another twisting of the substance.
In the following preferred embodiment, use of the photosensitive encapsulates the substance. Such materials, on the chirality or twisting action which can be influenced by exposure to optical radiation, e.g. laser radiation, often referred to as adjustable chiral materials ("tunable chirale materials"). Laser radiation when this mainly affects Zack is usevalue substance in that regard, his twisting force is changed due to the rupture of relations, rotate or rearrange his molecules. The wavelength of the laser radiation, the energy density and the duration of pulses set at the desired value to obtain the desired twisting action of the substance, and thus the required step of turns of the helical structure of the cholesteric phase. For example, you can use twisting substances based on binaphthyl, the twisting action which can be adjusted by exposure to radiation the ultraviolet region of the spectrum. Alternatively, you can also use substances from the class of so-called molecular switches that show the twisting action of the substances and in which under the influence of shortwave radiation in the visible region of the spectrum flow corresponding isomerization reactions.
Such a reaction can be initiated in a photosensitive encapsulates the substance and result of multiphoton processes occurring upon irradiation with electromagnetic radiation of long wavelength visible spectrum and infrared (IR) region of the spectrum. Such multiphoton processes usually occur only at high power radiation, which, however, it is possible to provide in the application of short - and ultramarathoners the manhole is s, if necessary, combined with a strong focusing of the laser radiation. To this end it is preferable to use the laser near infrared range, for example, lasers yttrium aluminium garnet doped with neodymium.
The application of this laser also allows you to set the twisting action of the substance in the printed layer at different particular sites, for example, by a corresponding deflection of the laser beam influencing the twisting action of the substance. In another embodiment, to ensure that locally different exposure of the printed layer can also use masks or stencils, preferably by irradiation with ultraviolet region of the spectrum.
In yet another variant using thermolabile twisting substance that can be achieved by appropriate irradiation partially or completely destroy. Heat radiation can be further strengthened by the inclusion of an absorbing species in the applied printing ink. Such intense thermal radiation is manifested, for example, in the area of focus of the laser beam. A similar effect when it leads to the complete destruction twisting substances, resulting disappears spiral structure, and with it ceases to exist and cholesteric phase, also called "thermal racemizations". This rat is isace takes place primarily at burylov, for example binaphthyl, and the helical compounds.
In yet another embodiment proposed in the invention method, the twisting action of the substance change by adding another second - twisting substances. This second twisting the substance while it is preferable to prepare encapsulated in the sealed capsules inside the microcapsules, and the step of turns of the helical structure of the cholesteric phase is set to the specified purposefully destroying at least part of such capsules, which can be, for example, the appropriate irradiation. When this second twisting substance may increase or, on the contrary, mitigate the effect of initially present torquing substance, and thereby respectively to decrease or increase the pitch of turns of the helical structure of the cholesteric phase.
In one of the preferred embodiments proposed in the invention of the printing layer, it is elastically compressible. This caused the printing ink contains elastic microcapsules, in which the polymer is a compressible elastomer. In addition, in this case and binder printing ink has to be in a fixed state of the corresponding elastic properties. In a preferred embodiment, the printed layer has adjustable elastic St. isthmi, which can be adjusted through targeted crosslinking of the elastomer inside the microcapsules and by appropriate processing of the binder printing inks. For this binding, for example, also fixed by stitching.
Because of this, you may create a printed layer, optical and optionally elastic properties which can be adjusted after sealing the basis of the printing ink.
Such elastically compressible printing layer, it is preferable to make such elastic properties to appropriate mechanical pressure on him led to changing the pitch of turns of the helical structure of the cholesteric phase by an amount sufficient to enable the observation of the expected plethron effect.
Instead, or in addition to the binder printing ink or inside the microcapsules can also include an elastic, compressible filler.
In another preferred embodiment, the printed layer has at least two sections which differ elastic properties. Thus within the received print layer, you can create separate sections, which differ in their optical and/or elastic properties. In the presence of identical optical properties on both these areas in the uncompressed initial state of the elastomer, when the cholesteric f is for them both has the same specified step of turns of the spiral structure, these plots with uniform mechanical pressure on the printed layer undergo different deformation, resulting in both of these plots are in a compressed state printed layer begin to vary between a pitch of the turns of the helical structure of the cholesteric phase and thereby to cause reflection of their different colors can after mechanical pressure or mechanical pressure, for example, visually perceived by a human. In the preferred embodiment, both plots with the appropriate attached form reproduce visually perceived information.
In one preferred embodiment of elastically compressible printing layer, it has the property to return after compression uncompressed original state only with a delay. Thanks to this property of the printed layer, and at the end of the mechanical pressure can be observed created piezography effect. The presence of such properties, it is preferable in the case when the force of the mechanical pressure is applied, for example, a human finger, closing the protective element during such mechanical pressure on the printed layer. To ensure the availability of similar properties, elastic recovery of the printed layer of his form with reset on ekononomicheskoe pressure can effectively implement resilient compressible filler.
