Method of production of security paper, security paper and valuable document

FIELD: textiles, paper.

SUBSTANCE: method of production of security paper consists in adding to the paper pulp of protective markers on a carrier. The carrier is used as particles or a mixture of particles of a polymeric hydrogel. The maximum particle size of the hydrogel is up to 1000 microns.

EFFECT: improved protection of valuable documents.

21 cl, 5 ex

 

The invention relates to methods for protection of securities, in particular, to methods for producing protective compounds with special properties and the production of paper, protected from forgery. The paper is protected from a fake, used in the manufacture of valuable papers and documents requiring a high level of protection against forgery, such as banknotes, passports, driving licences and so on

There are various ways of introducing protective markers in the paper. Often protective markers embedded in the paper on certain media. This method of implementation allows to reduce the consumption of protective markers and to achieve different visual effects.

For example, from the patent DE 677711 known y when exposed to UV radiation melange fiber, which is introduced into a paper weight.

The known method of introducing markers directly in the fiber and textile yarn method of dyeing. The token in this case is the chelates of rare earth elements. Colorless in daylight fibrous strands begin to luminesce under UV-radiation, and the wavelength of the luminescence varies with temperature and is an important feature of a specific marker (patent US 5118349).

In the patent FR 2478695 (A1) described obtaining agglomerates protective pigment with acrylic with the Ola, the size of the agglomerates is 30-50 μm. In the patent RU 2402658 C1 proposed use to protect paper luminescent fibers and beads formed from polymeric materials containing complex polyester.

When using agglomerates of pigment particles preferably, the fine particles of the pigment have been chemically linked to each other using fully slivaushiesia binder. Known agglomerates, for example, firms Aussedat Rey S. A., which are formed in the liquid phase, and although these agglomerates present binder, this binder is not sewn in the process of drying paper on a paper machine (PM). These granules glomerida not chemically and physically, and it is impossible to control their size in the manufacturing process or to obtain in this way agglomerates containing several protective substances.

Media protective markers may have certain special properties: for example, from the patent FR 2970716 known way to obtain a secure paper, which consists in the introduction to the paper protective markers on the carrier which is insoluble in water but soluble in organic solvents. The particle size of the carrier thus preferably does not exceed 200 μm as a protective markers used intensely colored pigments with particle size less than 0 μm. Agglomeration of particles markers in this case preferably produced in derivatives, ethyl cellulose (pigments mixed with a small amount of polymer within a certain time).

In the patent EP 1074599 described different ways of obtaining protective of fluorescent particles in the form of a granulated mixture of water-insoluble dyes and/or pigments, luminescent under UV radiation, polysaccharides in the form of powder material (e.g., starch, cellulose and binder resin. When this fluorescent pigments and dyes are deposited on the surface of the granules of polysaccharides using a binder resin having two or more reactive groups which react with hydroxyl groups of polysaccharides.

Closest to the claimed technical solution proposed in the patent EP 226367, which describes the protected paper containing y particle size of 30-500 μm. In this case, particles markers are pigments size of 3-5 microns, chemically bonded to each other using a binder. Is used as a binder, for example, melamine-formaldehyde or acrylic resin, and as a cross-linking catalyst is ammonium chloride. Particles glomerida by adding a certain (small) amount of liquid binder Powder pigment or mixture of pigments mixed in a rotating drum, inside of which is installed stirrer rotating in the direction opposite to the rotation of the drum. Emulsion binder and catalyst is slowly added to the pigment powder. The granules increase in size as you add the emulsion. The process must be stopped before he formed too large granules. Then a binder is cured naturally or when heated to 105°C. the dry granules Obtained can be fractionated using sieves. With this method of obtaining the final particle size depends on the experience of the operator, the speed of adding the binder, the temperature of the binder, the chemical nature of the binder, and the solids content of the binder, the latter parameter can vary from batch to batch.

Disadvantages of using the above-mentioned media protective markers are often in the complexity of their production (the need for precise control of the process, depending on external factors, from the experience of the operator), the selectivity of the methods (e.g. methods, suitable for agglomeration of the pigments are not suitable for water-soluble protective markers) are often components for the production of media are unsafe from the point of view of impact on the human body and the environment.

Protected paper obtained in various ways, in t is m the number mentioned above, is used to obtain valuable document. Protected securities received by patents EP 1074599 and EP 226367, also inherent drawbacks related to the use of the above media protective markers.

The paper obtained by the present method, contains inclusions of size up to 1,000 microns, with at least one protective property. The protective properties of such paper can be determined visually under the influence of visible light and/or UV and/or IR region of the spectrum after exposure to chemical reagents, special developers, as well as various instrumental methods of analysis.

The technical result is to increase the degree of protection of valuable documents by introducing in their paper using a wide range of protective substances on a fundamentally new medium without impairing the quality of the paper and the document.

The technical objective of the proposed solutions is to provide a method of manufacturing a protective composition, simple to implement and allows to obtain particles of different sizes universal media, including large (up to 1000 μm) containing protective substances of different composition, as well as receipt paper containing this protective structure in the form such as particle size, with protective properties.

To solve this problem was developed with the brand new form of protection for the introduction of the paper. For solving the problem proposed objects and preferred embodiments of the invention are specified in dependent claims.

The term "hydrogel" in the present description is used in the traditional sense to refer to vodonapornyh polymer matrix, which can adsorb a significant amount of water with the formation of elastic deformable gels, where the matrix represent the three-dimensional polymer network of macromolecules held together by covalent or non-covalent crosslinks. Polymer grid act as a skeleton, voids which are filled with water. The polymer in the hydrogel may be partially or fully crosslinked (discrete or continuous). When placed in an aqueous environment hydrogels swell to the extent permitted by the degree of crosslinking. After removal of the hydrogel water (digitalizacie) remains porous matrix in the form of a polymer network. Thus, dried (dehydroretinal) hydrogel is a solid polymer. Swelling of hydrogels in water can be reversible and irreversible, depending on their chemical composition.

In a number of industries (medical, cosmetic, food and other industries) are widely used hydrogels, which represents a transverse cross-linked polymers based on various organic substances, it is the amount of the dispersion medium is water. Swelling in water of the polymer hydrogel can be various polymers such as cellulosic polymers, including composition cellulose ethers, polymers and copolymers of acrylic acid, methacrylic acid, vinyl polymers, polymers of ethylene glycol and others). The polymers can be crosslinked thermally, radiation, chemical curing or cross-linking agent.

In the composition of the hydrogels may be present, but not necessary, various additives (fillers, preservatives, pH regulators, thickeners, pigments, dyes, stabilizers, antioxidants, etc.). Data supplements and their number should be chosen in such a way that they do not have a significant impact on the desired chemical and physical properties of the hydrogel.

It should be noted that in this technical solution, preferably, the use of hydrogels based on acrylic polymers as components for the manufacture of such hydrogels are affordable, adaptable and secure. The use of acrylates and methacrylates provides a fairly simple course of polymerization, whereas, for example, in the case of some glycols require the addition of plasticizers, regulators and solvents. Acrylate hydrogels have a high degree of swelling (up to 1500%), which allows to reduce the consumption of components (including Chi is Les protective markers). In addition, hydrophilic hydrogels obtained from swelling in water of the polymer of acrylic acid or acrylate, typically do not have the stickiness that facilitates manipulation of the hydrogel to the process of grinding in the aquatic environment.

In the patent RU 2449331 described thermochromic device for adjustment of light level in which thermochromic layer is made of a thermochromic material, which represents a gel containing substances capable of forming gels, and complexes of transition metals. In this case, the use of the material in the form of a gel is preferable from the viewpoint of environmental and fire safety, and also allows you to improve specific properties of these devices.

Known methods for producing hydrogel for medical purposes (for example, patent RU 2067873), while the hydrogel is a transverse cross-linked polyacrylamide obtained with the use of methylene-bis-acrylamide as a cross-linking agent and a mixture of ammonium persulfate and tetramethylethylenediamine (TMED) as an initiator of radical polymerization; the concentration of polymer in the finished hydrogel is 3.5-9 wt.%.

Known application of polymeric hydrogels, considered as a porous matrix system, on the basis of copolymers of acrylamide in therapeutic purposes (patent RU 2198686).

Before bringing detailed OPI the project proposal must be clear, this invention is not limited to the above hydrogel carriers and modes of delivery on the basis of their protective materials or items for securities, which can vary widely applied for the first time as hydrogels and functional additives.

In the description and the formula of the present invention uses the following terminology for use as protective markers additives in the form of particles of known classes of substances in accordance with the definitions below.

Under the "phosphor" refers to a substance capable of converting the absorbed energy into light emission. As the phosphors are substances with fluorescent properties containing rare earth elements such as La, Ce, Pr, Nd, Sm, Eu, Sc, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y, Lu, or ions, Bi, Cd, Pb, Ni, Sn, Sb, W, Tl, Ag, Cu, Zn, Ti, Mn, Cr, V; as well as organic phosphors such as phosphors, classes of aromatic hydrocarbons and their substituted compounds with relationality and arylacetylenes groups, compounds with ekzoticheskoy C=N - group, five - and six-membered heterocyclic compounds, carbonyl-containing compounds derived naphthalenol acid, and any combination of these phosphors.

The term "indicator" refers to compounds that allow visuals is its chemical reaction, changes in the concentration of any substance, change in pH, and other parameters.

"Termohrom a substance that has thermochromism, ie, the ability to change color when the temperature changes. thermochromic holograms include, for example, moisture-containing compounds with complexes of transition metals, halides of alkaline and alkaline-earth metals, as well as lactones triphenylmethane dyes dissolved in alcohols, simple or complex esters or mixtures thereof, and zakopalova in polymer matrices, "Photochrom a substance that has photochromism, ie, the ability to reversibly change color under the action of visible light and/or UV radiation. Photochromism can be both physical and chemical. To chemical photochromism include such substances as chromenes, spiropyrans, spirooxazines, dithizonate, benzopyrane, phthalocyanines metals, crystals of alkali halides and alkaline-earth metals, activated by various additives, olefins, cyclic substituents, azo compounds, aryloxyphenoxy, salicylanilide and other

In the present method, the particles of the hydrogel as a protective marker contains at least one substance selected from the class:

UV and/or IR phosphors, soluble or water-insoluble, organic or inorganic origin and/or phosphors purchasing is uminescence or changing the color of the luminescence under UV or IR radiation when the temperature and/or substances, changes color when the temperature (thermochromic holograms) and/or substances that change color when exposed to visible and/or UV-light (photochrom) and/or connection of light or heavy elements and/or substances having the properties of indicators in relation to chemical reagents.

One of the variants of the proposed method obtain a secure paper and is used as a protective marker substances from the class of UV and/or IR phosphors, soluble or water-insoluble, organic or inorganic origin, whose concentration is from 0.01 to 3%.

For these materials, combined in one functional class, it is known that the luminescence of inorganic phosphors (phosphors) can be determined both by the properties of its base material (base) and the impurity - activators. The activator forms the basis of the luminescence centers. Activators are often listed above salts of rare earth elements, or elements, actinoid series (Y. P. Timofeev. Physical encyclopedia).

The organic luminescence phosphors (luminary, organoaluminium) due to the chemical structure of organic compounds and stored in different aggregate States. On chemical structure there are the following organic phosphors: aromatic hydrocarbons or their PR is spodnie Polyphenylene hydrocarbons, hydrocarbons with condensed aromatic nuclei or arelatively and arylacetylenes groups, five - and six-membered heterocycles and their derivatives, compounds with carbonyl groups; to organic phosphors also include complexes of metals with organic ligands (Krasovitsky B. M., Bolotin, B. M. Organic phosphors).

Most of the above series UV phosphors and IR phosphors are well known, and their use is mentioned, for example, in the patent RU 2388054.

One of the preferences of the proposed method obtain a secure paper and the paper itself is used as a protective marker substances from the class of thermostability phosphors, which use complex compounds with organic ligands and rare earth elements, mainly of terbium b and europium Eu.

As of thermostability phosphors used fluorescent ORGANOMETALLIC complexes containing mainly the terbium and/or other rare earth elements, salicylic acid and 1,10-phenanthrolin, the following formula TbxLn1-x(Sal)3-yPhenyand/or europium and/or other rare earth elements and compounds of the class of β-diketones and monobasic organic acid, the following formula EuxLn1-x(β-dic)2-y(R-COO)ythat SPO is obny to increase the intensity of luminescence under UV radiation when cooled below -5°C.

The concentration of thermostability phosphors acquiring the luminescence or changing the color of the luminescence under UV or IR radiation when the temperature is 0.2 to 4%.

One of the preferences of the proposed method of obtaining protective paper is used as a protective marker substances from the class of thermochromic holograms. In this case, using thermochromic substances, such as moisture-containing compounds are complexes of transition metals, halides of alkaline and alkaline-earth metals, as well as lactones triphenylmethane dyes dissolved in alcohols, simple or complex esters or mixtures thereof, and zakopalova in polymer matrices ("Chemistry and technology of pigments", E. F. white, I. C. Riskin).

The concentration of the substances that change color when the temperature of thermochromic holograms), is from 0.5 to 10%.