Another object of the invention is a protective element that contains proposed in the invention microcapsules, which in the preferred embodiment, are in the printed layer. In order to increase the visual distinctiveness of the reflected light printed layer in the proposed invention the protective element is preferably positioned in the viewing direction (in the direction of the line of sight) in front of a dark background with a high absorption coefficient, primarily black background.
In one preferred embodiment of the proposed invention in the protective element elastically compressible printing layer in the direction of line of sight behind the printed layer is information that is hidden in the uncompressed, original condition printed layer and becomes visible only when it is compressed. Provided this effect is mainly due to the fact that such information on its color stands out against a dark background, but the color identical to the color of the light reflected by the cholesteric phase in the uncompressed initial state of the printing layer.
In the following embodiment, the proposed invention is a protective element in the direction of line of sight before printed layer is another layer of optically variable effect. The presence of such a layer can further increase provided protect Tim element degree of protection against forgery.
In a preferred embodiment of the proposed invention in the protective element supported on a carrier of information or is part of a conversion element that allows you to put a protective element in such media.
Other embodiments of the invention and its advantages are discussed below in more detail based on examples with reference to the accompanying description of the drawings. The following examples represent preferred embodiments of the invention, which do not limit its scope. Attached to the description of the drawings shows a schematic images that do not reflect the real relationship between the size, and used exclusively for a more visual explanation of various embodiments of the invention. Attached to the description of the drawings in particular, it is shown:
in Fig.1 - bill with a protective element,
in Fig.2 is a view in section of microcapsules,
in Fig.3 is a diagram illustrating the introduction of a second twisting substances
in Fig.4 is a view in section of elastic microcapsules,
in Fig.5 - layer with locally different optical and/or elastic properties and
in Fig.6A and 6b is a species in the context of printed layers.
In Fig.1 as a (material) media shows a banknote having a protective element 2 to the circuit layer 10 containing microcapsules 3.
On the IG.2 shows a section of microcapsule 3 cholesteric liquid crystal phase 4 inside it. For spatially fixing a cholesteric phase 4, as well as to compensate for the dependence of the step of turns of the spiral patterns on the temperature of the liquid crystal molecules of the cholesteric phase 4 sew with schematically shown in the drawing polymer 5 with the inner wall of the elastic microcapsules 3, and also between themselves. In this example, the cross-linked polymer also contains cross-links. The desired crosslinking can be achieved by functionalization of the liquid crystal molecules suitable terminal functional groups, such as acrylates, and due to the functionality of the elastic material of the microcapsules, for example, due to the presence of polymer systems with acrylic functional groups, such as, for example, acelerando gelatin.
The required optical properties of the microcapsules give a setting step of turns of the helical structure of the cholesteric phase to set up the staple of the polymer. For this purpose inherent in the cholesteric phase thermochromic properties. With this purpose, the temperature of the microcapsules 3 when sewing set to an acceptable value to obtain the desired predetermined step of turns of the helical structure of the cholesteric phase 4 in the microcapsule 3.
In another embodiment, it is possible to purposefully control the twisting action of the substance or its end is Tracey. For this to cholesteric liquid crystal 4, containing nematic liquid crystal and twisting substance admixed another chiral substance encapsulated in the form of influencing the step of turns of spiral patterns. This second twisting substance encapsulated in micro - or nanocapsules, which are modified so that they can purposefully destroy by irradiation. In this embodiment, micro - or nanocapsules destroy by irradiation with laser radiation the ultraviolet region of the spectrum, the visible spectrum or infrared spectral region with a wavelength of, for example, 1064 nm or long-wave infrared spectral region with a wavelength of, e.g., 10.6 μm. The destruction of micro - or nanocapsules provide by introducing into the material of their shell of organic and inorganic substances which absorb radiation of the corresponding region of the spectrum. This is primarily suitable colloidal or nano-sized silver or gold particles. Capsules may consist of one or several layers. In one not shown on the drawings variants using activated by laser radiation of gas-forming material (pore) that, when heated, for example, emit laser radiation in the micro - or nanocapsules gas. Occurring when this led is placed micro - or nanocapsules in volume, there is destruction. Released as a result of the destruction of the second capsules twisting substance may increase or, conversely, to decrease the effect of the initial twisting of the substance of cholesteric liquid crystal.