One of the preferences of the proposed method obtain a secure paper is used as a protective marker substances from the class of photochromes, which use substances with chemical photochromism, such as chromenes, spiropyrans, spirooxazines, dithizonate, benzopyrane, phthalocyanines metals, crystals of alkali halides and alkaline-earth metals, activated by various additives, ol the fins with cyclic substituents, azo compounds, aryloxyphenoxy, salicylanilide etc. are the concentration of the substances that change color when exposed to visible and/or UV-light (photochrome), is from 0.5 to 10%.

It is known that the chemical photochromism based on isomerization (usually CIS-TRANS isomerization), tautomeric transitions, breaks and formation of new chemical bonds, pericyclic intra - and intermolecular transformations; known mono - and bimolecular photochromic processes. Substances with thermochromism, described in detail in the literature, for example, "Photochromism and its application" buraczewski C. A., Dashkov, I., Chomsky C. A., "Organic photochrome", Ed. by A. C. Alcova).

One of the preferences of the proposed method obtain a secure paper is used as a protective marker compounds of light and heavy elements with atomic mass 23-230 (elements from Na to thorium Th periodic system of chemical elements of Mendeleev) with subsequent instrument control the elemental composition of the obtained protected securities.

The concentration of the compounds of light or heavy elements up to 10%.

One of the preferences of the proposed method obtain a secure paper and is used as a protective marker substances from the class of indicators of chemical reagents, quality is ve which dyes are used, soluble in polar organic solvents, such as acetone - soluble dyes, dyes, soluble in nonpolar organic solvents, such as fat-soluble azo dyes and girorastvorimie antrahinonovye dyes, acid-base indicators, chelatometric indicators, redox indicators (Indicators, Per. s angl., so 1 and 2 Denes I., Titration in non-aqueous media, Per. s angl., M., 1971; Korenman I. M.).

The concentration of the substances having the properties of indicators in relation to chemical agents is from 0.1 to 10%.

It is known the use of such substances to protect the paper from exposure to solvents (for example, patent RU 2242550).

Presented in the application on the classes of substances (and mixtures thereof) reflected in specific paragraphs of the invention are within the classes of functional analogues, the use of which is limited to an appropriate range of concentrations, which, in turn, used the other quantities stated in their paragraphs classes of substances.

The proposed method of manufacture of a protective composition includes the manufacture of hydrogel containing protective markers, and then the subsequent grinding of the hydrogel to obtain a volume of particles with a maximum size of up to 1000 m is m, preferably 30-350 μm. The preferred size range corresponds to the particle size at which the protective handles quite well visualized under appropriate conditions (for example, by exposure to UV radiation or in the processing of special reagents) and are guaranteed not to change mechanical and printing-technological properties of paper.

At the stage of grinding or after the hydrogel particles are mixed with water to prevent drying and grinding facilities. The obtained protective structure representing a suspension of hydrogel particles of the specified size, is introduced into a suspension of paper pulp.

The manufacturing process of the hydrogel simple to implement, does not require difficult and expensive materials, reagents and equipment not significantly depends on the skill of the operator. The concentration of polymer in the finished hydrogel is 5-25 wt.%, because the concentrations of the hydrogel is most suitable for mechanical grinding. The concentration of polymer in the hydrogel depends on the polymer used, as well as from the device where you will be grinding and particle size, which in subsequent hydrogel is crushed.

The size of the hydrogel particles is controlled parameter and depends on the conditions of crushed who I am. You can also further fractionation of the resulting particles, with the fine fraction may be re-used. Introducing paper hydrogel particles with different distribution in size, you can achieve different effects.

Swelling in water, the polymers do not dissolve in water within a pH of at least 7 to 9, which is determined by the conditions of production of paper.

The concentration of protective markers in the hydrogel vary within fairly wide limits and depends on the nature of the protective markers (for example, the concentration of the phosphor depends on the brightness of a luminescence, i.e., quantum yield), and their solubility in water, the particle size of the hydrogel (mostly true that the smaller the particle, the greater the required concentration protective marker), from the end view of the valuable document, the colors of printing inks on the finished product), on the sensitivity analysis methods (for example, when the elemental analysis mass spectrometry sensitivity to the elements much higher than with x-ray flourescence analysis). In the examples, the upper limit of concentrations protective of tokens corresponds to the values above which significant strengthening of the protective effect is not observed.

The use of hydrogels as carrier for protective substances which you can use as a protective water-soluble and water-insoluble substances the latter can be used in fine condition, precluding the possibility of their introduction in the paper in pure form due to the exhaustion of the paper web at the wet end of the paper machine.

The use of hydrogels allows you to get the protective elements of various sizes, including large (up to 1000 μm). However, even if a sufficiently large particle size of the hydrogel does not damage the paper-making equipment in the manufacture of paper due to their softness and plasticity. In the absence of the color particles of the hydrogel can not be seen visually in the finished paper in reflected rays and the light, and are not felt to the touch. Optionally, the hydrogel can be introduced white opaque pigment that gives hydrogel opacity.

The protective composition of the hydrogel particles may be embedded in paper in a variety of ways: in the paper a lot of different concentrations, in one of the layers or on predetermined areas of the molded sheet of paper. Protective markers in polymer matrices must be present in protected paper or valuable document in sufficient concentration to determine the protective properties of the paper and not exceeding the maximum allowable concentration that does not impair the properties of this protected securities or of this valuable document.

Polymer matrix fix the protective markers in the paper, thus forming a new object in the form of stocks of a particular stock with protective properties, and completely prevent their removal from the paper during its processing into valuable document.

During low tide and drying paper on a paper machine of the hydrogel particles are deformed (plushevaya in a press part of a paper machine) and moisture is removed, resulting hydrogel particles remain in the paper in the form of polymers. As a result, the area of the paper occupied by the hydrogel particle, at least not reduced, and the particles of the protective markers tightly held within the structure of the paper as cellulosic fibers and polymer nets. Methods for the determination of the protective properties of the obtained protected paper identifies specific protective markers introduced into the hydrogel.

It is also significant that the hydrogels are low-hazard substances 4 hazard class according to GOST 12.1.007, hydrogels fire, the explosion.

When increase a minimum of 10 times for particles larger than 100 μm, when using the appropriate detection methods can be seen that the hydrogel particles have an irregular shape. When considering the electron microscope with a magnification of about 500 times the hydrogel particles have a look ragged translucent particles of irregular shape.

Example 1

Receive valuable document containing his is the particle volume polymer network, remaining after drying the hydrogel particles, which represents a transverse cross-linked polyacrylamide obtained with the use of methylene-bis-acrylamide as a cross-linking agent and a mixture of ammonium persulfate and tetramethylethylenediamine (TMED) as an initiator of radical polymerization. As a protective marker particles of hydrogel containing water-insoluble organic phosphor of ARLOM 520 with UV luminescence greenish-yellow color.