In the form shown in Fig.3 embodiment, inside the microcapsules 3 along with the stitching of the cholesteric liquid crystal 4 is a lot like micro - or nanocapsules of smaller size, containing the second twisting substance. From shown in Fig.3 in the top row of micro - or nanocapsules by the targeted destruction of exposure to laser radiation release second twisting substance that reduces the effect of the initial twisting of the substance and thereby increases the step of turns of the helical structure of the cholesteric phase 4. As a result, the wavelength of the reflected light is shifted in the spectral region with large wavelengths (λ3). With increasing duration and intensity of irradiation, micro - or nanocapsules destroying their radiation increases the number of destroyed micro - or nanocapsules smaller, and thus the amount released from them the second twisting substances, as well as a large amount changing step of turns of the helical structure of cholesteric liquid crystal, together with the increases and the wavelength is reflected from the ETA (λ 4). In the example shown in Fig.3 in the bottom row of micro - or nanocapsules illustrates the reverse situation, when the second twisting substance enhances the effect of the initial twisting of the substance and thereby decreases the step of turns of the helical structure of the cholesteric phase 4 and the color shift of the reflected light in the range of shorter wavelengths (λ1, λ0).
Each destroyed micro - or nanocapsules released a certain amount of encapsulated them in a second twisting substances, and therefore its influence on the color of the reflected radiation is increased stepwise or discrete. Custom range colour change and its gradation set by varying the number and size of micro - or nanocapsules.
Smaller sizes of micro - or nanocapsules can also be filled with a substance that completely violates chiral order cholesteric phase 4, which for this reason has lost the ability to selective reflection of light.
In Fig.4 elastically compressible micro capsule 3 is shown in a compressed state. The microcapsule 3 can be compressed by mechanical pressure on it, which is schematically indicated by the force F. as a Result, the microcapsule 3 compared to its uncompressed state in which it is shown in Fig.2, decrease the step of turns of spiral structure holes aricescu phase 4, and thus the wavelength of the reflected light. When light is incident in the direction of the helical axis of the helical structure of the cholesteric phase 4, it acts on the incident light as a Bragg grating, and a step of turns of the helical structure of the cholesteric phase 4 is determined by the wavelength of the reflected light. Therefore, the cholesteric phase 4 uncompressed microcapsules 3 reflects light with a longer wavelength (λ2) than in its compressed state (λ1).
Schematically indicated in Fig.4 stitched polymer can be formed functionalized side chains, for example, mono-, bi - or polyfunctional acrylates, liquid crystal molecules of the cholesteric phase 4. Such side chains can be made by UV radiation. The result is formed by the side chains of the grid in which cholesteric phase 4 is fixed in its spatial location and position. Formed by the side chains grid sew this so that it becomes elastic properties and compressibility, so the microcapsule exhibits required piezography properties, as well as the required elastic properties and elastic properties restore its shape. For this purpose the most suitable elongated, flexible, aliphatic or CNS spacer elements group with terminal acrylate is functionalname groups.
To adjust the density (concentration) of nodes formed by the side chains of the grid and the length of its internodes ratio between photoinitiators and mono-, bi - or polyfunctionally Monomeric acrylate set to the appropriate value. In addition, for the same purposes you can also use flexible, bifunctional linkages, such as n-butyldiglycol. In addition, formed by the side chains grid has after stitching sufficiently low glass transition temperature Twiththat is to ensure there is always enough of elasticity below the minimum application temperature of the microcapsules.
In addition, the elastic properties of the microcapsules can also be changed by breaking ties formed in the side chains of the grid. For this you can apply the UV-radiation sources or short - or ultramarathoners the lasers in the visible or infrared range.
In another embodiment, a cholesteric liquid crystal capsulebuy in an acceptable solvent mixture with a colloidal solution and then by exposure to UV radiation, convert it to a gel.
By acceptable stitching liquid crystals cholesteric phase 4 formed in the side chains of the net, in addition, suppresses changing the pitch of turns of the helical structure of the cholesteric phase 4 depending on the temperature.
Not shown in the drawings variations the ones inside the microcapsules similarly shown in Fig.3 variant is a lot of micro - or nanocapsules of the smaller sizes. But in this case, the encapsulated substance containing other curable components and photoinitiator, allowing additional opportunities for regulation of the elastic properties of the microcapsules.
In the form shown in Fig.4 embodiment, the elastic microcapsule 3 contains, in addition, the elastic filler 6, whereby it is possible to adjust the reversibility of elastic compression of the microcapsules and the properties of the elastic recovery of the microcapsule its shape with the return in the elastic initial state after mechanical pressing with a force F. for example, the elastic properties of the microcapsules can be adjusted so that it only delayed and slowly went back to its elastic initial state. Thanks man looking at a printed layer 10 with such microcapsules can be seen manifested in compression effect even in the case where the print layer 10 is under pressure is closed, for example, a finger. In addition, the elastic properties of the microcapsules can be adjusted so that after the termination of mechanical pressure on a printed layer 10 with such microcapsules he created humans dynamically changing impression.
Elastic filler may be solid (solid) or hollow (hollow). For use as m the material of such elastic filler suitable for example, latex, natural or synthetic rubber. However, the elastic filler may be also formed certain air inclusions. The filler may in addition also contain protective substances (substances which due to their specific properties are used as protective elements) or absorbers of UV radiation, and may also have the ability to change under the action of laser radiation or other properties, allowing to adjust the elastic properties.
Various possibilities for the regulation of elastic and optical properties of microcapsules in the printed layer 10 allows first of all to create within different sections 8, 9, which differ in their elastic and/or optical properties, as is schematically shown in Fig.5. Similar plots can be created using stencils as light or purposefully rejecting the irradiating beam, for example a laser beam. In this way individualiziruyut printed layer 10. For example, different sections 8, 9 within the printed layer 10 can be performed in the form of information, visually perceived by a person. To improve the distinctiveness of the optical effects created by different parts of the printed layer 10, it features a dark layer with a high absorption coefficient, for example, a black layer. If there is such a light layer, not reflected from the cholesteric liquid crystal microcapsules, is absorbed by the base and thus does not distort the optical impression.
In another, not shown in the drawings embodiment, the background elastically compressible printing layer 10 is made is not a solid dark or black, and plays some color information visually perceived by a person. The color of such information correspond to the color that is reflected from the entire surface of the print layer 10 located in the viewing direction in front of this background. In accordance with this, in the uncompressed initial state of the printing layer 10 people visually perceive only the reflected color that hides the currently playing background information of the same color. Only when the change in the reflected color, for example, when mechanical pressure is applied on the printed layer 10 becomes visible beneath him information.
In another, also not shown in the drawings, the embodiment piezography microcapsules with a cholesteric liquid crystal phase have between two transparencies, example, polyethylene terephthalate (PET) films, for example, banknotes inside of the multilayer film. The distance between the films can accordingly be chosen so that between them could, for example, to apply a greater compared to normal pecat the mi layers, the number of microcapsules, that leads to a significant increase of visual distinctiveness optical and plethron effect.
In Fig.6A shows a printed layer 10 with the microcapsules 3. In section 8 of this printed layer 10 cholesteric phase 4 is inside the microcapsules 3 is increased in comparison with other areas step turns its spiral structure. Therefore, in section 8, the wavelength of reflected light on it shifted compared to the surrounding part of the printed layer in a large range of wavelengths in the spectrum of electromagnetic radiation.
In Fig.6b shows the elastically compressible printing layer 10 with an elastic microcapsules 3. Section 8 of this printed layer has excellent from the surrounding areas of the printed layer elastic properties. In accordance with this printed layer 10 with a uniform pressure on him is compressed on its section 8 greater than in their surrounding this area of the part. Therefore, on a plot of 8 printed layer 10 cholesteric phase 4 is inside the microcapsules 3 are reduced compared to other sites step turns its spiral structure. For this reason, in section 8, the wavelength of reflected light on it shifted compared to the surrounding part of the printed layer in the range of shorter wavelengths in the spectrum of electromagnetic radiation.
1. A printed layer containing elastic microcapsules, the inside of which is formed of cholesteric phase liquid crystal and in which he recorded the polymer, representing a compressible elastomer, and having at least two differing elastic properties of the plot, which in the uncompressed initial state of the elastomer, when the cholesteric phase on both of them has the same specified step of turns of the spiral structure are identical optical properties and uniform mechanical pressure on the printed layer undergo different deformation, resulting in both of these plots are in a compressed state printed layer begin to vary between a pitch of the turns of the helical structure of the cholesteric phase and thereby to cause reflection of their different colors become after mechanical pressure or mechanical pressure visually perceived by a person.
2. A printed layer on p. 1, characterized in that it is elastically compressible and has the property to return after compression uncompressed original state only with a delay.
3. A printed layer on p. 1, characterized in that the cholesteric phase is a thermochromic or be affected by the actions of at least one torquing substances in which each of the microcapsules preferably contains one or more capsules with a second twisting substance.
4. A method of creating a printed layer on p. 1, implying that n is the Foundation put a layer of printing ink, containing microcapsules, inside of which is formed of cholesteric phase liquid crystal, and also contains a precursor polymer, suitable for fixing a liquid crystalline phase inside the microcapsules and represents a compressible elastomer, the step of turns of the helical structure of the cholesteric phase is set to the specified and the precursor polymer is converted into a polymer, such locking by the specified step of turns of the helical structure of the cholesteric phase inside the microcapsules, the precursor polymer is converted into an elastomer locally in various ways so that the printed layer is formed of at least two sections with different elastic properties.
5. The method according to p. 4, in the exercise of which use thermochromic cholesteric phase, and the step of turns of the helical structure of the cholesteric phase is set to the specified by regulating its temperature.