Preparation of hydrogel: in a glass beaker with a capacity of 2 l was mixed with 130 g of acrylamide, 228 ml of 1% aqueous solution of methylene-bis-acrylamide and 22.8 ml of 1% aqueous solution of tetramethylethylenediamine. In the resulting solution was injected 0.7 g of a 20% suspension of the phosphor ORLOM 520. With stirring, was added to the resulting suspension of 200 ml of 1% aqueous solution of ammonium persulfate. The mixture was diluted to a final volume of 1440 ml. To accelerate polymerization of the glass mixture was heated to a temperature (35 to 60)°C. the Thus obtained hydrogel concentration transverse cross-linked polyacrylamide 9 wt.% and the concentration of the phosphor ORLOM 520 is 0.01%.

Thus obtained hydrogel with phosphor crushed in the aquatic environment, the ratio of the hydrogel and water was 1:3. Grinding was performed using a disperser with a "cutter" to the desired size is and particles and the nature of the distribution of particle size (median particle size: D 10=60 µm, D50=180 µm, D90=290 µm).

The resulting suspension of hydrogel was injected into a suspension of paper pulp in the amount of 3% by weight.with. the fiber. Suspension of hydrogel was applied to the main flow of paper pulp in the tank before the pressure box of the paper machine. After drying the paper on the drying part of the PM particles dehydrolinalool hydrogel represent matrix - plots polymer network.

Thus, the received protected paper containing matrix in the form of polymers in its scope.

The protective properties of the resulting paper are verified with device "Ultramag with a source of UV radiation (365±10) nm and 8 watts. The authenticity of the received protected securities evidenced by the presence of visually distinct luminescent points greenish-yellow color. Points have an irregular shape, not amenable to mechanical removal of paper.

When looking at the paper up to the light and reflected the rays of the particles of the polymer network cannot be detected visually.

Next, the resulting protected paper was sealed offset and metallographic printing methods. Obtained after sealing a valuable document that fully retains its protective properties.

Example 2

Receive secure paper containing particle volume polymer network remaining after drying the deposits of hydrogel, obtained by polymerization of dimethacrylate of polyethylene glycol. As a protective marker particles of hydrogel contains:

water - soluble optical Brightener Uvitex with UV luminescence in blue;

- thermostability UV phosphor purchasing when cooled UV luminescence of red and represents a water-insoluble compound of europium, dibenzoylmethane and propionic acid;

- water-insoluble acid-base indicator - pentameters red, purchasing in an acidic environment (pH less than 3) red color.

Preparation of hydrogel: in a glass beaker 250 g mixed 25 g of polyethylene glycol dimethacrylate, 0.33 g of peroxydisulfate ammonium, of 1.16 g of 3-mercapto-1,2-propane diol and 28 ml of 1% aqueous solution of tetramethylethylenediamine. In the resulting solution was successively introduced: 0.1 g of the optical Brightener, 2 g of a 10% suspension of termosaving UV phosphor and 0.1 g pentameters red. The mixture was diluted to a final volume of 100 ml To accelerate polymerization of the glass mixture was heated to a temperature (30 to 40)°C. the Thus obtained hydrogel concentration transverse cross-linked polymer and 25 wt.% and concentration of protective substances: Uvitex - 0,1%, thermostability the phosphor - 0,2%, pentameters red - 0,1%.

Thus obtained hydrogel is protective substances were crushed in the aquatic environment, the ratio of the hydrogel and water was 1:3. Grinding was performed using a laboratory disperser with a "cutter" to the desired particle size and distribution of particle size (median particle size: D10=60 µm, D50=185 μm, D90=300 μm). Then the suspension of hydrogel was fractionally on the sieve, highlighting the fraction with particle size less than 60 microns. Particle size less than 60 μm were set aside for re-used in the preparation of the hydrogel.

With the hydrogel particles larger than 60 μm was produced in the laboratory casting paper. Dosage particles of hydrogel thus amounted to 1.5% by weight.with. the fiber. For the preparation of castings used cotton pulp containing titanium dioxide in the amount of 4% by weight.with. fiber (to extinguish the self-luminescence paper).

After drying the paper in the drying device ostatniego apparatus of the hydrogel particles are matrix - plots polymer network.

Thus, the received protected paper containing matrix in the form of polymers in its scope.

Due to the large size (up to 320 μm), the absence of the fine fraction (particles less than 60 microns) and dark in the UV rays of the background paper, the particles of polymer mesh easily visualized under UV radiation (have blue Lumi is ascencio). When cooled to -49°With particles of a polymeric mesh reversible change color luminescence from blue to red.

In daylight particles are not detected in the paper up to the light or the reflected rays.

When processing paper acid, polymer particles mesh painted in red color.

Example 3

Receive secure paper, containing in its volume of a mixture of particles of polymers with different properties.

In this case, was the mixture of hydrogels with different protective markers. Hydrogels represent transverse cross-linked polyacrylamide obtained with the use of methylene-bis-acrylamide as a cross-linking agent and a mixture of ammonium persulfate and tetramethylethylenediamine (TMED) as an initiator of radical polymerization. As a protective marker particles of hydrogel 1 contains:

- thermochromic pigment Termochromical Material TM-PD M10-3131, reversibly changes its color from white to blue when cooled to - 10°C;

- photochromic pigment Chameleon UVC P-Yellow (polychrome), in the visible light reversibly changes its color from white to yellow after UV exposure.

oxide of strontium.

Particles of hydrogel 2 as a protective marker contain water-insoluble organic phosphor of ARLOM 560 with UV luminescence orange color.

Preparation of hydrogel 1: in a glass beaker 250 what l was mixed with 50 g of 45% aqueous solution of polyvinylpyrrolidone 6 ml of 40% aqueous solution of polyurethane, 34 g of a 30% suspension of fotochrome, 1.8 g of a 30% suspension of termohrom, 10.3 g of strontium oxide and 2 g of kaolin brand KP-87 to give the hydrogel whiteness and opacity. With stirring, was added to the resulting suspension of 0.25 g of chitosan.

Thus, the obtained hydrogel concentration transverse cross-linked polymer 22 wt.%, the concentration of kaolin 2% and the concentration of protective substances: termohrom - 0.5%, photochrom - 10%, the oxide of strontium - 10%.

Preparation of hydrogel 2: in a glass beaker of 1 liter was mixed with 58 g of acrylamide, 102 ml of 1% aqueous solution of methylene-bis-acrylamide and 10.2 ml of 1% aqueous solution of tetramethylethylenediamine. In the resulting solution was injected 144 g of a 10% suspension of the phosphor ORLOM 560.