6. The method according to p. 4 or 5, at which step of turns of the helical structure of the cholesteric phase is affected by the action of at least one torquing of the substance, and the step of turns of the helical structure of the cholesteric phase is set to the specified by regulating the action of the at least one torquing substances.
7. The method according to p. 6, in the exercise of to the which use photosensitive encapsulates the substance, which has changeable by irradiation effect, and the step of turns of the helical structure of the cholesteric phase is set to the specified by irradiation twisting substances, preferably by exposure to electromagnetic radiation in the infrared region of the spectrum.
8. The method according to p. 6, in the exercise of which use thermolabile torquing matter, which has reduced by heat action, and the initial step of turns of the helical structure of the cholesteric phase is set to the specified by heat.
9. The method according to p. 6, the implementation of which in each of the microcapsules enter into one or more capsules with a second twisting substance, and the step of turns of the helical structure of the cholesteric phase is set to the specified by the targeted destruction of at least part of such capsules.
10. The protective element containing a printed layer on one of the PP.1-3.
11. A storage medium having a protective element according to p. 10, and preferably represents a valuable object that is protected from a fake paper, protected from a fake document or product packaging.
12. Conversion element having a protective element according to p. 11 and deposited on a substrate, preferably with the possibility of separation from her.
SUBSTANCE: invention relates to a photoinitiator, a method for production and use thereof and a coating composition. The photoinitiator is a compound of formula: (PI-Sp)n-BB (I), where PI is a thioxanthone group, optionally including additional substitutes in the Sp group; Sp is a spacer link selected from a group consisting of or , BB is a backbone chain link selected from a group consisting of
The method of producing the photoinitiator includes the following steps: (a) optionally substituted thioxanthone, containing at least one hydroxy group, reacts with epichlorohydrin or haloacetic acid ester; (b) the compound from step (a) reacts with the corresponding backbone chain link containing a functional group, or the compound from step (a) reacts with a compound containing a functional group, and the obtained intermediate then reacts with the corresponding backbone chain link; optionally (c) obtaining derivatives of the compounds from step (b). The photoinitiator is used to cure a coating composition, preferably printing ink containing a polymerisable component.
EFFECT: invention enables to obtain a photoinitiator with good curing activity, faint odour and good compatibility with other components of the composition.
10 cl, 1 tbl, 4 ex
SUBSTANCE: invention relates to a layered material coated with printing paint or printing lacquer. The printing paint or printing lacquer contains as binder at least one non-radiation cured aromatic polycarbonate based on geminally disubstituted dihydroxydiphenyl cycloalkane and as binder solvent at least one radiation cured monomer selected from a group comprising acrylates, methacrylates, vinyl ethers and nitrogen-containing compounds with an ethylene double bond. Said binder is dissolved in the solvent. After curing, the solvent remains in the printing ink or printing lacquer in a chemically cross-linked state.
EFFECT: invention provides high adhesion of the printing ink or printing lacquer to a base, prevents drying thereof on template glass during printing, the need for dilution thereof with a solvent and the undesirable washing off of paint from the print during pressure moulding.
16 cl, 11 tbl, 11 ex
SUBSTANCE: present invention relates to use of a composition which contains: a) 0.1-20 wt % binder which contains a polycarbonate derivative based on geminally disubstituted dihydroxydiphenyl cycloalkane, b) 30-99.9 wt % solvent, c) 0-10 wt %, with respect to dry mass, dye or mixture of dyes, d) 0-10 wt % functional material or mixture of functional materials, e) 0-30 wt % additives and/or auxiliary substances or a mixture thereof, as jet printing ink. The invention also relates to a method of producing a composite and a composite which contains a polymer layer on which there is a jet printing layer of said composition.
EFFECT: invention is aimed at producing agents which enable to use jet printing in making counterfeit protected documents and/or valuable documents based on polycarbonate layers, and which enable to deposit jet printing layers on layers which meet all optical requirements, which can be coloured, wherein lamination does not deteriorate optical properties of the layers and said layers do not act as a separating layer and facilitate formation of a monolithic composite.
31 cl, 2 tbl, 2 dwg, 8 ex
SUBSTANCE: printed paint composition contains aliphatic acid-modified polyester (A) with an attached polybasic acid. The polyester (A) has degree of modification of 35-65 wt %, hydroxyl number of 60-200 mg KOH/g, acid number of 10-60 mg KHO/g and weight-average molecular weight with respect to styrene of 3000-30000, a pigment component and a solvent. Also disclosed is a method of coating a seamless can with said paint composition.
EFFECT: paint composition has high stability, compatibility with coating varnish and high adhesion to the surface of a seamless can while providing good characteristics of coating film.