With stirring, was added to the resulting suspension 89 ml of 1% aqueous solution of ammonium persulfate. The mixture was diluted to a final volume of 480 ml For accelerating polymerization of the glass mixture was heated to a temperature (35 to 60)°C. the Thus obtained hydrogel concentration transverse cross-linked polyacrylamide 12 wt.% and the concentration of Gluma 560 - 3%.

The resulting hydrogels with protective substances separately crushed in the aquatic environment, the ratio of the hydrogel and water was 1:3. Grinding was performed using laboratory dispergator is and with a "cutter" to the desired particle size and distribution of particle size (for hydrogel 1 median particle size: D 10=80 ám, D50=440 μm, D90=900 microns; for hydrogel 2: D10=8 μm, D50=90 mm, D90=190 μm).

Suspensions of particles hydrogels were mixed in the following ratio hydrogel 1 : hydrogel 2=2:1.

With the obtained mixed suspension was made laboratory casting paper. The total dosage of the particles of the hydrogel thus amounted to 1.5% by weight.with. the fiber.

After drying the paper in the drying device ostatniego apparatus of the hydrogel particles are matrix - plots polymer network.

Thus, the received protected paper containing matrix in the form of polymers in its scope.

When examining the received paper in the UV rays of the visible particles of polymer mesh left over from the hydrogel 2, the particles have an orange luminescence, particle size less than 200 microns.

When cooled to -10°C the particles of the polymer network, the remaining hydrogel 1, reversible acquire a blue color.

After keeping the resulting paper under a source of ultraviolet radiation with a wavelength of 365 nm for 1 minute particles of polymer network hydrogel 1 reversible acquire a yellow color in visible light.

When the elemental analysis of the sample obtained paper that contains at least one particle - matrix polymer network hydrogel 1, using x-ray fluorescence spectrometer is Focus-M2" in the paper is detected by the element strontium.

Despite the large size (up to 1000 microns) particles of the polymer network is not detected in the paper up to the light or the reflected rays.

Example 4

Receive valuable document with locally placed elements of protection on the basis of a mixture of polymers hydrogels, which represents a transverse cross-linked polyacrylamide with protective handles.

As a protective marker particles of hydrogel 1 contains:

- fat-soluble pigment red-orange fluorescent Solvent Orange GG, acquiring after exposure to nonpolar organic solvents luminescence orange;

oxide of osmium.

As a protective marker particles of hydrogel 2 contains:

- thermostability UV phosphor purchasing when cooled UV luminescence of green and represents a water-insoluble compound of terbium, salicylic acid and 1,10-phenanthroline.

Preparation of hydrogel 1: in a glass beaker with a capacity of 2 l was mixed with 72 g of acrylamide, 127 ml of 1% aqueous solution of methylene-bis-acrylamide and 12.7 ml of 1% aqueous solution of tetramethylethylenediamine. In the resulting solution was injected 576 g of a 25% suspension of fat-soluble pigment and 0.015 g of osmium oxide, and 288 ml of 10% suspension of titanium dioxide to make the hydrogel whiteness and opacity (to compensate for the yellow coloring from W is nerastvorim pigment).

With stirring, was added to the resulting suspension 111 ml of 1% aqueous solution of ammonium persulfate. The mixture was diluted to a final volume of 1440 ml. To accelerate polymerization of the glass mixture was heated to a temperature (45 to 60)°C. the Thus obtained hydrogel concentration transverse cross-linked polyacrylamide 5 wt.%, the concentration of titanium dioxide 2% and the concentration of protective substances: fat-soluble pigment - 10%, osmium oxide is 0.001%.

Preparation of hydrogel 2: in a glass beaker with a capacity of 2 l was mixed with 150 g of acrylamide, 264 ml of 1% aqueous solution of methylene-bis-acrylamide and 26.4 ml of 1% aqueous solution of tetramethylethylenediamine. In the resulting solution was introduced 400 g of a 10% paste termosaving UV phosphor.

With stirring, was added to the resulting suspension 230 ml of 1% aqueous solution of ammonium persulfate. The mixture was diluted to a final volume of 1000 ml To accelerate polymerization of the glass mixture was heated to a temperature (35 to 60)°C. the Thus obtained hydrogel concentration transverse cross-linked polyacrylamide 15 wt.% and the concentration of termosaving UV-phosphor - 4%.

The resulting hydrogels with protective substances separately crushed in the aquatic environment, the ratio of the hydrogel and water was 1:3. Grinding was performed using a disperser with the function of the mill" to the desired particle size and distribution of particle size (for hydrogel 1 median particle size: D 10=80 ám, D50=350 mm, D90=600 μm; for hydrogel 2: D10=15 μm, D50=100 μm, D90=190 µm;).

Suspensions of particles hydrogels were mixed in the following ratio hydrogel 1 : hydrogel 2=1:1.

The obtained mixed slurry of the hydrogels was mixed with paper pulp concentration of fiber 0.2% and was introduced in the paper locally, in areas of wet paper web, using devices for zonal (band) introduction established in the zone of low tide kruglosutochno PM.

After drying the paper in the dryer section of a paper machine of the hydrogel particles are matrix - plots polymer network.

Thus, the received protected paper containing sections width (20±2) mm with particles of a polymeric mesh, nastoyka paper pulp with particles of the polymer network when it has a thickness of about 20 μm. The flow of the mixture of hydrogels for the manufacture of 1 ton of this protected paper in this case amounted to 0.2% of A. with. the fiber.

The particles of the polymer network in the received protected paper not detected paper up to the light or the reflected rays, as well as under UV radiation.

The protective properties of the resulting paper are verified with device "Ultramag with a source of UV radiation (365±10) nm and 8 watts. When cooled protected paper to 49°C on a secure site see reversible appearance of t is check with luminescent green. When processing the protected area non-polar organic solvents such as white spirit) see the irreversible emergence of large particles of irregular shape with orange luminescence

When the elemental analysis of the protected areas received paper using x-ray fluorescence spectrometer "Focus-M2" in the paper is detected by the element osmium.

Despite the large size (up to 600 microns) particles of the polymer network is not detected in the paper up to the light or the reflected rays.

Next, the resulting protected paper was sealed offset and metallographic printing methods. Obtained after sealing a valuable document that fully retains its protective properties.

Example 5

Receive secure paper containing particle volume polymer network remaining after drying the hydrogel, obtained on the basis of polyvinylpyrrolidone. As a protective marker particles of hydrogel contains:

- inorganic thermochromic pigment is a compound of Nickel chloride with hexamethylenetetramine and crystalline water. Pigment reversibly changes color from light green to yellow when heated to 60°C;

- photochromic pigment Chameleon UVC P-Violet (polychrome), in the visible light reversibly changes its color from white to purple after UV exposure.