5 cl, 5 tbl, 20 ex
SUBSTANCE: invention relates to organometallic latent catalytic compounds which are suitable as catalysts in polyaddition or polycondensation reactions which are catalysed by a Lewis acid type catalyst, particularly for cross-linking a blocked or non-blocked isocyanate or an isothiocyanate component with a polyol or a polythiol to form polyurethane. Polyaddition or polycondensation reactions are initiated by that a catalyst is released while holding in electromagnetic radiation in wavelength range of 200-800 nm. The latent catalytic compound has formula I or II, Me(FG)(m-x)Ax (I); Ax(FG)(m-1-x)Me-O-Me(FG)(m-1-x)Ax (II), where Me is Sn, Bi, Al, Zr or Ti; m is an integer from 1 to the coordination number of Me; x is an integer from 0 to (m-1); A is a C1-C20 alkyl, halogen, C7-C30 aralkyl, C1-C20 alkoxy group, C2-C10 alkanoyloxy group, C6-C18 aryl or C6-C18 aryl, which is substituted with one or more C1-C20 alkyls; and under the condition that if x is greater than 1, A are identical or different; and FG independently represents a group of formula (Z), (B), (C), (D), (E), (F), (G), (L) or (M)
where values of radicals are given in the claim. The invention also relates to a polymerisable composition and a method for polymerisation in the presence of said catalytic compounds. The invention enables to initiate the reaction only if desired by external activation, such as heating or light.
EFFECT: widening the operating window with a polymer mixture until the chain reaction begins.
12 cl, 14 tbl, 67 ex
SUBSTANCE: invention relates to polyamide-based printed films which are used as casings for food products, particularly artificial sausage casing. Disclosed is a printing ink system for printing on (co)polyamide-based films. Said system contains a radically curable primer ink and UV radiation radically curable printing ink which forms an almost colourless layer of primer ink. The primer ink contains a reactive compound which, in one molecule, contains a group capable of bonding with a (co)polyamide surface and an ethylenically unsaturated group which can undergo radical-initiated polyaddition. The invention also discloses a (co)polyamide-based single- or multilayer film which is printed with said printing ink system and a method for production thereof.
EFFECT: printing ink system enables to print on (co)polyamide-based food films with high adhesion to the film, resistance to friction, scratching even without an additional lacquer coat, mechanical and thermal processing, resistance to migration of ink components, which prevents foreign odours from food products.
27 cl, 1 ex
SUBSTANCE: carrier based on high-density polymer is decorated with ink for printing, comprising at least one pigment and one binder. The binder is an oxygenised polyolefin wax in the form of an aqueous emulsion, and the wax has a Brookfield viscosity of less than 5000 mPa*s at 150°C and a pH level of 28 to 32 mg KOH/g, and the said ink has a viscosity of less than 2000 mPa*s at 25°C. The ink is applied in a continuous or discrete manner on at least one surface of the carrier. The subject of the invention is also a decorated carrier based on high-density polymer, a multi-layered product, and a method of manufacturing of a multi-layered product with a coating of the said ink.
EFFECT: creation of the ink of simpler composition and easier to use.
16 cl, 1 dwg, 4 tbl
FIELD: textiles and paper.
SUBSTANCE: non-woven fabric is proposed, on the visible surface of which the ink composition is applied comprising from about 40 wt % to about 80 wt % of the dry weight of the ink of linking agent - aziridine oligomer with at least two aziridine functional groups. Also an absorbing article is proposed comprising a liquid-permeable upper layer, an absorbing core and a liquid-impermeable lower layer that contains the specified non-woven fabric with the said applied ink composition. The application of ink on the non-woven fabric can be carried out by the method of flexography or a method of ink-jet printing.
EFFECT: printed non-woven fabric has high resistance to abrasion even in case of its contacting with fatty substance.
16 cl, 2 dwg, 2 tbl, 2 ex
SUBSTANCE: water based flexographic contains biodegradable polyhydroxyalkanoate (PHA) consisting of monomers having the following formula: where n is an integer from 1 to 5, and R1 is selected from a group comprising hydrogen, alkyl from C1 to C20, and alkenyl from C1 to C20, and having molecular weight ranging from 500 to 5000000 g/mol, binder substance which is three-block amphiphilic compound having two hydrophobic terminal areas with linear and/or branched aliphatic chains CnH2n+2, n = 1-40, and one central hydrophilic area - polyethylene glycol and its derivatives; or having one central hydrophobic area with linear and/or branched aliphatic chains CnH2n+2, n = 1-40, and two hydrophilic terminal areas, a solvent, and a dye or pigment in amount sufficient for leaving a visible mark on a base. Concentration of PHA in the ink ranges from 20 to 80% (weight/volume), concentration of the binder ranges from 0.5 to 20% (weight/volume), concentration of the solvent ranges from 1 to 25% (weight/volume) and concentration of the dye or pigment ranges from 1 to 40% (weight/volume). Described also is a method of preparing water based flexographic ink and a printing composition which contains the said flexographic ink.