Preparation of Hydra the gel: in a glass beaker with a capacity of 250 g was mixed with 50 ml of 25% aqueous solution of polyvinylpyrrolidone and 2.5 g of a block copolymer of ethylene glycol and propylene glycol. In the resulting solution was added 28.5 g of 35% suspension of termohrom 1.4 g of 35% suspension of photochrome. With stirring, was added to the resulting suspension 18 ml of 4.5% neutralized chitosan. The mixture is gently stirred until the start of gelling.

Thus, the obtained hydrogel concentration transverse cross-linked polymer 9 wt.% and concentration of protective substances: termohrom - 10%, photochrom - 0,5%.

Thus obtained hydrogel with protective substances were crushed in the aquatic environment, the ratio of the hydrogel and water was 1:3. Grinding was performed using a laboratory disperser with a "cutter" to the desired particle size and distribution of particle size (median particle size: D10=30 µm, D50=155 μm, D90=274 µm).

With the obtained suspension of particles of hydrogel was fabricated laboratory casting paper. Dosage particles of hydrogel in this case amounted to 3% by weight.with. the fiber. Thus, received a paper containing particles of a polymer network in its scope.

In daylight the particles of the polymer network in the paper are visible as turn on a light green color. By heating the paper to 60°C particles reversible become yellow in color.

After keeping the resulting paper under a source of ultraviolet radiation with a wavelength of 365 nm for 1 minute particles is polimernoi mesh reversible acquire a violet-blue color in visible light.

1. A method of manufacturing a protected paper, which consists in the introduction to pulp protective markers on the carrier, characterized in that as media use particles or a mixture of particles of polymer hydrogel, the maximum particle size of the hydrogel is up to 1000 microns.

2. The method according to p. 1, characterized in that in the process of making paper hydrogel particles lose water and in the finished paper represent a matrix in the form of polymer nets distributed in protective markers.

3. The method according to p. 2, characterized in that predominantly use hydrogel particles ranging in size from 30 to 350 μm.

4. The method according to p. 2, characterized in that the polymer hydrogel is used hydrogels based on cellulose derivatives or polyurethane or vinyl polymers, mainly on the basis of acrylate polymers, the concentration of the polymer in the form of cross-crosslinked polymer network in the hydrogel ranges from 5 to 25 wt.%.

5. The method according to p. 4, characterized in that the particles of the hydrogel as a protective marker contains at least one substance selected from the class: UV and/or IR phosphors, soluble or water-insoluble, organic or inorganic origin and/or phosphors, acquiring the luminescence or changing the color of the luminescence under impacts the quality UV or IR radiation when the temperature and/or substances, changes color when the temperature (thermochromic holograms) and/or substances that change color when exposed to visible and/or UV-light (photochrom) and/or connection of light or heavy elements and/or substances having the properties of indicators in relation to chemical reagents.

6. The method according to p. 5, characterized in that the concentration of UV and/or IR phosphors, soluble or water-insoluble, organic or inorganic origin is from 0.01 to 3%.

7. The method according to p. 5, characterized in that the concentration of the phosphors, acquiring the luminescence or changing the color of the luminescence under UV or IR radiation when the temperature of thermostability phosphors) is 0.2 to 4%.

8. The method according to p. 5, characterized in that the concentration of a substance that changes color when the temperature of thermochromic holograms), is from 0.5 to 10%.

9. The method according to p. 5, characterized in that the concentration of a substance that changes color when exposed to visible and/or UV-light (photochrome), is from 0.5 to 10%.

10. The method according to p. 5, characterized in that the concentration of the compounds of light or heavy elements up to 10%.

11. The method according to p. 5, characterized in that the concentration of substances with properties of indicators in relation to chemical agents is from 0.1 to 10%.

12. The method according to p. 6, otlichayushiesya, as phosphors used substances with fluorescent properties containing rare earth elements such as La, Ce, Pr, Nd, Sm, Eu, Sc, Gd, Tb, Dy, Ho, Er, Tm, Yb, Y, Lu, or ions, Bi, Cd, Pb, Ni, Sn, Sb, W, Tl, Ag, Cu, Zn, Ti, Mn, Cr, V, as well as organic phosphors such as phosphors, classes of aromatic hydrocarbons and their substituted compounds with relationality and arylacetylenes groups, compounds with ekzoticheskoy C=N - group, five - and six-membered heterocyclic compounds, carbonyl-containing compounds derived naphthalenol acid, and any combination of these phosphors.

13. The method according to p. 7, characterized in that the quality of thermostability phosphors use complex compounds with organic ligands and rare earth elements, mainly of terbium Tb and europium Eu.

14. The method according to p. 8, characterized in that thermochromic holograms using thermochromic substances, such as moisture-containing compounds with complexes of transition metals, halides of alkali and alkaline earth metals, as well as lactones triphenylmethane dyes dissolved in alcohols, simple or complex esters or mixtures thereof and zakopalova in polymer matrices.

15. The method according to p. 9, characterized in that as photochromes the use of substances with chemicalcomposition, such as chromenes, spiropyrans, spirooxazines, dithizonate, benzopyrane, phthalocyanines metals, crystals of alkali halides and alkaline earth metals, activated by various additives, olefins, cyclic substituents, azo compounds, aryloxyphenoxy, salicylanilide and other

16. The method according to p. 10, characterized in that compounds of light and heavy elements using combinations of chemical elements with atomic mass 23-230 (elements from Na to thorium Th periodic system of chemical elements of Mendeleev) with subsequent instrument control the elemental composition of the obtained protected securities.

17. The method according to p. 11, characterized in that the indicators on the chemical reagents used dyes, soluble in polar organic solvents, such as acetone - soluble dyes, dyes, soluble in nonpolar organic solvents, such as fat-soluble azo dyes and girorastvorimie antrahinonovye dyes, acid-base indicators, chelatometric indicators, redox indicators.

18. The method according to p. 13, characterized in that the quality of thermostability phosphors used fluorescent ORGANOMETALLIC complexes containing mainly the terbium and/or other rare earth element is s, salicylic acid and 1,10-phenanthrolin, the following formula: TbxLn1-x(Sal)3-yPhenyand/or europium and/or other rare earth elements and compounds of the class of β-diketones and monobasic organic acid, the following formula EuxLn1-x(β-dic)2-y(R-COO)ythat can increase the intensity of luminescence under UV radiation when cooled below -5°C.

19. Protected paper, made by PP.1-18 containing matrix digitalsound particles of hydrogel in the form of polymer nets distributed in protective markers.

20. Secure the paper by p. 19, characterized in that the matrix with protective markers distributed throughout the volume of paper, a given layer and/or a specific piece of paper.