EFFECT: improved biodecomposition properties.
13 cl, 6 ex
SUBSTANCE: invention pertains to polyurethane resin, which is a product of a reaction between at least one diisocyanate and components, containing functional groups, which have capacity to react with isocyanates, with the following composition: (a) first group, which is formed by one or more polyester-polyols based on ethers, each of which has average molecular mass ranging from 400 to 12000 g/mol, (b) second group, formed by one or more poly hydroxilated resins, chosen from a defined group of resins, (c) optional third group, formed by one or more polyols, each of which has average molecular mass, equal to or less than 800 g/mol, which are also chosen from a defined group of polyols, and (d) at least one amine and a reaction chain-stopping agent. The ratio of equivalent masses of diisocyanate and components, containing functional groups, with capacity to react with isocyanates, is chosen such that, naturally all isocyanate groups of diisocyanate are present as a product of the reaction with one of the above mentioned functional groups, with capacity to react with isocyanates. The invention also relates to the method of obtaining the above mentioned polyurethane resin, to polyurethane resin obtained through such methods, to coating for plastic substrates, containing the proposed resin, as a polyolefin binding substance, to use of such a polyurethane resin as a film forming substance in printing ink for printing on plastic substrates, as well as to the method of obtaining a laminate, which has a layer obtained when printing an image, including stages (a)-(d), with use of coating from polyurethane resin, and to a laminate, obtained using such a method.
EFFECT: obtaining a coating from polyurethane resin, with good heat resistance and excellent initial adhesiveness.
FIELD: process engineering.
SUBSTANCE: invention relates to production of protective films applied on valuable documents or data carriers. This film features the following structure: a) first carrier substrate; b) first lacquer layer hardened by radiation and including active optical structure; c) first metal layer; d) protective lacquer layer; e) gluing layer; f) second carrier substrate; g) second lacquer layer hardened by radiation; h) second metal layer. If necessary, this film comprises protective lacquer layer (i) and glue coat (k). Note here that adhesion between g) and h) or f) and g) is notably higher than that between the other layers.
EFFECT: detection of manipulation at protected object.
9 cl, 6 dwg
SUBSTANCE: invention relates to a multilayer film composite, an identification smart card, an identification document, a personal data medium etc, having a multilayer film composite, use of said multilayer film composite, production thereof and a polycarbonate or copolycarbonate composition. The multilayer film composite has at least one layer of polycarbonate or copolycarbonate and is characterised by that the polycarbonate or copolycarbonate further contains one or more additives selected from a group comprising petaerythritol tetrastearate, glycerol monostearate, propanediol stearate, stearyl stearate and mixtures of said compounds. Total concentration of the additives selected from said group ranges from 2.1 to 6% with respect to the weight of the composition.
EFFECT: obtaining a film for producing multilayer systems, having the necessary level of mechanical properties and characterised by a higher layering suitability compared to prior art, high layering adhesion and improved processing properties.
7 cl, 1 tbl, 1 dwg, 4 ex
FIELD: physics, optics.
SUBSTANCE: proposed element comprises first and second optically variable element including the first and second optically variable thin-film laminar interference devices. Note here that said the first and second optically variable thin-film laminar interference devices are located so that they can be viewed together. The band covered by second device 3rd and 4th lengths waves lies in the band covered by first device 1st and 2nd lengths waves. This allows determination of definite light incidence angle whereat peaks of k-order of reflection of said 1st and 2nd interference coincide. Said 1st and 2nd optically variable interference devices feature identical interference structures so that they display true spectral matching at said preset light incidence angle while at other angles they feature different spectra.
EFFECT: high degree of protection against counterfeit.
19 cl, 3 dwg
SUBSTANCE: invention relates to a sheet of volume hologram for embedding, as well as paper and map for forgery prevention, comprising such sheet. The sheet of volume hologram for embedding comprising: a layer of a volume hologram; and a substrate located on only one side surface of the volume hologram layer by using an adhesive agent. Resistance to delamination of the volume hologram layer and the substrate is 25 g.wt./25 mm or more. Paper for forgery prevention comprises the said sheet of volume hologram. The map is a volume hologram sheet located between two sheets.
EFFECT: production of a thin sheet of a volume hologram for embedding, resistant to mechanical stress, such as tensile stress, shear stress and compressive stress, during treatment, even under conditions of heating, as well as production of paper for forgery prevention and a map, using this sheet.
8 cl, 8 dwg, 12 ex
FIELD: process engineering.