21. Valuable document, crafted from protected paper, received in one of the paragraphs.19 or 20.



 

Same patents:

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

FIELD: printing.

SUBSTANCE: invention relates to the field of protection of valuable documents against forgery. The valuable document comprises on its surface an invisible protective marking applied on the elongated section along the long side of the document, which is intended for the instrument reading. The protective marking has the property of selective absorption of the radiation in the range optical spectrum from 0.76 mcm to 10 mcm. The marking is wholly or partially located in the area of additional masking marking. The material of the latter has the property of re-radiation when exposed of the exciting radiation of the same spectral composition as the material of the protective marking, but is characterised with magnitude of afterglow time. The method of determining the authenticity of the valuable document comprises revealing the hidden security marking on the valuable document. The revealing of marking is carried out by registration of afterglow of its material after removal of the exciting radiation and/or by registration of the diffuse reflection of the material in the optical range of wavelengths from 0.76 mcm to 10 mcm. Violation of the predetermined information indicates full or partial forgery.

EFFECT: increase in the level of protection of the valuable document against forgery.

13 cl, 4 ex

FIELD: physics.

SUBSTANCE: method of inspecting paper with optical protective marks on banknote threads involves synthesis of a flat optical element with an asymmetric microrelief. An asymmetric image is formed in an optical element to allow automatic inspection, invariant to the shift of the banknote and turning thereof within 10 degrees when the protective mark is illuminated with a laser beam perpendicular to the plane of the banknote. The image is in form of bright sections, parallel to the direction of movement of the banknote in the channel of a counting and sorting device, lying in the focal plane, parallel to the plane of the banknote, or in planes Q1 and Q2, each inclined to the plane of the banknote by an angle α, which is less than 60 degrees. The line of intersection of planes Q1 and Q2 is parallel to the direction of movement of the banknote. The control feature for identification is the distance from each of the sections to the laser beam. The apparatus for inspecting paper with optical protective marks on banknote threads includes a diode laser, a detection system, an electronic unit for recording information from a line of photodiodes and an electronic unit which performs automatic inspection. The diode layer emits a laser beam perpendicular to the plane of the banknote.

EFFECT: high protection of optical marks from forgery, high reliability of identification and invariance of the inspection procedure at high speeds of the banknote in the channel of a counting and sorting machine.

3 cl, 16 dwg

FIELD: textile, paper.

SUBSTANCE: sandwich product protected against forgery includes sheets of paper with protective elements, which are saturated with a polymer binding agent, and external polymer layers. Sheets of paper are saturated in molten thermoreactive or thermoplastic polymer throughout the volume and surfaces of each sheet are coated with a polymer layer; besides, the product surfaces are of a relief type. A manufacturing method involves saturation of sheets of paper with protective elements with the molten thermoreactive or thermoplastic polymer, or with their mixtures, drying with partial polymerisation, assembly of a pack of saturated sheets, hot pressing lamination with simultaneous formation of surface relief and products of the specified geometrical shape.

EFFECT: producing substitutes of currency notes based on sandwich plastic materials containing protective elements and having high indices of stability to aggressive action and mechanical wear during operation.

8 cl, 2 ex

FIELD: information technology.

SUBSTANCE: graphic elements are deposited using printing techniques on one or both sides of the medium, wherein mutual arrangement thereof is such that said elements form an image having an optically variable effect. The graphic elements are deposited by scratch-off printing while meeting the following conditions: engraving groove depth should not exceed 14 mcm and the width of the graphic elements should be of the order of the thickness of the data medium. The obtained data medium retains its flatness. The thickness of the paint layer is in the range of 3 to 10 mcm.

EFFECT: high degree of protection of articles while obtaining a novel optically variable effect or movement effect, high manufacturability and low cost of the protective element.

8 cl, 10 dwg, 2 ex

FIELD: textiles, paper.

SUBSTANCE: method of papermaking with multi-tone watermark lies in the use for casting and moulding of the paper web on a papermaking machine of the relief mask representing a partially water-permeable moulding element. The element is formed on the surface of the cylinder forming fabric, or on the dandy roll of the fourdrinier former. The mask has a variable height of the image area of the watermark, created by the relief stamping of the fabric, with electrotype and/or conjoint stamping of the fabric and electrotype and/or use of several layers of the electrotype. Individual, successive layers of electrotype in the mask can have openings which are different in the diameter and the density of location. The mask is assembled out of several layers of perforated plates of metal or plastic plates or composite materials. The paper and printing product made by the above method is claimed, which are protected against forgery.

EFFECT: expansion of technological capabilities of the method of production in the paper of the watermark with the increase in the capacity of the watermark as an element of protection against forgery.

7 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to making of protective element having substrate with at least one opening covered on one side by translucent film. Said film is applied over solid translucent coat on the substrate top and bottom sides. Note here that coat forming material is applied in large amount in zone of said opening or said opening is filled with filler completely prior to coat application.

EFFECT: ruled out fouling nearby opening edges, stability of protective element at flexure.

7 cl, 4 dwg

Covered document // 2439235

FIELD: textiles, paper.

SUBSTANCE: covered document contains a substrate, visible authenticating element, as well as a control area which boundaries are at least partially defined by the authenticating element, and the authenticating element, at least partially restricts the contour of the control area and/or is used for positioning the control area. The control area has many identifying elements that differ from the specified authenticating element, and the control area carries the identifying information displaying at least one feature of identifying elements, in particular spatial or physical feature. Identification information is associated with the feature of the control area, in particular spatial and/or physical feature, at that the said information relates to one spatial and/or physical feature of identifying elements. Identifying elements are randomly dispersed within the control area and/or made for emission of a particular signal at the external, in particular optoelectronic, electromagnetic, electrical, magnetic, thermal or acoustic influence.

EFFECT: increased degree of protection of documents against forgery and counterfeiting, improvement of identification while automatic reading of documents.

59 cl, 18 dwg, 5 ex

FIELD: textiles, paper.

SUBSTANCE: method of wet manufacturing a fibrous layer on a forming fabric of a paper machine, having a pile of fabrics. Wherein the said pile of fabrics includes superimposed front fabric and at least one subfabric, and the fibrous layer contains at least one element of an assigned thickness. At that the method includes a stage of forming the said layer by pulp dewatering on the forming fabric, which pile of fabrics has an area of low dehydration, compared to the first subfabric, at a level of at least one subfabric and/or under the front fabric. And the area of low dehydration meets the location of the said element. The group of inventions also relates to a forming fabric, to a method for its manufacture, to a protective sheet obtained in the above manner, and to covered document obtained from the protected sheet.

EFFECT: obtaining the fibrous layer with protective elements with lack of apparent thickening on its surface.

54 cl, 8 dwg

FIELD: textile, paper.

SUBSTANCE: invention relates to a flat protective element of comparatively small size, for instance, to a pad, and also to a material that contains such elements, to secured documents made from such material, and to the method of manufacturing of these elements. The specified protective element comprises at least one through hole.

EFFECT: higher extent of documents counterfeit protection, and also provision of a stronger attachment of protective elements to the substrate.

26 cl, 5 dwg, 2 ex

FIELD: physics.

SUBSTANCE: laminated structure includes a layer containing a thermoplastic polymer and a layer containing a thermoplastic polymer and a black pigment as a laser radiation sensitive additive. The layer containing a thermoplastic polymer is free of laser radiation sensitive additives and the layer containing a thermoplastic polymer and a black pigment as a laser radiation sensitive additive has a thickness of 5-30 mcm and contains 40-180 ppm of the black pigment.

EFFECT: font information or an image, the definition and resolution of which are better compared to existing systems, can be incorporated into the disclosed laminated structure by laser engraving without deterioration of visual colour effect caused by intense grey colouring of the base material.

13 cl, 4 dwg, 1 tbl, 23 ex

FIELD: printing.

SUBSTANCE: in application security element is described, for information media, having a translucent base which has a first separate part with the first paint layer and a second separate part with a second paint layer different from the first paint layer. When viewed in reflected light the first and second separate parts form a continuous common site and create mainly equal visual appearance, and when viewed in transmitted light the first separate part creates the visual impression that is lighter compared to the visual impression created by the second separate part.

EFFECT: proposed security element has ease of manufacture and ease of its identification.

18 cl, 7 dwg

FIELD: measurement technology.

SUBSTANCE: polymeric film authentification method includes the stage, when the birefringence of the layer inside this film is measured, the birefringence value obtained at the measurement stage is compared with the preset birefringence value indicating the film recognised as authentic, to determine, whether the specified film is authentic or not, on the basis of the named comparison.

EFFECT: possibility of film protection without making any changes in it.

20 cl, 5 dwg

FIELD: printing.

SUBSTANCE: security feature is proposed to protect valuable documents against forgery, having a plurality of microcapsules each of which has a wall and each of which contains a liquid medium in which several magnetic particles are distributed, which are arranged movably in the liquid medium with the ability to change their position inside the microcapsule by influencing with the magnetic field and which are made with the ability of their ordering in the microcapsule to form a diffraction regular structure by them.

EFFECT: proposed invention increases the degree of protection of the document against forgery.

15 cl, 5 dwg

FIELD: physics.

SUBSTANCE: invention relates to a security element having the following layers: a) a substrate, b) a first lacquer layer having a diffraction-optically active structure containing a hologram, a surface relief, a diffraction structure, a diffraction grating or kinegram, c) a second lacquer layer, e) an adhesive coating. In case of an attempt at tempering with the security element, the first lacquer layer (b) separates from the second lacquer layer (c) and the optically active structure entering the first lacquer layer (b) in both the separated first lacquer layer and the second lacquer layer remaining on the protected object becomes visible as a negative.

EFFECT: disclosed security element provides unambiguous determination of tempering with the security element.

14 cl

FIELD: physics.

SUBSTANCE: security element for identification of articles relates to counterfeit protection and authentication of securities, which can be used for concealed marking of various objects in order to prevent unauthorised production of said objects and simplify authentication thereof. The security element comprises a stack of polymer layers glued to each other, each having a certain type of semiconductor quantum rods which luminesce in different spectral regions and are oriented in directions orthogonal to each other.

EFFECT: high reliability of the security element and longer service life thereof.

4 dwg

FIELD: physics.

SUBSTANCE: protected document contains an opaque substrate, optical wave guide located on the substrate and/or in it and a coupler for light conducting into or out of the wave guide. Meanwhile the coupler has a hole passing through a wave guide and through the whole opaque substrate.

EFFECT: enhanced protection against document forgery.

15 cl, 9 dwg

FIELD: physics.

SUBSTANCE: invention relates to the method and line for fabrication of insert for a multilayer film, to the multilayer film itself, in particular to the inserts for further comprising into the smart card, where the film substrate with several electronic devices placed on it and conjugated with each other is fed to the image reader, which allows to obtain a position of an electronic device, as separate object. Meanwhile the laser sensitive levelling film is applied on the film substrate, at first is fed to the device for laser cutting, and the data on the position of the respective electronic devices on the film substrate obtained by the image reader, is transmitted into the device for laser cutting and this device is controlled for making the cut-outs aligned with the positions of electronic elements. The levelling film with cut-outs, and the film substrate in assembly section are connected and, with precise matching having aligned with reference to each other are fixed, forming an insert. Meanwhile, using the laser cutting device for making of cut-outs, and using one more laser cutting device or the marking device for each object or the group of objects on the levelling film a mounting mark is applied depending on the obtained position of the electronic device on the film substrate.

EFFECT: method improvement.

17 cl, 2 dwg

FIELD: printing.

SUBSTANCE: invention relates to the field of protective elements for valuable documents or security documents. The method of manufacturing the protective element for a security document and the protective element comprises a substrate defining the first and second opposite sides, and in the substrate a translucent area is formed by applying material which increases the transparency of the substrate, and for forming the said translucent area the method comprises the following steps: the first step - applying the material for obtaining the impermeable substrate in the first area of the first side, and the first area surrounds the second area of the first side which does not comprise the said material creating impermeability, at that the material creating impenetrability prevents impregnating of the substrate in the first area by the material increasing the transparency. The second step - the application of the material increasing the transparency on at least the second area so that to impregnate the substrate and to make it transparent in this area, and the first area and the second area form the first pattern and the second pattern, respectively, which form an image that is viewed from two sides of the substrate.

EFFECT: invention provides creation of the simple and inexpensive protective element that ensures high degree of protection against forgery.

17 cl, 17 dwg

FIELD: physics.

SUBSTANCE: article comprises a carrier and a multilayer security element having a latent image. The security element is invisible when the document is viewed at a right angle, but becomes visible when the viewing angle is changed. The latent image is in the form of two identical graphic elements of different colours, which are formed by mutual displacement of portions of three-dimensional raster and raster of a multi-colour coating by a distance which is a multiple of half the period of the raster, and which are located in the same plane. The elements are located at a distance which enables observation of a stereoscopic image thereof using anaglyph glasses and/or colour filters.

EFFECT: high security of a valuable document.

15 cl, 7 dwg

FIELD: textiles, paper.

SUBSTANCE: method of production of security paper consists in adding to the paper pulp of protective markers on a carrier. The carrier is used as particles or a mixture of particles of a polymeric hydrogel. The maximum particle size of the hydrogel is up to 1000 microns.

EFFECT: improved protection of valuable documents.

21 cl, 5 ex

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