SUBSTANCE: set of inventions relates to production of protection element and to retransfer film. Said retransfer film gas base layer with the first bearing film and one-layer or sandwich layer. First adhesive layer is applied on the first bearing film surface opposite the surface facing the decorative layer while second bearing film is applied so that first adhesive layer is located between first and second bearing films. First adhesive layer in activated in the first area that covers, at least partially, one first section of base film while first adhesive layer is not activated, nor created, created only partially or deactivated in second area adjacent to said area. Then, first bearing film is cut, at least partially, along boundary line defining at least first area and separating at least one first section from second area of base film. Second part of base film including second section is removed from second bearing film. Note here that base film is adhered, at least one in one first section to second bearing film by activated first adhesive layer. Note that said first part comprises at least one first section and stays at second bearing film.
EFFECT: better protection against counterfeit.
52 cl, 10 dwg
FIELD: physics, optics.
SUBSTANCE: invention relates to a film (1), designed to protect and decorate articles. The film includes at least one transparent replicating layer (2), having a diffracting relief structure (3) and a reflecting layer. The reflecting layer is formed from at least one layer (4) of pigmented lacquer, which is placed in the immediate vicinity of the diffracting relief structure (3). Refraction indices n1 of at least one lacquer layer (4) and n2 of the replicating layer (2) assume values whose difference is in the range from 0.05 to 0.7. Luminosity L* of at least one lacquer layer (4) is in the range from 0 to 90. Disclosed also is a method of producing said film and use thereof to coat car number plates and other articles to protect from forgery, coupled with an optically variable decorative effect.
EFFECT: improved properties of the film.
21 cl, 6 dwg
SUBSTANCE: invention relates to a thin-film element (30) having an interference layer structure for security papers, value documents and the like, having at least two semitransparent absorber layers (34, 38) and at least one dielectric spacing layer (36) arranged between the at least two absorber layers. According to the present invention, each of the two absorber layers (34, 38) consists of material having a complex refraction index N whose real part n and imaginary part k differ at least in a portion of the visible spectral range by a factor of 5 or more.
EFFECT: improved protection.
23 cl, 8 dwg
SUBSTANCE: disclosed is a multilayer polymer material with a raster structure, having a transparent polymer layer with a micro-raster relief structure in form of spherical lenses and a superimposed transparent polymer layer with printed raster. The layer with printed raster lies at a distance from the surface of the lens raster close to the focal distance of its lenses. The material is made with micro-image raster with resolution of 10-20 mcm. Regions are selected in the field of the printed raster, said regions forming latent images, inside of which the orientation of the raster grid differs from the orientation of the raster grid outside said regions by an angle ranging from 1 to 20 degrees. The latent images become visible upon superimposing the printed raster with the lens raster to form different visual effects.
EFFECT: improved security of articles.
FIELD: process engineering.
SUBSTANCE: set of inventions relates to security elements designed to protect documents, securities, polygraphic products etc, against counterfeit. Security element comprises outer transparent polymer base with transparent lacquer ply secured thereto and provided with micro relief with thin layers of reflecting and magnetic materials applied thereto. External transparent laminar ply is bonded to said layers with the help of adhesion layer. Depth of micro relief makes 0.01 mcm to 0.5 mcm. Micro relief represents a system of alternating magnetic strips. Security element cam additionally comprises transparent protective breakable ply. Sais security element can comprise two or more plies of magnetic material. Note here that latent info in every magnetic ply differs from latent info in other magnetic layers.
EFFECT: security element resistant to mechanical, chemical and thermal effects, reliable identification.
8 cl, 1 dwg
SUBSTANCE: invention relates to a protection element for bank notes, cards-passes, etc. The protection element comprises a first substrate which at least partly is opaque when viewed in transmitted light, and a plurality of magnetic zones placed on the said substrate, at that each of the said magnetic zones is formed using the first magnetic material, the second magnetic material or composition of the first and second magnetic materials which are at least partially superimposed. The first magnetic material and the second magnetic material exhibit different coercivity values which are determined by the sensor, at that the first and second magnetic materials are magnetically saturated, so that one of the first and second magnetic materials is not affected by the other.
EFFECT: protection element has a high ability to protect against counterfeiting.
25 cl, 10 dwg
FIELD: printing industry.
SUBSTANCE: multilayer protected composition is formed with an additional multilayer element. The element is formed on the paper surface. The element comprises a multi-colour coating in the form of periodic raster formed by at least two paints of different colours contrasting relative to the paper surface. The paints contain luminescent compounds having daily luminescence in the visible range of light under the influence of natural lighting. The combinations of paints are such that the integral colour of the additional multilayer protected element is visually perceived as unsaturated close to achromatic. One of the embodiments of the protected element forms graphic shape or is part of a graphic shape, which changes its visual display due to changing its colour grade and/or optical density and/or saturation when copying the document on a printing device operating in a colour system CMYK.
EFFECT: increased level of protection of paper or document from forgery by applying a new security feature.
12 cl, 8 dwg, 6 ex